1
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Lin C, Ahn JK, Choi JM, Farrington MS, Gonzalez M, Grethen N, Hsiung YB, Inagaki T, Kamiji I, Kim EJ, Kim JL, Kim HM, Kawata K, Kitagawa A, Komatsubara TK, Kotera K, Lee SK, Lee JW, Lim GY, Luo Y, Matsumura T, Nakagiri K, Nanjo H, Nomura T, Ono K, Redeker JC, Sato T, Sasse V, Shibata T, Shimizu N, Shinkawa T, Shinohara S, Shiomi K, Shiraishi R, Suzuki S, Tajima Y, Tung YC, Wah YW, Watanabe H, Wu T, Yamanaka T, Yoshida HY. Search for the Pair Production of Dark Particles X with K_{L}^{0}→XX, X→γγ. Phys Rev Lett 2023; 130:111801. [PMID: 37001070 DOI: 10.1103/physrevlett.130.111801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 02/08/2023] [Indexed: 06/19/2023]
Abstract
We present the first search for the pair production of dark particles X via K_{L}^{0}→XX with X decaying into two photons using the data collected by the KOTO experiment. No signal was observed in the mass range of 40-110 MeV/c^{2} and 210-240 MeV/c^{2}. This sets upper limits on the branching fractions as B(K_{L}^{0}→XX)<(1-4)×10^{-7} and B(K_{L}^{0}→XX)<(1-2)×10^{-6} at the 90% confidence level for the two mass regions, respectively.
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Affiliation(s)
- C Lin
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - J M Choi
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - M S Farrington
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - M Gonzalez
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Grethen
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y B Hsiung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - T Inagaki
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - I Kamiji
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - E J Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J L Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - H M Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - K Kawata
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - A Kitagawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T K Komatsubara
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Kotera
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S K Lee
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J W Lee
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - G Y Lim
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - Y Luo
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Matsumura
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - K Nakagiri
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nanjo
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Nomura
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Ono
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - J C Redeker
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Sato
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - V Sasse
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Shibata
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Shimizu
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Shinkawa
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - S Shinohara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Shiomi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - R Shiraishi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Suzuki
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - Y Tajima
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - Y-C Tung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Y W Wah
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - H Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - T Wu
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - T Yamanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Y Yoshida
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
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2
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Abe S, Asami S, Eizuka M, Futagi S, Gando A, Gando Y, Gima T, Goto A, Hachiya T, Hata K, Hayashida S, Hosokawa K, Ichimura K, Ieki S, Ikeda H, Inoue K, Ishidoshiro K, Kamei Y, Kawada N, Kishimoto Y, Koga M, Kurasawa M, Maemura N, Mitsui T, Miyake H, Nakahata T, Nakamura K, Nakamura K, Nakamura R, Ozaki H, Sakai T, Sambonsugi H, Shimizu I, Shirai J, Shiraishi K, Suzuki A, Suzuki Y, Takeuchi A, Tamae K, Ueshima K, Watanabe H, Yoshida Y, Obara S, Ichikawa AK, Chernyak D, Kozlov A, Nakamura KZ, Yoshida S, Takemoto Y, Umehara S, Fushimi K, Kotera K, Urano Y, Berger BE, Fujikawa BK, Learned JG, Maricic J, Axani SN, Smolsky J, Fu Z, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Dell'Oro S, O'Donnell T, Detwiler JA, Enomoto S, Decowski MP, Grant C, Li A, Song H. Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen. Phys Rev Lett 2023; 130:051801. [PMID: 36800472 DOI: 10.1103/physrevlett.130.051801] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/10/2022] [Accepted: 11/29/2022] [Indexed: 06/18/2023]
Abstract
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in ^{136}Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of ^{136}Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the 0νββ decay half-life of T_{1/2}^{0ν}>2.3×10^{26} yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations.
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Affiliation(s)
- S Abe
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Asami
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - M Eizuka
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Futagi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Gima
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Goto
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Hachiya
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Hata
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Hayashida
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Hosokawa
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Ichimura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Ieki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ikeda
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Inoue
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - K Ishidoshiro
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Kamei
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - N Kawada
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Kishimoto
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - M Koga
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - M Kurasawa
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - N Maemura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Mitsui
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Miyake
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Nakahata
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - R Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ozaki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Graduate Program on Physics for the Universe, Tohoku University, Sendai 980-8578, Japan
| | - T Sakai
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Sambonsugi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - I Shimizu
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - J Shirai
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Shiraishi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Suzuki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Suzuki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Takeuchi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Tamae
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Ueshima
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Watanabe
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Yoshida
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Obara
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
| | - A K Ichikawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - D Chernyak
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - A Kozlov
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - K Z Nakamura
- Kyoto University, Department of Physics, Kyoto 606-8502, Japan
| | - S Yoshida
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Takemoto
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S Umehara
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - K Fushimi
- Department of Physics, Tokushima University, Tokushima 770-8506, Japan
| | - K Kotera
- Graduate School of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Y Urano
- Graduate School of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - B E Berger
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - B K Fujikawa
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J G Learned
- Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
| | - J Maricic
- Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
| | - S N Axani
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J Smolsky
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Z Fu
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - L A Winslow
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Y Efremenko
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - H J Karwowski
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - D M Markoff
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - W Tornow
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - S Dell'Oro
- Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - T O'Donnell
- Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - J A Detwiler
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - S Enomoto
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - M P Decowski
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nikhef and the University of Amsterdam, Science Park, Amsterdam, Netherlands
| | - C Grant
- Boston University, Boston, Massachusetts 02215, USA
| | - A Li
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Boston University, Boston, Massachusetts 02215, USA
| | - H Song
- Boston University, Boston, Massachusetts 02215, USA
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3
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Ahn JK, Beckford B, Campbell M, Chen SH, Comfort J, Dona K, Farrington MS, Hanai K, Hara N, Haraguchi H, Hsiung YB, Hutcheson M, Inagaki T, Isoe M, Kamiji I, Kato T, Kim EJ, Kim JL, Kim HM, Komatsubara TK, Kotera K, Lee SK, Lee JW, Lim GY, Lin QS, Lin C, Luo Y, Mari T, Masuda T, Matsumura T, Mcfarland D, McNeal N, Miyazaki K, Murayama R, Nakagiri K, Nanjo H, Nishimiya H, Noichi Y, Nomura T, Nunes T, Ohsugi M, Okuno H, Redeker JC, Sanchez J, Sasaki M, Sasao N, Sato T, Sato K, Sato Y, Shimizu N, Shimogawa T, Shinkawa T, Shinohara S, Shiomi K, Shiraishi R, Su S, Sugiyama Y, Suzuki S, Tajima Y, Taylor M, Tecchio M, Togawa M, Toyoda T, Tung YC, Vuong QH, Wah YW, Watanabe H, Yamanaka T, Yoshida HY, Zaidenberg L. Study of the K_{L}→π^{0}νν[over ¯] Decay at the J-PARC KOTO Experiment. Phys Rev Lett 2021; 126:121801. [PMID: 33834796 DOI: 10.1103/physrevlett.126.121801] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
The rare decay K_{L}→π^{0}νν[over ¯] was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.05_{stat}±0.66_{syst})×10^{-10}, three candidate events were observed in the signal region. After unveiling them, contaminations from K^{±} and scattered K_{L} decays were studied, and the total number of background events was estimated to be 1.22±0.26. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of 4.9×10^{-9} on the branching fraction of K_{L}→π^{0}νν[over ¯] at the 90% confidence level.
