Combined Electroweak and QCD Fit to HERA Data
I. Abt, A.M. Cooper-Sarkar, B. Foster, C. Gwenlan, V. Myronenko, O., Turkot, K. Wichmann
TL;DR
This paper presents a combined electroweak and QCD analysis of HERA deep inelastic scattering data, providing precise measurements of Z boson couplings to quarks that align with Standard Model predictions.
Contribution
It introduces a simultaneous fit of electroweak parameters and parton distribution functions using HERA data, improving the precision of Z boson coupling measurements.
Findings
Results agree with Standard Model predictions.
Most precise measurements of a_u and v_u from a single process.
Accurate determination of electroweak parameters from HERA data.
Abstract
A simultaneous Electroweak and QCD fit of electroweak parameters and parton distribution functions to HERA data on deep inelastic scattering is presented. The input data are neutral current and charged current inclusive cross sections measured by the H1 and ZEUS collaborations at the ep collider HERA. The polarisation of the electron beam was taken into account for the ZEUS and H1 data recorded between 2004 and 2007. Results are presented on the vector and axial-vector couplings of the Z boson to u- and d-type quarks. The values are in agreement with Standard Model predictions. The results on a_u and v_u represent the most precise measurements from a single process.
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