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We consider a simple solution to explain the recent diboson excess observedby ATALS and CMS Collaborations in models with custodial symmetry $SU(2)_L\times SU(2)_R \rightarrow SU(2)_c$. The $SU(2)_L$ triplet vector boson $\rho$with mass range of $1.8 \sim 2$ TeV would be produced through the Drell-Yanprocess with sizable diboson decay branching to account for the excess. Theother $SU(2)_L \times SU(2)_R$ bidoublet axial vector boson $a$ would cancelall deviations of electroweak obervables induced by $\rho$ even if the SMfermions mix with some heavy vector like (composite) fermions which couple to$\rho$ ("non-universally partially composite"), therefore allows arbitrarycouplings between each SM fermion and $\rho$. We present our model in the"General Composite Higgs" framework with $SO(5) \times U(1)_X \rightarrow SO(4)\times U(1)_X$ breaking at scale $f$ and demand the first Weinberg sum rule andpositive gauge boson form factors as the theoretical constraints. We find thatour model can fit the diboson excess very well if the left-handed SM lightquarks, charged leptons and tops have zero, zero/moderately small andmoderate/large composite components for reasonable values of $g_\rho$ and $f$.The correlation between tree level $S$ parameter and the $h \rightarrow Z\gamma$ suggest a large $a$ contribution to $h \rightarrow Z \gamma$ and it isindeed a $\mathcal{O}(1)$ effect in our parameter space which provides a stronghint for our scenario if this diboson excess is confirmed by the $13 \sim 14$TeV LHC Run II.

Low Scale Composite Higgs Model and 1.8 $\sim$ 2 TeV Diboson Excess