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Physics from the S-matrix: Scattering Amplitudes without Lagrangians

par Conde Pena, Eduardo
Référence Pos proceedings of science, Modave 2013, 005
Publication Publié, 2014-04

Article révisé par les pairs

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Résumé :

The aim of these lectures is to provide a rigorous background for someone interested in the so-called on-shell methods for the computation of scattering amplitudes. With the hindsight gained by the exciting recent advances in the field, we revisit the essential ideas of the "S-matrix program", putting the emphasis on their proof (and what are the assumptions needed at each step) rather than on their utilization. Although part of the discussion is valid at any order in perturbation theory, we focus mostly on the tree level, and briefly introduce the BCFW recursion relations as an example of on-shell methods.