Search for anomalous WW/WZ → eνjj production at D0

A search for anomalous WW and WZ production in p anti p collisions at √s = 1.8 TeV using the D0 detector at Fermilab is presented. With a data sample of p anti p → eνjjX events corresponding to an integrated luminosity of 76.5 ± 4.1pb-1. 399 candidate events were identified, from which 387.1 ± 39.8 events were estimated to be background. No deviations from the Standard Model were seen, which predicts 16.2 ± 2.7 events. The 95% CL limit on the cross section σ(p anti p → W+W-X) was calculated to be 93.8 pb. Limits on the CP-conserving anomalous WWγ and WWZ coupling parameters were obtained from a binned likelihood fit to the transverse momentum spectrum of the W boson. Assuming that the WWγ and WWZ coupling parameters are equal, the 95% CL limits on the CP-conserving couplings are -0.56 < Δκ < 0.75 (with λ = 0) and -0.42 < λ < 0.44 (with Δκ = 0), for a form factor scale ΛFF = 1.5 TeV. Limits on other assumptions are also reported. These results were combined with the previous D0 WW, WZ → eνjj published results (13.7 ± 0.7 pb-1), and the limits on the anomalous coupling parameters were set to -0.44 < Δκ < 0.60 (with λ = 0) and -0.34 < λ 0.37 (with Δκ = 0), for a form factor scale ΛFF = 2.0 TeV