  A framework is proposed to describe resonant diphoton phenomenology at hadron
colliders in full generality. It can be employed for a comprehensive
model-independent interpretation of the experimental data. Within the general
framework, few benchmark scenarios are defined as representative of the various
phenomenological options and/or of motivated new physics scenarios. Their usage
is illustrated by performing a characterization of the 750 GeV excess, based on
a recast of available experimental results.
  We also perform an assessment of which properties of the resonance could be
inferred, after discovery, by a careful experimental study of the diphoton
distributions. These include the spin J of the new particle and its dominant
production mode. Partial information on its CP-parity can also be obtained, but
only for $J\geq2$. The complete determination of the resonance CP properties
requires studying the pattern of the initial state radiation that accompanies
the resonant diphoton production.
