Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Heavy-Ion Collisions and QCD Phases I

HK 4.1: Group Report

Monday, March 30, 2020, 16:30–17:00, J-HS F

J/ψ production measurements in pp, p-Pb and Pb-Pb collisions at midrapidity with ALICE at the LHC — •Yvonne Pachmayer for the ALICE collaboration — Physikalisches Institut der Universität Heidelberg

J/ψ production is a powerful tool to study the properties of the quark-gluon plasma, since its production is strongly affected by the dense and hot medium created in heavy-ion collisions. In nucleus-nucleus interactions at LHC energies, the charmonium states reveal a smaller suppression with respect to the one measured at lower energies. This is a clear sign of a (re)combination process affecting quarkonium production, which is also confirmed by the measurement of a significant elliptic flow, suggesting a strong participation of the charm quarks in the collectivity of the medium. pp collisions serve not only as an important reference, but also allow quarkonium production models to be constrained and multi-parton interactions to be studied. The influence of cold-nuclear-matter effects is studied in p-Pb collisions.
At midrapidity, the ALICE experiment allows J/ψ production to be measured in the dielectron decay channel down to zero transverse momentum and the prompt and non-prompt contributions to be separated. Further, the electron trigger provided by the Transition Radiation Detector in pp and p-Pb collisions allows the measurements to be extended to intermediate and high transverse momenta.
The large wealth of precise data from the ALICE experiment, recently published and new results from pp, p-Pb and Pb-Pb collisions, will be presented, with comparisons with state-of-the-art theoretical models.