Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 206: QCD Theorie I

T 206.4: Talk

Tuesday, March 6, 2007, 17:30–17:45, KIP SR 2.401

Multi-gluon amplitudes with heavy quarks from SUSY and BCF recursion relations — •Christian Schwinn¹ and Stefan Weinzierl² — ¹Institut für Theoretische Physik E, RWTH Aachen, 52056 Aachen — ²Institut für Physik, Universität Mainz, 55099 Mainz

Recently a number of new methods for the calculation of helicity amplitudes in QCD have been introduced, in particular the recursion relations of Britto-Cachazo-Feng (BCF) that construct scattering amplitudes from on-shell sub-amplitudes with external momenta shifted into the complex plane. We discuss the application of the BCF relations to amplitudes with massive quarks and show how to perform the shift of massive quark legs. It is also shown how to relate scattering amplitudes of massive quarks to amplitudes of massive scalars by supersymmetric Ward-Identities.