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arXiv · 1601.04751

Wide or Narrow? The Phenomenology of 750 GeV Diphotons

Matthew R. Buckley
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Abstract

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. The cross section required to fit the ATLAS anomaly is in tension with the aggregate data, all of which prefers a smaller value. The best fit for all models I consider is a $4.0σ$ local significance for a 750 GeV spin-0 mediator coupling to gluons with a cross section of 4 fb at 13 TeV (assuming narrow width) or 10~fb (assuming $Γ=45$ GeV).

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Matthew R. Buckley. 2016-05-04. Wide or Narrow? The Phenomenology of 750 GeV Diphotons. https://doi.org/10.1140/epjc%2Fs10052-016-4201-y

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