Lepton Jets from Radiating Dark Matter

Understand

The idea that dark matter forms part of a larger dark sector is very intriguing, given the high degree of complexity of the visible sector.

• In this paper, we discuss lepton jets as a promising signature of an extended dark sector.
• As a simple toy model, we consider an $\mathcal{O}(\text{GeV})$ DM fermion coupled to a new $U(1)'$ gauge boson (dark photon) with a mass of order GeV and kinetically mixed with the Standard Model photon.
• Dark matter production at the LHC in this model is typically accompanied by collinear radiation of dark photons whose decay products can form lepton jets.