The top-quark pair production cross section at next-to-next-to-leading logarithmic order
Abstract
We present predictions for the total ttbar production cross section sigmattbar at the Tevatron and LHC, which include the resummation of soft logarithms and Coulomb singularities through next-to-next-to-leading logarithmic order, and ttbar bound-state contributions. Resummation effects amount to about 8 % of the next-to-leading order result at Tevatron and about 3 % at LHC with 7 TeV centre-of-mass energy. They lead to a significant reduction of the theoretical uncertainty. With mt=173.3 GeV, we find sigmattbar=7.22+0.31+0.71-0.47-0.55 pb at Tevatron and sigmattbar=162.6+7.4+15.4-7.5-14.7 at the LHC, in good agreement with the latest experimental measurements.
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