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Abstract
Abstract
Inelastic electron scattering from Ce (50 and 65 MeV, 93°, 129° and 165°) had shown evidence for an Ml and an E2 resonance at 8.7 and 12.0 MeV, respectively. These assignments have been confirmed by DWBA calculations. Reduced transition probabilities are derived for the resonances mentioned, and for the giant E1 resonance.
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Affiliation(s)
- R. Pitthan
- Institut für Technische Kernphysik, Technischen Hochschule Darmstadt, Germany (BRD)
| | - Th. Walcher
- Institut für Technische Kernphysik, Technischen Hochschule Darmstadt, Germany (BRD)
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Alexander G, Barley J, Batygin Y, Berridge S, Bharadwaj V, Bower G, Bugg W, Decker FJ, Dollan R, Efremenko Y, Gharibyan V, Hast C, Iverson R, Kolanoski H, Kovermann J, Laihem K, Lohse T, McDonald KT, Mikhailichenko AA, Moortgat-Pick GA, Pahl P, Pitthan R, Pöschl R, Reinherz-Aronis E, Riemann S, Schälicke A, Schüler KP, Schweizer T, Scott D, Sheppard JC, Stahl A, Szalata ZM, Walz D, Weidemann AW. Observation of polarized positrons from an undulator-based source. Phys Rev Lett 2008; 100:210801. [PMID: 18518594 DOI: 10.1103/physrevlett.100.210801] [Citation(s) in RCA: 4] [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: 03/08/2008] [Indexed: 05/26/2023]
Abstract
An experiment (E166) at the Stanford Linear Accelerator Center has demonstrated a scheme in which a multi-GeV electron beam passed through a helical undulator to generate multi-MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80% at 6 MeV. The results are in agreement with GEANT4 simulations that include the dominant polarization-dependent interactions of electrons, positrons, and photons in matter.
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Anthony PL, Arnold RG, Arroyo C, Bega K, Biesiada J, Bosted PE, Bower G, Cahoon J, Carr R, Cates GD, Chen JP, Chudakov E, Cooke M, Decowski P, Deur A, Emam W, Erickson R, Fieguth T, Field C, Gao J, Gary M, Gustafsson K, Hicks RS, Holmes R, Hughes EW, Humensky TB, Jones GM, Kaufman LJ, Keller L, Kolomensky YG, Kumar KS, LaViolette P, Lhuillier D, Lombard-Nelsen RM, Marshall Z, Mastromarino P, McKeown RD, Michaels R, Niedziela J, Olson M, Paschke KD, Peterson GA, Pitthan R, Relyea D, Rock SE, Saxton O, Singh J, Souder PA, Szalata ZM, Turner J, Tweedie B, Vacheret A, Walz D, Weber T, Weisend J, Woods M, Younus I. Precision measurement of the weak mixing angle in Møller scattering. Phys Rev Lett 2005; 95:081601. [PMID: 16196849 DOI: 10.1103/physrevlett.95.081601] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2005] [Indexed: 05/04/2023]
Abstract
We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV) = [-131 +/- 14(stat) +/- 10(syst)] x 10(-9), leading to the determination of the weak mixing angle sin2(thetaW(eff) = 0.2397 +/- 0.0010(stat) +/- 0.0008(syst), evaluated at Q2 = 0.026 GeV2. Combining this result with the measurements of sin2(thetaW(eff) at the Z0 pole, the running of the weak mixing angle is observed with over 6sigma significance. The measurement sets constraints on new physics effects at the TeV scale.
