The CMS measurement of the dijet pseudorapidity and transverse momentum distributions in pPb versus pp collisions at 5.02 TeV provides a direct constraint on nuclear gluon PDFs in a wide range of $x$ and $Q^2$ [CMS-PAS-HIN-16-003]. We report on the impact of these data on the EPPS16 nuclear PDFs [Eur.Phys.J. C77, 163]. For this, we have devised a non-quadratic extension of the Hessian PDF reweighting method [JHEP 1412, 100], which now more accurately reflects the impact of a dataset on PDFs. Based on the (preliminary) CMS data on the pPb/pp ratios of normalized dijet cross sections, we predict that the uncertainty in the nuclear gluon modification can be significantly reduced especially in the antishadowing region.
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