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 editorsPaukkunen, H.; Helenius, I.

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

Parent publication editorsd'Enterria, David; Morsch, Andreas; Crochet, Philippe

Conference:

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

Place and date of conferenceAix-les-Bains, France1.-5.10.2018

Journal or seriesPOS Proceedings of Science

eISSN1824-8039

Publication year2019

Number in series345

Article number145

PublisherSissa Medialab srl

Publication countryItaly

Publication languageEnglish

DOIhttps://doi.org/10.22323/1.345.0145

Publication open accessOpenly available

Publication channel open accessOpen Access channel

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

Publication is parallel publishedhttps://arxiv.org/abs/1811.01979


Abstract

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.


Keywordsparticle physics


Contributing organizations


Related projects


Ministry reportingYes

Reporting Year2019

JUFO rating0


Last updated on 2024-11-03 at 14:25