Date/time: 11/06/2012, 3:30PM

Title: J/\psi Measurement in 39, 62 and 200 GeV center of mass energies in Au+Au collisions at PHENIX

(Ph D defense)

Speaker: Abhisek Sen
Host: Prof Xiaochun He (PhD committee chair)
Abstract: $J/\psi$ production is considered as one of the very important probes for studying the properties of quark-gluon plasma (QGP). In PHENIX experiment at Brookhaven National Laboratory, we observed a large suppression of $J/\psi$ production in Au+Au collisions at 200 GeV center of mass energy in comparison with binary collision scaled p+p collisions. The level of this suppression is similar to that observed in other energies in CERN-SPS and LHC. Recently PHENIX also took $J/\psi$ data from Au+Au collisions at $\sqrt{s_{NN}}=$ 39 and 62 GeV. This data allow us to explore the energy dependent suppression level in order to disentangle the important contributing factors of $J/\psi$ production. I will highlight the $J/\psi$ results in a very wide range of center of mass energies 39-200 GeV in PHENIX and a comprehensive comparion with other experiments.