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

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 $A_{\mathrm{Inel}}=-13.5\pm 2.0(\mathrm{stat})\pm 3.9(\mathrm{syst})$~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 (${\square }_{\gamma Z}$) 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.

arXiv comment18 pages, 9 figures, version accepted in Physical Review C

References in corpus (43)

• Two-photon exchange and elastic electron-proton scattering
• How to reconcile the Rosenbluth and the polarization transfer method in the measurement of the proton form factors
• Precision Measurement of the Weak Mixing Angle in Moller Scattering
• Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment
• Reduced hadronic uncertainty in the determination of $V_{ud}$
• Precision Measurement of the Weak Charge of the Proton
• Dispersive Evaluation of the Inner Radiative Correction in Neutron and Nuclear $\beta$-decay
• Empirical Fit to Precision Inclusive Electron-Proton Cross Sections in the Resonance Region
• Two-Photon Physics in Hadronic Processes
• The Weak Charge of the Proton and New Physics
• Measurement of the two-photon exchange contribution to the elastic $e^{\pm }p$ scattering cross sections at the VEPP-3 storage ring
• Two-photon exchange in elastic electron-proton scattering
• Empirical Fit to Inelastic Electron-Deuteron and Electron-Neutron Resonance Region Transverse Cross Sections
• Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of double photon exchange amplitudes
• Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering: Determined by the OLYMPUS Experiment
• Measurement of the Transverse Beam Spin Asymmetry in Elastic Electron Proton Scattering and the Inelastic Contribution to the Imaginary Part of the Two-Photon Exchange Amplitude
• $\gamma W$-box Inside-Out: Nuclear Polarizabilities Distort the Beta Decay Spectrum
• Polarization Transfer Observables in Elastic Electron Proton Scattering at $Q^2=$2.5, 5.2, 6.8, and 8.5 GeV${}^2$
• Model-dependence of the $\gamma Z$ dispersion correction to the parity-violating asymmetry in elastic $ep$ scattering
• Dispersion $\gamma Z$-box correction to the weak charge of the proton
• gamma-Z corrections to forward-angle parity-violating e-p scattering
• Measurement of two-photon exchange effect by comparing elastic $e^{\pm }p$ cross sections
• New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei
• New formulation of gamma-Z box corrections to the weak charge of the proton
• Gamma-Z box contributions to parity violating elastic e-p scattering
• The P2 Experiment - A future high-precision measurement of the electroweak mixing angle at low momentum transfer
• Beam-Recoil Polarization Transfer in the Nucleon Resonance Region in the Exclusive $\vec{e}p\to e^{\prime }{K}^{+}\vec{\Lambda }$ and $\vec{e}p\to e^{\prime }{K}^{+}{\vec{\Sigma }}^0$ Reactions at CLAS
• Constrained gamma-Z interference corrections to parity-violating electron scattering
• First Observation of $P$-odd $\gamma$ Asymmetry in Polarized Neutron Capture on Hydrogen
• Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering
• Coulomb distortion of relativistic electrons in the nuclear electrostatic field
• Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering
• Measurement of the Target-Normal Single-Spin Asymmetry in Quasi-Elastic Scattering from the Reaction ${}^3$He${}^{\uparrow }(e,e^{\prime })$
• Measurement of the Parity-Violating Asymmetry in Electron-Deuteron Scattering in the Nucleon Resonance Region
• Precision Electron-Beam Polarimetry using Compton Scattering at 1 GeV
• Toward a First-Principles Calculation of Electroweak Box Diagrams
• Beam normal spin asymmetry for the $ep\to e\Delta (1232)$ process
• Quark-hadron duality constraints on γZ box corrections to parity-violating elastic scattering
• Modification of electromagnetic structure functions for the $\gamma Z$-box diagram
• Target-normal single-spin asymmetry in elastic electron-nucleon scattering
• A novel comparison of Møller and Compton electron-beam polarimeters
• Reduced uncertainty of the axial $\gamma Z$-box correction to the proton's weak charge
• Electron Beam Single-Spin Asymmetries in the Resonance Region with Final Hadrons Observed

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