Speaker
Description
We present results of our calculations of cross sections of inclusive and diffractive dijet photoproduction in ultraperipheral collisions (UPCs) of heavy ions at the CERN Large Hadron Collider using next-to-leading order perturbative QCD. We demonstrate that our approach provides a good description of the dijet cross section measured by the ATLAS Collaboration, which exhibits 10-20% nuclear modifications. We study the role of this data on nuclear parton distribution functions (nPDFs) using the Bayesian reweighting technique and find that the measurements of dijet photoproduction in heavy-ion UPCs at the LHC can reduce current uncertainties of nPDFs at small x by a factor of 2. We also quantify the potential of diffractive dijet photoproduction in UPCs to shed light on the disputed mechanism of factorization breaking for the resolved-photon contribution.
