First Study of the Radiation-Amplitude Zero in W γ Production and Limits on Anomalous WW γ Couplings at √s = 1.96 TeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory Snow, University of Nebraska-LincolnFollow
DØ Collaboration

Date of this Version

June 2008

Comments

Published in Physical Review Letters 100, 241805 (2008).

Abstract

We present results from a study of pp → W γ + X events utilizing data corresponding to 0.7 fb^-1 of integrated luminosity at √s = 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We set limits on anomalous WWγ couplings at the 95% C.L. The one-dimensional 95% C.L. limits are 0.49< κ _γ < 1.51 and -0.12< λ _γ < 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 Wγ system.