Dark Higgs-strahlung, with or without an initial-state photon, gives a displaced-vertex plus missing-energy signature that could make Belle II more sensitive to dark photon models than single-photon searches alone.
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Dark Higgs-strahlung at Belle II: A distinctive dark sector signature with displaced vertices and missing energy
Dark Higgs-strahlung, with or without an initial-state photon, gives a displaced-vertex plus missing-energy signature that could make Belle II more sensitive to dark photon models than single-photon searches alone.