  We perform an exploratory study of the role of coherent, medium-induced
energy loss in azimuthal angular correlations in dihadron production in Deep
Inelastic Scattering (DIS) at small $x$ where the target proton/nucleus is
modeled as a Color Glass Condensate. In this approach coherent radiative energy
loss is part of the higher order corrections to the leading order dihadron
production cross section. We include the effects of both gluon saturation and
coherent radiative energy loss and show that radiative cold-matter energy loss
has a significant effect on the so-called coincidence probability for the back
to back production of dihadrons in DIS. We also define a double ratio of
coincidence probabilities for a nucleus and proton targets and show that it is
very robust against higher order radiative corrections.
