New measurement of parity violation in elastic electron-proton scattering and implications for strange form factors

K. A. Aniol, D. S. Armstrong, T. Averett, M. Baylac, E. Burtin, J. Calarco, G. D. Cates, C. Cavata, Z. Chai, C. C. Chang, J. P. Chen, E. Chudakov, E. Cisbani, M. Coman, D. Dale, A. Deur, P. Djawotho, M. B. Epstein, S. Escoffier, L. EwellN. Falletto, J. M. Finn, A. Fleck, B. Frois, S. Frullani, J. Gao, F. Garibaldi, A. Gasparian, G. M. Gerstner, R. Gilman, A. Glamazdin, J. Gomez, V. Gorbenko, O. Hansen, F. Hersman, D. W. Higinbotham, R. Holmes, M. Holtrop, B. Humensky, S. Incerti, M. Iodice, C. W. de Jager, J. Jardillier, X. Jiang, M. K. Jones, J. Jorda, C. Jutier, W. Kahl, J. J. Kelly, D. H. Kim, M. J. Kim, M. S. Kim, I. Kominis, E. Kooijman, K. Kramer, K. S. Kumar, M. Kuss, J. LeRose, R. de Leo, M. Leuschner, D. Lhuillier, M. Liang, N. Liyanage, R. Lourie, R. Madey, S. Malov, D. J. Margaziotis, F. Marie, P. Markowitz, J. Martino, P. Mastromarino, K. McCormick, J. McIntyre, Z. E. Meziani, R. Michaels, B. Milbrath, G. W. Miller, J. Mitchell, L. Morand, D. Neyret, G. G. Petratos, R. Pomatsalyuk, J. S. Price, D. Prout, T. Pussieux, G. Quéméner, R. D. Ransome, D. Relyea, Y. Roblin, J. Roche, G. A. Rutledge, P. M. Rutt, M. Rvachev, F. Sabatie, A. Saha, P. A. Souder, M. Spradlin, S. Strauch, R. Suleiman, J. Templon, T. Teresawa, J. Thompson, R. Tieulent, L. Todor, B. T. Tonguc, P. E. Ulmer, G. M. Urciuoli, B. Vlahovic, K. Wijesooriya, R. Wilson, B. Wojtsekhowski, R. Woo, W. Xu, I. Younus, C. Zhang

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101 Scopus citations


We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The result is A = -15.05 ± 0.98(stat) ± 0.56(syst) ppm at the kinematic point (θlab) = 12.3° and (Q2) = 0.477 (Ge V/c)2. Both errors are a factor of two smaller than those of the result reported previously. The value for the strange form factor extracted from the data is (GS E + 0.392 GS M) = 0.025 ± 0.020 ± 0.014, where the first error is experimental and the second arises from the uncertainties in electromagnetic form factors. This measurement is the first fixed-target parity violation experiment that used either a "strained" GaAs photocathode to produce highly polarized electrons or a Compton polarimeter to continuously monitor the electron beam polarization.

Original languageEnglish (US)
Pages (from-to)211-216
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - Jul 14 2001

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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