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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Heavy-Ion Collisions and QCD Phases I

HK 4.2: Vortrag

Montag, 30. März 2020, 17:00–17:15, J-HS F

Studies on Midrapidity J/ψ Production as a Function of Charged-Particle Multiplicity in different regions of the azimuthal angle with ALICE — •Ailec de la Caridad Bell Hechavarria for the ALICE collaboration — Westfaelische Wilhelms-Universitaet Muenster. Institut fuer Theoretische Physik

The study of the J/ψ meson in correlation with the charged-particle multiplicity is a key observable for the separation of the hard and soft scales, governing, respectively, the production and hadronization of the cc pair. Experimentally ALICE studies have shown a stronger than linear relative increase of the inclusive J/ψ production at midrapidity as a function of the charged-particle multiplicity in proton-proton collisions. To shed light on the causes for this behavior Monte Carlo simulations were performed with PYTHIA 8 and the studies attributed part of this behavior to autocorrelation effects. In this regard, interesting results were obtained studying the correlation of the J/ψ production with the charged-particle multiplicity in different regions of the azimuthal angle with respect to the flight direction of the J/ψ meson. With data collected at the LHC with ALICE experiment on proton-proton collisions at √s=13 TeV, current results at midrapidity (|y|<0.9) of the J/ψ in correlation with the charged-particle multiplicity in three defined regions of the azimuthal angle (toward, transverse and away) will be shown and compared to predictions from the PYTHIA 8 Monte Carlo generator.