Speaker
Description
We study striking multilepton signatures predicted by a broad class of Beyond-the-Standard-Model scenarios featuring a fermionic portal to a new dark gauge sector. Focusing on the muon-portal realisation with vector dark matter (MPVDM), we demonstrate that six-muon final states arise as a generic and robust collider signature across the full viable parameter space, independently of dark-matter-specific assumptions.
The signal originates from pair production of heavy vector-like leptons, each decaying into three muons through cascade decays mediated by new gauge and scalar states. Such $VLL \to 3 \mu$ decays are themselves highly distinctive and point to a well-defined class of BSM theories with extended gauge structure and fermionic portals. The resulting six-muon signature is essentially background-free, kinematically rich, and experimentally clean.
We present an optimised collider strategy for probing this channel, including event reconstruction, selection criteria, and sensitivity estimates. Current LHC data already provide meaningful constraints, while the High-Luminosity LHC offers excellent discovery potential. Our results highlight multilepton final states, in particular six-muon events, as powerful and largely unexplored probes of new fermionic sectors beyond the Standard Model.
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