  We study an s-channel resonance $R$ as a viable candidate to fit the diboson
excess reported by ATLAS. We compute the contribution of the $\sim 2$ TeV
resonance $R$ to semileptonic and leptonic final states at 13 TeV LHC. To
explain the absence of an excess in semileptonic channel, we explore the
possibility where the particle $R$ decays to additional light scalars $X,X$ or
$X,Y$. Modified analysis strategy has been proposed to study three particle
final state of the resonance decay and to identify decay channels of $X$.
Associated production of $R$ with gauge bosons has been studied in detail to
identify the production mechanism of $R$. We construct comprehensive categories
for vector and scalar BSM particles which may play the role of particles $R$,
$X$, $Y$ and find alternate channels to fix the new couplings and search for
these particles.
