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Aniol KA, Armstrong DS, Averett T, Benaoum H, Bertin PY, Burtin E, Cahoon J, Cates GD, Chang CC, Chao YC, Chen JP, Choi S, Chudakov E, Craver B, Cusanno F, Decowski P, Deepa D, Ferdi C, Feuerbach RJ, Finn JM, Frullani S, Fuoti K, Garibaldi F, Gilman R, Glamazdin A, Gorbenko V, Grames JM, Hansknecht J, Higinbotham DW, Holmes R, Holmstrom T, Humensky TB, Ibrahim H, de Jager CW, Jiang X, Kaufman LJ, Kelleher A, Kolarkar A, Kowalski S, Kumar KS, Lambert D, LaViolette P, LeRose J, Lhuillier D, Liyanage N, Margaziotis DJ, Mazouz M, McCormick K, Meekins DG, Meziani ZE, Michaels R, Moffit B, Monaghan P, Munoz-Camacho C, Nanda S, Nelyubin V, Neyret D, Paschke KD, Poelker M, Pomatsalyuk R, Qiang Y, Reitz B, Roche J, Saha A, Singh J, Snyder R, Souder PA, Subedi R, Suleiman R, Sulkosky V, Tobias WA, Urciuoli GM, Vacheret A, Voutier E, Wang K, Wilson R, Wojtsekhowski B, Zheng X. Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon. Phys Rev Lett 2006; 96:022003. [PMID: 16486563 DOI: 10.1103/physrevlett.96.022003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2005] [Indexed: 05/06/2023]
Abstract
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from 4He at an average scattering angle <theta(lab)> = 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.
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Affiliation(s)
- K A Aniol
- California State University, Los Angeles, Los Angeles, California 90032, USA
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