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Affiliation(s)
- J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - B Beckford
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Campbell
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - S H Chen
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - J Comfort
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - K Dona
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M S Farrington
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - K Hanai
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Hara
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Haraguchi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y B Hsiung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - M Hutcheson
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - T Inagaki
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - M Isoe
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - I Kamiji
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Kato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - E J Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J L Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - H M Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - T K Komatsubara
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Kotera
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S K Lee
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J W Lee
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - G Y Lim
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - Q S Lin
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - C Lin
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Y Luo
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Mari
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Masuda
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - T Matsumura
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - D Mcfarland
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - N McNeal
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - K Miyazaki
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - R Murayama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - K Nakagiri
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nanjo
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nishimiya
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Noichi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Nomura
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - T Nunes
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Ohsugi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Okuno
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - J C Redeker
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - J Sanchez
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Sasaki
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - N Sasao
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - T Sato
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - K Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Shimizu
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Shimogawa
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - T Shinkawa
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - S Shinohara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Shiomi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - R Shiraishi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Su
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Y Sugiyama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Suzuki
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - Y Tajima
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - M Taylor
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Tecchio
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Togawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Toyoda
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y-C Tung
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Q H Vuong
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y W Wah
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - H Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - T Yamanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Y Yoshida
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - L Zaidenberg
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
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Ahn JK, Beckford B, Beechert J, Bryant K, Campbell M, Chen SH, Comfort J, Dona K, Hara N, Haraguchi H, Hsiung YB, Hutcheson M, Inagaki T, Kamiji I, Kawasaki N, Kim EJ, Kim JL, Kim YJ, Ko JW, Komatsubara TK, Kotera K, Kurilin AS, Lee JW, Lim GY, Lin C, Lin Q, Luo Y, Ma J, Maeda Y, Mari T, Masuda T, Matsumura T, Mcfarland D, McNeal N, Micallef J, Miyazaki K, Murayama R, Naito D, Nakagiri K, Nanjo H, Nishimiya H, Nomura T, Ohsugi M, Okuno H, Sasaki M, Sasao N, Sato K, Sato T, Sato Y, Schamis H, Seki S, Shimizu N, Shimogawa T, Shinkawa T, Shinohara S, Shiomi K, Su S, Sugiyama Y, Suzuki S, Tajima Y, Taylor M, Tecchio M, Togawa M, Tung YC, Wah YW, Watanabe H, Woo JK, Yamanaka T, Yoshida HY. Search for K_{L}→π^{0}νν[over ¯] and K_{L}→π^{0}X^{0} Decays at the J-PARC KOTO Experiment. Phys Rev Lett 2019; 122:021802. [PMID: 30720307 DOI: 10.1103/physrevlett.122.021802] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 12/14/2018] [Indexed: 06/09/2023]
Abstract
A search for the rare decay K_{L}→π^{0}νν[over ¯] was performed. With the data collected in 2015, corresponding to 2.2×10^{19} protons on target, a single event sensitivity of (1.30±0.01_{stat}±0.14_{syst})×10^{-9} was achieved and no candidate events were observed. We set an upper limit of 3.0×10^{-9} for the branching fraction of K_{L}→π^{0}νν[over ¯] at the 90% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for K_{L}→π^{0}X^{0} was also set as 2.4×10^{-9} at the 90% C.L., where X^{0} is an invisible boson with a mass of 135 MeV/c^{2}.
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Affiliation(s)
- J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - B Beckford
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - J Beechert
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - K Bryant
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Campbell
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - S H Chen
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - J Comfort
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - K Dona
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - N Hara
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Haraguchi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y B Hsiung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - M Hutcheson
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - T Inagaki
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - I Kamiji
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - N Kawasaki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - E J Kim
- Division of Science Education, Chonbuk National University, Jeonju 54896, Republic of Korea
| | - J L Kim
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - Y J Kim
- Department of Physics, Jeju National University, Jeju 63243, Republic of Korea
| | - J W Ko
- Department of Physics, Jeju National University, Jeju 63243, Republic of Korea
| | - T K Komatsubara
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Kotera
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - A S Kurilin
- Laboratory of Nuclear Problems, Joint Institute for Nuclear Researches, Dubna, Moscow region 141980, Russia
| | - J W Lee
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - G Y Lim
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - C Lin
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Q Lin
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y Luo
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - J Ma
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y Maeda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Mari
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Masuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Matsumura
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - D Mcfarland
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - N McNeal
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - J Micallef
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - K Miyazaki
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - R Murayama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - D Naito
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Nakagiri
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nanjo
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nishimiya
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Nomura
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - M Ohsugi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Okuno
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - M Sasaki
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - N Sasao
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - K Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Sato
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Y Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Schamis
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - S Seki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - N Shimizu
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Shimogawa
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - T Shinkawa
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - S Shinohara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Shiomi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - S Su
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Y Sugiyama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Suzuki
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - Y Tajima
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - M Taylor
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Tecchio
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Togawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y C Tung
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y W Wah
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - H Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - J K Woo
- Department of Physics, Jeju National University, Jeju 63243, Republic of Korea
| | - T Yamanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Y Yoshida
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
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5
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Fujimoto M, Kubota T, Kotera K. Electrochemical profile of K and Cl ions across the proximal tubule of bullfrog kidneys: a study using double-barreled ion-sensitive microelectrodes. Contrib Nephrol 2015; 6:114-23. [PMID: 300666 DOI: 10.1159/000399757] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Micropuncture study was performed in the proximal segment of bullfrog nephrons with double-barreled ion-sensitive microelectrodes to determine the electrochemical profile of K and Cl across the individual borders of tubular epithelium. The mean peritubular potential obtained was -68.4 mV, and the K activity in the plasma and the cell interior was 2.64 and 61.6 mEq/liter, respectively. The calculated equilibrium potential for K was 79.3 mV. Therefore, the cell K must be maintained by some K uptake mechanism against an electrochemical gradient of 11 mV. Further, the K activity of the tubular fluid was 2.92 mEq/liter and the actually measured PD across the brush border membrane was -55.7 mV. Since the calculated Nernst K potential is 76.8 mV, the K entry from lumen to cell must be done against an electrochemical gradient of 21.1 mV in the net. These facts might suggest a possibility of bilateral existence of K uptake mechanism in both the peritubular and brush border membranes of proximal tubular cells. In contrast, the Cl activity was measured to be 9.30, 78.0, and 72.5 mEq/liter for the cell, tubular fluid, and plasma, respectively. The Nernst Cl potentials calculated were 53.6 and 51.7 mV for the brush border and the peritubular membrane, the data being less than the actually determined values, 55.7 and 68.4 mV, respectively. Thus, the Cl ion seemed to distribute passively throughout its reabsorptive process in the bullfrog proximal tubule.
