Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Heavy Ion Collisions and QCD Phases XII

HK 59.6: Talk

Friday, March 31, 2017, 15:45–16:00, F 3

J/ψ production as a function of charged-particle multiplicity in pp collisions at √s= 13 TeV with ALICE at the LHC — •Steffen Weber for the ALICE collaboration — Research Division and ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt — Institut für Kernphysik, Technische Universität Darmstadt, Schlossgrabenstr. 9, 64289 Darmstadt

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 charmonium production with the soft-scale physics of light-flavour particle production, and can give insight into the influence of multiple-parton interactions on the charmonium production. A previous measurement at √s = 7 TeV showed an approximately linear increase of J/ψ yield with event multiplicity.

In this talk the measurement of J/ψ production as a function of charged-particle multiplicity in pp collisions at √s = 13 TeV measured with ALICE at the LHC will be presented. By using triggers selecting events with high particle multiplicity the reach of the measurement could be extended to values of the event multiplicity of 8 times the average value in minimum bias collisions, expanding the reach by about a factor 2 compared to the results obtained with data at √s = 7 TeV.