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

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

We report new measurements of the parity-violating asymmetry A(PV) in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with 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))x...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Physical review letters 2007-01, Vol.98 (3), p.032301-032301
Hauptverfasser: Acha, A, Aniol, K A, Armstrong, D S, Arrington, J, Averett, T, Bailey, S L, Barber, J, Beck, A, Benaoum, H, Benesch, J, Bertin, P Y, Bosted, P, Butaru, F, Burtin, E, Cates, G D, Chao, Y-C, Chen, J-P, Chudakov, E, Cisbani, E, Craver, B, Cusanno, F, De Leo, R, Decowski, P, Deur, A, Feuerbach, R J, Finn, J M, Frullani, S, Fuchs, S A, Fuoti, K, Gilman, R, Glesener, L E, Grimm, K, Grames, J M, Hansen, J O, Hansknecht, J, Higinbotham, D W, Holmes, R, Holmstrom, T, Ibrahim, H, de Jager, C W, Jiang, X, Katich, J, Kaufman, L J, Kelleher, A, King, P M, Kolarkar, A, Kowalski, S, Kuchina, E, Kumar, K S, Lagamba, L, LaViolette, P, LeRose, J, Lindgren, R A, Lhuillier, D, Liyanage, N, Margaziotis, D J, Markowitz, P, Meekins, D G, Meziani, Z-E, Michaels, R, Moffit, B, Nanda, S, Nelyubin, V, Otis, K, Paschke, K D, Phillips, S K, Poelker, M, Pomatsalyuk, R, Potokar, M, Prok, Y, Puckett, A, Qian, X, Qiang, Y, Reitz, B, Roche, J, Saha, A, Sawatzky, B, Singh, J, Slifer, K, Sirca, S, Snyder, R, Solvignon, P, Souder, P A, Stutzman, M L, Subedi, R, Suleiman, R, Sulkosky, V, Tobias, W A, Ulmer, P E, Urciuoli, G M, Wang, K, Whitbeck, A, Wilson, R, Wojtsekhowski, B, Yao, H, Ye, Y, Zhan, X, Zheng, X, Zhou, S, Ziskin, V
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:We report new measurements of the parity-violating asymmetry A(PV) in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with 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 =0.077 GeV2, and G(E)(s)+0.09G(M)(s)=0.007+/-0.011+/-0.006 at =0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
ISSN:0031-9007