Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon

Authors:	Aniol K A Armstrong D S Averett T Benaoum H Bertin P Y Burtin E Cahoon J Cates G D Chang C C Chao Y-C Chen J-P Choi Seonho Chudakov E Craver B Cusanno F Decowski P Deepa D Ferdi C Feuerbach R J Finn J M Frullani S Fuoti K Garibaldi F Gilman R Glamazdin A Gorbenko V Grames J M Hansknecht J Higinbotham D W Holmes R Holmstrom T Humensky T B Ibrahim H de Jager C W Jiang X Kaufman L J Kelleher A Kolarkar A Kowalski S Kumar K S Lambert D LaViolette P LeRose J Lhuillier D Liyanage N Margaziotis D J Mazouz M McCormick K Meekins D G Meziani Z-E Michaels R Moffit B Monaghan P Munoz-Camacho C Nanda S

Institution:	California State University, Los Angeles, Los Angeles, California 90032, USA.

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.

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