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Shirotori K, Takahashi TN, Adachi S, Agnello M, Ajimura S, Aoki K, Bhang HC, Bassalleck B, Botta E, Bufalino S, Chiga N, Evtoukhovitch P, Feliciello A, Fujioka H, Hiruma F, Honda R, Hosomi K, Ichikawa Y, Ieiri M, Igarashi Y, Imai K, Ishibashi N, Ishimoto S, Itahashi K, Iwasaki R, Joo CW, Kim MJ, Kim SJ, Kiuchi R, Koike T, Komatsu Y, Kulikov VV, Marcello S, Masumoto S, Matsuoka K, Miwa K, Moritsu M, Nagae T, Naruki M, Niiyama M, Noumi H, Ozawa K, Saito N, Sakaguchi A, Sako H, Samoilov V, Sato M, Sato S, Sato Y, Sawada S, Sekimoto M, Sugimura H, Suzuki S, Takahashi H, Takahashi T, Tamura H, Tanaka T, Tanida K, Tokiyasu AO, Tomida N, Tsamalaidze Z, Ukai M, Yagi K, Yamamoto TO, Yang SB, Yonemoto Y, Yoon CJ, Yoshida K. Search for the Θ+ pentaquark via the π(-)p→K(-)X reaction at 1.92 GeV/c. Phys Rev Lett 2012; 109:132002. [PMID: 23030084 DOI: 10.1103/physrevlett.109.132002] [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: 03/15/2012] [Indexed: 06/01/2023]
Abstract
The Θ(+) pentaquark baryon was searched for via the π(-)p→K(-)X reaction with a missing mass resolution of 1.4 MeV/c(2) (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). π(-) meson beams were incident on the liquid hydrogen target with a beam momentum of 1.92 GeV/c. No peak structure corresponding to the Θ(+) mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2° to 15° in the laboratory frame is obtained to be 0.26 μb/sr in the mass region of 1.51-1.55 GeV/c(2). The upper limit of the Θ(+) decay width is obtained to be 0.72 and 3.1 MeV for J(Θ)(P)=1/2(+) and J(Θ)(P)=1/2(-), respectively, using the effective Lagrangian approach.
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Affiliation(s)
- K Shirotori
- Department of Physics, Tohoku University, Sendai, Japan.
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Groote S, Körner JG, Pivovarov AA. Calculating loops without loop calculations: Next-to-leading order computation of pentaquark correlators. Int J Clin Exp Med 2012. [DOI: 10.1103/physrevd.86.034023] [Citation(s) in RCA: 3] [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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Muramatsu N, Chen JY, Chang WC, Ahn DS, Ahn JK, Akimune H, Asano Y, Daté S, Ejiri H, Fujimura H, Fujiwara M, Fukui S, Hasegawa S, Hicks K, Horie K, Hotta T, Imai K, Ishikawa T, Iwata T, Kato Y, Kawai H, Kino K, Kohri H, Kumagai N, Makino S, Matsuda T, Matsumura T, Matsuoka N, Mibe T, Miyabe M, Miyachi M, Nakano T, Niiyama M, Nomachi M, Ohashi Y, Ohkuma H, Ooba T, Oshuev DS, Rangacharyulu C, Sakaguchi A, Shagin PM, Shiino Y, Shimizu H, Sugaya Y, Sumihama M, Toi Y, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Near-threshold photoproduction of Lambda(1520) from protons and deuterons. Phys Rev Lett 2009; 103:012001. [PMID: 19659135 DOI: 10.1103/physrevlett.103.012001] [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: 04/12/2009] [Indexed: 05/28/2023]
Abstract
Photoproduction of Lambda(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K+/0 angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K+ angles.
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Affiliation(s)
- N Muramatsu
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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Abstract
We study the low-lying baryon spectrum (up to 2.2 GeV) provided by experiments and different quark models using statistical tools which allow us to postulate the existence of missing levels in spectra. We confirm that the experimental spectrum is compatible with random matrix theory, the paradigmatic model of quantum chaos, and we find that the quark models are more similar to a Poisson distribution, which is not compatible with what should be expected in a correlated spectrum. From our analysis it stems that the spectral fluctuation properties of quark-model spectra are incompatible with experimental data. This result can be used to enlighten the problem of missing resonances.
