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SUMMARY:Extending GENEVA to New Resolution Variables for Precise NNLO+PS E
 vent Generation
DTSTART:20261016T120000Z
DTEND:20261016T130000Z
DTSTAMP:20260915T185400Z
UID:indico-event-19033@indico.global
DESCRIPTION:Speakers: Alessandro Gavardi (University of Torino)\n\nPrecise
  predictions for LHC processes rely on combining multi-loop fixed-order pe
 rturbative calculations with parton showers. Consistently combining the tw
 o is a long-standing challenge\, which becomes a critical point in the imp
 lementation of state-of-the-art NNLO QCD Monte Carlo event generators. GEN
 EVA is one such tool\, and achieves this combination by resumming a chosen
  "resolution variable" to high logarithmic accuracy. Even though the choic
 e of the resolution variable is critical in determining both which logarit
 hms are controlled to high accuracy and how naturally the calculation inte
 rfaces with the shower\, until recently\, most of the GENEVA implementatio
 ns relied only on standard N-jettiness.\nIn this talk\, I will present two
  case studies where we explore the use of new resolution variables in an N
 NLO+PS generator for the first time. In the first\, we resum the leading-j
 et transverse momentum at NNLL′ precision in the process of W-W+ product
 ion\, directly matching the jet-veto observable used by experimentalists t
 o suppress top-quark backgrounds. In the second\, we combine the N3LL resu
 mmation of the color-singlet transverse momentum with a pT-like definition
  of 1-jettiness in the context of Higgs production in heavy-quark annihila
 tion\, a process where the Higgs qT spectrum is a key handle on the Yukawa
  couplings to light quarks. Achieving NLL′ accuracy for the 1-jet resolu
 tion variable required revamping key parts of the GENEVA method. I will di
 scuss them and present a selection of phenomenological results comparing w
 ith ATLAS and CMS data.\n\nhttps://indico.global/event/19033/
LOCATION:Bohr Conference room 6th floor (Schuster Building)
URL:https://indico.global/event/19033/
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