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SUMMARY:Infrared Finite Cross Sections and S-matrix elements - Holmfridur 
 Hannesdottir (Harvard)
DTSTART:20200507T150000Z
DTEND:20200507T160000Z
UID:TALK141496@talks.cam.ac.uk
CONTACT:Mathieu Pellen
DESCRIPTION:*The seminar will take place via vidyo "here":https://indico.c
 ern.ch/event/908222/ .\nThe explicit url is: https://indico.cern.ch/event/
 908222/ .*\n\nQuantum field theory (QFT) works remarkably well for making 
 theoretical predictions in collider scattering experiments. One of the fun
 damental objects in these calculations\, the scattering matrix (S-matrix)\
 , is inspired by a well defined operator in non-relativistic quantum mecha
 nics\, but is plagued with both ultraviolet (UV) and infrared (IR) diverge
 nces in QFT. The UV divergences are now understood through the program of 
 renormalization\, but IR divergences remain an active area of research. We
  have explored three approaches to ameliorate the problem of IR divergence
 s\, all of which will be discussed in this talk: i) The cross section meth
 od using the KLN theorem\, ii) exploiting factorization to modify of the S
 -matrix in theories with massless particles\, and iii) the coherent state 
 formalism. \n\nThe slides of the presentation can be found "here":http://w
 ww.hep.phy.cam.ac.uk/~conference/Hannesdottir_07_04_2020.pdf
LOCATION:Virtual Seminar 
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