Search for W pair production with dilepton decay modes at D0

We present the results of a search of 13.5 pb-1 of p bar p collisions at √s = 1.8 TeV for WW → dileptons + X using the DO detector. One WW → eμv bar v + X candidate was found with an expected background of about 0.96 ± 0.44 events. One WW → eμv bar v + candidate was found with an expected background of about 1.23 ± 0.87 events. The 95% C.L. upper limit for the W pair production cross section is 133 pb without background subtraction. Making the constraint κ = 1 (Δκ = 0) implies -2.6 ≤ γ ≤ 2.7 (95% C.L.) and making the constraint γ = 0 implies - 3.3 ≤ Δκ ≤ 3.5 (95% C.L.) assuming κγ = κΖ and λγ = λΖ. We also present the contour of excluded couplings when κ and λ are allowed to simultaneously vary from their standard model values