Inclusive and diffractive dijet photoproduction in UPCs at the LHC in NLO QCD

Abstract

We present a next-to-leading order QCD calculation of inclusive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC and show that the results agree very well with various kinematic distributions measured by the ATLAS collaboration. The effect of including these data in nCTEQ or EPPS16 nuclear parton density functions (nPDFs) is then studied using the Bayesian reweighting technique. For an assumed total error of 5\% on the final data, its inclusion would lead to a significant reduction of the nPDF uncertainties of up to a factor of two at small values of the parton momentum fraction. As an outlook, we discuss future analyes of diffractive nPDFs, which are so far completely unknown.

Comments: 7 pages, 5 figures, 1 table. Proceedings of the EPS Conference on High-Energy Physics (EPS-HEP 2019), Ghent, Belgium