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SUMMARY:Taking the First Steps Toward Higgs and Drell-Yan Production at N4
 LO in QCD: the Single-real Ingredient
DTSTART:20260605T193000Z
DTEND:20260605T213000Z
DTSTAMP:20260624T211700Z
UID:indico-event-10575@indico.slac.stanford.edu
DESCRIPTION:Speakers: Adi Suresh (SLAC)\n\nSince the discovery of the Higg
 s boson\, particle physics has entered a precision era in which theoretica
 l predictions must match the standards accuracy of LHC measurements. Inclu
 sive Higgs-boson production in gluon fusion and Drell–Yan production are
  central benchmark processes in this effort. While the structure of pertur
 bative QCD corrections is already rich at NLO\, each successive order intr
 oduces new challenges: additional unresolved radiation\, higher-loop ampli
 tudes\, more intricate infrared singularities\, and novel color structures
 . Understanding how this complexity evolves is a prerequisite for pushing 
 precision predictions to N4LO.\nIn this talk\, I will present recent progr
 ess toward the N4LO inclusive cross sections for gluon-fusion Higgs produc
 tion and Drell–Yan production. The focus will be on the single-real cont
 ributions\, involving three QCD partons together with a Higgs boson or a v
 irtual photon. These terms consist of the interference of one-loop and two
 -loop amplitudes\, as well as the interference of tree-level and three-loo
 p amplitudes. The latter is presented in the generalized leading-color lim
 it\, which appears to provide a promising approximation for exploring N4LO
  phenomenology.\nThese single-real contributions provide more than isolate
 d ingredients for the full N4LO result: they form a laboratory for studyin
 g the analytic structures that emerge at this order. Addressing this compl
 exity requires new computational technology capable of organizing and simp
 lifying such structures efficiently. As part of this effort\, we introduce
  CIFAR\, a Mathematica package for reducing color factors to general Casim
 ir invariants of simple compact Lie algebras. The calculation therefore se
 rves both as a concrete step toward N4LO phenomenology and as a case study
  in the computational challenges of extending collider predictions to unpr
 ecedented perturbative precision.\n\nhttps://indico.slac.stanford.edu/even
 t/10575/
LOCATION:48/2-224 - Madrone (SLAC)
URL:https://indico.slac.stanford.edu/event/10575/
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