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SUMMARY:The KLN theorem meets collinear factorisation
DTSTART:20260611T090000Z
DTEND:20260611T100000Z
DTSTAMP:20260615T030900Z
UID:indico-event-7792@indico.nikhef.nl
DESCRIPTION:Speakers: Zeno Capatti (Bern University)\n\nThe KLN theorem es
 tablishes that infrared divergences in parton‑model diagrams cancel when
  summed alongside diagrams that account for the simultaneous hard interact
 ion of multiple partons within the same hadron. Meanwhile\, it is well est
 ablished that initial-state infrared poles and logarithms are governed by 
 collinear factorisation. In this talk\, I introduce a formalism where an i
 nitial-state implementation of KLN works hand in hand with collinear facto
 risation. I will show that in this framework hadronic cross-sections can b
 e expressed in terms of iterated discontinuities of Feynman diagrams and e
 xpanded in virtuality using standard expansion-by-regions techniques. The 
 leading virtuality contribution will be shown to be equivalent to the MSba
 r parton model result through a universal scheme change. In turn\, this en
 ables the application of the Local Unitarity method to the computation of 
 hadronic cross sections.\n\nhttps://indico.nikhef.nl/event/7792/
LOCATION:Positron (Nikhef)
URL:https://indico.nikhef.nl/event/7792/
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