Speaker
Description
The availability at the LHC of the largest collision energy in pp collisions allows a significant advance in the measurement of $J/\psi$ production as function of event multiplicity. The interesting relative increase observed with data at the LHC at $\sqrt{s} = 7$ TeV and at RHIC at $\sqrt{s} = 200$ GeV is studied now at unprecedented multiplicities for pp collisions. The newest measurement performed at mid-rapidity in pp collisions at $\sqrt{s} = 13$ TeV in the dielectron decay channel, facilitated by triggering on high-multiplicity events, allows the comparison to $J/\psi$ production in p-Pb collisions at similar multiplicities.
We will compare our newest measurements on the $J/\psi$ yields as a function of event multiplicity in pp collisions at $\sqrt{s} = 13$ and 5.02 TeV to those obtained in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV at mid- and forward rapidity and at $\sqrt{s_{\rm NN}} = 8.16$ TeV at forward rapidity. The results are also discussed in comparison to predictions from available theoretical models and to data at lower energies.
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