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Affiliation(s)
- C Fernández-Ramírez
- Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid, Spain
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6
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Niccolai S, Mirazita M, Rossi P, Baltzell NA, Carman DS, Hicks K, McKinnon B, Mibe T, Stepanyan S, Tedeschi DJ, Adams G, Ambrozewicz P, Anefalos Pereira S, Anghinolfi M, Asryan G, Avakian H, Bagdasaryan H, Baillie N, Ball JP, Batourine V, Battaglieri M, Bedlinskiy I, Bektasoglu M, Bellis M, Benmouna N, Berman BL, Biselli AS, Boiarinov S, Bouchigny S, Bradford R, Branford D, Briscoe WJ, Brooks WK, Bültmann S, Burkert VD, Butuceanu C, Calarco JR, Careccia SL, Carnahan B, Chen S, Cole PL, Collins P, Coltharp P, Crabb D, Crannell H, Crede V, Cummings JP, Dashyan N, Degtyarenko PV, De Masi R, Deppman A, De Sanctis E, Deur A, Devita R, Dharmawardane KV, Djalali C, Dodge GE, Donnelly J, Doughty D, Dugger M, Dzyubak OP, Egiyan H, Egiyan KS, El Fassi L, Elouadrhiri L, Eugenio P, Fedotov G, Feldman G, Funsten H, Garçon M, Gavalian G, Gilfoyle GP, Giovanetti KL, Girod FX, Goetz JT, Gonenc A, Gordon CIO, Gothe RW, Griffioen KA, Guidal M, Guler N, Guo L, Gyurjyan V, Hadjidakis C, Hafidi K, Hakobyan H, Hakobyan RS, Hardie J, Hersman FW, Hleiqawi I, Holtrop M, Hyde-Wright CE, Ilieva Y, Ireland DG, Ishkhanov BS, Isupov EL, Ito MM, Jenkins D, Jo HS, Joo K, Juengst HG, Kellie JD, Khandaker M, Kim W, Klein A, Klein FJ, Klimenko AV, Kossov M, Kramer LH, Kubarovsky V, Kuhn J, Kuhn SE, Kuleshov SV, Lachniet J, Langheinrich J, Lawrence D, Lee T, Li J, Livingston K, Lu H, MacCormick M, Markov N, Mecking BA, Mellor J, Melone JJ, Mestayer MD, Meyer CA, Mikhailov K, Minehart R, Miskimen R, Mokeev V, Morand L, Morrow SA, Moteabbed M, Mutchler GS, Nadel-Turonski P, Napolitano J, Nasseripour R, Niculescu G, Niculescu I, Niczyporuk BB, Niroula MR, Niyazov RA, Nozar M, de Oliveira Echeimberg J, Osipenko M, Ostrovidov AI, Park K, Pasyuk E, Paterson C, Pierce J, Pivnyuk N, Pocanic D, Pogorelko O, Pozdniakov S, Preedom BM, Price JW, Prok Y, Protopopescu D, Raue BA, Riccardi G, Ricco G, Ripani M, Ritchie BG, Ronchetti F, Rosner G, Sabatié F, Salgado C, Santoro JP, Sapunenko V, Schumacher RA, Serov VS, Sharabian YG, Shvedunov NV, Smith ES, Smith LC, Sober DI, Stavinsky A, Stepanyan SS, Stokes BE, Stoler P, Strakovsky II, Strauch S, Taiuti M, Thoma U, Tkabladze A, Tkachenko S, Todor L, Tur C, Ungaro M, Vineyard MF, Vlassov AV, Watts DP, Weinstein LB, Weygand DP, Williams M, Wolin E, Wood MH, Yegneswaran A, Zana L, Zhang J, Zhao B, Zhao Z. Search for the Theta+ Pentaquark in the gammad--> DeltanK+ reaction measured with the CLAS spectrometer. Phys Rev Lett 2006; 97:032001. [PMID: 16907494 DOI: 10.1103/physrevlett.97.032001] [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: 04/26/2006] [Indexed: 05/11/2023]
Abstract
For the first time, the reaction gammad-->DeltanK+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant-mass distribution. The upper limit on the gammad-->DeltaTheta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.
