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Paper detail

Masses, fermions and generalized D-dimensional unitarity

We extend the generalized D-dimensional unitarity method for numerical evaluation of one-loop amplitudes by incorporating massive particles. The issues related to extending the spinor algebra to higher dimensions, treatment of external self-energy diagrams and mass renormalization are discussed within the context of the D-dimensional unitarity method. To validate our approach, we calculate in QCD the one-loop scattering amplitudes of a massive quark pair with up to three additional gluons for arbitrary spin states of the external quarks and gluons.

preprint2008arXivOpen access
R. K. EllisW. T. GieleZ. KunsztK. Melnikov
hep-ph
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R. K. EllisW. T. GieleZ. KunsztK. Melnikov

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