High Energy Physics Seminar:"Recent Developments in Infrared Divergences"

Thu, 19/12/201914:00-15:30
Danciger B building, Seminar room
Lecturer: Eric David Kramer

Scattering with massless particles in the initial or intermediate states is known to be difficult because of infrared and collinear divergences in the amplitude. In this journal-club-style talk, I will give a brief review of the history of the subject, discussing the dressed state approach as well as the inclusive cross-section approach to dealing with this problem, the KLN theorem, and the connection between them. I will then highlight some recent developments and present 1906.03271 and 1911.06821, which, for the first time, give a systematic approach to calculating finite S-matrix elements for massless particles.