A1 Journal article (refereed)
Impact of dijet and D-meson data from 5.02 TeV p+Pb collisions on nuclear PDFs (2021)


Eskola, K. J., Helenius, I., Paakkinen, P., & Paukkunen, H. (2021). Impact of dijet and D-meson data from 5.02 TeV p+Pb collisions on nuclear PDFs. Nuclear Physics A, 1005, Article 121944. https://doi.org/10.1016/j.nuclphysa.2020.121944


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Publication details

All authors or editors: Eskola, Kari J.; Helenius, Ilkka; Paakkinen, Petja; Paukkunen, Hannu

Journal or series: Nuclear Physics A

ISSN: 0375-9474

eISSN: 1873-1554

Publication year: 2021

Volume: 1005

Article number: 121944

Publisher: Elsevier BV

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.nuclphysa.2020.121944

Publication open access: Not open

Publication channel open access:

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2001.10385

Additional information: Part of special issue:
The 28th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions: Quark Matter 2019
Edited by Feng Liu, Enke Wang, Xin-Nian Wang, Nu Xu, Ben-Wei Zhang


Abstract

We discuss the new constraints on gluon parton distribution function (PDF) in lead nucleus, derivable with the Hessian PDF reweighting method from the 5.02 TeV p+Pb measurements of dijet (CMS) and D0-meson (LHCb) nuclear modification ratios. The impact is found to be significant, placing stringent constraints in the mid- and previously unconstrained small-x regions. The CMS dijet data confirm the existence of gluon anti-shadowing and the onset of small-x shadowing, as well as reduce the gluon PDF uncertainties in the larger-x region. The gluon constraints from the LHCb D0 data, reaching down to x ∼ 10−5 and derived in a NLO perturbative QCD approach, provide a remarkable reduction of the small-x uncertainties with a strong direct evidence of gluon shadowing. Furthermore, we find a good description of the data even down to zero D0-meson transverse momentum within a purely DGLAP-based approach without a need for imposing any non-linear effects. Importantly, the constraints obtained from the dijet and D0 data are mutually fully consistent, supporting the universality of nuclear PDFs in hard-scattering processes.


Keywords: particle physics; nuclear physics

Free keywords: nuclear parton distribution function; proton–nucleus collision; dijet production; open heavy flavour


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Ministry reporting: Yes

Reporting Year: 2021

Preliminary JUFO rating: 1


Last updated on 2021-07-07 at 17:55