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Abreu P, Aglietta M, Ahn EJ, Albuquerque IFM, Allard D, Allekotte I, Allen J, Allison P, Almeda A, Alvarez Castillo J, Alvarez-Muñiz J, Ambrosio M, Aminaei A, Anchordoqui L, Andringa S, Antičić T, Aramo C, Arganda E, Arqueros F, Asorey H, Assis P, Aublin J, Ave M, Avenier M, Avila G, Bäcker T, Balzer M, Barber KB, Barbosa AF, Bardenet R, Barroso SLC, Baughman B, Bäuml J, Beatty JJ, Becker BR, Becker KH, Bellétoile A, Bellido JA, Benzvi S, Berat C, Bertou X, Biermann PL, Billoir P, Blanco F, Blanco M, Bleve C, Blümer H, Boháčová M, Boncioli D, Bonifazi C, Bonino R, Borodai N, Brack J, Brogueira P, Brown WC, Bruijn R, Buchholz P, Bueno A, Burton RE, Caballero-Mora KS, Caramete L, Caruso R, Castellina A, Catalano O, Cataldi G, Cazon L, Cester R, Chauvin J, Cheng SH, Chiavassa A, Chinellato JA, Chirinos Diaz J, Chudoba J, Clay RW, Coluccia MR, Conceição R, Contreras F, Cook H, Cooper MJ, Coppens J, Cordier A, Coutu S, Covault CE, Creusot A, Criss A, Cronin J, Curutiu A, Dagoret-Campagne S, Dallier R, Dasso S, Daumiller K, Dawson BR, de Almeida RM, De Domenico M, De Donato C, de Jong SJ, De La Vega G, de Mello Junior WJM, de Mello Neto JRT, De Mitri I, de Souza V, de Vries KD, Decerprit G, del Peral L, del Río M, Deligny O, Dembinski H, Dhital N, Di Giulio C, Díaz Castro ML, Diep PN, Dobrigkeit C, Docters W, D'Olivo JC, Dong PN, Dorofeev A, dos Anjos JC, Dova MT, D'Urso D, Dutan I, Ebr J, Engel R, Erdmann M, Escobar CO, Espadanal J, Etchegoyen A, Facal San Luis P, Fajardo Tapia I, Falcke H, Farrar G, Fauth AC, Fazzini N, Ferguson AP, Ferrero A, Fick B, Filevich A, Filipčič A, Fliescher S, Fracchiolla CE, Fraenkel ED, Fröhlich U, Fuchs B, Gaior R, Gamarra RF, Gambetta S, García B, Garcia-Gamez D, Garcia-Pinto D, Gascon A, Gemmeke H, Gesterling K, Ghia PL, Giaccari U, Giller M, Glass H, Gold MS, Golup G, Gomez Albarracin F, Gómez Berisso M, Gonçalves P, Gonzalez D, Gonzalez JG, Gookin B, Góra D, Gorgi A, Gouffon P, Gozzini SR, Grashorn E, Grebe S, Griffith N, Grigat M, Grillo AF, Guardincerri Y, Guarino F, Guedes GP, Guzman A, Hague JD, Hansen P, Harari D, Harmsma S, Harrison TA, Harton JL, Haungs A, Hebbeker T, Heck D, Herve AE, Hojvat C, Hollon N, Holmes VC, Homola P, Hörandel JR, Horneffer A, Horvath P, Hrabovský M, Huege T, Insolia A, Ionita F, Italiano A, Jarne C, Jiraskova S, Josebachuili M, Kadija K, Kampert KH, Karhan P, Kasper P, Kégl B, Keilhauer B, Keivani A, Kelley JL, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Knapp J, Koang DH, Kotera K, Krohm N, Krömer O, Kruppke-Hansen D, Kuehn F, Kuempel D, Kulbartz JK, Kunka N, La Rosa G, Lachaud C, Lauer R, Lautridou P, Le Coz S, Leão MSAB, Lebrun D, Lebrun P, Leigui de Oliveira MA, Lemiere A, Letessier-Selvon A, Lhenry-Yvon I, Link K, López R, Lopez Agüera A, Louedec K, Lozano Bahilo J, Lu L, Lucero A, Ludwig M, Lyberis H, Macolino C, Maldera S, Mandat D, Mantsch P, Mariazzi AG, Marin J, Marin V, Maris IC, Marquez Falcon HR, Marsella G, Martello D, Martin L, Martinez H, Martínez Bravo O, Mathes HJ, Matthews J, Matthews JAJ, Matthiae G, Maurizio D, Mazur PO, Medina-Tanco G, Melissas M, Melo D, Menichetti E, Menshikov A, Mertsch P, Meurer C, Mićanović S, Micheletti MI, Miller W, Miramonti L, Molina-Bueno L, Mollerach S, Monasor M, Monnier Ragaigne D, Montanet F, Morales B, Morello C, Moreno E, Moreno JC, Morris C, Mostafá M, Moura CA, Mueller S, Muller MA, Müller G, Münchmeyer M, Mussa R, Navarra G, Navarro JL, Navas S, Necesal P, Nellen L, Nelles A, Neuser J, Nhung PT, Niemietz L, Nierstenhoefer N, Nitz D, Nosek D, Nožka L, Nyklicek M, Oehlschläger J, Olinto A, Olmos-Gilbaja VM, Ortiz M, Pacheco N, Pakk Selmi-Dei D, Palatka M, Pallotta J, Palmieri N, Parente G, Parizot E, Parra A, Parsons RD, Pastor S, Paul T, Pech M, Pekala J, Pelayo R, Pepe IM, Perrone L, Pesce R, Petermann E, Petrera S, Petrinca P, Petrolini A, Petrov Y, Petrovic J, Pfendner C, Phan N, Piegaia R, Pierog T, Pieroni P, Pimenta M, Pirronello V, Platino M, Ponce VH, Pontz M, Privitera P, Prouza M, Quel EJ, Querchfeld S, Rautenberg J, Ravel O, Ravignani D, Revenu B, Ridky J, Riggi S, Risse M, Ristori P, Rivera H, Rizi V, Roberts J, Robledo C, Rodrigues de Carvalho W, Rodriguez G, Rodriguez Martino J, Rodriguez Rojo J, Rodriguez-Cabo I, Rodríguez-Frías MD, Ros G, Rosado J, Rossler T, Roth M, Rouillé-d'Orfeuil B, Roulet E, Rovero AC, Rühle C, Salamida F, Salazar H, Salesa Greus F, Salina G, Sánchez F, Santo CE, Santos E, Santos EM, Sarazin F, Sarkar B, Sarkar S, Sato R, Scharf N, Scherini V, Schieler H, Schiffer P, Schmidt A, Scholten O, Schoorlemmer H, Schovancova J, Schovánek P, Schröder F, Schulte S, Schuster D, Sciutto SJ, Scuderi M, Segreto A, Settimo M, Shadkam A, Shellard RC, Sidelnik I, Sigl G, Silva Lopez HH, Smiałkowski A, Smída R, Snow GR, Sommers P, Sorokin J, Spinka H, Squartini R, Stanic S, Stapleton J, Stasielak J, Stephan M, Stutz A, Suarez F, Suomijärvi T, Supanitsky AD, Suša T, Sutherland MS, Swain J, Szadkowski Z, Szuba M, Tamashiro A, Tapia A, Tartare M, Taşcău O, Tavera Ruiz CG, Tcaciuc R, Tegolo D, Thao NT, Thomas D, Tiffenberg J, Timmermans C, Tiwari DK, Tkaczyk W, Todero Peixoto CJ, Tomé B, Tonachini A, Travnicek P, Tridapalli DB, Tristram G, Trovato E, Tueros M, Ulrich R, Unger M, Urban M, Valdés Galicia JF, Valiño I, Valore L, van den Berg AM, Varela E, Vargas Cárdenas B, Vázquez JR, Vázquez RA, Veberič D, Verzi V, Vicha J, Videla M, Villaseñor L, Wahlberg H, Wahrlich P, Wainberg O, Walz D, Warner D, Watson AA, Weber M, Weidenhaupt K, Weindl A, Westerhoff S, Whelan BJ, Wieczorek G, Wiencke L, Wilczyńska B, Wilczyński H, Will M, Williams C, Winchen T, Winnick MG, Wommer M, Wundheiler B, Yamamoto T, Yapici T, Younk P, Yuan G, Yushkov A, Zamorano B, Zas E, Zavrtanik D, Zavrtanik M, Zaw I, Zepeda A, Zhu Y, Zimbres Silva M, Ziolkowski M. Measurement of the proton-air cross section at √s=57 TeV with the Pierre Auger Observatory. Phys Rev Lett 2012; 109:062002. [PMID: 23006259 DOI: 10.1103/physrevlett.109.062002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Indexed: 06/01/2023]
Abstract
We report a measurement of the proton-air cross section for particle production at the center-of-mass energy per nucleon of 57 TeV. This is derived from the distribution of the depths of shower maxima observed with the Pierre Auger Observatory: systematic uncertainties are studied in detail. Analyzing the tail of the distribution of the shower maxima, a proton-air cross section of [505±22(stat)(-36)(+28)(syst)] mb is found.
