Speakers
Description
The charm quarks are mainly produced by primordial hard scatterings in the early stage of the ultra-relativistic heavy-ion collisions. The produced charm quarks propagate through the dense QGP medium formed in such collisions and lose energy during their entire path of travel. The QGP is a statistical system of dynamic colour charges, it can also be characterised by stochastic chromo-electromagnetic field fluctuations. These chromo-electromagnetic field fluctuations in the QGP cause an energy gain of charm quarks of all momentum, significantly at the lower momentum limit. The motion of these charm quarks can be described by Langevin transport equations and the underlying evolving medium can be modeled by the (3 + 1)-D relativistic viscous hydrodynamics.
In this contribution, we have studied the effect of the chromo-electromagnetic field fluctuations on $J/\psi$ suppression at RHIC and LHC energies. The nuclear modification factors ($R_{AA}$) of $J/\psi$ have been calculated at RHIC and LHC energies by considering the effect of the field fluctuations. The results are compared with the experimentally measured $R_{AA}$ of $J/\psi$ by ALICE and CMS experiments at $\sqrt {s_{NN}} = 2.76 $ TeV and by PHENIX experiment at $\sqrt {s_{NN}} = 200$ GeV. The experimental measurements can be nicely described with the effect of these field fluctuations without invoking the regeneration phenomena.
