Abstract
In comparison with J/ψ, the excited charmonium state ψ^\prime is loosely bounded and its yield is dominantly from the B-hadron decay. Based on the transport approach, we study the double ratio of N(ψ^\prime)/N(J/ψ) from A+A collisions to that from p+p collisions at LHC energy. We found that the primordial production in the initial stage and the regeneration in the hot medium are not significant for ψ^\prime production in heavy ion collisions at LHC and the double ratio in semi-central and central collisions is controlled by the B decay.
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