Measurement of Parity-Violating Asymmetry in Electron-Deuteron Inelastic Scattering

TL;DR

This paper reports detailed measurements of parity-violating asymmetries in electron-deuteron scattering across different kinematic regions, providing insights into electroweak interactions and quark-hadron duality.

Contribution

It offers comprehensive experimental data and analysis on parity-violating asymmetries, including the first evidence of quark-hadron duality in electroweak observables.

Findings

Measured parity-violating asymmetries in deep inelastic and resonance regions

Extracted electron-quark weak effective couplings

Provided first evidence for quark-hadron duality in electroweak observables

Abstract

The parity-violating asymmetries between a longitudinally-polarized electron beam and an unpolarized deuterium target have been measured recently. The measurement covered two kinematic points in the deep inelastic scattering region and five in the nucleon resonance region. We provide here details of the experimental setup, data analysis, and results on all asymmetry measurements including parity-violating electron asymmetries and those of inclusive pion production and beam-normal asymmetries. The parity-violating deep-inelastic asymmetries were used to extract the electron-quark weak effective couplings, and the resonance asymmetries provided the first evidence for quark-hadron duality in electroweak observables. These electron asymmetries and their interpretation were published earlier, but are presented here in more detail.