I present results for the resummation of soft and collinear gluon contributions to QCD hardscattering cross sections at two loops. This requires the calculation of UV and IR divergences through two loops and the construction of soft anomalous dimensions that control resummation at NNLL. Explicit results are provided for processes that involve massless and/or massive quarks, including single top and top pair production.
Kidonakis, Nikolaos, "Two-loop Resummations for QCD Hard Scattering" (2010). Faculty Publications. 3873.