New Precision Limit on the Strange Vector Form Factors of the Proton
Name
Ahmed-2012-New Precision Limit on the Strange Vector Form Factors of the Proton.pdf
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Author(s)
Huang, J.
Muangma, Navaphon
Sulkosky, Vincent
Zhan, X.
Kowalski, Stanley B.
Pan, Kai, Ph. D. Massachusetts Institute of Technology
Date Issued
March 2012
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.108.102001
