Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Heavy Ion Collision and QCD Phases IX

HK 40.5: Talk

Wednesday, March 16, 2016, 17:45–18:00, S1/01 A01

J/ψ production in pp collisions at √s = 13 TeV with ALICE at the LHC — •Steffen Weber for the ALICE collaboration — Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt

Charmonium production is a unique probe for the hot and dense deconfined medium created in ultrarelativistic heavy-ion collisions. Produced in the initial hard collisions, the charm and anticharm quarks maintain their identity throughout the lifetime of the medium, whereas the subsequent creation of charmonium states is subject to the influence of the hot medium.

The measurement of J/ψ in pp collisions serves as a baseline for the quantification of hot and dense medium effects in heavy-ion collisions, but it is also an important probe for perturbative and non-perturbative aspects of quantum chromo dynamics, the theory of strong interactions.

The ALICE experiment at CERN has unique capabilities to measure J/ψ production down zero transverse momentum both at midrapidity in the dielectron decay channel and at forward rapidities in the dimuon decay channel.

In this talk a first analysis of J/ψ production at midrapidity in pp collisions at √s = 13 TeV will be presented. A comparison to production at √s = 7 TeV and prospects on further measurements will be provided.