  We present a model-independent study aimed at characterizing the nature of
possible resonances in the jet-photon or jet-$Z$ final state at hadron
colliders. Such resonances are expected in many models of compositeness and
would be a clear indication of new physics. At leading order, in the narrow
width approximation, the matrix elements are parameterized by just a few
constants describing the coupling of the various helicities to the resonance.
We present the full structure of such amplitudes up to spin two and use them to
simulate relevant kinematic distributions that could serve to constrain the
coupling structure. This also generalizes the signal generation strategy that
is currently pursued by ATLAS and CMS to the most general case in the
considered channels. While the determination of the P/CP properties of the
interaction seems to be out of reach within this framework, there is a wealth
of information to be gained about the spin of the resonance and the relative
couplings of the helicities.
