Limits on anomalous trilinear gauge boson couplings from WW, WZ and Wgamma production in pp-bar collisions at sqrt{s}=1.96 TeV

TL;DR

This paper reports the most stringent collider limits to date on anomalous gauge boson couplings, using extensive data from pp-bar collisions at 1.96 TeV, improving constraints on new physics beyond the Standard Model.

Contribution

It provides the first combined analysis of WW, WZ, and Wgamma production data to set tight limits on anomalous gauge couplings at a hadron collider.

Findings

Most stringent limits on anomalous couplings to date

Constraints on W boson magnetic dipole and electric quadrupole moments

Combined analysis improves sensitivity over previous individual studies

Abstract

We present final searches of the anomalous gammaWW and ZWW trilinear gauge boson couplings from WW and WZ production using lepton plus dijet final states and a combination with results from Wgamma, WW, and WZ production with leptonic final states. The analyzed data correspond to up to 8.6/fb of integrated luminosity collected by the D0 detector in pp-bar collisions at sqrt{s}=1.96 TeV. We set the most stringent limits at a hadron collider to date assuming two different relations between the anomalous coupling parameters Delta\kappa_\gamma, lambda, and Delta g_1^Z for a cutoff energy scale Lambda=2 TeV. The combined 68% C.L. limits are -0.057<Delta\kappa_\gamma<0.154, -0.015<lambda<0.028, and -0.008<Delta g_1^Z<0.054 for the LEP parameterization, and -0.007<Delta\kappa<0.081 and -0.017<lambda<0.028 for the equal couplings parameterization. We also present the most stringent limits of the W boson magnetic dipole and electric quadrupole moments.