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The resonance $S$ at $\sim 750$ GeV in the diphoton channel observed by ATLASand CMS, if it holds up, is almost certainly the ($S$)cion of a larger dynastyin a UV completion that may very well be connected to the hierarchy problem. Atthis stage, however, an effective field theory framework provides a useful wayto parametrize searches for this resonance in other channels. Assuming that theexcess is due to a new scalar or pseudoscalar boson, we study associatedproduction of $S$ ("$S$-strahlung") at the LHC and propose searches in severalclean channels like $\gamma\gamma\ell\ell$, $\gamma\gamma\ell\eslash$ and$\ell\ell\ell\gamma\eslash$ to probe dimension-5 operators coupling $S$ toStandard Model gauge bosons. We consider a range of widths for $S$, from 5 GeVto 45 GeV, and find that the three channels probe complementary regions ofparameter space and the suppression scale $\Lambda$. The finding of mostimmediate relevance is that with 3 fb$^{-1}$, the LHC might already reveal newexcesses in the $\gamma\gamma\ell\ell$ channel and a 5(3) $\sigma$ discoverymay already be possible after collecting 65(25) fb$^{-1}$ of data with$\ell\ell\ell\gamma\eslash$ events if the scale of the new physics is within$\sim $ 9 TeV for couplings respecting 8 TeV LHC bounds and compatible with theobserved excess in diphotons for a wide resonance as suggested by the ATLASCollaboration. Beyond the EFT parametrization, we found realizations of modelswith heavy vector-like quarks and leptons which can simultaneously fit thediphoton excess and be discovered in the channels proposed here.

The 750 GeV $S$-cion: Where else should we look for it?