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We present an updated global analysis of collinearly factorized nuclearparton distribution functions (PDFs) at next-to-leading order in perturbativeQCD. In comparison to our previous fit, EPPS16, the present analysis includesmore data from proton-lead collisions at the Large Hadron Collider: 5TeVdouble-differential CMS dijet and LHCb D-meson data, as well as 8TeV CMSW$^\pm$ data. These new data lead to significantly better-constrained gluondistributions at small and intermediate values of the momentum fraction $x$,confirming the presence of shadowing and antishadowing for gluons in largenuclei. In addition, we include Jefferson Lab measurements of deeply inelasticscattering which probe nuclear PDFs at large $x$ and low virtualities. For thefirst time within the Hessian framework, we now also explore the uncertaintiesof nuclear PDFs due to the errors in the baseline proton PDFs. We release theresults of our analysis as a new public parametrization of nuclear PDFs calledEPPS21.

EPPS21: A global QCD analysis of nuclear PDFs