Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Heavy Ion Collisions and QCD Phases VI

HK 39.6: Vortrag

Mittwoch, 28. Februar 2018, 18:00–18:15, HZO 60

Transverse momentum dependence of J/ψ production in Pb-Pb collisions at √s_NN=5.02 TeV at mid-rapidity with ALICE — •Dennis Weiser for the ALICE collaboration — Physikalisches Institut, Im Neuenheimer Feld 226, Heidelberg

ALICE at the Large Hadron Collider (LHC) provides unique capabilities to study charmonium production at low transverse momenta. In the early and hottest phase of nucleus-nucleus collisions the formation of a Quark-Gluon Plasma (QGP) is expected. Several QGP induced effects, such as the melting of charmonium states due to color screening and/or a (re)combination of uncorrelated charm and anti-charm quarks, can play a role. While a suppression of J/ψ with respect to binary-scaled pp collisions was indeed observed in heavy-ion collisions at all energies, recent measurements in Pb-Pb collisions at √s_NN=2.76 TeV indicate that (re)combination does seem to play an important role in the low p_T region at LHC energies.

At central rapidity, corresponding to the range |y|<0.9, J/ψ are reconstructed down to zero p_T via their decay into two electrons. We will present results on the transverse momentum dependence of inclusive J/ψ production in Pb-Pb collisions at √s_NN=5.02 TeV. In particular, we will present the centrality dependence of the J/ψ average transverse momentum (<p_T>) and the p_T broadening (r_AA=<p_T²>^A−A/<p_T²>^pp).