Year: 2004
Type: article
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 $A=\ensuremath{-}15.05\ifmmode\pm\else\textpm\fi{}0.98(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.56(\mathrm{syst})\phantom{\rule{0.3em}{0ex}}\mathrm{ppm}$ at the kinematic point $⟨{\ensuremath{\theta}}_{\mathrm{lab}}⟩=12.3\ifmmode^\circ\else\textdegree\fi{}$ and $⟨{Q}^{2}⟩=0.477\phantom{\rule{0.3em}{0ex}}{(\mathrm{GeV}∕c)}^{2}$. Based on these data as well as data on electromagnetic form factors, we extract the linear combination of strange form factors ${G}_{E}^{s}+0.392{G}_{M}^{s}=0.014\ifmmode\pm\else\textpm\fi{}0.020\ifmmode\pm\else\textpm\fi{}0.010$, 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.
Source: Physical Review C
Authors: 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. Ewell, N. 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
Institutions: California State University Los Angeles, William & Mary, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Thomas Jefferson National Accelerator Facility, CEA Paris-Saclay, University of New Hampshire, Princeton University, University of Virginia, Massachusetts Institute of Technology, University of Maryland, College Park, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Florida International University, University of Kentucky, University of Regina, Hampton University, Rutgers, The State University of New Jersey, Kharkiv Institute of Physics and Technology, Syracuse University, Temple University, Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, Old Dominion University, Kyungpook National University, Kent State University, University of Massachusetts Amherst, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, University of Bari Aldo Moro, Stony Brook University, Eastern Kentucky University, Université Joseph Fourier, Norfolk State University, Institut National de Physique Nucléaire et de Physique des Particules, Université Blaise Pascal, TRIUMF, Harvard University, University of Georgia, Tohoku University, North Carolina Central University
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2988778103, G4982175812, G8329594714
OpenAlex ID: W1994459282