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'Enterria, David; Morsch, Andreas; Crochet, Philippe (Eds.) Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, POS Proceedings of Science, 345. Sissa Medialab srl, 124. DOI: 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:

International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

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: http://doi.org/10.22323/1.345.0124

Open Access: Publication published in an 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


Contributing organizations


Related projects

Parton distributions and QCD matter in LHC nuclear collisions
Eskola, Kari
Academy of Finland
01/09/2016-31/08/2020


Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 0


Last updated on 2020-18-08 at 13:26