Inclusive and Diffractive Dijet Photoproduction in Ultraperipheral Pb-Pb Collisions at the LHC
Year: 2025
Type: conference-paper
Abstract: In this contribution, we summarize NLO pQCD predictions for inclusive and diffractive dijet photoproduction in Pb-Pb UPCs at the LHC. We demonstrate that the theory describes well the preliminary ATLAS data on the inclusive cross section, which probes nuclear parton distributions (PDFs) down to x_A ~ 0.005 and which can reduce current uncertainties of the small-x nuclear gluon distribution by approximately a factor of 2. Employing predictions of the leading twist approach to nuclear shadowing for nuclear diffractive PDFs, we calculate the cross section of diffractive dijet photoproduction and show that its x_gamma} dependence is sensitive to the effect of nuclear shadowing and the mechanism of QCD factorization breaking in hard diffraction. We also find that due to large leading twist nuclear shadowing and restricted kinematics, the diffractive contribution to the inclusive cross section of dijet photoproduction does not exceed 5-10%, which helps with an ambiguous interpretation of the ATLAS data.
DOI: 10.17161/w85e0h13
Author: Vadim Guzey
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1003533401, THEORETICAL STUDIES IN HIGH ENERGY NUCLEAR PHYSICS, Yoctosecond imaging of QCD collectivity using jet observables, G222768804, Center of Excellence in Quark Matter, THEORETICAL STUDIES IN HIGH ENERGY NUCLEAR PHYSICS, Nuclear parton distributions and QCD matter properties from LHC data, THEORETICAL STUDIES IN HIGH ENERGY NUCLEAR PHYSICS, Center of Excellence in Quark Matter
OpenAlex ID: W4408326345