Probing QGP with Charmonium in p-p Collisions at the LHC Energies

Abstract

The rapidly changing QCD environment which possibly existed in ultra-relativistic hadronic collisions at the LHC, might led charmonium through a non-adiabatic evolution. We analyze the pre-equilibrium state of QCD matter using a temperature-independent Hamiltonian, transitioning to a finite temperature model at thermal equilibrium. A bottom-up thermalization approach determines the effective temperature for pre-equalibrium, followed by a Gubser-type expansion for thermized QCD medium. Along with non-adiabatic evolution of charmonium states, we study how collisional damping, gluonic dissociation, and regeneration impact charmonium yields in p-p collisions at s=13 TeV. These combined effects may help identify a thermalized QCD medium in small collision systems. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.