Impact of CMS dijets in 5.02 TeV pPb and pp collisions on EPPS16 nuclear PDFs
Eskola, K., Paakkinen, P., & Paukkunen, H. (2019). Impact of CMS dijets in 5.02 TeV pPb and pp collisions on EPPS16 nuclear PDFs. In D. d'Enterria, A. Morsch, & P. Crochet (Eds.), Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Article 124). Sissa Medialab srl. POS Proceedings of Science, 345. https://doi.org/10.22323/1.345.0124
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POS Proceedings of ScienceDate
2019Copyright
© The Authors, 2019
The CMS measurement of dijet pseudorapidity distributions in pPb versus pp collisions at 5.02 TeV provides a probe for 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.
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Sissa Medialab srlConference
International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear CollisionsIs part of publication
Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear CollisionsISSN Search the Publication Forum
1824-8039Keywords
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https://converis.jyu.fi/converis/portal/detail/Publication/33247404
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Research Council of FinlandFunding program(s)
Academy Research Fellow, AoF; Academy Project, AoFAdditional information about funding
The authors have received funding from the Academy of Finland, Project 297058 of K.J.E. and 308301 of H.P.; P.P. acknowledges the financial support from the Magnus Ehrnrooth Foundation. The cross-section calculations were performed within a computing cluster of the Finnish IT Center for Science (CSC) under the Project jyy2580.License
Except where otherwise noted, this item's license is described as CC BY-NC-ND 4.0