Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Heavy-Ion Collisions and QCD Phases III

HK 15.1: Gruppenbericht

Dienstag, 31. März 2020, 17:00–17:30, J-HS F

Measurements of charm-baryon production with ALICE at the LHC — •Andrea Dubla for the ALICE collaboration — GSI Helmholtz Center for Heavy Ion Research

Heavy quarks (charm and beauty) are an effective tool to study the properties of the Quark-Gluon Plasma (QGP) formed in heavy-ion collisions at the LHC. Due to their large masses, they are produced during the early stages of the collisions in hard-scattering processes, on a time scale shorter than the QGP formation time. Thus, they experience the whole evolution of the system.

The measurement of charm baryons and mesons allows the baryon-to-meson ratio to be evaluated, probing hadronisation and thermalisation mechanisms of charm quarks in the medium. In particular, the baryon-to-meson ratio is expected to be enhanced if charm quarks hadronise via recombination with the surrounding light quarks in the QGP.

The ALICE detector is well suited to reconstruct charm baryons down to low transverse momentum thanks to the excellent tracking and particle identification capabilities. In this contribution, new ALICE results on charm-meson and baryon production in Pb-Pb and in pp collisions will be shown. In the pp system, the measurement of Λc and Ξc0 production will be discussed. In the Pb-Pb system, the measurement of Λc production, the nuclear modification factor and the Λc/D0 ratio will be discussed together with the comparison with similar results in smaller collision systems. Moreover, the comparison of the results to theoretical models will be shown.

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