Parity-Violating Electron Scattering fromHe4and the Strange Electric Form Factor of the Nucleon
Physical Review Letters2006Vol. 96(2), pp. 022003–022003
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K. Aniol, David Armstrong, T. Averett, H. Benaoum, P.Y. Bertin, E. Burtin, J.L. Cahoon, G. D. Cates, C. C. Chang, Yu-Chiu Chao, J. P. Chen, Seonho Choi, E. Chudakov, B. Craver, F. Cusanno, P. Decowski, D. Deepa, C. Ferdi, R. J. Feuerbach, J. M. Finn, S. Frullani, K. Fuoti, F. Garibaldi, R. Gilman, A. Glamazdin, V. Gorbenko, J. M. Grames, J. Hansknecht, D. W. Higinbotham, R. Holmes, T. Holmstrom, T. B. Humensky, H. Ibrahim, C. W. de Jager, X. Jiang, L. J. Kaufman, A. Kelleher, A. Kolarkar, S. Kowalski, K.S. Kumar, D. Lambert, Paul A. LaViolette, J. J. LeRose, D. Lhuillier, N. Liyanage, D. J. Margaziotis, M. Mazouz, K. McCormick, D. Meekins, Z.-E. Meziani, R. Michaels, B. Moffit, Peter Monaghan, C. Muñoz-Camacho, S. Nanda, V. Nelyubin, D. Neyret, K. Paschke, M. Poelker, R. Pomatsalyuk, Y. Qiang, B. Reitz, J. Roche, A. Saha, Jaideep Singh, R. Snyder, P. A. Souder, R. Subedi, R. Suleiman, V. Sulkosky, W. A. Tobias, G. M. Urciuoli, A. Vacheret, E. Voutier, K. Wang, R. J. Wilson, B. Wojtsekhowski, Xiaochao Zheng
Abstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from 4He at an average scattering angle = 5.7 degrees and a four-momentum transfer Q2 = 0.091 GeV2 . From these data, for the first time, the strange electric form factor of the nucleon G(E)s can be isolated. The measured asymmetry of A(PV) = (6.72 +/- 0.84(stat) +/- 0.21(syst) x 10(-6) yields a value of G(E)s = -0.038 +/- 0.042(stat) +/- 0.010(syst), consistent with zero.