München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 11: QCD (Theorie) 1

T 11.5: Talk

Monday, March 9, 2009, 18:00–18:15, M109

Nagy Soper dipole subtraction scheme — •Tania Robens, Cheng-Han Chung, and Michael Kraemer — RWTH Aachen, Inst. f. Theor. Physik E

In NLO QCD calculations, the infrared divergences are usually regulated using dipole subtraction scheme. In the standard scheme from Catani and Seymour, which is well established and has been used in numerous calculations, the local counterterms need to be recalculated for each emitter/ spectator pair; therefore, this scheme quickly comes to its limitations if the number of final state particles is increased. Following an approach suggested by Zoltan Nagy and Dave Soper, we employ a subtraction scheme with a slightly altered phase space matching such that the number of kinematic transformations is greatly reduced. In addition, the new scheme allows for easy matching with a parton shower using the same splitting functions. We discuss the general setup and the differences with respect to standard subtraction schemes.