NNLL momentum-space threshold resummation in direct top quark production   at the LHC
  We update the theoretical precision of the total cross section for direct top quark production at the LHC by extending the threshold resummation to the next-to-next-to-leading logarithmic accuracy. 
Li Lin Yang, Chong Sheng Li, Jun Gao and Jian Wang
hep-ph hep-ex