External leg corrections in the unitarity method

Details External leg corrections in the unitarity method External leg corrections in the unitarity method

2011-09-23

arxiv.org/abs/1109.5106v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 9 figures. Published version. Eq. (B.17) corrected, minor clarifications, typos fixed

Scientific paper

Unitarity cuts diverge in the channel of a single massive external fermion. We propose an off-shell continuation of the momentum that allows a finite evaluation of the unitarity cuts. If the cut is taken with complete amplitudes on each side, our continuation and expansion around the on-shell configuration produces the finite contribution to the bubble coefficient. Finite parts in the expansion of the external leg counterterms must be included explicitly as well.

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