Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Schwerionenkollisionen und QCD Phasen

HK 29.2: Vortrag

Dienstag, 5. März 2013, 14:30–14:45, HSZ-201

J/ψ-Hadron Correlations in Proton-Proton Collisions and J/ψ in Proton-Lead Collisions with the Central Barrel of ALICE at the LHC — •Michael Winn — Physikalisches Institut, Universität Heidelberg

The description of J/ψ production in proton-proton (pp) and in proton-nucleus (pA) collisions remains challenging for theory based on perturbative QCD and factorization. Furthermore, the investigation of J/ψ in pp and pA collisions represents an important reference for heavy-ion collisions, where the behaviour of charmonium is seen as a key observable for deconfinement. In this context, in addition to cross section and polarization measurements, azimuthal J/ψ-hadron correlations provide further information constraining the responsible mechanisms at work.

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. First results of azimuthal J/ψ-hadron correlations in pp collisions at a center-of-mass energy of 7 TeV will be shown. Finally, the potential of ALICE for J/ψ measurements in proton-lead collisions with the central barrel will be discussed.