Ww and Wz Production at the Tevatron

Boson pair production is one of the few processes that have significant effects from triple boson vertices at tree level. These couplings are predicted in the standard model and are directly related to its gauge group structure. One of the goals of diboson measurements is to limit deviations from the standard model values of these triple gauge couplings (TGCs). Such deviations could be observed in either the cross-sections or in the kinematic distributions of the observed events. Possible causes of anomalous TGCs include new particles in loop diagrams. It is also possible for diboson final states to receive contributions from the s-channel production of an as yet unobserved particle, most notably the standard model Higgs decaying to a pair of W bosons. This report summarizes recent measurements by the CDF and DØ collaborations of WW and WZ production at the Tevatron. The Tevatron produces pp collision at 1.96 TeV center of mass energy. The dominant contributions to the cross-sections for WW and WZ production are the t-channel (and similar u-channel) process involving two instances of the well measured boson-quark couplings and the s-channel process involving triple gauge couplings, shown in Figure 1. The TGCs can in general be functions of the invariant mass of the final state bosons √ ŝ, so measurements at the Tevatron compliment previous measurements at LEP because they probe larger values of √ ŝ. Furthermore, the WZ final state, which is not accessible in ee collisions, isolates the WWZ coupling from WWγ.