Zgamma Production in pbarp Collisions at sqrt(s)=1.8 TeV and Limits on Anomalous ZZgamma and Zgammagamma Couplings

TL;DR

This study analyzes Z + gamma production in proton-antiproton collisions at 1.8 TeV, confirming Standard Model predictions and setting limits on anomalous couplings with data from the D0 detector.

Contribution

First measurement of Z + gamma production at Tevatron energies with limits on anomalous couplings using D0 data.

Findings

Event yields match Standard Model predictions.

Set 95% CL limits on anomalous couplings.

Combined analysis improves previous constraints.

Abstract

We present a study of Z +gamma + X production in p-bar p collisions at sqrt{S}=1.8 TeV from 97 (87) pb^{-1} of data collected in the eegamma (mumugamma) decay channel with the D0 detector at Fermilab. The event yield and kinematic characteristics are consistent with the Standard Model predictions. We obtain limits on anomalous ZZgamma and Zgammagamma couplings for form factor scales Lambda = 500 GeV and Lambda = 750 GeV. Combining this analysis with our previous results yields 95% CL limits |h{Z}_{30}| < 0.36, |h{Z}_{40}| < 0.05, |h{gamma}_{30}| < 0.37, and |h{gamma}_{40}| < 0.05 for a form factor scale Lambda=750 GeV.