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SUMMARY:Probing Nuclear Parton Distributions and their Radial Dependence u
 sing Jet Photoproduction in Ultra-Peripheral Pb+Pb Collisions with the ATL
 AS Detector at the LHC
DTSTART:20260901T150000Z
DTEND:20260901T170000Z
DTSTAMP:20260914T001700Z
UID:indico-event-34110@indico.bnl.gov
CONTACT:ptribedy@bnl.gov
DESCRIPTION:Speakers: Benjamin Gilbert (Lawrence Livermore National Labora
 tory)\n\nAbstract: In ultra-peripheral collisions (UPCs)\, emitted photons
  may participate in a hard-scattering process with partons within the stru
 ck nucleus\, providing a clean\, energetic probe of its parton distributio
 ns. This talk presents measurements of jet production in UPCs performed wi
 th the ATLAS detector using high-statistics 2018 Pb+Pb data. Events are se
 lected using requirements on jet production\, forward neutron emission\, a
 nd rapidity gaps are then used to statistically separate inclusive photo-n
 uclear\, photo-diffractive\, and two-photon hard-scattering processes. The
  measured photo-nuclear cross-sections are compared to theoretical models 
 in phase-space regions where significant nuclear PDF modifications are exp
 ected but not well constrained by world data\, demonstrating the potential
  of these data to provide a strong new constraint on nuclear PDF effects. 
 Additionally\, measurements of jet production in UPCs where neither nucleu
 s emits forward neutrons are performed. These processes provide a novel me
 thod for probing the radial dependence of nuclear modifications within the
  target. Studies of jet production without forward neutron emission also m
 ake possible the first measurement of diffractive jet photo-production in 
 nuclear collisions\, which will provide direct input for constraining exis
 ting models. The implications of each of these measurements for possible f
 uture measurements at the EIC will also be discussed.\n\nhttps://indico.bn
 l.gov/event/34110/
LOCATION:Small seminar room (Bldg 510 Physics)
URL:https://indico.bnl.gov/event/34110/
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