Wide or Narrow? The Phenomenology of 750 GeV Diphotons

Understand

I perform a combined analysis of the ATLAS and CMS diphoton data, using both Run-I and Run-II results, including those released at the 2016 Moriond conference.

• I find combining the ATLAS and CMS results from Run-II increases the statistical significance of the reported 750 GeV anomaly, assuming a spin-0 mediator coupling to gluons or heavy quarks with a width much smaller than the detector resolution.
• This significance does not decrease when the 8 TeV data is included.
• A spin-2 mediator is disfavored compared to the spin-0 case.