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SUMMARY:Opening loops into trees: the loop-tree duality at work - German S
 borlini (IFIC\, Valencia)
DTSTART:20170512T150000Z
DTEND:20170512T163000Z
UID:TALK72565@talks.cam.ac.uk
CONTACT:Dr Maria Ubiali
DESCRIPTION:Nowadays there are many NLO QCD results available and some pro
 cesses are being calculated up to NNLO (even NNNLO) accuracy. However\, th
 e presence of singularities in the intermediate steps forces the introduct
 ion of regularizators and the complexity of the computations increases. In
  particular\, cancelling infrared singularities in QCD requires to combine
  virtual (i.e. loop) and real (i.e. extra-radiation) contributions\, keepi
 ng track of the divergent parts in both terms. This leads to analytical co
 mplications specially when massive particles are involved. Through the app
 lication of the loop-tree duality theorem\, we provide a new framework to 
 unify the treatment of real and virtual contribution. In consequence\, the
  divergences are directly cancelled at integrand level\, i.e. before integ
 ration takes place\, thus leading to a purely four-dimensional numerical i
 mplementation. In this talk\, we discuss some recent applications of our f
 ramework.
LOCATION:Seminar Room B\, Rutherford Building\, Cavendish Laboratory
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