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SUMMARY:Andrey Pikelner\, "Simplifying N-jettiness soft function calculati
 ons at higher orders"
DTSTART:20261007T120000Z
DTEND:20261007T140000Z
DTSTAMP:20261021T114800Z
UID:indico-event-19374@indico.global
DESCRIPTION:Precision predictions in QCD require accounting for radiation 
 that is too soft or too close to another particle to be resolved as a sepa
 rate jet. The N-jettiness variable is sensitive to this radiation and prov
 ides a useful tool for higher-order calculations. The associated soft func
 tions are essential ingredients in higher-order subtraction schemes\, but 
 their calculation becomes increasingly difficult at each new order.\nIn th
 is talk\, I will describe a simpler way to calculate these functions. I wi
 ll first review our semi-analytic calculation of the zero-jettiness soft f
 unction at N³LO and explain its main challenges. I will then introduce an
  approach that separates a simpler inclusive contribution from a correctio
 n that restores the exact measurement. At NNLO\, this correction is finite
  and can be evaluated directly by numerical integration. I will show how t
 he method works for both massless and massive hard partons\, and how simpl
 e subtraction extends it to an independent N³LO zero-jettiness calculatio
 n. I will conclude with possible extensions to N³LO dipole contributions 
 for an arbitrary N-jettiness soft function.\n\nhttps://indico.global/event
 /19374/
URL:https://indico.global/event/19374/
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