Abstract
Spin-0 singlets arise in well-motivated extensions of the Standard Model. Their lifetime determines the best search strategies at hadron and lepton colliders. To cover a large range of singlet decay lengths, we investigate bounds from Higgs decays into a pair of singlets, considering signatures of invisible decays, displaced and delayed jets, and coupling fits of untagged decays. We examine the generic scalar singlet and the relaxion, and derive a matching as well as qualitative differences between them. For each model, we discuss its natural parameter space and the searches probing it.
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Fuchs, E., Matsedonskyi, O., Savoray, I. et al. Collider searches for scalar singlets across lifetimes. J. High Energ. Phys. 2021, 19 (2021). https://doi.org/10.1007/JHEP04(2021)019
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DOI: https://doi.org/10.1007/JHEP04(2021)019