Higher-order corrections for t tZ production
Abstract
We present calculations of higher-order QCD and electroweak (EW) corrections to the associated production of a top-antitop quark pair and a Z boson, i.e. t tZ production, in proton collisions. We find that the contributions from soft-gluon corrections are numerically dominant and large. We present approximate NNLO (aNNLO) and approximate N3LO (aN3LO) cross sections that include soft corrections on top of the exact NLO QCD result. We also add electroweak corrections through NLO. We compare our aN3LO QCD + NLO EW theoretical results to measurements of total cross sections from the LHC, and we also calculate top-quark differential distributions in transverse momentum and rapidity.
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