W and Anomalous Single Top Production at HERA

TL;DR

This paper reports on measurements of W boson production, polarization, and a search for anomalous single top production at HERA, setting limits on top production cross section and magnetic coupling, using the complete HERA data set.

Contribution

It provides the first comprehensive analysis of W production and sets new limits on anomalous single top production at HERA.

Findings

Measured W production cross section and polarization fractions.

Established an upper limit on single top production cross section.

Set bounds on the anomalous magnetic coupling ta;tu8c;

Abstract

The analysis of $W$ production and the search for anomalous single top production is performed with the H1 detector at HERA with an integrated luminosity of 0.5 fb$^{-1}$, consisting of the complete high energy data from the HERA programme. Production cross section measurements of single $W$ production, as well as $W$ polarisation fractions in events containing isolated leptons and missing transverse momentum are also presented. In the context of a search for single top production an upper limit on the top production cross section $\sigma_{ep\to etX} < 0.16$ pb is established at the 95% confidence level, corresponding to an upper bound on the anomalous magnetic coupling $\kappa_{tu\gamma} < 0.14$.