  We investigate the prospects for spin determination of a heavy diboson
resonance using angular observables. Focusing in particular on boosted fully
hadronic final states, we detail both the differences in signal efficiencies
and distortions of differential distributions resulting from various jet
substructure techniques. We treat the 2 TeV diboson excess as a case study, but
our results are generally applicable to any future discovery in the diboson
channel. Scrutinizing ATLAS and CMS analyses at 8 TeV and 13 TeV, we find that
the specific cuts employed in these analyses have a tremendous impact on the
discrimination power between different signal hypotheses. We discuss modified
cuts that can offer a significant boost to spin sensitivity in a post-discovery
era. Even without altered cuts, we show that CMS, and partly also ATLAS, will
be able to distinguish between spin 0, 1, or 2 new physics diboson resonances
at the $2\sigma$ level with 30 fb$^{-1}$ of 13 TeV data, for our 2 TeV case
study.
