Multiplicity Dependence of Charmonia Suppression in pp Collisions at the LHC Energies

The ultra-relativistic heavy-ion collisions at energies available at the RHIC and LHC promise the rich physics of the QCD matter, which is proposed to have existed for a brief period after the few microseconds of the big-bang. However, investigating such an exotic medium in these collisions was challenging, and the reasons were obvious from the physics perspective. The quarkonium suppression proposed by Matsui and Satz [1] and observed at RHIC and LHC energies opened up the possibility for an indirect study of QGP formation in heavy-ion collisions. The suppressed production of quarkonia in heavy-ion collisions is measured by scaling its production with pp collisions where QGP-like medium is most unlikely to exist. Nevertheless, in recent observations in pp collision, a few QGP-like phenomena have been seen. Getting motivated by these recent observations, we attempted to study the charmonium suppression to investigate the existence of QGP medium in ultrarelativistic pp collisions. In this work UMQS model is used to study the multiplicity (dNch/dη) and transverse momentum (pT ) dependent suppression of J/ψ and ψ(2S) in pp collisions at mid-rapidity [2, 3].