Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-03-02
JHEP 0704:072,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
30 pages, minor changes
Scientific paper
10.1088/1126-6708/2007/04/072
We consider on-shell recursion relations for all Born QCD amplitudes. This includes amplitudes with several pairs of quarks and massive quarks. We give a detailed description on how to shift the external particles in spinor space and clarify the allowed helicities of the shifted legs. We proof that the corresponding meromorphic functions vanish at z --> infinity. As an application we obtain compact expressions for helicity amplitudes including a pair of massive quarks, one negative helicity gluon and an arbitrary number of positive helicity gluons.
Schwinn Christian
Weinzierl Stefan
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