Heavy Leptonium as the Origin of the 750 GeV Diphoton Excess

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 $W^{+}{W}^{-}$, $f\bar{f}$ 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 $2\sigma$ accuracy for $Y_L\approx 4.8-7.2$ 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.

arXiv comment9 pages, 3 figures; Revision of numerical analysis and inclusion of ortho-leptonium analysis

References in corpus (13)

• Parton distributions with QED corrections
• Searches for long-lived charged particles in pp collisions at sqrt(s) = 7 and 8 TeV
• Scattering Light by Light at 750 GeV at the LHC
• Measuring the diphoton coupling of a 750 GeV resonance
• Gluon vs. Photon Production of a 750 GeV Diphoton Resonance
• The production of a diphoton resonance via photon-photon fusion
• 750 GeV diphotons from closed string states
• Probing Colored Particles with Photons, Leptons, and Jets
• Heavy Fermion Bound States for Diphoton Excess at 750GeV $\sim$ Collider and Cosmological Constraints $\sim$
• Asymmetric Dark Matter Bound State
• Hypercharge Axion and the Diphoton $750$ GeV Resonance
• Back to 1974: The $\mathcal{Q}$-onium
• QED and ortho-para- positronium mass difference

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• LHC diphoton excess in a left-right symmetric model with minimal dark matter
• Boosted scalar confronting 750 GeV di-photon excess