The constraints on the signal are:<p><pre><code>  decays into 2 photons, so must be a boson, integer spin, probably 0, 1 or 2
  both signals are 45Gev wide and look like the Higgs signal.
  ATLAS has a 1.6TeV bump at 2.5 Sigma, potentially a resonance.
  ATLAS has 747 GeV at 3.6 Sigma, CMS 766 GeV at 2.6 Sigma - combines to 4 Sigma although the Look Elsewhere Effect is disputed.
  ATLAS run1 at 8TeV did not see the signal.
  ATLAS has a 2.2 sigma for the 2 TeV excess that CMS saw in Run1, potentially indicating the 750GeV is a composite particle.
</code></pre>
4 Sigma diPhoton excesses have turned out to be random fluctuations before.<p><a href="http:&#x2F;&#x2F;resonaances.blogspot.fr&#x2F;2015&#x2F;12&#x2F;a-new-boson-at-750-gev.html" rel="nofollow">http:&#x2F;&#x2F;resonaances.blogspot.fr&#x2F;2015&#x2F;12&#x2F;a-new-boson-at-750-ge...</a><p><a href="http:&#x2F;&#x2F;motls.blogspot.co.uk&#x2F;2015&#x2F;12&#x2F;first-batch-of-9-pheno-papers-on-new.html" rel="nofollow">http:&#x2F;&#x2F;motls.blogspot.co.uk&#x2F;2015&#x2F;12&#x2F;first-batch-of-9-pheno-p...</a><p><a href="http:&#x2F;&#x2F;www.math.columbia.edu&#x2F;~woit&#x2F;wordpress&#x2F;?p=8174" rel="nofollow">http:&#x2F;&#x2F;www.math.columbia.edu&#x2F;~woit&#x2F;wordpress&#x2F;?p=8174</a>