München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Heavy-Ion Collisions and QCD Phases II

HK 11.6: Talk

Monday, March 18, 2019, 18:00–18:15, HS 15

Multiplicity dependence of J/ψ production in proton-proton collisions at √s= 13 TeV with ALICE at the LHC — •Steffen Georg Weber for the ALICE collaboration — Westfälische Wilhelms-Universität Münster

The hadronic production of charmonium in proton-proton collisions is a complex and intrinsically multi-scale process. The dependence of J/ψ production on the event multiplicity is of special interest, since it relates the hard-scale cc production with the soft-scale physics of light-flavour particle production. Insights into the influence of multiple-parton interactions (MPI) on charmonium production can be obtained.

In this talk the measurement of J/ψ production at mid-rapidity in transverse-momentum intervals as a function of the charged-particle multiplicity in pp collisions at √s = 13 TeV perfomed with ALICE at the LHC will be presented. The influence of a rapidity gap between the J/ψ signal and the multiplicity is investigated. The results are compared to theoretical model predictions and interpreted based on simulation studies with the PYTHIA 8 event generator in terms of MPI, color reconnection and auto-correlation effects.