Elliptic flow as a probe for the ψ(2S) production mechanism in relativistic heavy ion collisions

摘要

I discuss the elliptic flows of ψ(2S) with different production mechanisms in s_(NN)~(1/2) = 2.76 TeV Pb-Pb collisions. If the final ψ(2S)s are mainly from the recombination of uncorrelated charm and anticharm quarks at T ≈ T_c, charm and anticharm quarks will carry large collective flows of the bulk medium, which will be inherited by the regenerated ψ(2S)s. This indicates a larger elliptic flow of ψ(2S) than that of J/ψ which can be regenerated at T ≥ T_c, ν_2~(ψ(2S)) ＞ ν_2~(J/ψ) . However, if the final ψ(2S)s are mainly from the transitions of J/ψ → ψ(2S) caused by the color screening of quark-gluon plasma its elliptic flow should be close to the elliptic flow of J/ψ, ν_2~(ψ(2S)) ～ ν_2~(J/ψ). Therefore, ψ(2S) elliptic flow is a sensitive probe for its production mechanisms in relativistic heavy ion collisions.