  We consider the effects of the photon isolation on the production of a pair
of photons in hadron collisions. We study in detail advantages and
disadvantages of the standard and smooth cone isolation criteria, concerning
the theory and the experiment. We put special interest in those kinematic
configurations related to recent Higgs boson studies and searches, and finally
we show the set of isolation parameters proposed by the Les Houches accord
2013, which serves as a guide to understand the comparison of the theoretical
predictions with the data.
