We report on the measurement of $\rm{ J}/\psi$ production in the dielectron channel at mid-rapidity (|y|<1) in p+p and d+Au collisions at $\sqrt{ s_{ NN}}$ = 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider. The transverse momentum $p_{ T}$ spectra in p+p for $p_{ T}$ < 4 GeV/c and d+Au collisions for $p_{ T}$ < 3 GeV/c are presented. These measurements extend the STAR coverage for $\rm{ J}/\psi$ production in p+p collisions to low $p_{ T}$. The $<p_{ T}^{ 2}>$ from the measured $\rm{ J}/\psi$ invariant cross section in p+p and d+Au collisions are evaluated and compared to similar measurements at other collision energies. The nuclear modification factor for $\rm{ J}/\psi$ is extracted as a function of $p_{ T}$ and collision centrality in d+Au and compared to model calculations using the modified nuclear Parton Distribution Function and a final-state $\rm{ J}/\psi$ nuclear absorption cross section.
Categories: nucl-ex