TY - JOUR T1 - Confronting lattice parton distributions with global QCD analysis Y1 - 2020 A1 - Jacob Bringewatt A1 - N. Sato A1 - W. Melnitchouk A1 - Jian-Wei Qiu A1 - F. Steffens A1 - M. Constantinou AB -

We present the first Monte Carlo based global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs) that includes nucleon isovector matrix elements in coordinate space from lattice QCD. We investigate the degree of universality of the extracted PDFs when the lattice and experimental data are treated under the same conditions within the Bayesian likelihood analysis. For the unpolarized sector, we find rather weak constraints from the current lattice data on the phenomenological PDFs, and difficulties in describing the lattice matrix elements at large spatial distances. In contrast, for the polarized PDFs we find good agreement between experiment and lattice data, with the latter providing significant constraints on the spin-dependent isovector quark and antiquark distributions

UR - https://arxiv.org/abs/2010.00548 ER -