Orateur
Description
The Fermionic Portal Vector Dark Matter (FPVDM) framework generically predicts six-fermion final states arising from pair production of heavy vector-like fermions followed by dark-sector cascade decays. In the top-portal realisation (TPVDM), this structure leads to a distinctive and essentially background-free six-top final state, which persists across almost the entire parameter space compatible with gravitational-wave, relic-density, and direct-detection constraints.
I will present new reinterpretation results for this six-top signature using ATLAS and CMS Run-2 analyses targeting high jet multiplicities, multi-b final states, and top-rich topologies. A dedicated CLs-based combination of mutually orthogonal signal regions extends current limits by up to O(100 GeV) compared with any single analysis. First HL-LHC projections reach the 2.2-2.3 TeV mass range for the vector-like fermions.
The talk will focus on the six-top realisation of the top portal, while briefly outlining prospects for other FPVDM realisations that generate different six-fermion signatures. This identifies a concrete, underexplored opportunity for LHC reinterpretation.
Based on: https://arxiv.org/abs/2508.04912 , https://arxiv.org/abs/2204.03510 , https://arxiv.org/abs/2203.04681
