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arxiv 1910.14591 v2 pith:4JZUN55H submitted 2019-10-31 nucl-ex hep-ph

Parity-Violating Inelastic Electron-Proton Scattering at Low Q² Above the Resonance Region

classification nucl-ex hep-ph
keywords asymmetrygammaparity-violatingscatteringabovebeam-normalcalculationselectrons
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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