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Affiliation(s)
- P Abreu
- LIP and Instituto Superior Técnico, Technical University of Lisbon, Lisbon, Portugal
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Phillips DG, Ping H, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, Zukanovich RF. Search for the rare decays K(L)→π0π0μ+μ- and K(L)→π0π0X0→π0π0μ+μ-. Phys Rev Lett 2011; 107:201803. [PMID: 22181724 DOI: 10.1103/physrevlett.107.201803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Indexed: 05/31/2023]
Abstract
The KTeV E799 experiment has conducted a search for the rare decays, K(L)→π(0)π(0)μ(+)μ(-) and K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-), where the X(0) is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 ± 0.5) MeV/c(2). We find no evidence for either decay. We obtain upper limits of Br(K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-)) < 1.0 × 10(-10) and Br(K(L)→π(0)π(0)μ(+)μ(-)) < 9.2 × 10(-11) at the 90% confidence level. This result rules out the pseudoscalar X(0) as an explanation of the HyperCP result under the scenario that the dsX(0) coupling is completely real.
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Affiliation(s)
- E Abouzaid
- The Enrico Fermi Institute, The University of Chicago, Illinois 60637, USA
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8
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Corti G, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Phillips DG, Ping H, Ramberg EJ, Ray RE, Ronquest M, Santos E, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, Zukanovich RF. Search for the rare decayKL→π0π0γ. Int J Clin Exp Med 2008. [DOI: 10.1103/physrevd.78.032014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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9
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Phillips DG, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winstein B, Winston R, Worcester ET, Yamanaka T, Zimmerman ED, Zukanovich RF. Determination of the parity of the neutral pion via its four-electron decay. Phys Rev Lett 2008; 100:182001. [PMID: 18518364 DOI: 10.1103/physrevlett.100.182001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2008] [Indexed: 05/26/2023]
Abstract
We present a new determination of the parity of the neutral pion via the double Dalitz decay pi0-->e+e-e+e-. Our sample, which consists of 30,511 candidate decays, was collected from KL-->pi0pi0pi0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative pi0 parity and place a limit on scalar contributions to the pi0-->e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The pi0gamma*gamma* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(pi0-->e+e-e+e-)=(3.26+/-0.18)x10(-5).
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Affiliation(s)
- E Abouzaid
- The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
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10
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Ii DGP, Ping H, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winstein B, Winston R, Wolfe C, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, Zukanovich RF. Search for lepton-flavor-violating decays of the neutral kaon. Phys Rev Lett 2008; 100:131803. [PMID: 18517936 DOI: 10.1103/physrevlett.100.131803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2007] [Indexed: 05/26/2023]
Abstract
The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the K(L) meson in three decay modes. We observe no events in the signal region for any of the modes studied, and we set the following upper limits for their branching ratios at the 90% C.L.: BR(K(L) --> pi(0) micro(+/-) e(-/+)) <7.6 x 10(-11); BR(K(L) --> pi(0)pi(0) micro(+/-) e(-/+)) <1.7 x 10(-10); BR(pi(0) --> micro(+/-) e(-/+)) <3.6 x 10(-10). This result represents a factor of 82 improvement in the branching ratio limit for K(L) --> pi(0) micro(+/-) e(-/+) and is the first reported limit for K(L) --> pi(0)pi(0) micro(+/-) e(-/+).
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Affiliation(s)
- E Abouzaid
- The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
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11
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Phillips DG, Ping H, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winstein B, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, Zukanovich RF. First observation of K{L}-->pi{+/-}e{-/+}nue{+}e{-}. Phys Rev Lett 2007; 99:081803. [PMID: 17930940 DOI: 10.1103/physrevlett.99.081803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2007] [Indexed: 05/25/2023]
Abstract
This Letter is the first report of the K{L}-->pi{+/-}e{-/+}nue{+}e{-} decay. Based on 19 208+/-144 events, we determine the branching fraction, B(K{L}-->pi{+/-}e{-/+}nue{+}e{-}M_{e{+}e{-}}>5 MeV/c{2},E{e{+}e{-}}{*}>30 MeV)=(1.285+/-0.041)x10{-5}, and Gamma(K{e3ee}M{e{+}e{-}}>5 MeV/c{2})/Gamma(K{e3})=[4.57+/-0.04(stat)+/-0.14(syst)]x10{-5}. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p{4}). The measured kinematical distributions agree with those predicted by just ChPT O(p{4}), but show significant disagreement with ones predicted by leading-order ChPT.
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Affiliation(s)
- E Abouzaid
- The Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA
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12
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Glazov A, Golossanov A, Hsiung YB, Jensen DA, Kessler R, Kobrak HGE, Kotera K, LaDue J, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Ramberg EJ, Ray RE, Ronquest M, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winston R, Worcester ET, Yamanaka T, Zimmerman ED. Measurements of the decay KL-->e+ e- gamma. Phys Rev Lett 2007; 99:051804. [PMID: 17930743 DOI: 10.1103/physrevlett.99.051804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Indexed: 05/25/2023]
Abstract
The E799-II (KTeV) experiment at Fermilab has collected 83 262 K(L)-->e+ e- gamma(gamma) events above a background of 79 events. We measure a decay width, normalized to the K(L)-->pi0pi0pi(D)0 (pi0-->gammagamma, pi0-->gammagamma, pi(D0-->e+ e- gamma(gamma)) decay width, of Gamma(K(L)-->e+e-gamma(gamma))/Gamma(K(L)-->pi0pi0pi(D)0)=(1.3302+/-0.0046(stat)+/-0.0102(syst)) x 10(-3). We also measure parameters of two K(L)gamma*gamma form factor models. In the Bergström-Massó-Singer parametrization, we find Calpha(K*)= -0.517 +/- 0.030(stat) +/- 0.022(syst). We separately fit for the first parameter of the D'Ambrosio-Isidori-Portolés model and find alpha(DIP)= -1.729 +/- 0.043(stat) +/- 0.028(syst).
