Higher order QCD corrections via local subtraction
by
G. Somogyi(CERN)
→
Europe/Rome
Aula Conversi (Dipartimento di Fisica - Ed. G. Marconi)
Aula Conversi
Dipartimento di Fisica - Ed. G. Marconi
Description
At the LHC very high energy proton-proton collisions are measured at a level of precision which demands that the computed theory predictions include higher order corrections. In recent years the precision frontier for QCD calculations has moved beyond next-to-leading order and today fully differential results at next-to-next-to-leading order accuracy are available for a handful of processes. One serious bottleneck which hampers the straightforward evaluation of cross sections at higher perturbative orders is the presence of infrared singularities in intermediate stages of the computation. One possible way of dealing consistently with infrared singularities is through a so-called subtraction algorithm. In this talk I will describe a general local subtraction scheme for calculating NNLO QCD corrections. I will give and overview of the main conceptual issues that need to be addressed as well as present some technical aspects of our subtraction algorithm.