Multiplicity dependence of J/$\psi$ production at midrapidity in pp collisions at $\sqrt{s}$ = 13 TeV

Abstract

Measurements of the inclusive J/$\psi$ yield as a function of charged-particle pseudorapidity density $\mathrm{d}{N}_{\mathrm{ch}}/\mathrm{d}\eta$ in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE at the LHC are reported. The J/$\psi$ meson yield is measured at midrapidity ($|y|<0.9$) in the dielectron channel, for events selected based on the charged-particle multiplicity at midrapidity ($|\eta |<1$) and at forward rapidity ($-3.7<\eta <-1.7$ and $2.8<\eta <5.1$); both observables are normalized to their corresponding averages in minimum bias events. The increase of the normalized J/$\psi$ yield with normalized $\mathrm{d}{N}_{\mathrm{ch}}/\mathrm{d}\eta$ is significantly stronger than linear and dependent on the transverse momentum. The data are compared to theoretical predictions, which describe the observed trends well, albeit not always quantitatively.

22 pages, 7 captioned figures, 2 tables, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/6220

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