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SUMMARY:[RBRC seminar] Bridging the Parton picture with the Color Glass Co
 ndensate
DTSTART:20260709T170000Z
DTEND:20260709T183000Z
DTSTAMP:20260716T174500Z
UID:indico-event-32735@indico.bnl.gov
DESCRIPTION:Speakers: Diego Padilla (UCLA)\n\nFactorization with parton di
 stributions and the Color Glass Condensate (CGC) effective field theory ar
 e two widely used frameworks for computing cross sections in QCD. Although
  these approaches are formulated in terms of different degrees of freedom 
 — interactions between individual partons versus coherent scattering off
  a shockwave— there are kinematic regions where both descriptions should
  be applicable and therefore mutually consistent. To investigate this conn
 ection\, we derive GTMDs\, GPDs\, TMDs\, PDFs\, and diffractive TMDs in th
 e shockwave/CGC limit at leading order [1]. For PDFs and GPDs\, we encount
 er divergences that require renormalization. Through this renormalization 
 procedure\, we obtain the finite small-x parts of these distributions for 
 the first time and recover the corresponding collinear evolution equations
 . Using these PDFs and GPDs\, expressed in terms of dipole amplitudes\, we
  verify the matching between CGC scattering amplitudes and their collinear
 -factorization counterparts for DIS\, DVCS\, and DVMP  to leading order [
 2]. This matching is performed by taking the large-Q^2 limit on the CGC si
 de and using the small-x expansion of the parton distributions on the coll
 inear-factorization side. Our results establish a systematic framework for
  matching Parton distributions and the CGC\, opening the way toward extens
 ions beyond leading order.\n[1] Shohini Bhattacharya\, Chuan-Qi He\, Zhong
 -Bo Kang\, Diego Padilla\, Jani Penttala\, arXiv:2510.02254 [hep-ph].[2] S
 hohini Bhattacharya\, Chuan-Qi He\, Zhong-Bo Kang\, Diego Padilla\, Jani P
 enttala\, arXiv:2605.14092 [hep-ph].\n\nhttps://indico.bnl.gov/event/32735
 /
LOCATION:2-160 (https://bnl.zoomgov.com/j/1600983728?pwd=RAD7OLcqre7Ycsp6J
 fFp6HAnpyLxex.1)
URL:https://indico.bnl.gov/event/32735/
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