Effects of QCD resummation on W+h and tb̄ production at the Tevatron

The resummation of multiple soft gluon emission affects the kinematic distributions of W+h (where h is a Higgs boson) and tb̄ pairs at hadron colliders. Using the Collins–Soper–Sterman resummation formalism, various kinematic distributions of the individual final state particles and the pair are calculated for the W+h process, with a Higgs boson mass between 80–120 GeV, and the tb̄ process, with mt between 170–180 GeV. We also estimate part of the higher order (beyond next-to-leading order) effect to their production rates.