First study of the radiation-amplitude zero in Wgamma production and limits on anomalous WWgamma couplings at sqrt(s)=1.96 TeV

TL;DR

This study analyzes Wgamma production at 1.96 TeV, observing the radiation-amplitude zero and setting limits on anomalous WWgamma couplings, providing new insights into electroweak interactions.

Contribution

It is the first to investigate the radiation-amplitude zero in Wgamma production and to establish limits on anomalous WWgamma couplings at Tevatron energies.

Findings

Observation of the radiation-amplitude zero consistent with the Standard Model.

Set 95% C.L. limits on anomalous WWgamma couplings: 0.49<kappa_{gamma}<1.51 and -0.12<lambda_{gamma}<0.13.

First study of charge-signed rapidity difference in Wgamma events.

Abstract

We present results from a study of p-pbar -> W(gamma) + X events utilizing data corresponding to 0.7 fb^{-1} of integrated luminosity at sqrt(s) = 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We set limits on anomalous WWgamma couplings at the 95% C.L. The one dimensional 95% C.L. limits are 0.49 < kappa_{gamma} < 1.51 and -0.12 < lambda_{gamma} < 0.13. We make the first study of the charge-signed rapidity difference between the lepton and the photon and find it to be indicative of the standard model radiation-amplitude zero in the Wgamma system.