Production of WZ Events in p-barp Collisions at sqrt(s)=1.96 TeV and Limits on Anomalous WWZ Couplings

TL;DR

This paper reports on a search for WZ production in proton-antiproton collisions at 1.96 TeV, setting limits on anomalous WWZ couplings based on data collected by the DØ experiment at the Tevatron.

Contribution

First measurement of WZ production cross section and limits on anomalous WWZ couplings at Tevatron energies using 0.30 fb^(-1) of data.

Findings

Observed 3 WZ candidate events.

Measured cross section: 4.5 (+3.8 -2.6) pb.

Set limits on anomalous WWZ couplings.

Abstract

We present results from a search for WZ production with subsequent decay to l nu l'-bar l' (l and l'=electron or muon) using 0.30 fb^(-1) of data collected by the DO experiment between 2002 and 2004 at the Tevatron. Three events with WZ decay characteristics are observed. With an estimated background of 0.71+-0.08 events, we measure the WZ production cross section to be 4.5 (+3.8 -2.6) pb, with a 95% C.L. upper limit of 13.3 pb. The 95% C.L. limits for anomalous WWZ couplings are found to be -2.0 < Delta kappa_Z < 2.4 for form factor scale Lambda = 1 TeV, and -0.48 < lambda_Z < 0.48 and -0.49 < Delta g_1^Z < 0.66 for Lambda = 1.5 TeV.