The high flux of photons from lead ions at the LHC allows us to study photon-induced reactions in ultra-peripheral collisions (UPC) of Pb$-$Pb nuclei in a new kinematic regime. The study of these collisions, where projectiles do not overlap and hence hadronic interactions are suppressed, provides information about the initial state of nuclei. Coherent charmonium photoproduction is of particular interest since it is sensitive to poorly known gluon shadowing effects in target Pb ions.
The newest ALICE results on vector meson photoproduction in UPC Pb$-$Pb collisions from LHC Run 2 are presented and are compared to current models describing nuclear gluon shadowing.
Volume 367 -
XXIX International Symposium on Lepton Photon Interactions at High Energies (LeptonPhoton2019) -
Posters
Latest ALICE results on coherent $\mathrm J/\psi$ photoproduction in ultra-peripheral Pb$-$Pb collisions at the LHC
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Pre-published on:
November 12, 2019
Published on:
December 17, 2019
Abstract
DOI: https://doi.org/10.22323/1.367.0145
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.