CERN Accelerating science

Article
Title	Charm hadronisation measurements with the ALICE experiment
Author(s)	Giacalone, Marco (Bologna U. ; INFN, Bologna)
Collaboration	ALICE Collaboration
Publication	2022
Number of pages	7
In:	EPJ Web Conf. 270 (2022) 00020
In:	10th International Workshop on QCD - Theory and Experiment (QCD@Work 2022), Lecce, Italy, 27 -30 June 2022, pp.00020
DOI	10.1051/epjconf/202227000020
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ALICE
Abstract	Charm quarks are produced in hard scatterings at the early stages of the hadronic collisions due to the heavy mass of the quark. The production cross section of charm can be described by pQCD calculations based on the factorisation approach. This description traditionally assumes universal fragmentation functions of charm into hadrons among different collision systems.The ALICE experiment measured charmed-baryon production in pp collisions for different baryon species, observing a significant enhancement of the charm baryon-to-meson yield ratios, for pT < 10–12 GeV/c, with respect to measurements performed at e+e− and ep colliders. Measurements of charmed baryon production in pp collisions also provide a fundamental reference for heavy-ion collisions, in which an enhancement of the baryon-to-meson ratio could be due to an additional hadronisation mechanism via coalescence of charm quarks with lighter quarks in a deconfined medium.This contribution discusses the latest measurements of charm production performed by the ALICE Collaboration in pp collisions at the LHC via D mesons, Λc+, Σc0,+,++, Ξc0,+, and Ωc0 baryons at midrapidity at √s = 5.02 and 13 TeV. The most recent measurements of the Λc+/D0 ratio in Pb–Pb collisions at √sNN = 5.02 are also presented, together with the first measurement of the charm fragmentation fraction into hadrons in pp and p–Pb collisions at the same energy.
Copyright/License	© 2022-2025 The Authors (License: CC-BY-4.0)

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