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Affiliation(s)
- P L Anthony
- Stanford Linear Accelerator Center, Menlo Park, California 94025, USA
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Anthony PL, Arnold RG, Arroyo C, Baird K, Bega K, Biesiada J, Bosted PE, Breuer M, Carr R, Cates GD, Chen JP, Chudakov E, Cooke M, Decker FJ, Decowski P, Deur A, Emam W, Erickson R, Fieguth T, Field C, Gao J, Gustafsson K, Hicks RS, Holmes R, Hughes EW, Humensky TB, Jones GM, Kaufman LJ, Kolomensky YG, Kumar KS, Lhuillier D, Lombard-Nelsen R, Mastromarino P, Mayer B, McKeown RD, Michaels R, Olson M, Paschke KD, Peterson GA, Pitthan R, Pope K, Relyea D, Rock SE, Saxton O, Shapiro G, Singh J, Souder PA, Szalata ZM, Tobias WA, Tonguc BT, Turner J, Tweedie B, Vacheret A, Walz D, Weber T, Weisend J, Whittum D, Woods M, Younus I. Observation of parity nonconservation in møller scattering. Phys Rev Lett 2004; 92:181602. [PMID: 15169482 DOI: 10.1103/physrevlett.92.181602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2003] [Indexed: 05/24/2023]
Abstract
We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV)=[-175+/-30(stat)+/-20(syst)] x 10(-9). This first direct observation of parity nonconservation in Møller scattering leads to a measurement of the electron's weak charge at low energy Q(e)(W)=-0.053+/-0.011. This is consistent with the standard model expectation at the current level of precision: sin((2)theta(W)(M(Z))((-)MS)=0.2293+/-0.0024(stat)+/-0.0016(syst)+/-0.0006(theory).
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Affiliation(s)
- P L Anthony
- Stanford Linear Accelerator Center, Menlo Park, CA 94025, USA
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Anthony PL, Arnold RG, Band HR, Borel H, Bosted PE, Breton V, Cates GD, Chupp TE, Dietrich FS, Dunne J, Erbacher R, Fellbaum J, Fonvieille H, Gearhart R, Holmes R, Hughes EW, Johnson JR, Kawall D, Keppel C, Kuhn SE, Lombard-Nelsen RM, Marroncle J, Maruyama T, Meyer W, Meziani Z, Middleton H, Morgenstern J, Newbury NR, Petratos GG, Pitthan R, Prepost R, Roblin Y, Rock SE, Rokni SH, Shapiro G, Smith T, Souder PA, Spengos M, Staley F, Stuart LM, Szalata ZM, Terrien Y, Thompson AK, White JL, Woods M, Xu J, Young CC, Zapalac G. Deep inelastic scattering of polarized electrons by polarized 3He and the study of the neutron spin structure. Phys Rev D Part Fields 1996; 54:6620-6650. [PMID: 10020671 DOI: 10.1103/physrevd.54.6620] [Citation(s) in RCA: 209] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abe K, Akagi T, Anthony PL, Antonov R, Arnold RG, Averett T, Band HR, Bauer JM, Borel H, Bosted PE, Breton V, Button-Shafer J, Chen JP, Chupp TE, Clendenin J, Comptour C, Coulter KP, Court G, Crabb D, Daoudi M, Day D, Dietrich FS, Dunne J, Dutz H, Erbacher R, Fellbaum J, Feltham A, Fonvieille H, Frlez E, Garvey D, Gearhart R, Gomez J, Grenier P, Griffioen KA, Hoibraten S, Hughes EW, Hyde-Wright C, Johnson JR, Kawall D, Klein A, Kuhn SE, Kuriki M, Lindgren R, Liu TJ, Lombard-Nelsen RM, Marroncle J, Maruyama T, Maruyama XK, McCarthy J, Meyer W, Meziani Z, Minehart R, Mitchell J, Morgenstern J, Petratos GG, Pitthan R, Pocanic D, Prescott C, Prepost R, Raines P, Raue B, Reyna D, Rijllart A, Roblin Y. Measurements of the proton and deuteron spin