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

K A Aniol; 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

doi:10.1103/PhysRevLett.96.022003

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

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

Authors

K A Aniol¹, 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

Affiliation

¹ California State University, Los Angeles, Los Angeles, California 90032, USA.

PMID: 16486563
DOI: 10.1103/PhysRevLett.96.022003

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.