From scattering amplitudes to cross sections in QCD

Details From scattering amplitudes to cross sections in QCD From scattering amplitudes to cross sections in QCD

1996-03-06

arxiv.org/abs/hep-ph/9603235v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 23 pages, with sprocl.sty file. Presented at the Theoretical Advanced Study Institute (TASI 95), Boulder, CO, June 4-30,

Scientific paper

I describe how to calculate cross sections for hard-scattering processes in high energy collisions at next to leading order in QCD. I consider infrared-safe quantities and I assume that the scattering amplitudes are known in analytic form up to next-to-leading order. The main topic is the description of the algorithm for the analytic cancellation of the soft and collinear singularities in the loop and bremsstrahlung contributions. The method is systematic and general. It allows the construction of an analytic expression for finite next-to-leading order hard scattering cross sections suitable for numerical evaluation.

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