Associated $J/ψ+ γ$ production as a probe of the polarized gluon distribution

Abstract

Associated production of $J/ψ$ and a $γ$ has recently been proposed as clean probe of the gluon distribution. The same mechanism can be used to probe the polarized gluon content of the proton in polarized proton-proton collisions. We study $J/ψ+ γ$ production at both polarized fixed target and polarized collider energies.