Uncovering tau leptons-enriched semi-visible jets at the LHC.

This Letter proposes a new signature for confining dark sectors at the Large Hadron Collider. Under the assumption of a QCD-like hidden sector, hadronic jets containing stable dark bound states could manifest in proton-proton collisions. We present a simplified model with a boson yielding the production of jets made up of dark bound states and subsequently leading to the decays of those that are unstable to leptons and Standard Model quarks.

Is the Decay of the Higgs Boson to a Photon and a Dark Photon Currently Observable at the LHC?

Many attempts have been made to observe the decay of the Higgs boson to a photon and an invisible massless dark photon. For this decay to be potentially observable at the LHC, new mediators that communicate between the standard model and the dark photon must exist. In this Letter, we study bounds on such mediators coming from the Higgs signal strengths, oblique parameters, electric dipole moment of the electron, and unitarity.