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Affiliation(s)
- S Niccolai
- Institut de Physique Nucléaire, Orsay, France
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McKinnon B, Hicks K, Baltzell NA, Carman DS, Mestayer MD, Mibe T, Mirazita M, Niccolai S, Rossi P, Stepanyan S, Tedeschi DJ, Ambrozewicz P, Anghinolfi M, Asryan G, Avakian H, Bagdasaryan H, Baillie N, Ball JP, Batourine V, Battaglieri M, Bedlinskiy I, Bellis M, Benmouna N, Berman BL, Biselli AS, Bouchigny S, Boiarinov S, Bradford R, Branford D, Briscoe WJ, Brooks WK, Bültmann S, Burkert VD, Butuceanu C, Calarco JR, Careccia SL, Chen S, Cole PL, Collins P, Coltharp P, Crabb D, Crede V, Dale D, De Masi R, DeVita R, De Sanctis E, Degtyarenko PV, Deur A, Djalali C, Dodge GE, Donnelly J, Doughty D, Dugger M, Dzyubak OP, Egiyan H, Egiyan KS, Elouadrhiri L, Eugenio P, Fedotov G, Feldman G, Funsten H, Gabrielyan M, Gan L, Garçon M, Gasparian A, Gavalian G, Gilfoyle GP, Giovanetti KL, Girod FX, Goetz JT, Gonenc A, Gothe RW, Griffioen KA, Guidal M, Guler N, Guo L, Gyurjyan V, Hakobyan RS, Hersman FW, Hleiqawi I, Holtrop M, Hyde-Wright CE, Ilieva Y, Ireland DG, Ishkhanov BS, Ito MM, Jenkins D, Jo HS, Joo K, Juengst HG, Kellie JD, Khandaker M, Kim W, Klein A, Klein FJ, Kossov M, Kramer LH, Kubarovsky V, Kuhn J, Kuhn SE, Kuleshov SV, Lachniet J, Langheinrich J, Lawrence D, Livingston K, Lu H, MacCormick M, Mecking BA, Meyer CA, Mikhailov K, Miskimen R, Mokeev V, Morrow SA, Moteabbed M, Mutchler GS, Nakagawa I, Nadel-Turonski P, Nasseripour R, Niculescu G, Niculescu I, Niczyporuk BB, Niroula MR, Niyazov RA, Nozar M, Osipenko M, Ostrovidov AI, Park K, Pasyuk E, Paterson C, Pierce J, Pivnyuk N, Pogorelko O, Pozdniakov S, Price JW, Prok Y, Protopopescu D, Raue BA, Ricco G, Ripani M, Ritchie BG, Ronchetti F, Rosner G, Sabatié F, Salgado C, Santoro JP, Sapunenko V, Schumacher RA, Serov VS, Sharabian YG, Smith ES, Smith LC, Sober DI, Stavinsky A, Stepanyan SS, Stokes BE, Stoler P, Strakovsky II, Strauch S, Taiuti M, Teymurazyan A, Thoma U, Tkabladze A, Tkachenko S, Tur C, Ungaro M, Vineyard MF, Vlassov AV, Weinstein LB, Weygand DP, Williams M, Wolin E, Wood MH, Yegneswaran A, Zana L, Zhang J, Zhao B, Zhao Z. Search for the Theta+ pentaquark in the reaction gammad --> pK-K+n. Phys Rev Lett 2006; 96:212001. [PMID: 16803230 DOI: 10.1103/physrevlett.96.212001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2006] [Indexed: 05/10/2023]
Abstract
A search for the Theta+ in the reaction gammad --> pK-K+n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Theta+ resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Theta+ production in the mass range of 1.52-1.56 GeV/c2 for the gammad --> pK-Theta+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Theta+ production. Using Lambda(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary gamman --> K-Theta+ reaction is estimated to be a factor of 10 higher, i.e., approximately 3 nb (95% C.L.).
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Affiliation(s)
- B McKinnon
- University of Glasgow, Glasgow G12 8QQ, United Kingdom
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