Open charm production and low x gluons

de Oliveira, E. G.; Martin, A. D.; Ryskin, M. G.

doi:10.1103/physrevd.97.074021

Open charm production and low x gluons

de Oliveira, E. G.; Martin, A. D.; Ryskin, M. G.

Authors

E. G. de Oliveira

A. D. Martin

M. G. Ryskin

Abstract

We compare the rapidity, y, and the beam energy, ffiffi s p , behaviors of the cross section of the data for D meson production in the forward direction that were measured by the LHCb Collaboration. We describe the observed cross sections using NLO perturbative QCD, and choose the optimal factorization scale for the LO contribution which provides the resummation of the large double logarithms. We emphasize the inconsistency observed in the y and ffiffi s p behaviors of the D meson cross sections. The y behavior indicates a very flat x dependence of the gluon PDF in the unexplored low x region around x ∼ 10−5. However, to describe the ffiffi s p dependence of the data we need a steeper gluon PDF with decreasing x. Moreover, an even steeper behavior is needed to provide an extrapolation which matches on to the well known gluons found in the global PDF analyses for x ∼ 10−3. The possible role of nonperturbative effects is briefly discussed.

Citation

de Oliveira, E., Martin, A., & Ryskin, M. (2018). Open charm production and low x gluons. Physical Review D, 97(7), Article 074021. https://doi.org/10.1103/physrevd.97.074021

Journal Article Type	Article
Acceptance Date	Dec 20, 2017
Online Publication Date	Apr 20, 2018
Publication Date	Apr 20, 2018
Deposit Date	May 3, 2018
Publicly Available Date	May 3, 2018
Journal	Physical Review D
Print ISSN	2470-0010
Electronic ISSN	2470-0029
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	97
Issue	7
Article Number	074021
DOI	https://doi.org/10.1103/physrevd.97.074021

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