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SUMMARY:The Fate of Ultra-Collinear Modes in On-Shell Massive Sudakov Form
  Factors
DTSTART:20260505T090000Z
DTEND:20260505T100000Z
DTSTAMP:20260520T035900Z
UID:indico-event-11898@indico.mpp.mpg.de
DESCRIPTION:Speakers: Jakob Schönleber (TUM)\n\nIndividual multi-loop dia
 grams for the massive Sudakov form factor contain an infinite tower of ult
 ra-collinear momentum regions. We show that\, for the on-shell form factor
  in QCD\, these contributions cancel to all orders as a consequence of gau
 ge invariance\, so the leading-power SCETII factorization formula is uncha
 nged. Using the η rapidity regulator\, we compute the soft function and t
 he massive jet function of the quark and gluon Sudakov form factors throug
 h two loops and resum logarithms at NNLL accuracy\, including hierarchies 
 of fermion masses. We also show that with a gauge-boson mass regulator\, t
 he infinite tower of modes is truncated and ultra-collinear and ultra-soft
  modes become manifest and factorize explicitly\, providing a direct EFT d
 erivation of the regulated infrared dependence. \n\nhttps://indico.mpp.mp
 g.de/event/11898/
LOCATION:A.1.01 - Alps  Süd (MPP)
URL:https://indico.mpp.mpg.de/event/11898/
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