Hadronic top-quark pair production with NNLL threshold resummation
Abstract
We compute the total top-quark pair production cross section at the Tevatron and LHC based on approximate NNLO results, and on the summation of threshold logarithms and Coulomb enhancements to all orders with next-to-next-to-leading logarithmic (NNLL) accuracy, including bound-state effects. We find σt t = 7.22+0.31+0.71-0.47-0.55 pb at Tevatron and σt t = 162.6+7.4+15.4-7.6-14.7 pb at LHC with 7 TeV c.o.m. energy, for mt=173.3 GeV. The implementation of joint soft and Coulomb resummation, its ambiguities, and the present theoretical uncertainty are discussed in detail. We further obtain new approximate results at N3LO.
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