New Precision Limit on the Strange Vector Form Factors of the Proton
Author(s)
Huang, J.; Muangma, Navaphon; Sulkosky, Vincent; Zhan, X.; Kowalski, Stanley B.; Pan, Kai, Ph. D. Massachusetts Institute of Technology; ... Show more Show less
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The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q[superscript 2]=0.624 GeV[superscript 2] and beam energy E[subscript b]=3.48 GeV to be A[subscript PV]=-23.80±0.78(stat)±0.36(syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors G[subscript E][superscript s]+0.517G[subscript M][superscript s]=0.003±0.010(stat)±0.004(syst)±0.009(ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors.
Date issued
2012-03Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Ahmed, Z. et al. “New Precision Limit on the Strange Vector Form Factors of the Proton.” Physical Review Letters 108.10 (2012). © 2012 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114