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.