Speaker
Description
In high-energy (proton-proton) pp collisions, there can be a substantial contribution from Multi-Parton Interactions (MPI) in particle production mechanisms. In this case, several interactions at the partonic level occur in a single pp collision and this implies a correlation between the particle production and the total event multiplicity. At LHC energies, MPI might occur at hard momentum scales, thus affecting the heavy-quark production. Such an effect can be investigated by studying the correlations between heavy-flavour production and the total charged-particle multiplicity. In this poster, we will present the preliminary results of $\rm{J}/\psi$ production (yield and mean transverse momentum) as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}$ = 13 TeV at forward rapidity (2.5 $< y <$ 4) using the data collected by ALICE. $\rm{J}/\psi$ are reconstructed via $\rm{J}/\psi \rightarrow \mu^{+} + \mu^{-}$ decay channel using the Forward Muon Spectrometer, while the charged-particle multiplicity is obtained from the Silicon Pixel Detector. The results will be compared with several perturbative Quantum Chromodynamics inspired models. A comparison study will be presented with similar measurements for $\Upsilon$ and measurements performed for p$-$Pb collisions as well.
