  We compute the isolated photon production in association with a charged
hadron at mid rapidity in $pp$ and $pA$ based on the Color Glass Condensate
(CGC) framework of high energy QCD where, for the first time, we incorporate
the Sudakov effect of soft gluon emissions. Our results are based on the
leading order $q g \to q \gamma$ channel in the CGC framework and confronted
with the recent data from RHIC and LHC concerning the angular distributions and
out-of-plane transverse momentum distributions. We find that, while the CGC
computation alone results in too narrow distributions, with the help of the
Sudakov effect, we can get a satisfactory description of the data. With this as
a benchmark, we provide predictions for the magnitude of the nuclear effect
brought by the phenomena of gluon saturation in the CGC.
