Constraints on the Nucleon Strange Form Factors at Q2 ∼ 0.1 GeV2

Authors

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
D. Deepa, Old Dominion University
H. Ibrahim, Old Dominion University

Document Type

Article

Publication Date

2006

DOI

10.1016/j.physletb.2006.03.011

Publication Title

Physics Letters B

Volume

635

Issue

5-6

Pages

275-279

Abstract

We report the most precise measurement to date of a parity-violating asymmetry in elastic electron–proton scattering. The measurement was carried out with a beam energy of 3.03 GeV and a scattering angle (θ_lab) = 6.0○ , with the result A PV = ( − 1.14 ± 0.24 ( stat ) ± 0.06 ( syst ) ) × 10⁻⁶ . From this we extract, at Q² = 0.099 GeV² , the strange form factor combination G^s_E + 0.080 G^s_M = 0.030 ± 0.025 ( stat ) ± 0.006 ( syst ) ± 0.012 ( FF ) where the first two errors are experimental and the last error is due to the uncertainty in the neutron electromagnetic form factor. This result significantly improves current knowledge of G^s_E and G^s_M at Q² ∼ 0.1 GeV² . A consistent picture emerges when several measurements at about the same Q² value are combined: G^s_E is consistent with zero while positive values are favored for G^s_M, though G^s_E = G^s_M = 0 is compatible with the data at 95% C.L.

Original Publication Citation

Aniol, K. A., Armstrong, D. S., Averett, T., Benaoum, H., Bertin, P. Y., Burtin, E., . . . Zheng, X. (2006). Constraints on the nucleon strange form factors at Q² ∼ 0.1 GeV². Physics Letters B, 635(5–6), 275-279. doi:http://dx.doi.org/10.1016/j.physletb.2006.03.011

Repository Citation

Aniol, K. A.; Armstrong, D. S.; Averett, T.; Benaoum, H.; Bertin, P. Y.; Burtin, E.; Cahoon, J.; Cates, G. D.; Chang, C. C.; Chao, Y.-C.; Deepa, D.; and Ibrahim, H., "Constraints on the Nucleon Strange Form Factors at Q2 ∼ 0.1 GeV2" (2006). Mechanical & Aerospace Engineering Faculty Publications. 44.
https://digitalcommons.odu.edu/mae_fac_pubs/44