2020/09/22 by Yanchun Ding, Ding, Yanchun · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2009.10782
In pp collisions at LHC energies, heavy quarks are produced in initial hard scatterings and then these quarks hadronize in either open heavy-flavor hadrons or quarkonia (e.g. J/ψ, ψ(2S), Υ). The study of quarkonium production as a function of charged-particle multiplicity links soft and hard processes and allows one to study their interplay. While a linear increase of quarkonium production as a function of charged-particle multiplicity can be reasonably well understood in the context of multi-parton interactions, the observation of deviations with respect to a linear increase requires a more detailed description of the collision. In this contribution, we will present the latest ALICE measurements at forward rapidity for J/ψ and Υ production as a function of charged-particle multiplicity in pp collisions at √(s)=13 TeV. The first measurement of the double ratios of relative yield of Υ(2S) over Υ(1S) and J/ψ over Υ(1S) as a function of charged-particle multiplicity will also be shown.