Abstract
The existence of dark matter (DM) and the origin of the baryon asymmetry are persistent indications that the SM is incomplete. More recently, the ATLAS and CMS experiments have observed an excess of diphoton events with invariant mass of about 750 GeV. One interpretation of this excess is decays of a new spin-0 particle with a sizable diphoton partial width, e.g. induced by new heavy weakly charged particles. These are also key ingredients in models cogenerating asymmetric DM and baryons via sphaleron interactions and an initial particle asymmetry. We explore what consequences the new scalar may have for models of asymmetric DM that attempt to account for the similarity of the dark and visible matter abundances.
Highlights
In [1, 2] the ATLAS and CMS experiments both report excesses in diphoton final states with invariant masses around 750 GeV
We explore what consequences the new scalar may have for models of asymmetric dark matter (DM) that attempt to account for the similarity of the dark and visible matter abundances
The recently observed excess of diphotons by the ATLAS and CMS experiments may be interpreted as a new spin-0 resonance with a sizable diphoton partial width induced by loops of new EW charged fermions
Summary
In [1, 2] the ATLAS and CMS experiments both report excesses in diphoton final states with invariant masses around 750 GeV. We focus on a possible connection with the origin of DM, motivated by the observation that the same basic ingredients, a new scalar resonance and new weak charged states, can account for the diphoton excess and are required in models of asymmetric DM. One interpretation of the diphoton excess is the s-channel production, via gluon (and photon) fusion, of a new (pseudo) scalar resonance φ with a mass mφ ∼ 750 GeV gg (γγ) → φ → 2γ,. In this paper we explore the possible connection between the asymmetric origin of DM and the excess of diphotons at LHC, interpreted as a new scalar resonance.
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