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SUMMARY:[NT/RBRC Seminar] Cristian Pisano\, Azimuthal asymmetries in lepto
 n and heavy-quark pair production in UPCs
DTSTART:20250711T150000Z
DTEND:20250711T170000Z
DTSTAMP:20260514T200800Z
UID:indico-event-27300@indico.bnl.gov
DESCRIPTION:In this talk I will discuss azimuthal modulations in lepton an
 d heavy-quark pair production in ultraperipheral collisions (UPCs) of high
 ly charged ions.  A full description of the cross section in terms of Gen
 eralized Transverse Momentum Dependent parton distributions (GTMDs) for ph
 otons is given including a consideration of the Fourier transform to impac
 t parameter space. In particular\, this leads to a feed-in mechanism among
  harmonics of different orders\, which in principle generates harmonics of
  all (even) orders. We show that the normalized differential cross section
  changes considerably with the produced particle mass\, which should be di
 scernible in UPCs at RHIC and LHC. For the numerical results we adopt seve
 ral models for the photon GTMD correlator\, and find that all of them are 
 in fairly good agreement with each other and with UPC data from STAR. We a
 lso present results for various azimuthal modulations for RHIC kinematics 
 and compare e+ e− production with the production of heavier particles. T
 hese results exhibit interesting mass-dependent features in the asymmetrie
 s that may help study the anisotropies arising from the underlying photon 
 GTMD description.\n\nhttps://indico.bnl.gov/event/27300/
URL:https://indico.bnl.gov/event/27300/
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