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arXiv · 1910.14591

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

QWeak Collaboration·D. Androic·D. S. Armstrong·A. Asaturyan·K. Bartlett·R. S. Beminiwattha·J. Benesch·F. Benmokhtar·J. Birchall·R. D. Carlini·J. C. Cornejo·M. M. Dalton·C. A. Davis·W. Deconinck·J. F. Dowd·J. A. Dunne·D. Dutta·W. S. Duvall·W. R. Falk·J. M. Finn·C. Gal·D. Gaskell·M. T. W. Gericke·J. Grames·F. Guo·J. R. Hoskins·D. Jones·M. K. Jones·R. Jones·M. Kargiantoulakis·P. M. King·E. Korkmaz·S. Kowalski·J. Leacock·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·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·V. Tadevosyan·B. Waidyawansa·P. Wang·S. P. Wells·S. A. Wood·P. Zang
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Abstract

We report the measurement of the parity-violating asymmetry for the inelastic scattering of electrons from the proton, at $Q^2 = 0.082$ GeV$^2$ and $ W = 2.23$ GeV, above the resonance region. The result $A_{\rm Inel} = - 13.5 \pm 2.0 ({\rm stat}) \pm 3.9 ({\rm syst})$~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 box diagram ($\Box_{\gamma Z}$) 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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QWeak Collaboration, D. Androic, D. S. Armstrong, A. Asaturyan, K. Bartlett, R. S. Beminiwattha, J. Benesch, F. Benmokhtar, J. Birchall, R. D. Carlini, J. C. Cornejo, M. M. Dalton, C. A. Davis, W. Deconinck, J. F. Dowd, J. A. Dunne, D. Dutta, W. S. Duvall, W. R. Falk, J. M. Finn, C. Gal, D. Gaskell, M. T. W. Gericke, J. Grames, F. Guo, J. R. Hoskins, D. Jones, M. K. Jones, R. Jones, M. Kargiantoulakis, P. M. King, E. Korkmaz, S. Kowalski, J. Leacock, 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, 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, V. Tadevosyan, B. Waidyawansa, P. Wang, S. P. Wells, S. A. Wood, P. Zang. 2019-10-31. Parity-Violating Inelastic Electron-Proton Scattering at Low $Q^2$ Above the Resonance Region. https://doi.org/10.1103/physrevc.101.055503

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