Heavy Leptonium as the Origin of the 750 GeV Diphoton Excess

2016/04/11 by Neil D. Barrie, Archil Kobakhidze, Barrie, Neil D. +7
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #hep-ex #hep-ph

paper · pdf · doi:10.48550/arxiv.1604.02803

9 pages, 3 figures; Revision of numerical analysis and inclusion of ortho-leptonium analysis

arxiv created 2016/06/10 · arxiv updated 2016/06/13

Abstract

We propose a hypothetical heavy leptonium, the scalar bound state of an exotic lepton-antilepton pair, as a candidate for the recent 750 GeV resonance in the early LHC Run 2 data. Such a para-leptonium is dominantly produced via photon-photon fusion at the LHC and decays into a photon pair with a significant branching fraction. In addition, our model predicts a companion spin-1 ortho-leptonium bound state, which can decay to W⁺W^-, ff and three photons. Under the LHC and the electroweak precision observables bounds, we find that the observed excess of 750 GeV diphoton events can be explained within 2σ accuracy for Y_L ≈ 4.8 - 7.2 for the minimal case in our scenario. The observation of the ortho-leptonium in the dilepton channel will be the smoking gun for our scenario.

Related

• The 750 GeV LHC diphoton excess from a baryon number conserving string model
• A spartan model for the LHC diphoton excess
• The 750 GeV excess from photon-photon and quark-quark processes
• Characterising the 750 GeV diphoton excess
• SU(2) x SU(2) x U(1) Interpretation on the 750 GeV Diphoton Excess