26-31 July 2021
Mexico City
Mexico/General timezone
HADRON 2021 is over. Thanks for making it a success!
- hadron2021@nucleares.unam.mx
Contact information
Contribution Leading parallel
Mexico City
-
QCD and Hadron Structure
Probing gluons with exclusive production in UPCs at the LHC
Abstract
J/ψ photoproduction off protons in ultra-peripheral p-Pb collisions are used to probe the gluon density at low Bjorken-x. The J/ψ photoproduction cross section is expected to grow as a power law with 1/x, unless gluon saturation occurs at low x. The ALICE collaboration measured it down to x∼3×10-5: the power law increase continues without significant change. With 2016 data, new constraints on the gluonic structure of the proton down to x∼8×10-6 can be obtained.