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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 \(\sqrt{s} = 13\) TeV. These combined effects may help identify a thermalized QCD medium in small collision systems.

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

  • 会议论文

  • 发表日期：

    2025年

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  • Captain R. Singh,
  • Partha Bagchi,
  • Raghunath Sahoo

摘要

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 \(\sqrt{s} = 13\) TeV. These combined effects may help identify a thermalized QCD medium in small collision systems.