Top-quark production cross sections at higher perturbative orders
Abstract
I present calculations of higher-order corrections to top-quark production via three different processes: the production of a top-antitop pair and a Z boson; single-top quark production in the s-channel; and top-antitop production with a Higgs boson. It is shown that the contributions from soft-gluon corrections are numerically dominant and large in all these processes. I present approximate NNLO (aNNLO) and approximate N3LO (aN3LO) cross sections that include soft-gluon corrections added to the exact NLO QCD results. Electroweak corrections through NLO are also included for t tZ and t tH production. The theoretical predictions are compared to LHC measurements of total cross sections for these processes.
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