A4 Article in conference proceedings
Heavy-flavour production in the SACOT-mT scheme (2019)

Paukkunen, H., & Helenius, I. (2019). Heavy-flavour production in the SACOT-mT scheme. 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 145). Sissa Medialab srl. POS Proceedings of Science, 345. https://doi.org/10.22323/1.345.0145

JYU authors or editors

Publication details

All authors or editors: Paukkunen, H.; Helenius, I.

Parent publication: Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

Parent publication editors: d'Enterria, David; Morsch, Andreas; Crochet, Philippe


  • International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

Place and date of conference: Aix-les-Bains, France, 1.-5.10.2018

Journal or series: POS Proceedings of Science

eISSN: 1824-8039

Publication year: 2019

Number in series: 345

Article number: 145

Publisher: Sissa Medialab srl

Publication country: Italy

Publication language: English

DOI: https://doi.org/10.22323/1.345.0145

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65911

Publication is parallel published: https://arxiv.org/abs/1811.01979


The hadroproduction of heavy-flavoured mesons has recently attracted a growing interest e.g. within the people involved in global analysis of proton and nuclear parton distribution functions, saturation physics, and physics of cosmic rays. In particular, the D- and B-meson measurements of LHCb at forward direction are sensitive to gluon dynamics at small x and are one of the few perturbative small-x probes before the next generation deep-inelastic-scattering experiments. In this talk, we will concentrate on the collinear-factorization approach to inclusive D-meson production and describe a novel implementation — SACOT-mT — of the general-mass variable flavour number scheme (GM-VFNS). In the GM-VFNS framework the cross sections retain the full heavy-quark mass dependence at pT = 0, but gradually reduce to the ordinary zero-mass results towards asymptotically high pT. However, the region of small (but non-zero) pT has been somewhat problematic in the previous implementations of GM-VFNS, leading to divergent cross sections towards pT → 0, unless the QCD scales are set in a particular way. Here, we provide a solution to this problem. In essence, the idea is to consistently account for the underlying energy-momentum conservation in the presence of a final-state heavy quark-antiquark pair. This automatically leads to a well-behaved GM-VFNS description of the cross sections across all pT without a need to fine tune the QCD scales. The results are compared with the LHCb data and a very good agreement is found. We also compare to fixed-order based calculations and explain why they lead to approximately a factor of two lower D-meson production cross sections than the GM-VFNS approach.

Keywords: particle physics

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 0

Last updated on 2022-20-09 at 14:49