Events with Isolated Leptons and Missing Transverse Momentum and Measurement of W Production at HERA

TL;DR

This paper reports on the measurement of W boson production and properties using high-energy isolated leptons and missing transverse momentum data from the H1 experiment at HERA, confirming Standard Model predictions.

Contribution

It provides a precise measurement of the W production cross section and sets limits on gauge couplings and W polarization, using the full HERA dataset.

Findings

W production cross section measured as 1.14 pb

Results agree with Standard Model expectations

Limits set on WWγ gauge couplings and W polarization

Abstract

Events with high energy isolated electrons, muons or tau leptons and missing transverse momentum are studied using the full e^\pm p data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb^{-1}. Within the Standard Model, events with isolated leptons and missing transverse momentum mainly originate from the production of single W bosons. The total single W boson production cross section is measured as 1.14 \pm 0.25 (stat.) \pm 0.14 (sys.) pb, in agreement with the Standard Model expectation. The data are also used to establish limits on the WW\gamma gauge couplings and for a measurement of the W boson polarisation.