Parity-violating electroweak asymmetry in e→p scattering

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, K. Fissum, 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, T. 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, C. Pedrisat, G. G. Petratos, R. Pomatsalyuk, J. S. Price, D. Prout, V. Punjabi, 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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Abstract

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from protons. Significant contributions to this asymmetry could arise from the contributions of strange form factors in the nucleon. The measured asymmetry is A=-15.05±0.98(stat)±0.56(syst) ppm at the kinematic point 〈θlab〉=12.3° and 〈Q2〉=0.477 (GeV/c)2. Based on these data as well as data on electromagnetic form factors, we extract the linear combination of strange form factors GEs+0.392GM s=0.014±0.020±0.010, where the first error arises from this experiment and the second arises from the electromagnetic form factor data. This paper provides a full description of the special experimental techniques employed for precisely measuring the small asymmetry, including the first use of a strained GaAs crystal and a laser-Compton polarimeter in a fixed target parity-violation experiment.

Original languageEnglish (US)
Article number065501
Pages (from-to)065501-1-065501-35
JournalPhysical Review C - Nuclear Physics
Volume69
Issue number6
DOIs
StatePublished - Jun 2004

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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  • Cite this

    Aniol, K. A., Armstrong, D. S., Averett, T., Baylac, M., Burtin, E., Calarco, J., Cates, G. D., Cavata, C., Chai, Z., Chang, C. C., Chen, J. P., Chudakov, E., Cisbani, E., Coman, M., Dale, D., Deur, A., Djawotho, P., Epstein, M. B., Escoffier, S., ... Zhang, C. (2004). Parity-violating electroweak asymmetry in e→p scattering. Physical Review C - Nuclear Physics, 69(6), 065501-1-065501-35. [065501]. https://doi.org/10.1103/PhysRevC.69.065501