NNNLO results on top-quark pair production near threshold
  We present new results on the NNNLO top-antitop production cross section near threshold from potential and ultrasoft gluon corrections. The new non-logarithmic third-order terms are in the 10% range and lead to a significant reduction in the theoretical error. 
M. Beneke (RWTH Aachen), Y. Kiyo (Karlsruhe U.), K. Schuller (RWTH   Aachen)