What is the gamma gamma resonance at 750 GeV?

Abstract

Run 2 LHC data show hints of a new resonance in the diphoton distribution at an invariant mass of 750 GeV. We analyse the data in terms of a new boson, extracting information on its properties and exploring theoretical interpretations. Scenarios covered include a narrow resonance and, as preliminary indications suggest, a wider resonance. If the width indications persist, the new particle is likely to belong to a strongly-interacting sector. We also show how compatibility between Run 1 and Run 2 data is improved by postulating the existence of an additional heavy particle, whose decays are possibly related to dark matter.

v2: 45 pages, 12 figures, final. Factor of 2 changed in table 1, 4th row

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• Leptoquarks: 750 GeV Diphoton Resonance and IceCube Events
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Broadening the Reach of Simplified Limits on Resonances at the LHC
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• On a possible large width 750 GeV diphoton resonance at ATLAS and CMS
• A broad 750 GeV diphoton resonance? Not alone
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• Bounds on supersymmetric effective operators from heavy diphoton searches
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• Quarks and Bosons as Composite Particles
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• Interpretation of LHC excesses in ditop and ditau channels as a 400-GeV pseudoscalar resonance
• CP sensitive observables of a hypothetical heavy spin-0 particle with $\gamma \gamma -$interactions dominant
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• Multi-step production of a diphoton resonance
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