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dc.contributor.authorPaukkunen, H.
dc.contributor.authorHelenius, I.
dc.contributor.editord'Enterria, David
dc.contributor.editorMorsch, Andreas
dc.contributor.editorCrochet, Philippe
dc.identifier.citationPaukkunen, H.; Helenius, I. (2019). Heavy-flavour production in the SACOT-mT scheme. In d'Enterria, David; Morsch, Andreas; Crochet, Philippe (Eds.) Hard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, POS Proceedings of Science, 345. Sissa Medialab srl, 145. DOI: 10.22323/1.345.0145
dc.description.abstractThe 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.en
dc.publisherSissa Medialab srl
dc.relation.ispartofHard Probes 2018 : International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
dc.relation.ispartofseriesPOS Proceedings of Science
dc.rightsCC BY-NC-ND 4.0
dc.titleHeavy-flavour production in the SACOT-mT scheme
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.rights.copyright© The Authors, 2019
dc.relation.conferenceInternational Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
dc.relation.funderSuomen Akatemiafi
dc.relation.funderSuomen Akatemiafi
dc.relation.funderAcademy of Finlanden
dc.relation.funderAcademy of Finlanden
jyx.fundingprogramAkatemiatutkijan tehtävä, SAfi
jyx.fundingprogramAkatemiahanke, SAfi
jyx.fundingprogramResearch post as Academy Research Fellow, AoFen
jyx.fundingprogramAcademy Project, AoFen
jyx.fundinginformationWe acknowledge the Academy of Finland, Projects 297058 and 308301, as well as the Carl Zeiss Foundation and the state of Baden-Württemberg through bwHPC, for support. The Finnish IT Center for Science (CSC) has provided computational resources for this work.

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