Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Heavy Ion Collisions and QCD Phases 1

HK 5.3: Talk

Monday, March 23, 2015, 15:15–15:30, T/HS1

J/ψ Production in Proton-Lead Collisions with the Central Barrel of ALICE at the LHC — •Michael Winn for the ALICE collaboration — Physikalisches Institut, Universitaet Heidelberg

The investigation of J/ψ in p-A collisions represents an important reference for heavy-ion collisions, where charmonium production is seen as a key observable for deconfinement. Furthermore, the description of J/ψ production in proton-proton and its nuclear modification in proton-nucleus collisions remains challenging for theory based on perturbative QCD and factorization. The central-barrel detectors of ALICE (|η| < 0.9) are well suited to detect J/ψ in its dielectron decay channel and the associated charged tracks in the same event with full azimuthal coverage.

Final results of the nuclear modification factor of inclusive J/ψ in proton-lead collisions with the central barrel of ALICE, both integral as well as differential in transverse momentum, will be presented. Model comparisons will be discussed. First results on the multiplicity dependence will be also shown.