Volume 345 - International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes2018) - Initial State
Impact of CMS dijets in 5.02 TeV pPb and pp collisions on EPPS16 nuclear PDFs
K. Eskola, P. Paakkinen* and H. Paukkunen
*: corresponding author
Full text: pdf
Pre-published on: January 12, 2019
Published on: April 24, 2019
Abstract
The CMS measurement of dijet pseudorapidity distributions in pPb versus pp collisions at 5.02 TeV provides a direct probe on nuclear gluon PDFs. We show that while the predicted pPb pseudorapidity distributions suffer from sizable free-proton PDF uncertainties, the ratios of the pPb and pp distributions are practically insensitive to scale and free-proton PDF choices. We find the CMS data on pPb to pp ratios to be in good agreement with the EPPS16 nuclear modifications. Using a non-quadratic extension of the Hessian PDF reweighting method, we study the impact of these data on the EPPS16 nuclear PDFs. Relative to EPPS16, we find stronger evidence for mid-$x$ gluon antishadowing as well as indication for larger gluon shadowing at small $x$. The data are also able to further constrain the gluon PDF in the EMC region.
DOI: https://doi.org/10.22323/1.345.0124
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