Identifying the origin of the 146-GeV excess at the LHC

Abstract

The 146-GeV excess in the electron-muon final state reported by the CMS Collaboration offers a tantalizing hint for new physics. There are two competing explanations for the origin of the 146-GeV resonance: production via mixing with the Standard Model Higgs boson and leptophilic production through sea electrons and muons inside the proton. In anticipation that such an excess may still persist by the end of LHC Run 3, we propose three related production channels $Hγ$, $H j$, and $H jj$, which could be used to distinguish between these two possible scenarios. Taking the two-Higgs-doublet model (2HDM) as an explicit example, we estimate that with $3000~\text{fb}^{-1}$ of the high-luminosity LHC data, the $Hγ$ channel can provide a striking discriminating power between the mixing and leptophilic scenarios with a significance of 7.1. Combining it with the other two channels, $H j$ and $H jj$, the significance can be pushed up to 7.6.