A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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

JYU-tekijät tai -toimittajat

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Eskola, Kari J.; Helenius, Ilkka; Paakkinen, Petja; Paukkunen, Hannu

Lehti tai sarja: Nuclear Physics A

ISSN: 0375-9474

eISSN: 1873-1554

Julkaisuvuosi: 2021

Volyymi: 1005

Artikkelinumero: 121944

Kustantaja: Elsevier BV

Julkaisumaa: Alankomaat

Julkaisun kieli: englanti

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

Julkaisun avoin saatavuus: Ei avoin

Julkaisukanavan avoin saatavuus:

Rinnakkaistallenteen verkko-osoite (pre-print): https://arxiv.org/abs/2001.10385

Lisätietoja: 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


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.

YSO-asiasanat: hiukkasfysiikka; ydinfysiikka

Vapaat asiasanat: nuclear parton distribution function; proton–nucleus collision; dijet production; open heavy flavour

Liittyvät organisaatiot


Hankkeet, joissa julkaisu on tehty

OKM-raportointi: Kyllä

Raportointivuosi: 2021

Alustava JUFO-taso: 1

Viimeisin päivitys 2021-07-07 klo 17:55