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Affiliation(s)
- E Abouzaid
- The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
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13
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Abouzaid E, Alavi-Harati A, Alexopoulos T, Arenton M, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Bright S, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Ford R, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hanagaki K, Hsiung YB, Huang H, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Ping H, Prasad V, Qi XR, Ramberg EJ, Ray RE, Ronquest M, Rooker T, Santos E, Shields J, Slater W, Smith DE, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, Zukanovich RF. Ξ0andΞ¯0polarization measurements at800 GeV/c. Int J Clin Exp Med 2007. [DOI: 10.1103/physrevd.75.012005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Glazov A, Golossanov A, Hsiung YB, Huang H, Jensen DA, Kessler R, Kobrak HGE, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Ramberg EJ, Ray RE, Ronquest M, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Yamanaka T, Zimmerman ED. ImprovedKL→π±e∓νform factor and phase space integral with reduced model uncertainty. Int J Clin Exp Med 2006. [DOI: 10.1103/physrevd.74.097101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Abouzaid E, Arenton M, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Corti G, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hanagaki K, Hsiung YB, Huang H, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Ping H, Qi XR, Ramberg EJ, Ray RE, Ronquest M, Santos E, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worchester ET, Worchester M, Yamanaka T, Zimmerman ED, Zukanovich RF. Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL--> pi+ pi- e+ e-. Phys Rev Lett 2006; 96:101801. [PMID: 16605723 DOI: 10.1103/physrevlett.96.101801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2005] [Indexed: 05/08/2023]
Abstract
Using the complete KTeV data set of 5,241 candidate K(L)--> pi(+) pi(-) e(+) e(-) decays (including an estimated background of 204 +/- 14 events), we have measured the coupling g(CR)= 0.163 +/- 0.0149(stat) +/- 0.023(syst) of the CP conserving charge radius process and from it determined a K(0) charge radius of <r(2)(K(0))> = [-0.077 +/- 0.007(stat) +/- 0.011(syst)]fm(2). We have determined a first experimental upper limit of 0.04 (90% C.L.) /g(e1)/ / /g(M1)/ of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of /g(M1)/ including a vector form factor /g(M1)/(1 + (a(1)/a(2))/((M(2)(p)-(M(2)(k))= 2M(K)E(gamma*)), where vector /g(M1)/= 1.11+/- 0.12(stat) +/- 0.08(syst) and a(1)/a(2) = [-0.744 +/- 0.027(stat) +/- 0.032(syst)] GeV(2)/c(2). Finally, a CP-violating asymmetry of [13.6 +/- 1.4(stat) +/- 1.5(syst)]% in the CP and T odd angle phi between the decay planes of the e(+) e(-) and pi(+) pi(-) pairs in the K(L) center of mass is reported.
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Affiliation(s)
- E Abouzaid
- The Enrico Fermi Institute, The University of Chicago, Illinois 60637, USA
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Soh Y, Goto S, Kitajima M, Moriyama S, Kotera K, Nakayama T, Nakajima H, Kondo T, Ishimaru T. Nuclear localisation of glutathione S-transferase pi is an evaluation factor for drug resistance in gynaecological cancers. Clin Oncol (R Coll Radiol) 2005; 17:264-70. [PMID: 15997922 DOI: 10.1016/j.clon.2004.11.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIMS Nuclear glutathione S-transferase pi (GST7pi) has been reported to protect cancer cells against anticancer drugs. The aim of the present study was to evaluate the clinical significance of nuclear GSTpi in gynaecological cancer. MATERIALS AND METHODS We carried out an immunohistochemical analysis of GSTpi, and examined the correlation between nuclear GSTpi: expression and prognosis in 43 epithelial ovarian cancers. We compared expression levels before and after chemotherapy in uterine cervical cancers and endometrial cancers. RESULTS The 5-year progression-free survival rate of the nuclear GSTpi-positive group was lower than that of the cytoplasmic GSTpi-positive group, and was significantly lower than that of the negative group (14.3% vs 34.8% vs 66.7%; P = 0.041). The expression of nuclear GSTpi was compared before and after chemotherapy in uterine cervical and endometrial cancers. In eight out of 12 cases (66.7%), the expression turned positive after the chemotherapy. CONCLUSIONS We suggest that nuclear localisation of GSTpi is associated with drug resistance. The nuclear localisation of GSTpi in tumour cells is a useful prognosticator, and may contribute to the selection of anticancer drugs for gynaecological cancers.
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Affiliation(s)
- Y Soh
- Department of Obstetrics and Gynecology, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
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17
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Abouzaid E, Alexopoulos T, Arenton M, Barbosa RF, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hanagaki K, Hsiung YB, Huang H, Jensen DA, Kessler R, Kotera K, LaDue J, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Ping H, Prasad V, Qi XR, Ramberg EJ, Ray RE, Ronquest M, Santos E, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, Zukanovich RF. Observation of the decay xi0 --> sigma+ mu- nu(mu). Phys Rev Lett 2005; 95:081801. [PMID: 16196851 DOI: 10.1103/physrevlett.95.081801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2005] [Indexed: 05/04/2023]
Abstract
The xi0 muon semileptonic decay has been observed for the first time with nine identified events using the KTeV beam line and detector at Fermilab. The decay is normalized to the xi0 beta decay mode and yields a value for the ratio of decay rates gamma(xi0 --> sigma+ mu- nu(mu))/gamma(xi0 --> sigma+ e- nu(e)) of [1.8(-0.5)(+0.7)(stat) +/- 0.2(syst)] x 10(-2). This is in agreement with the SU(3) flavor symmetric quark model.
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Affiliation(s)
- E Abouzaid
- The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA
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18
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Alexopoulos T, Arenton M, Barbosa RF, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Childress S, Coleman R, Corcoran MD, Cox B, Erwin AR, Ford R, Glazov A, Golossanov A, Graham J, Hamm J, Hanagaki K, Hsiung YB, Huang H, Jejer V, Jensen DA, Kessler R, Kobrak HGE, Kotera K, LaDue J, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Prasad V, Qi XR, Ramberg EJ, Ray RE, Ronquest M, Santos E, Shanahan P, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Yamanaka T, Zimmerman ED. A determination of the Cabibbo-Kobayashi-Maskawa parameter |V us| using KL decays. Phys Rev Lett 2004; 93:181802. [PMID: 15525151 DOI: 10.1103/physrevlett.93.181802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2004] [Indexed: 05/24/2023]
Abstract
We present a determination of the Cabibbo-Kobayashi-Maskawa parameter |V(us)| based on new measurements of the six largest K(L) branching fractions and semileptonic form factors by the KTeV (E832) experiment at Fermilab. We find |V(us)|=0.2252+/-0.0008(KTeV)+/-0.0021(ext), where the errors are from KTeV measurements and from external sources. We also use the measured branching fractions to determine the CP violation parameter |eta(+-)|=(2.228+/-0.005(KTeV)+/-0.009(ext))x10(-3).
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19
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Alavi-Harati A, Alexopoulos T, Arenton M, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Ford R, Glazov A, Golossanov A, Gomes RA, Gouffon P, Graham J, Hamm J, Hanagaki K, Hsiung YB, Huang H, Jejer V, Jensen DA, Kessler R, Kobrak HGE, Kotera K, LaDue J, Lai N, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Ping H, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Ronquest M, Santos E, Senyo K, Shanahan P, Shields J, Slater W, Smith DE, Solomey N, Swallow EC, Taegar SA, Tesarek RJ, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Yamanaka T, Zukanovich RF. Search for the rare decay K(L)-->pi(0)e(+)e(-). Phys Rev Lett 2004; 93:021805. [PMID: 15323902 DOI: 10.1103/physrevlett.93.021805] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2003] [Indexed: 05/24/2023]
Abstract
The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay K(L)-->pi(0)e(+)e(-). This mode is expected to have a significant CP violating component. The measurement of its branching ratio could support the standard model or could indicate the existence of new physics. This Letter reports new results from the 1999-2000 data set. One event is observed with an expected background at 0.99+/-0.35 events. We set a limit on the branching ratio of 3.5x10(-10) at the 90% confidence level. Combining with the previous result based on the data set taken in 1997 yields the final KTeV result: BR(K(L)-->pi(0)e(+)e(-))<2.8x10(-10) at 90% C.L.
