Transverse Single Spin Asymmetry Measurement with J/Psi in Polarized p+p   Collisions at RHIC
  The PHENIX experiment has measured transverse single spin asymmetry of J/$\Psi$ in polarized p+p collisions at forward rapidity at $\sqrt{s}=200$ GeV. The data were collected from year 2006 run of RHIC with average beam polarization of 56%. At RHIC energy, heavy quark production is dominated by gluon gluon interaction. Therefore, the transverse single spin asymmetry in J/$\Psi$ production can provide a clean measurement of the gluon Sivers distribution function. 
Han Liu (for the PHENIX Collaboration)