Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Heavy-Ion Collisions and QCD Phases V

HK 24.1: Gruppenbericht

Dienstag, 29. März 2022, 16:00–16:30, HK-H1

Measurements of J/ψ production at midrapidity with ALICE at the LHC — •Minjung Kim for the ALICE collaboration — Physikalische Institut, Unversität Heidelberg, Heidelberg, Germany

The measurement of J/ψ production in heavy-ion collisions has been used as a valuable tool to study the properties of the quark*gluon plasma (QGP) since charm quarks are mainly produced via initial hard scatterings. Especially at LHC energies, the production of low transverse momentum J/ψ, which can be measured precisely with the ALICE (A Large Ion Collider Experiment) detector, is sensitive to the regeneration mechanism. Measurements of J/ψ production in p*Pb collisions provide an opportunity to study cold–nuclear–matter effects as well as possible final state mechanisms, which can modify its production with respect to the one in pp collisions.
Based on the electron identification capability provided by the Time Projection Chamber (TPC) installed at midrapidity, J/ψ production is measured via the dielectron decay channel in ALICE. In addition, it is possible to statistically separate the contribution of J/ψ from a weak decays of beauty hadrons (non-prompt J/ψ) using the long life time of beauty hadrons, relying on excellent track pointing resolution provided by the Inner Tracking System (ITS).
In this presentation, we will show latest measurements of J/ψ production in p-Pb and Pb-Pb collisions at midrapidity by ALICE, in comparison with theoretical calculations.