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Rapid thermalization in ultra-relativistic heavy-ion collisions leads to fastchanging potential between a heavy quark and antiquark from zero temperaturepotential to the finite temperature one. Time dependent perturbation theory canthen be used to calculate the survival probability of the initial quarkoniumstate. In view of very short time scales of thermalization at RHIC and LHCenergies, we calculate the survival probability of $J/\psi$ and $\Upsilon$using sudden approximation. Our results show that quarkonium decay may besignificant even when temperature of QGP remains low enough so that theconventional quarkonium melting due to Debye screening is ineffective.

Quarkonia Disintegration due to time dependence of the $q \bar{q}$ potential in Relativistic Heavy Ion Collisions