Asymmetric Dark Matter Models and the LHC Diphoton Excess

TL;DR

This paper investigates how the 750 GeV diphoton excess observed at the LHC could be explained by a new scalar particle, and explores its implications for asymmetric dark matter models that relate dark matter and baryon asymmetries.

Contribution

It links the LHC diphoton excess to asymmetric dark matter models, proposing a new scalar particle as a common origin and analyzing its impact on these models.

Findings

The new scalar can decay into diphotons with a sizable rate.

Implications for models linking dark matter and baryon asymmetries.

Potential constraints on model parameters from LHC data.

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.