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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Heavy Ion Collisions and QCD Phases VIII

HK 39.7: Vortrag

Donnerstag, 30. März 2017, 15:45–16:00, F 1

Charmonium production in heavy-ion collisions at LHC energies with the statistical hadronisation model — Anton Andronic¹, Peter Braun-Munzinger¹, •Markus K. Köhler², and Johanna Stachel² — ¹Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — ²Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

Charmonia are an important tool to investigate the fundamental properties of the early phases of a heavy-ion collision (HIC). Due to their high mass, charm quarks are not produced thermally, but only in initial hard scatterings. Matsui and Satz [1] showed, if a deconfined medium is formed, a Debye-like colour screening prevents the formation of J/ψ and a suppression with respect to the expectation from binary collision scaling should be observed. It was predicted within the statistical hadronisation model [2] that, since the charm cross section increases significantly as a function of collision energy, an enhanced charmonium production is expected for LHC energies in comparison to lower energies.
In this contribution, we compare the production of J/ψ calculated within the statistical hadronisation model with available J/ψ yields measured at the LHC. The centrality as well as the rapidity dependence will be investigated.
T. Matsui and H. Satz, Phys. Lett. B 178 (1986) 178
P. Braun-Munzinger and J. Stachel, Phys. Lett. B 490 (2000) 196