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Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Ford R, Glazov A, Golossanov A, Gouffon P, Graham J, Hamm J, Hanagaki K, Hsiung YB, Huang H, Jejer V, Jensen DA, Kessler R, Kobrak HGE, Kotera K, LaDue J, Lai N, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Santos E, Senyo K, Shanahan P, Shields J, Slater W, Solomey N, Swallow EC, Taegar SA, Tesarek RJ, Toale PA, Tripathi A, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Yamanaka T, Zukanovich RF. Measurements of the Decay KL-->e+ e- mu+ mu-. Phys Rev Lett 2003; 90:141801. [PMID: 12731905 DOI: 10.1103/physrevlett.90.141801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2002] [Revised: 02/18/2003] [Indexed: 05/24/2023]
Abstract
The KTeV experiment at Fermilab has isolated a total of 132 events from the rare decay K(L)-->e+ e- mu+ mu-, with an estimated background of 0.8 events. The branching ratio of this mode is determined to be [2.69+/-0.24(stat)+/-0.12(syst)]x10(-9), with a radiative cutoff of M(2)(ee mu mu)/M(2)(K)>0.95. The first measurement using this mode of the parameter alpha from the D'Ambrosio-Isidori-Portolès (DIP) model of the K(L)gamma*gamma* vertex yields a result of -1.59+/-0.37, consistent with values obtained from other decay modes. Because of the limited statistics, no sensitivity is found to the DIP parameter beta. We use this decay mode to set limits on CP and lepton violation.
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21
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Matsumoto K, Konishi N, Hiasa Y, Nakaoka S, Kimura E, Hirooka T, Kurosaka H, Kotera K, Samori T. [Newly developed detection system for serum Helicobacter pylori antibodies using ELISA and its clinical significance]. Rinsho Byori 1995; 43:370-374. [PMID: 7739119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Using ELISA, a specific and sensitive system that detects serum immunoglobulin G antibodies against all soluble antigens of Helicobacter pylori (Hp) has been developed. This system is used at three different concentrations of Hp antigens coated on the solid phase of the ELISA. Anti-Hp antibodies were judged positive when the difference in the ELISA values between high and middle or middle and low concentrations of antigen were over the specific values. For the ELISA system, called the three point antigen method, sensitivity and specificity of urease activity were 86.9% and 70.8%, respectively. Positive rate for antibodies to serum Helicobacter pylori in dyspeptic patients was higher than that in healthy subjects.
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22
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Fujimoto M, Mori Y, Hagiwara N, Kubota T, Kotera K. Functional significance of K+ and Cl- channels in volume regulation in proximal tubular cells. Jpn J Physiol 1994; 44 Suppl 2:S43-S48. [PMID: 7752553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Using the patch-clamp technique to cultured opossum kidney (OK) cells, we measured the activities of K+ channel and Cl- conductance during hyposmotic stress. The results are as follows: 1) A 50% lowered osmolarity of bath media induced a biphasic change of the membrane potential (EM): early hyperpolarization and late depolarization. The former transient response was abolished by removing Ca2+ from the cellular media, whereas the latter slow response was blocked by DIDS. 2) The hyposmosis-induced change of EM was due to K+ channels activated by cytosolic Ca2+. 3) In hyposmotic media, Cl- current was effectively increased, and this effect was abolished by Cl- channel blockers. 4) The hyposmosis-induced Cl- conductance was inhibited in the cytosolic acid media. In the alkaline media, it was enhanced even without hyposmotic stress. We conclude that the hyposmosis-induced activation of Cl- conductance, being stimulated by alkaline cell pH and inhibited by acid cell pH, may contribute to the ion transport and cell volume regulation along with the Ca(2+)-activated K+ channel.
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Affiliation(s)
- M Fujimoto
- Department of Physiology, Osaka Medical College, Japan
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23
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Matsumoto K, Hashimoto K, Samori T, Taniguchi M, Kotera K, Nishi S, Takatsuji M, Higashi K, Itoh K. [Clinical significance of the measurement of serum pepsinogen group I and II by enzyme-linked immunosorbent assay]. Rinsho Byori 1992; 40:977-81. [PMID: 1434035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We have developed enzyme-linked immunosorbent assay (ELISA) for pepsinogen group I and II (PG I.II) in human serum, and clinical significance of serum pepsinogen measurement was evaluated. Serum PG I.II levels in patients with gastric and duodenal ulcer were higher than those in normal healthy subjects. On the other hand, serum PG I levels in patients with pernicious anemia were significantly low levels. In both gastric ulcer and duodenal ulcer, serum PG I.II levels at active stage were higher than healing stage. These results suggested that the measurement of PG I.II levels was useful for screening or monitoring test for the injury of gastric and duodenal mucosa.
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Affiliation(s)
- K Matsumoto
- Japan Medical Institute of Clinical Laboratory Examination, Suita
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24
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Kubokawa M, Kubota T, Kotera K, Fujimoto M. Acid-induced two-step depolarization in the peritubular membrane of bullfrog kidney proximal tubules. Jpn J Physiol 1992; 42:389-406. [PMID: 1434101 DOI: 10.2170/jjphysiol.42.389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Using ion-selective microelectrode technique, we investigated acid-induced changes of peritubular membrane potential (EM) and intracellular activity of Na+ and H+ ((Na)i and pHi) in the proximal tubule of perfused bullfrog kidney in vivo. When peritubular pH was reduced at constant PCO2, EM was depolarized in two steps: i.e., an initial sharp fall followed by an additional deeper fall. This was termed as the acid-induced two-step depolarization. During this change, pHi was decreased gradually from 7.4 to 6.9 in response to 1/10 HCO3- reduction (pH from 7.7 to 6.7), whereas (Na)i was increased after a transient decrease. This result supports the peritubular rheogenic HCO3- exit coupled to Na+ movement during the initial depolarization period. Complete removal of peritubular HCO3- at constant pH produced a less marked initial depolarization with a transient rise of pHi, followed by a partial repolarization without appreciable change in (Na)i. Peritubular SITS administration inhibited these depolarization responses to the acid perfusion. The above findings suggest that 1) the initial part of the two-step EM depolarization produced by low HCO3- or HCO(3-)-free perfusion resulted mainly from the peritubular rheogenic exist of HCO3-, 2) the magnitude of initial depolarization would also be affected by pHi, and 3) the subsequent delayed changes of EM were mainly determined by the pHi-sensitive K+ conductance of the peritubular membrane.
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Affiliation(s)
- M Kubokawa
- Department of Physiology, Osaka Medical College, Takatsuki, Japan
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Fujimoto M, Kubota T, Hagiwara N, Ohno-Shosaku T, Kubokawa M, Kotera K. Ion-selective microelectrodes to study proton and bicarbonate transport in the renal epithelium. Kidney Int Suppl 1991; 33:S23-8. [PMID: 1653869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We have developed several kinds of ISM, and obtained valuable information. The method presented provides (1) the data in situ, and (2) simultaneous data of the membrane potential and the selected ionic activities. Both of these give the driving forces for ion fluxes across the individual membrane border. They provide not only the knowledge of ionic status in minute spaces but also the relationship between different ionic species which are measured simultaneously in the living cell. Further information could also be available by employing this ISM method in combination with the relevant techniques, such as patch-clamp and fluorescent dye techniques.
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Affiliation(s)
- M Fujimoto
- Department of Physiology, Osaka Medical College, Japan
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26
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Fujimoto M, Kubota T, Hagiwara N, Kubokawa M, Ohno-Shosaku T, Kotera K. Relationship between cytosolic activities of calcium and pH in frog proximal tubules. Jpn J Physiol 1990; 40:273-96. [PMID: 2395240 DOI: 10.2170/jjphysiol.40.273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
To examine the effect of acid-base changes on the cytosolic calcium activity, (Ca)i, we used ion-selective microelectrodes in doubly perfused preparations of bullfrog kidney proximal tubule. For analyzing the time course of changes in (Ca)i and cytosolic pH (pHi) in response to peritubular acid or alkali perfusion and high K+, low Na+, or low Ca2+ perfusion single-barreled PVC-resin Ca2(+)-selective microelectrodes and double-barreled pH-sensitive microelectrodes were inserted into the cells. Control values (mean +/- S.E., number of observations) of (Ca)i and pHi averaged 17.2 +/- 1.0 nM (n = 25) and 7.39 +/- 0.01 (n = 25), respectively. Peritubular perfusion with a low pH perfusate (low HCO3-, pH 6.7) was found to reduce (Ca)i to about 4 nM in association with a moderate degree of cell acidification (to pH 7.09) and depolarization of the peritubular membrane potential (control -60 mV to experimental approximately -40 mV). Further, peritubular alkalinization (high HCO3- 30 mM, pH 8.0) induced a transient elevation of (Ca)i and hyperpolarization. In contrast, the peritubular perfusion of high K+ solution induced a rise of (Ca)i and pHi with membrane depolarization, while low Na+ perfusion decreased (Ca)i and pHi. These results support the view that 1) the experimentally induced changes in the membrane potential may be ascribed in large part of alterations of pH-sensitive conductance across the peritubular membrane, and 2) the cell pH and extracellular Ca2+ affect the cytosolic Ca2+ of the proximal tubule.
