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The existence of a 750 GeV di-photon spin-0 resonance $S$ would imply theadditional presence of new particles beyond the Standard Model, couplingdirectly to $S$ and electromagnetically charged. For an $SU(2)_{\mathrm{L}}$singlet $S$, we explore the possibility of probing the $SU(2)_{\mathrm{L}}$ and$U(1)_{\mathrm{Y}}$ quantum numbers of the new states at the LHC bymeasuring/constraining the $WW$, $Z\gamma$ and $ZZ$ decays of $S$. We obtainrobust prospects on the required LHC integrated luminosity to discover the newdecay modes of $S$, and discuss the implications of these measurements forprobing the electroweak nature of the new states. We also discuss the impact of$S$ mixing with the SM Higgs in such probes.

Is it $SU(2)_{\mathrm{L}}$ or just $U(1)_{\mathrm{Y}}$? $750$ GeV di-photon probes of the electroweak nature of new states