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We present a measurement of inclusive $J/\psi$ production at mid-rapidity($|y|<1$) in $p+p$ collisions at a center-of-mass energy of $\sqrt{s}$ = 200GeV with the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). Thedifferential production cross section for $J/\psi$ as a function of transversemomentum ($p_T$) for $0<p_T<14$ GeV/$c$ and the total cross section arereported and compared to calculations from the color evaporation model and thenon-relativistic Quantum Chromodynamics model. The dependence of $J/\psi$relative yields in three $p_T$ intervals on charged-particle multiplicity atmid-rapidity is measured for the first time in $p+p$ collisions at $\sqrt{s}$ =200 GeV and compared with that measured at $\sqrt{s}$ = 7 TeV, PYTHIA8 andEPOS3 Monte Carlo generators, and the Percolation model prediction.

$J/\psi$ production cross section and its dependence on charged-particle multiplicity in $p+p$ collisions at $\sqrt{s}$ = 200 GeV