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Affiliation(s)
- M Fujimoto
- Department of Physiology, Osaka Medical College, Takatsuki, Japan
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Fujimoto M, Hagiwara N, Kubota T, Kotera K. The effect of cAMP on ion transport in the proximal tubular cells in bullfrog kidney. Jpn J Physiol 1988; 38:619-41. [PMID: 2851674 DOI: 10.2170/jjphysiol.38.619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
UNLABELLED Using a direct cellular micropuncture technique with double-barreled ion-selective microelectrodes, we investigated the effect of dibutyryl-cyclic AMP (db-cAMP) on the membrane potential and the transport of Na+, K+, and H+ in doubly-perfused bullfrog proximal tubules. The peritubular membrane potential difference (EM) and the intracellular K+, Na+ activities ((K)i, (Na)i) or intracellular and luminal pH were monitored continuously after peritubular administration of db-cAMP (10(-3)-10(-4)M). RESULTS 1) db-cAMP hyperpolarized the EM by 8.0 mV with an increase of (K)i by 4.8 mEq/l; 2) the peritubular administration of high K+ (13.5 and 50 mM) solutions depolarized the EM by 11.5 and 41.5 mV, respectively. The high K+ perfusate with db-cAMP produced a depolarization to the same level as that in simple high K+ perfusion without db-cAMP; 3) db-cAMP transiently blocked the luminal acidification concomitantly with a cellular alkalinization by about 0.1 pH; and 4) db-cAMP caused a decrease of (Na)i by 5.0 mEq/l. CONCLUSIONS 1) cAMP causes an increase of K+ permeability in the peritubular membrane; 2) cAMP induces a cytosol alkalosis by enhancing incorporation of H+ into the subcellular vesicles, thus favoring the activation of Na+/K+ pump; and 3) cAMP, in effect, suppresses the Na+/H+ exchange mechanism in the luminal membrane and transiently blocks the proximal urinary acidification.
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Affiliation(s)
- M Fujimoto
- Department of Physiology, Osaka Medical College, Japan
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28
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Nishihata T, Kotera K, Nakano Y, Yamazaki M. Rat percutaneous transport of diclofenac and influence of hydrogenated soya phospholipids. Chem Pharm Bull (Tokyo) 1987; 35:3807-12. [PMID: 3435976 DOI: 10.1248/cpb.35.3807] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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29
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Nate H, Sekine Y, Oda K, Aoe K, Nakai H, Wada H, Takeda M, Kotera K, Yabana H, Nagao T. Synthesis of 2-phenylthiazolidine derivatives as cardiotonic agents. III. Optically active isomers of N-methyl-2-(2-(2-(4-phenylpiperazino)ethoxy)phenyl)thiazolidine -3-carboxamides. Chem Pharm Bull (Tokyo) 1987; 35:2412-8. [PMID: 3664838 DOI: 10.1248/cpb.35.2412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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30
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Otsuka M, Kurozumi T, Furuuchi S, Usuki S, Kotera K, Harigaya S. Metabolism of afloqualone, a new centrally acting muscle relaxant, in the rat. Chem Pharm Bull (Tokyo) 1983; 31:2438-50. [PMID: 6640807 DOI: 10.1248/cpb.31.2438] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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31
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Miwatani T, Takeda Y, Kotera K, Nishimura T, Takashima T, Hiromatsu K, Tabuki K, Fujimoto S, Kamiki T, Yoshizaki E, Yabuuchi E, Shimizu Y, Matsunaga K, Yamanaka K, Furuta I, Iimori M, Kodama J, Tanaka M, Maejima K, Nukina M, Takashima E, Takahashi M, Harikane O, Masutani T. [The antibacterial activity of new cephem antibiotics against clinical isolates. A comparison of the antibacterial activity of cefotaxime with 6 other antibiotics]. Jpn J Antibiot 1983; 36:260-76. [PMID: 6304368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
During the period from May through July 1981, a comparative study was carried out on the antibacterial activities of cefotaxime (CTX) and ceftizoxime (CZX), cefoperazone (CPZ), latamoxef (LMOX), cefotiam (CTM), cefmetazole (CMZ) and cefazolin (CEZ). CTX and these other cephem antibiotics were tested against fresh clinical isolates which had been obtained from clinical materials by the laboratories of 14 participating medical institutions. 1. The clinical isolates were obtained from various clinical materials in the following decreasing order: urine, sputum and pus/discharge; 85.7% of the isolates came from these materials. 2. Concerning the sources of each species of clinical isolates, it was found that P. aeruginosa was isolated from the greatest number -9- of different clinical materials. This was followed by E. coli and E. cloacae, each isolated from 8 different clinical materials, and C. freundii and E. aerogenes, each found in 7 different clinical materials. 3. In relation to S. pyogenes, S. agalactiae and S. pneumoniae, CTX showed the best antibacterial activity; the second most potent antibiotic was CZX. CMZ and LMOX were found to show relatively high MIC values for those species. Against S. aureus, CEZ showed the best antibacterial activity, but 3 resistant strains had MICs of greater than 100 micrograms/ml. 4. With regard to Gram-negative bacteria, CTX and CZX showed the best antibacterial activities for all of the species, except for P. aeruginosa. These were followed, in order, by LMOX and CPZ. Compared with these 4 antibiotics, CTM, CMZ and CEZ were found to have inferior antibacterial activities against these bacteria. In relation to P. aeruginosa, the peak of the MIC distribution for CPZ was 6.25 micrograms/ml, and this was the best antibacterial activity detected with the various antibiotics tested. This was followed by CTX (25 micrograms/ml) LMOX (25 micrograms/ml) and CZX (50 micrograms/ml). CTM had an MIC of 100 micrograms/ml for 1 strain, and MICs of greater than 100 micrograms/ml for all of the other strains of P. aeruginosa, indicating them to be resistant to this antibiotic. All of the strains were resistant to CMZ and CEZ, showing MICs of greater than 100 micrograms/ml. 5. For each of the tested antibiotics, no correlation was found between the MIC and the serogroup for either P. aeruginosa or S. marcescens.
