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. 2007 Jan 19;98(3):032301.
doi: 10.1103/PhysRevLett.98.032301. Epub 2007 Jan 18.

Precision measurements of the nucleon strange form factors at Q2 approximately 0.1 GeV2

A Acha  1 , K A Aniol, D S Armstrong, J Arrington, T Averett, S L Bailey, J Barber, A Beck, H Benaoum, J Benesch, P Y Bertin, P Bosted, F Butaru, E Burtin, G D Cates, Y-C Chao, J-P Chen, E Chudakov, E Cisbani, B Craver, F Cusanno, R De Leo, P Decowski, A Deur, R J Feuerbach, J M Finn, S Frullani, S A Fuchs, K Fuoti, R Gilman, L E Glesener, K Grimm, J M Grames, J O Hansen, J Hansknecht, D W Higinbotham, R Holmes, T Holmstrom, H Ibrahim, C W de Jager, X Jiang, J Katich, L J Kaufman, A Kelleher, P M King, A Kolarkar, S Kowalski, E Kuchina, K S Kumar, L Lagamba, P LaViolette, J LeRose, R A Lindgren, D Lhuillier, N Liyanage, D J Margaziotis, P Markowitz, D G Meekins, Z-E Meziani, R Michaels, B Moffit, S Nanda, V Nelyubin, K Otis, K D Paschke, S K Phillips, M Poelker, R Pomatsalyuk, M Potokar, Y Prok, A Puckett, X Qian, Y Qiang, B Reitz, J Roche, A Saha, B Sawatzky, J Singh, K Slifer, S Sirca, R Snyder, P Solvignon, P A Souder, M L Stutzman, R Subedi, R Suleiman, V Sulkosky, W A Tobias, P E Ulmer, G M Urciuoli, K Wang, A Whitbeck, R Wilson, B Wojtsekhowski, H Yao, Y Ye, X Zhan, X Zheng, S Zhou, V Ziskin; HAPPEX Collaboration
Affiliations

Precision measurements of the nucleon strange form factors at Q2 approximately 0.1 GeV2

A Acha et al. Phys Rev Lett. .

Abstract

We report new measurements of the parity-violating asymmetry A(PV) in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with <theta(lab)> approximately 6.0 degrees . The 4He result is A(PV)=(+6.40+/-0.23(stat)+/-0.12(syst))x10(-6). The hydrogen result is A(PV)=(-1.58+/-0.12(stat)+/-0.04(syst))x10(-6). These results significantly improve constraints on the electric and magnetic strange form factors G(E)(s) and G(M)(s). We extract G(E)(s)=0.002+/-0.014+/-0.007 at <Q(2)>=0.077 GeV2, and G(E)(s)+0.09G(M)(s)=0.007+/-0.011+/-0.006 at <Q(2)>=0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.

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