A Determination of Electroweak Parameters at HERA

TL;DR

This paper presents a comprehensive analysis of electroweak parameters using HERA deep inelastic scattering data, including measurements of the W boson mass, weak mixing angle, and quark couplings to the Z boson, accounting for their correlation with parton distributions.

Contribution

It provides the first HERA measurement of light quark weak couplings to the Z boson and explores right-handed isospin contributions, advancing electroweak parameter determination.

Findings

Measured W propagator mass in charged current scattering.

Determined the weak mixing angle sin^2 theta_W.

First measurement of light quark weak couplings at HERA.

Abstract

Using the deep inelastic e^+p and e^-p charged and neutral current scattering cross sections previously published, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The data used have been collected by the H1 experiment in 1994-2000 and correspond to an integrated luminosity of 117.2 pb^{-1}. A measurement is obtained of the W propagator mass in charged current ep scattering. The weak mixing angle sin^2 theta_W is determined in the on-mass-shell renormalisation scheme. A first measurement at HERA is made of the light quark weak couplings to the Z^0 boson and a possible contribution of right-handed isospin components to the weak couplings is investigated.