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SUMMARY:Locally finite QCD amplitudes and cross sections
DTSTART:20251105T094500Z
DTEND:20251105T110000Z
DTSTAMP:20261010T144100Z
UID:indico-event-11526@indico.mpp.mpg.de
DESCRIPTION:Speakers: Jurlia Karlen (ETH Zürich)\n\nIn this talk I will p
 resent a framework for local subtractions of infrared singularities in had
 ron collider cross sections and amplitudes. The construction is guided by 
 infrared factorization and leads to integrands in loop momentum and phase 
 space that are suitable for integration via numerical methods.\nI will foc
 us on electroweak production via quark–antiquark annihilation at NNLO. T
 o achieve infrared factorization for the two-loop amplitude at the local l
 evel\, a careful construction of the integrand is necessary. Modifications
  are introduced to cure “loop polarizations” and power-like divergence
 s\, which arise in collinear limits from loop corrections to initial-state
  vertices and obstruct local factorization. The tools developed for amplit
 ude integrands also guide the local subtractions at the cross section leve
 l\, where initial-state singularities are factorized locally at the level 
 of partonic integrands\, while final-state singularities cancel in the sum
  of real and virtual contributions. All required subtraction terms are pre
 dominantly constructed from lower-order building blocks with known analyti
 c integrals.\n\nhttps://indico.mpp.mpg.de/event/11526/
LOCATION:A.1.01 - Alps  Süd (MPP)
URL:https://indico.mpp.mpg.de/event/11526/
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