Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q[superscript 2]=0.22  (GeV/c)[superscript 2]

Author(s)
Baunack, S.; Aulenbacher, K.; Balaguer Rios, D.; Capozza, L.; Diefenbach, J.; ... Show more
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Abstract
A new measurement of the parity violating asymmetry in elastic electron scattering on hydrogen at backward angles and at a four momentum transfer of Q[superscript 2]=0.22   (GeV/c)[superscript 2] is reported here. The measured asymmetry is A[subscript LR]=(-17.23±0.82stat±0.89syst)×10-6. The standard model prediction assuming no strangeness is A[subscript 0]=(-15.87±1.22)×10[superscript -6]. In combination with previous results from measurements at forward angles, it is possible to disentangle for the first time the strange form factors at this momentum transfer, GE[superscript s]=0.050±0.038±0.019 and GM[superscript s]=-0.14±0.11±0.11.
Date issued
2009-04
URI
http://hdl.handle.net/1721.1/52673
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Baunack, S. et al "Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q2=0.22   (GeV/c)2." Physical Review Letters 102.15 (2009): 151803. © 2009 The American Physical Society
Version: Final published version
ISSN
0031-9007
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