Study of $J/\psi$ Production in $\sqrt{s_{NN}} = 200$ GeV $p+p$ and   $d+Au$ Collisions in PHENIX
  $J/\psi$ measurements in $p+p$ and $d+Au$ collisions serve as crucial references to understand the $J/\psi$ production in $Au+Au$ collisions at RHIC where quark gluon plasma (QGP) is expected to be formed. They also provide important clues to study various interesting phenomena such as the gluon shadowing and color glass condensate. We report the latest results from PHENIX experiment on $J/\psi$ production in $p+p$ and $d+Au$ collisions at forward, backward and midrapidity. 
W. Xie (for the PHENIX Collaboration)