Collider searches for scalar singlets across lifetimes
Elina Fuchs, Oleksii Matsedonskyi, Inbar Savoray, Matthias Schlaffer
Abstract
A bstract 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.
Topics & Concepts
PhysicsParticle physicsScalar (mathematics)Higgs bosonLeptonParameter spaceColliderStandard Model (mathematical formulation)Large Hadron ColliderPhysics beyond the Standard ModelCoupling (piping)Singlet stateHadronTheoretical physicsScalar bosonCover (algebra)Range (aeronautics)Extra dimensionsTop quarkParticle decayElectron–positron annihilationElementary particleNuclear physicsSpace (punctuation)Matching (statistics)Particle physics theoretical and experimental studiesComputational Physics and Python ApplicationsQuantum Chromodynamics and Particle Interactions