The Top Cross Section in Hadronic Collisions
  We reexamine the top quark production cross section at the Tevatron and LHC, in the light of recent progress on the resummation of logarithmic soft gluon corrections. We find that resummation effects are much smaller than previously thought. We also compute Coulombic threshold effects, and find them negligible. We update the discussion of uncertainties due to scale dependence, the value of the strong coupling constant, and the parton density parametrization. Our current best estimate of the top production cross section at the Tevatron and its error is $\sigma(\mt=175\,{\rm GeV})=4.75{+0.73\atop-0.62}$. 
S. Catani, M.L. Mangano, P. Nason and L. Trentadue