Search for events with an isolated lepton and missing transverse momentum and a measurement of W production at HERA

TL;DR

This paper reports a search for events with isolated leptons and missing transverse momentum at HERA, measuring W boson production cross section, and finds results consistent with the Standard Model.

Contribution

First measurement of W boson production cross section in electron-proton collisions at HERA with detailed event selection.

Findings

Measured W production cross section: 0.89 pb

Results agree with Standard Model predictions

Analyzed 504 pb^{-1} of data

Abstract

A search for events with an isolated high-energy lepton and large missing transverse momentum has been performed with the ZEUS detector at HERA using a total integrated luminosity of 504 $\mathrm{pb}^{-1}$. The results agree well with Standard Model predictions. The cross section for production of single $W$ bosons in electron-proton collisions with unpolarised electrons is measured to be $0.89^{+0.25}_{-0.22}$ (stat.) $\pm{0.10}$ (syst.) pb.