Top quark and charged Higgs production at hadron colliders

I present a brief theoretical update on top quark pair production at the Tevatron and give values of the NNLO-NNNLL cross section for both mt = 175 and 178 GeV. I then present a calculation of the cross section for charged Higgs production in association with a top quark at the LHC, including NNLO soft-gluon corrections. 1 Top quark production at the Tevatron The properties of the top quark, in particular its mass and production cross section, are subjects of intense study at the Tevatron [1, 2]. The most accurate theoretical prediction [3] for top quark pair production at the Tevatron includes soft-gluon corrections [4, 5, 6] through next-to-next-to-nextto-leading logarithmic (NNNLL) accuracy at next-to-next-to-leading order (NNLO), denoted as NNLO-NNNLL [3]. These corrections are sizable and provide a dramatic decrease in the scale dependence of the cross section. Results have been derived in both single-particle-inclusive (1PI) kinematics and pair-invariant-mass (PIM) kinematics. There are differences in the results in the two kinematics due to subleading terms, and the best estimate is given by the average of the two kinematics. For a top quark mass mt = 175 GeV the theoretical value of the cross section is [3] σ tt̄ ( √ S = 1.8 TeV, mt=175 GeV) = 5.24± 0.31 pb and σ tt̄ ( √ S = 1.96 TeV, mt=175 GeV) = 6.77± 0.42 pb at Run I and Run II, respectively. The uncertainty indicated is due to the kinematics ambiguity; the scale uncertainty is much smaller.