Next-to-leading order QCD predictions for Z,gamma*+3-jet distributions at the Tevatron

Using BLACKHAT in conjunction with SHERPA, we have computed next-to-leading order QCD predictions for a variety of distributions in Z,gamma* + 1, 2, 3-jet production at the Tevatron, where the Z boson or off-shell photon decays into an electron-positron pair. We find good agreement between the next-to-leading order results for jet p(T) distributions and measurements by CDF and D0. We also present jet-production ratios, or probabilities of finding one additional jet. As a function of vector-boson p(T), the ratios have distinctive features which we describe in terms of a simple model capturing leading logarithms and phase-space and parton-distribution-function suppression.