Impact of CMS dijets in 5.02 TeV pPb and pp collisions on EPPS16 nuclear PDFs
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.
Main Authors
Format
Conferences
Conference paper
Published
2019
Series
Subjects
Publication in research information system
Publisher
Sissa Medialab srl
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-201910174495Use this for linking
Review status
Peer reviewed
ISSN
1824-8039
DOI
https://doi.org/10.22323/1.345.0124
Conference
International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
Language
English
Published in
POS Proceedings of Science
Is part of publication
Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
Citation
- 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
License
Funder(s)
Research Council of Finland
Research Council of Finland
Funding program(s)
Akatemiatutkija, SA
Akatemiahanke, SA
Academy Research Fellow, AoF
Academy Project, AoF
Additional 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.
Copyright© The Authors, 2019