Aspects of High Energy Scattering

Abstract

Scattering amplitudes in quantum field theories are of widespread interest, due to a large number of theoretical and phenomenological applications. Much is known about the possible behaviour of amplitudes, that is independent of the details of the underlying theory. This knowledge is often neglected in modern QFT courses, and the aim of these notes - aimed at graduate students - is to redress this. We review the possible singularities that amplitudes can have, before examining the generic behaviour that can arise in the high-energy limit. Finally, we illustrate the results using examples from QCD and gravity.

arXiv commentResearch training lectures first given at Queen Mary University of London in June 2019. Submission to SciPost Lecture Notes, where version 2 contains minor revisions

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• High Energy Scattering in Perturbative Quantum Gravity at Next to Leading Power
• Eikonal amplitudes from curved backgrounds
• Graviton scattering in self-dual radiative space-times
• Natural Boundaries for Scattering Amplitudes
• The SAGEX Review on Scattering Amplitudes, Chapter 12: Amplitudes and collider physics
• Regge poles and cuts and the Lipatov vertex