structure function g2 and asymmetry A2. Phys Rev Lett 1996; 76:587-591. [PMID: 10061497 DOI: 10.1103/physrevlett.76.587] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abe K, Akagi T, Anthony PL, Antonov R, Arnold RG, Averett T, Band HR, Bauer JM, Borel H, Bosted PE, Breton V, Button-Shafer J, Chen JP, Chupp TE, Clendenin J, Comptour C, Coulter KP, Court G, Crabb D, Daoudi M, Day D, Dietrich FS, Dunne J, Dutz H, Erbacher R, Fellbaum J, Feltham A, Fonvieille H, Frlez E, Garvey D, Gearhart R, Gomez J, Grenier P, Griffioen KA, Hoibraten S, Hughes EW, Hyde-Wright C, Johnson JR, Kawall D, Klein A, Kuhn SE, Kuriki M, Lindgren R, Liu T, Lombard-Nelsen RM, Marroncle J, Maruyama T, Maruyama XK, McCarthy J, Meyer W, Meziani Z, Minehart R, Mitchell J, Morgenstern J, Petratos GG, Pitthan R, Pocanic D, Prescott C, Prepost R, Raines P, Raue B, Reyna D, Rijllart A, Roblin Y. Precision measurement of the deuteron spin structure function gd1. Phys Rev Lett 1995; 75:25-28. [PMID: 10059106 DOI: 10.1103/physrevlett.75.25] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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8
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Abe K, Akagi T, Anthony PL, Antonov R, Arnold RG, Averett T, Band HR, Bauer JM, Borel H, Bosted PE, Breton V, Button-Shafer J, Chen JP, Chupp TE, Clendenin J, Comptour C, Coulter KP, Court G, Crabb D, Daoudi M, Day D, Dietrich FS, Dunne J, Dutz H, Erbacher R, Fellbaum J, Feltham A, Fonvieille H, Frlez E, Garvey D, Gearhart R, Gomez J, Grenier P, Griffioen KA, Hoibraten S, Hughes EW, Hyde-Wright C, Johnson JR, Kawall D, Klein A, Kuhn SE, Kuriki M, Lindgren R, Liu TJ, Lombard-Nelsen RM, Marroncle J, Maruyama T, Maruyama XK, McCarthy J, Meyer W, Meziani Z, Minehart R, Mitchell J, Morgenstern J, Petratos GG, Pitthan R, Pocanic D, Prescott C, Prepost R, Raines P, Raue B, Reyna D, Rijllart A, Roblin Y. Precision measurement of the proton spin structure function gp1. Phys Rev Lett 1995; 74:346-350. [PMID: 10058735 DOI: 10.1103/physrevlett.74.346] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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9
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Anthony PL, Arnold RG, Band HR, Borel H, Bosted PE, Breton V, Cates GD, Chupp TE, Dietrich FS, Dunne J, Erbacher R, Fellbaum J, Fonvieille H, Gearhart R, Holmes R, Hughes EW, Johnson JR, Kawall D, Keppel C, Kuhn SE, Lombard-Nelsen RM, Marroncle J, Maruyama T, Meyer W, Meziani Z, Middleton H, Morgenstern J, Newbury NR, Petratos GG, Pitthan R, Prepost R, Roblin Y, Rock SE, Rokni SH, Shapiro G, Smith T, Souder PA, Spengos M, Staley F, Stuart LM, Szalata ZM, Terrien Y, Thompson AK, White JL, Woods M, Xu J, Young CC, Zapalac G. Determination of the neutron spin structure function. Phys Rev Lett 1993; 71:959-962. [PMID: 10055413 DOI: 10.1103/physrevlett.71.959] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Klem DE, Atwood WB, Barish BC, Bonneaud GR, Courau A, Donaldson GJ, Dubois R, Duro MM, Elsen EE, Gao SG, Huang YZ, Irwin GM, Johnson RP, Kichimi H, Kirkby J, Koop DE, Ludwig J, Mills GB, Ogawa A, Pal T, Pitthan R, Pollard DL, Prescott CY, Rochester LS, Ruckstuhl W, Sakuda M, Sherman SS, Stroynowski R, Wang SQ, Wojcicki SG, Yamamoto H, Yan WG, Young CC. Measurement