Measurement of an Excited Charmonium State and the Study of J/ψ Polarization in p+p Collisions at √(s)=200 GeV in PHENIX Experiment at RHIC

We report the J/ψ→e+e- and the ψ'→e+e- production cross sections in the PHENIX experiment at RHIC. The first measurements of the production cross sections of the ψ' and the ψ' over the J/ψ, will contribute to the clarification of the theoretical understanding of the J/ψ meson production. The inclusive J/ψ polarization through the same decay channel is also presented, showing a trend of slightly longitudinal polarization for pT<5 GeV/c.