A1 Journal article (refereed)
A QCD analysis of LHCb D-meson data in p+Pb collisions (2020)

Eskola, K. J., Helenius, I., Paakkinen, P., & Paukkunen, H. (2020). A QCD analysis of LHCb D-meson data in p+Pb collisions. Journal of High Energy Physics, 2020(5), Article 37. https://doi.org/10.1007/JHEP05(2020)037

JYU authors or editors

Publication details

All authors or editorsEskola, Kari J.; Helenius, Ilkka; Paakkinen, Petja; Paukkunen, Hannu

Journal or seriesJournal of High Energy Physics



Publication year2020


Issue number5

Article number37

PublisherSpringer; Societa Italiana di Fisica

Publication countryItaly

Publication languageEnglish


Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/69066

Web address of parallel published publication (pre-print)https://arxiv.org/abs/1906.02512


We scrutinize the recent LHCb data for D0-meson production in p+Pb collisions within a next-to-leading order QCD framework. Our calculations are performed in the SACOT-mT variant of the general-mass variable-flavour-number scheme (GM-VFNS), which has previously been shown to provide a realistic description of the LHC p+p data. Using the EPPS16 and nCTEQ15 nuclear parton distribution functions (PDFs) we show that a very good agreement is obtained also in the p+Pb case both for cross sections and nuclear modification ratios in the wide rapidity range covered by the LHCb data. Encouraged by the good correspondence, we quantify the impact of these data on the nuclear PDFs by the Hessian reweighting technique. We find compelling direct evidence of gluon shadowing at small momentum fractions x, with no signs of parton dynamics beyond the collinear factorization. We also compare our theoretical framework to a fixed-order calculation supplemented with a parton shower. While the two frameworks differ in the absolute cross sections, these differences largely cancel in the nuclear modification ratios. Thus, the constraints for nuclear PDFs appear solid.

Keywordsparticle physics

Free keywordsheavy ion phenomenology

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Ministry reportingYes

Reporting Year2020

JUFO rating2

Last updated on 2024-22-04 at 13:19