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SUMMARY:QCD Factorisation and Super-Super Leading Logarithms
DTSTART:20260603T080000Z
DTEND:20260603T090000Z
DTSTAMP:20260617T192000Z
UID:indico-event-17707@indico.global
DESCRIPTION:Speakers: Jack Holguin\n\nIn this seminar\, I will demonstrate
  that the cumulative distribution of the event-shape observable one-jettin
 ess (τ₁) in colour-singlet + jet production at hadron colliders receive
 s a factorisation-breaking term of order αₛ⁴ ln⁶(1/τ₁) relative 
 to the Born process. I will lead into this discussion by recapping develop
 ments in the understanding of factorisation breaking and super-leading log
 arithms in the gaps-between-jets observable\, and by discussing the origin
  of factorisation breaking as a breakdown of QCD coherence in the initial 
 state via Coulomb/Glauber gluon exchange. The factorisation-breaking logar
 ithms in one-jettiness are one power higher than the previously identified
  super-leading logs\; nevertheless\, no new poles appear. Consequently\, I
  argue that the usual factorisation of parton distribution functions at th
 e scale μ ≈ τ₁ Q remains valid. I will also comment on the colour st
 ructure of the one-jettiness super-super-leading logarithm\, hinting at it
 s resummation.\n\n \n\n\nhttps://indico.global/event/17707/
LOCATION:Aula Wataghin
URL:https://indico.global/event/17707/
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