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Yamada K, Takeda M, Itoh N, Umino N, Ikezawa K, Kiyomoto A, Aoe K, Kotera K, Iwakuma T. Studies on 1,2,3,4-tetrahydroisoquinolines. IV. beta-Adrenoceptor activity and absolute stereochemistry of (-)-5,7-dihydroxy-1-(3,4,5-trimethoxybenzyl)-1,2,3,4-tetrahydroisoquinoline. Chem Pharm Bull (Tokyo) 1982; 30:1588-93. [PMID: 6288275 DOI: 10.1248/cpb.30.1588] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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33
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Fujimoto M, Kotera K. [Role of the kidney in regulation of Ca and P metabolism]. Nihon Rinsho 1982; 40:2577-2587. [PMID: 7161885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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34
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Tokuda H, Amano R, Matsuda H, Nejime K, Tazawa Y, Shimada K, Uchida Y, Yamanishi R, Kotera K. [The effect of dibekacin in the treatment of external ocular infections, with special reference to the pseudomonas infection of the eye (author's transl)]. Nippon Ganka Gakkai Zasshi 1981; 85:2126-37. [PMID: 7342734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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35
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Fujimoto M, Matsumura Y, Kajino K, Satake N, Aoki S, Morimoto Y, Kotera K. [Hydrogen ion transport mechanism in the kidney]. Nihon Rinsho 1981; 39:3390-7. [PMID: 7334623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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36
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Kotera K. [Causative bacteria of recent external infections of the eye (author's transl)]. Nippon Ganka Gakkai Zasshi 1981; 85:419-25. [PMID: 7293856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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37
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Suzuki T, Kohno T, Takeyama S, Kotera K, Tsubaki K. Analysis of gas chromatography/electron capture detector sensitive substances in human serum in relation to the determination of iodochlorhydroxyquin concentration. Clin Chim Acta 1980; 100:75-9. [PMID: 6444282 DOI: 10.1016/0009-8981(80)90189-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
We found that human sera can be divided into five types depending on the gas chromatography/electron capture detector (GC/ECD) chromatogram pattern. A preliminary GC/MS study on one of the GC/ECD peaks has suggested the presence of a hitherto unknown iodine-containing substance of probably endogenous origin.
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38
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Kubota T, Honda M, Kotera K, Fujimoto M. The effect of diffusible ions on the peritubular membrane potential of proximal tubular cells in perfused bullfrog kidneys. Jpn J Physiol 1980; 30:775-90. [PMID: 6970293 DOI: 10.2170/jjphysiol.30.775] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Effects of extracellular diffusible ions, such as K+, Cl- and HCO3- (pH), on the peritubular membrane potential (EM) and intracellular activities of K+, (K)i, or Cl-, (Cl)i, were studied in the perfused proximal tubule of bullfrog kidneys with K+ or Cl- -selective microelectrodes. In steady-state conditions, in which both the peritubular and luminal sides were perfused with control Ringer solutions, the K+ equilibrium potential (EK) always exceeded the EM by approximately 19 mV and correlated well with the EM (correlation coefficient r = 0.78), whereas no correlation was recognized between the equilibrium potential of Cl-(ECl) and the EM. In the quick peritubular perfusion experiments, in which the extracellular diffusible ions were changed, the (K)i and (Cl)i were maintained relatively stable. The following facts were observed: (1) At constant EK, decreasing the peritubular chloride (Cl)e produced a small degree of hyperpolarization of the EM instead of depolarization. (2) At constant ECl, increasing the (K)e depolarized the EM. (3) At constant PCO2, the EM was depolarized with low HCO3- (acid) perfusions, while it was hyperpolarized with high HCO3- (alkaline) perfusions. These results are in agreement with the views that, 1) intracellular K+ in the proximal tubule is maintained by an uphill uptake mechanism on the peritubular cell membrane, (2) the ionic conductance of peritubular membrane is relatively high to K+, but low to Cl-, and (3) the pH gradient across the peritubular membrane can modulate the passive permeability to Na+ or K+.
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Kotera K, Satake N, Honda M, Fujimoto M. The measurement of intracellular sodium activities in the bullfrog by means of double-barreled sodium liquid ion-exchanger microelectrodes. Membr Biochem 1979; 2:323-38. [PMID: 42004 DOI: 10.3109/09687687909063870] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A double-barreled Na+-selective microelectrode was constructed with monensin as a liquid ion exchanger. The HCl-treated monensin was dissolved in a solvent (Corning 477317) at 10% (weight/weight). Internal reference solution of its ionic barrel was mixture of 0.49 M NaCl and 0.01 M KCl, the pH being adjusted to 3 with 0.1 M citrate-HCl buffer, whereas that of the PD barrel was 0.5 M KCl. Average slope and selectivity ratio (Na+/K+) tested on 10 different microelectrodes were -57.5 +/- 1.87 mV/P(Na) (SEM) and 6.7 +/- 0.44, respectively. The electrical resistance was an order of 10(10) ohm and the response time was less than 10 sec. Using this microelectrode, a free flow micropuncture experiment was carried out in the bullfrog kidney and the intracellular Na+ activity as well as the membrane PD was determined on the proximal tubular cell. Average value (+/- SEM, n = 15) for the intracellular Na+ and K+ was 20.7 +/- 1.56 mEq/L and 61.2 +/- 1.16 mEq/L, respectively, and -68.7 +/- 0.88 mV for the peritubular membrane PD. There was a significant negative correlation between Na+ and K+ activities within the cell, i.e., the lower the ionic activity of cellular Na+ was, the higher the cellular K+, and vice versa, the sum of these two being kept nearly constant. The above finding may be somehow related to the isosmosis in the reabsorptive process across the proximal tubular epithelium.
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40
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Date T, Aoe K, Kotera K, Umino K. Studies on pentenomycins. III. The X-ray crystal structure analysis of monobromopentenomycin triacetate. Chem Pharm Bull (Tokyo) 1974; 22:1963-7. [PMID: 4452200 DOI: 10.1248/cpb.22.1963] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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41
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Kotera K, Azurin JC, Ogonuki H, Uylanco CV, Kobari K. Isolation of the L-form of Vibrio cholerae from clinical specimens in the Philippines. Biken J 1972; 15:115-21. [PMID: 4643689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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42
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Chibata I, Okumura K, Takeyama S, Kotera K. Lentinacin: a new hypocholesterolemic substance in Lentinus edodes. Experientia 1969; 25:1237-8. [PMID: 5391883 DOI: 10.1007/bf01897467] [Citation(s) in RCA: 101] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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43
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44
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Kitahonoki K, Takano Y, Matsuura A, Kotera K. Stereochemistry of aziridine formation from ketoximes of bridged ring systems by lithium aluminum hydride reduction on benzobicylo[3.2.1]octenone oximes. Tetrahedron 1969. [DOI: 10.1016/s0040-4020(01)82628-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Kotera K, Hamada Y, Mitsui R. The Amaryllidaceae alkaloids. Absolute confuigurations diasteroisomeric methiodides in the lycorine-type alkaloids. Tetrahedron 1968; 24:2463-79. [PMID: 5641273 DOI: 10.1016/s0040-4020(01)82518-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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46
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47
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Kotera K, Matsukawa Y, Takahashi H, Okada T, Kitahonoki K. Aziridine formation by reduction of ketoximes with lithium aluminium hydride. Tetrahedron 1968. [DOI: 10.1016/s0040-4020(01)96350-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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48
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Kotera K, Motomura M, Miyazaki S, Okada T, Matsukawa Y. Aziridine formation by lithium aluminum hydride reduction of dibenzo[a.c.]cycloheptadien-6-one oxime. Tetrahedron 1968. [DOI: 10.1016/s0040-4020(01)82479-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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49
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Kotera K, Okada T, Miyazaki S. Stereochemistry of aziridine formation by reduction of oximes with lithium aluminum hydride on aralkyl alkyl ketoximes and their tosylates. Tetrahedron 1968. [DOI: 10.1016/0040-4020(68)88166-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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50
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Kuriyama K, Iwata T, Moriyama M, Kotera K, Hamada Y, Mitsui R, Takeda K. The optical rotatory behaviour of lycorine and related compounds. ACTA ACUST UNITED AC 1967. [DOI: 10.1039/j29670000046] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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