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Sep 24 – 29, 2023
US/Eastern timezone

Vector meson photoproduction in UPC with ALICE

Sep 26, 2023, 2:44 PM
18m
Meeting Room 3-4 (Durham Convention Center)

Meeting Room 3-4

Durham Convention Center

Talk 3D Structure of the Nucleon: GPDs and Form Factors Joint GPD/Nuclear

Speaker

valeri pozdnyakov

Description

The ALICE Collaboration has studied photonuclear interactions in ultra-peripheral heavy-ion collisions to probe gluon dynamics of protons and nuclei in a new kinematic regime at the LHC.

Several new measurements will be presented, including the coherent J/ψ photoproduction cross section, measured as a function of the Mandelstam |t|, which provides constraints of models that consider the transverse profile of the target at very low Bjorken-x.

The polarization of coherent J/psi photoproduction has been measured
for the first time and found to be compatible with transverse polarization.

Both exclusive and, for the first time at LHC, dissociative J/ψ photoproduction cross section have been measured in proton targets.

Finally, the energy dependence of the photonuclear cross section is presented for photon-nuclear energies from 17 GeV up to 920 GeV and for the Bjorken-x down to $10^{−5}$, exploring a new regime of super dense gluons.

Primary author

Presentation materials