Volume 476 - 42nd International Conference on High Energy Physics (ICHEP2024) - Strong Interactions and Hadron Physics
Path integral treatment of coherence effects in charmonium production in nuclear ultra-peripheral collisions
J. Obertova* and J. Nemchik
*: corresponding author
Full text: pdf
Pre-published on: December 17, 2024
Published on: April 29, 2025
Abstract
We present for the first time a revised study of
charmonium production in nuclear ultra-peripheral collisions (UPC)
based on a rigorous Green function formalism.
This formalism allows for the proper incorporation of the effects of color transparency, as well as the quantum coherence inherent
in the higher twist quark shadowing related to the $Q\bar Q$
Fock component of the photon. The significance of this effect
gradually decreases towards forward and/or backward rapidities.
In the LHC kinematic region we additionally incorporate within
the same formalism the leading twist gluon shadowing corrections
related to higher multi-gluon photon fluctuations. They represent
a dominant source of nuclear phenomena in the mid-rapidity region.
Model predictions for the rapidity distributions $d\sigma/dy$
are in good agreement with available UPC data on coherent
charmonium production at RHIC and the LHC. They can also be
verified by future measurements at the LHC, as well as at EIC.
DOI: https://doi.org/10.22323/1.476.0505
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