Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Heavy-Ion Collisions and QCD Phases V

HK 24.3: Talk

Tuesday, March 29, 2022, 16:45–17:00, HK-H1

J/ψ production as a function of charged-particle multiplicity in pp collisions at the LHC — •Ailec de la Caridad Bell Hechavarria for the ALICE collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster

The increase of the inclusive J/ψ yields as a function of charged-particle multiplicity was found to be stronger than linear in previous ALICE publications, where both J/ψ and the charged-particle multiplicity were measured at midrapidity. The causes for this behavior have been investigated in previous studies with PYTHIA8 and attributed to possible auto-correlation effects. Insight on this effect could be gained by measuring the charged-particle multiplicity in three azimuth regions relative to the direction of the J/ψ.

Data collected with ALICE at the LHC during Run 2 is used to investigate the relative J/ψ yield, measured at mid-rapidity (|y|<0.9) in its di-electron decay channel and as a function of the charged-particle multiplicity, in various regions of the azimuthal angle with respect to the emission of the J/ψ meson.

In this contribution, new measurements of this correlation performed in pp collisions at √s=13 TeV TeV will be shown.

*Supported by DFG under GRK2149