Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-22
Physics
High Energy Physics
High Energy Physics - Phenomenology
183 pages, 21 figures, 699 equations; v3 includes additional material and various improvements, version accepted for publicati
Scientific paper
The success of the experimental program at the Tevatron re-inforced the idea that precision physics at hadron colliders is desirable and, indeed, possible. The Tevatron data strongly suggests that one-loop computations in QCD describe hard scattering well. Extrapolating this observation to the LHC, we conclude that knowledge of many short-distance processes at next-to-leading order may be required to describe the physics of hard scattering. While the field of one-loop computations is quite mature, parton multiplicities in hard LHC events are so high that traditional computational techniques become inefficient. Recently new approaches based on unitarity have been developed for calculating one-loop scattering amplitudes in quantum field theory. These methods are especially suitable for the description of multi-particle processes in QCD and are amenable to numerical implementations. We present a systematic pedagogical description of both conceptual and technical aspects of the new methods.
Ellis Keith R.
Kunszt Zoltan
Melnikov Kirill
Zanderighi Giulia
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