Precision Measurements of the Nucleon Strange Form Factors at Q 2 ∼ 0.1     GeV 2

Precision Measurements of the Nucleon Strange Form Factors at Q 2 ∼ 0.1     GeV 2

We report new measurements of the parity-violating asymmetry A_PV in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with ~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)) x1...

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Veröffentlicht in:Physical review letters 2007-01, Vol.98 (3), Article 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
Schlagworte:
Nuclear Experiment
Physics
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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 ~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 GeV^2, and G_E^s + 0.09 G_M^s = 0.007 +/- 0.011 +/- 0.006 at = 0.109 GeV^2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.98.032301