Measurement of the p-pbar -> Wgamma + X cross section at sqrt(s) = 1.96 TeV and WWgamma anomalous coupling limits

TL;DR

This paper measures the Wgamma production cross section in proton-antiproton collisions at 1.96 TeV and sets limits on anomalous WWgamma couplings, providing insights into gauge boson interactions beyond the Standard Model.

Contribution

It reports the first measurement of the p-pbar -> Wgamma cross section at Tevatron energies and constrains anomalous WWgamma couplings using collider data.

Findings

Measured cross section: 14.8 +/- 1.6 (stat) +/- 1.0 (syst) +/- 1.0 (lum) pb.

Set 95% CL limits on anomalous couplings: -0.88 < Δκγ < 0.96, -0.20 < λγ < 0.20.

Used data from 162 pb^{-1} collected by the DØ detector.

Abstract

The WWgamma triple gauge boson coupling parameters are studied using p-pbar -> l nu gamma + X (l = e,mu) events at sqrt(s) = 1.96 TeV. The data were collected with the DO detector from an integrated luminosity of 162 pb^{-1} delivered by the Fermilab Tevatron Collider. The cross section times branching fraction for p-pbar -> W(gamma) + X -> l nu gamma + X with E_T^{gamma} > 8 GeV and Delta R_{l gamma} > 0.7 is 14.8 +/- 1.6 (stat) +/- 1.0 (syst) +/- 1.0 (lum) pb. The one-dimensional 95% confidence level limits on anomalous couplings are -0.88 < Delta kappa_{gamma} < 0.96 and -0.20 < lambda_{gamma} < 0.20.