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T: Fachverband Teilchenphysik

T 10: QCD (Theorie) I

T 10.3: Vortrag

Montag, 15. März 2010, 17:15–17:30, HG XVI

Hexagon Evaluation — •Francisco Campanario and Dieter Zeppenfeld — Institut für Theoretische Physik, Karlsruhe Institute of Technology - Campus South, Wolfgang-Gaede-Str. 1, 30.23 76131 Karlsruhe

Some of the virtual contributions necessary for the calculation of the NLO QCD corrections for pp -> VVjj + X are presented. A second example concerns the hexagon heavy quark loops for the full quark mass dependence of H-> jjj in gluon fusion at LO QCD. The calculation is performed using Feynman diagrams collected in topologically different subsets. Stability issues associated with the evaluation of the hexagons up to rank 5 are studied. The CPU time of the fortran subroutines for the hexagons is of order two milliseconds.