A4 Article in conference proceedings
Impact of CMS dijets in 5.02 TeV pPb and pp collisions on EPPS16 nuclear PDFs (2019)

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

JYU authors or editors

Publication details

All authors or editors: Eskola, K.; Paakkinen, P.; Paukkunen, H.

Parent publication: Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

Parent publication editors: d'Enterria, David; Morsch, Andreas; Crochet, Philippe

Conference:

Place and date of conference: Aix-les-Bains, France, 1.-5.10.2018

Journal or series: POS Proceedings of Science

eISSN: 1824-8039

Publication year: 2019

Number in series: 345

Article number: 124

Publisher: Sissa Medialab srl

Publication country: Italy

Publication language: English

DOI: https://doi.org/10.22323/1.345.0124

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65923

Publication is parallel published: https://arxiv.org/abs/1812.05438

Abstract

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.

Keywords: particle physics; nuclear physics

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Ministry reporting: Yes

VIRTA submission year: 2019

JUFO rating: 0