Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Heavy Ion Collisions and QCD Phases VIII
HK 39.8: Vortrag
Donnerstag, 30. März 2017, 16:00–16:15, F 1
Measurement of the J/ψ elliptic flow at mid-rapidity in Pb−Pb collisions at √sNN = 5.02 TeV. — •Pascal Dillenseger for the ALICE collaboration — Goethe Universität
J/ψ measurements at √sNN = 2.76 TeV Pb−Pb collisions clearly show a smaller suppression than the one expected from color screening, when compared to binary-scaled pp collisions. An answer to this behavior is presented by models containing a regeneration component. In these models a possible (re)combination of (un)correlated cc-quarks enhances the J/ψ production.
Since those cc-quarks interact with the bulk medium before forming a J/ψ, they should be coupled to the medium flow. Hence the measurement of the elliptic flow (v2) for J/ψ imposes strong constraints on the J/ψ production models in high energy Pb−Pb collisions.
The ALICE experiment at the Large Hadron Collider (LHC) is a unique tool to study J/ψ. It is able to measure the J/ψ→e+e− decay channel at mid-rapidity (|y|<0.9) and down to pT=0. New preliminary results on the v2 of J/ψ measured in the e+e− decay channel with ALICE in Pb−Pb collisions at √sNN = 5.02 TeV will be presented.