Measurement of high-Q2 charged current cross sections in e-p deep inelastic scattering at HERA

TL;DR

This paper reports precise measurements of charged current deep inelastic scattering cross sections at HERA, confirming Standard Model predictions and estimating the W boson mass with associated uncertainties.

Contribution

First detailed measurement of differential cross sections at high Q2 in e-p scattering, providing data consistent with the Standard Model and estimating the W boson mass.

Findings

Measured differential cross sections dσ/dQ2, dσ/dx, dσ/dy

Measured d2σ/dxdQ2 in a broad kinematic range

Estimated W boson mass as 80.3 GeV with uncertainties

Abstract

Cross sections for e-p charged current deep inelastic scattering have been measured at a centre-of-mass energy of 318 GeV with an integrated luminosity of 16.4 pb-1 using the ZEUS detector at HERA. Differential cross-sections d\sigma/dQ2, d\sigma/dx and d\sigma/dy are presented for Q2>200 GeV2. In addition, d2\sigma/dxdQ2 was measured in the kinematic range 280 GeV2 < Q2 < 30000 GeV2 and 0.015 < x < 0.42. The predictions of the Standard Model agree well with the measured cross sections. The mass of the W boson, determined from a fit to d\sigma/dQ2, is MW=80.3 \pm 2.1 (stat.) \pm 1.2 (syst.) \pm 1.0 (PDF) GeV.