Nuclear pdfs from x=0.001 to x=1

by Mark Strikman (Pennsylvania State University (US))

Friday 2 Jun 2017, 14:00 → 15:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

We review progress in the theoretical and experimental studies of nuclear pdfs in a wide range of x. For small x an important development is the observation of the large screening of the cross section of J/psi coherent photoproduction in ultraperipheral heavy ion collisions. We explain that it is consistent with predictions of the theory of leading twist shadowing based on the application of the QCD factorization theorem for hard diffraction and unitarity. The theory also provides a dynamical model of gluon antishadowing at x~0.1. Progress in understanding of the EMC effect is related to the studies of the nucleon – nucleon short range correlations(SRC) in nuclei performed using hard probes at BNL and Jlab. These studies provide a strong evidence for the dominance of the SRCs in the EMC effect and provide strong constraints on the models of the EMC effect. Possible connection between the origin of the EMC effect and the pattern of centrality dependence of the forward jet production in pA collisions at the LHC is explained. Importance of further experimental studies of nuclear pdfs, including the study of the dijet production in pA scattering in the x_A > 1 kinematics is emphasized.