Speaker
Description
The Fermionic Portal to Vector Dark Matter (FPVDM) framework generically predicts six-fermion final states arising from pair production of heavy vector-like fermions followed by cascade decays through a dark gauge sector. In the top-portal realisation (TPVDM), this structure leads to a distinctive six-top final state, which is essentially background-free and persists across almost the entire phenomenologically viable parameter space.
We present new reinterpretation results for this six-top signature using existing ATLAS and CMS Run-2 analyses targeting high jet multiplicities, multiple $b$-jets, and top-rich final states. A dedicated CLs-based combination of mutually orthogonal signal regions significantly improves sensitivity, extending current mass limits by up to $\mathcal{O}(100)$ GeV compared with any individual analysis. First projections for the High-Luminosity LHC indicate sensitivity to vector-like top partner masses in the $2.2-2.3$ TeV range.
The talk focuses on the collider phenomenology of the six-top signature in the top-portal scenario, while briefly outlining how other FPVDM realisations lead to different six-fermion final states, highlighting a concrete and largely unexplored opportunity for LHC reinterpretation.
Based on arXiv:2508.04912 and arXiv:2203.04681.
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