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SUMMARY:Gluon production in Proton-Nucleus collisions from BCFW recursion
DTSTART:20260917T100000Z
DTEND:20260917T110000Z
DTSTAMP:20261006T070900Z
UID:indico-event-19089@indico.global
DESCRIPTION:Speakers: Francois Gelis\n\nIn the Color Glass Condensate fram
 ework\, the colliding projectiles are described as classical color current
 s. Gluon production at leading order in the coupling is obtained from the 
 retarded solution of the classical Yang-Mills equations\, with these curre
 nts acting as sources. However\, while the final gluon spectrum is gauge i
 nvariant\, the classical color field from which it is obtained is gauge de
 pendent. This makes the intermediate steps of this approach unnecessarily 
 complicated\, as some effort is spent to also determine the gauge dependen
 t part of the field\, which is then discarded when one calculates a gauge 
 invariant observable.\nIn this work\, we use a generalization of BCFW recu
 rsion applicable to off-shell gluons in order to calculate directly the ga
 uge independent gluon production amplitude. This approach allows all manip
 ulations to be performed in terms of gauge invariant amplitudes instead of
  gauge dependent Feynman diagrams\, and therefore provides a gauge agnosti
 c way to obtain the result.\n\nhttps://indico.global/event/19089/
URL:https://indico.global/event/19089/
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