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. 2006 Jan 20;96(2):022003.
doi: 10.1103/PhysRevLett.96.022003. Epub 2006 Jan 18.

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

K A Aniol  1 , D S Armstrong, T Averett, H Benaoum, P Y Bertin, E Burtin, J Cahoon, G D Cates, C C Chang, Y-C 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, P LaViolette, J LeRose, D Lhuillier, N Liyanage, D J Margaziotis, M Mazouz, K McCormick, D G Meekins, Z-E Meziani, R Michaels, B Moffit, P Monaghan, C Munoz-Camacho, S Nanda, V Nelyubin, D Neyret, K D Paschke, M Poelker, R Pomatsalyuk, Y Qiang, B Reitz, J Roche, A Saha, J 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 Wilson, B Wojtsekhowski, X Zheng; HAPPEX Collaboration
Affiliations

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

K A Aniol et al. Phys Rev Lett. .

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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