of the average lifetime of hadrons containing bottom quarks. Phys Rev D Part Fields 1988; 37:41-51. [PMID: 9958517 DOI: 10.1103/physrevd.37.41] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ruckstuhl W, Stroynowski R, Atwood WB, Barish BC, Bonneaud GR, Courau A, Donaldson GJ, Dubois R, Duro MM, Elsen EE, Gao SG, Huang YZ, Irwin GM, Johnson RP, Kichimi H, Kirkby J, Klem DE, Koop DE, Ludwig J, Mills GB, Ogawa A, Pal T, Pitthan R, Pollard DL, Prescott CY, Rochester LS, Sakuda M, Sherman SS, Wang SQ, Wojcicki SG, Yamamoto H, Yan WG, Young CC. Study of three-prong tau decays and determination of the A1 parameters. Phys Rev Lett 1986; 56:2132-2135. [PMID: 10032899 DOI: 10.1103/physrevlett.56.2132] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Pal T, Atwood WB, Barish BC, Bonneaud GR, Courau A, Donaldson GJ, Dubois R, Duro MM, Elsen EE, Gao SG, Huang YZ, Irwin GM, Johnson RP, Kichimi H, Kirkby J, Klem DE, Koop DE, Ludwig J, Mills GB, Ogawa A, Pitthan R, Pollard DL, Prescott CY, Rochester LS, Ruckstuhl W, Sakuda M, Sherman SS, Stroynowski R, Wang SQ, Wojcicki SG, Yamamoto H, Yan WG, Young CC. Prompt electron production from the DELCO detector at the SLAC storage ring PEP. Phys Rev D Part Fields 1986; 33:2708-2710. [PMID: 9956958 DOI: 10.1103/physrevd.33.2708] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Yamamoto H, Atwood WB, Baillon PH, Barish BC, Bonneaud GR, Courau A, Donaldson GJ, Dubois R, Duro MM, Elsen EE, Gao SG, Huang YZ, Irwin GM, Johnson R, Kichimi H, Kirkby J, Klem DE, Koop DE, Ludwig J, Mills GB, Ogawa A, Pal T, Perret-Gallix D, Pitthan R, Pollard DL, Prescott CY, Rivkin LZ, Rochester LS, Ruckstuhl W, Sakuda M, Sherman S, Siskind EJ, Stroynowski R, Wang SQ, Wojcicki SG, Yan WG, Young CC. Measurement of D0 lifetime in e+e- annihilation at high energy. Phys Rev D Part Fields 1985; 32:2901-2910. [PMID: 9956072 DOI: 10.1103/physrevd.32.2901] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Mills GB, Pal T, Atwood WB, Baillon PH, Barish BC, Bonneaud GR, Courau A, Donaldson GJ, Dubois R, Duro MM, Elsen EE, Gao SG, Huang YZ, Irwin GM, Johnson RP, Kichimi H, Kirkby J, Klem DE, Koop DE, Ludwig J, Ogawa A, Perret-Gallix D, Pitthan R, Pollard DL, Prescott CY, Rivkin LZ, Rochester LS, Ruckstuhl W, Sakuda M, Sherman SS, Siskind EJ, Stroynowski R, Wang SQ, Wojcicki SG, Yamamoto H, Yan WG, Young CC. Upper bound on the tau -neutrino mass from the previously unobserved decay mode tau -->KK pi nu tau. Phys Rev Lett 1985; 54:624-627. [PMID: 10031573 DOI: 10.1103/physrevlett.54.624] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Yamamoto H, Atwood WB, Baillon PH, Barish BC, Bonneaud GR, Courau A, Donaldson GJ, Dubois R, Duro MM, Elsen EE, Gao SG, Huang YZ, Irwin GM, Johnson R, Kichimi H, Kirkby J, Klem DE, Koop DE, Ludwig J, Mills GB, Ogawa A, Pal T, Perret-Gallix D, Pitthan R, Pollard DL, Prescott CY, Rivkin LZ, Rochester LS, Ruckstuhl W, Sakuda M, Sherman S, Siskind EJ, Stroynowski R, Wang SQ, Wojcicki SG, Yan WG, Young CC. Charged D production in e+e- annihilation at 29 GeV and a limit on D0-D-bar 0 mixing. Phys Rev Lett 1985; 54:522-525. [PMID: 10031540 DOI: 10.1103/physrevlett.54.522] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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