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SUMMARY:Local Unitarity: a representation of differential cross-sections t
 hat is locally free of infrared singularities at any order - Ben Ruijl
DTSTART:20201126T160000Z
DTEND:20201126T170000Z
UID:TALK154396@talks.cam.ac.uk
CONTACT:Rene Poncelet
DESCRIPTION:*The seminar will take place via vidyo "here":https://indico.c
 ern.ch/event/978127/.\nThe explicit url is: https://indico.cern.ch/event/9
 78127/.*\n\nAbstract: One of the major challenges in computing higher-orde
 r corrections of collider observables is the treatment of infrared singula
 rities. Local Unitarity is a novel representation of differential scatteri
 ng cross-sections that locally realises the direct cancellation of infrare
 d singularities exhibited by its so-called real-emission and virtual degre
 es of freedom. We take advantage of the Loop-Tree Duality representation o
 f each individual forward-scattering diagram and we prove that the ensuing
  expression is locally free of infrared divergences\, applies at any pertu
 rbative order and for any process without initial-state collinear singular
 ities. Our representation is especially suited for a numerical implementat
 ion and we demonstrate its practical potential by computing fully numerica
 lly and without any IR counterterm the next-to-leading order accurate diff
 erential cross-section for the process e+ e− -> d d. We also show first 
 results beyond next-to-leading order by computing interference terms part 
 of the N4LO-accurate inclusive cross-section of a 1 -> 2 + X scalar scatte
 ring process.
LOCATION:Virtual Seminar 
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