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Parity-violating inelastic electron-proton scattering at low Q^2 above the resonance region
Androic, D. Armstrong, David S. Qweak Collaboration,
Androic, D.
Armstrong, David S.
Qweak Collaboration,
Abstract
We report the measurement of the parity-violating asymmetry for the inelastic scattering of electrons from the proton, at Q2=0.082GeV2 and W=2.23 GeV, above the resonance region. The result AInel=−13.5±2.0(stat)±3.9(syst) ppm agrees with theoretical calculations, and helps to validate the modeling of the γZ interference structure functions FγZ1 and FγZ2 used in those calculations, which are also used for determination of the two-boson exchange γ−Z box diagram (□γZ) contribution to parity-violating elastic scattering measurements. A positive parity-violating asymmetry for inclusive π− production was observed, as well as positive beam-normal single-spin asymmetry for scattered electrons and a negative beam-normal single-spin asymmetry for inclusive π− production.
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2020-05-01
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PhysRevC.101.055503.pdf
Adobe PDF, 828.41 KB
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Physics
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https://doi.org/10.1103/PhysRevC.101.055503