Limits on anomalous WWγ couplings from pp̅→Wγ+X events at √s=1.8 TeV

Abstract

We have measured the WWγ gauge boson coupling parameters using pp̅→lνγ+X (l=e,μ) events at √s=1.8 TeV. The data, corresponding to an integrated luminosity of 92.8 pb^-1, were collected using the DØ detector at the Fermilab Tevatron Collider. The measured cross section times branching ratio for pp̅→Wγ+X with p_T^γ>10 GeV/c and R_lγ>0.7 is 11.3_-1.5^+1.7±1.5 pb, in agreement with the standard model prediction. The 1 degree of freedom 95% confidence level limits on individual CP-conserving parameters are -0.93<Δκ<0.94 and -0.31<λ<0.29. Similar limits are set on the CP-violating coupling parameters.