Parity-Violating Inelastic Electron-Proton Scattering at Low $Q^2$ Above the Resonance Region

D. Androić,D. S. Armstrong,A. Asaturyan,K. Bartlett,R. S. Beminiwattha,J. Benesch,F. Benmokhtar,J. Birchall,R. D. Carlini,J. C. Cornejo,S. Covrig Dusa,M. M. Dalton,C. A. Davis,W. Deconinck,J. F. Dowd,J. A. Dunne,D. Dutta,W. S. Duvall,M. Elaasar,W. R. Falk,J. M. Finn,C. Gal,D. Gaskell,M. T. W. Gericke,J. Grames,V. M. Gray,K. Grimm, F. Guo, J. R. Hoskins,D. Jones,M. K. Jones, R. T. Jones,M. Kargiantoulakis,P. M. King,E. Korkmaz,S. Kowalski, J. Leacock,J. P. Leckey,A. R. Lee,J. H. Lee,L. Lee, S. MacEwan,D. Mack,J. A. Magee,J. Mammei,J. W. Martin,M. J. McHugh,D. Meekins,K. E. Mesick,R. Michaels, A. Micherdzinska,A. Mkrtchyan,H. Mkrtchyan,N. Morgan,A. Narayan,L. Z. Ndukum,V. Nelyubin,W. T. H. van Oers,V. F. Owen, S. A. Page,J. Pan,K. D. Paschke,S. K. Phillips,M. L. Pitt,R. W. Radloff,W. D. Ramsay,J. Roche,B. Sawatzky,T. Seva,M. H. Shabestari,R. Silwal, N. Simicevic,G. R. Smith, P. Solvignon,D. T. Spayde,A. Subedi,R. Suleiman, V. Tadevosyan,B. Waidyawansa,P. Wang, S. P. Wells, S. A. Wood,S. Yang,P. Zang

arxiv（2020）

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摘要

We report the measurement of the parity-violating asymmetry for the inelastic scattering of electrons from the proton, at Q(2) = 0.082 GeV2 and W = 2.23 GeV, above the resonance region. The result A(Inel) = -13.5 +/- 2.0(stat) +/- 3.9(syst) ppm agrees with theoretical calculations, and helps to validate the modeling of the gamma Z interference structure functions F-1(gamma Z) and F-2(gamma Z) used in those calculations, which are also used for determination of the two-boson exchange gamma-Z box diagram (square(gamma Z)) contribution to parity-violating elastic scattering measurements. A positive parity-violating asymmetry for inclusive pi(-) 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 pi(-) production.

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