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Sifting composite from elementary models at FCCee and CePC

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arxiv 2211.00961 v1 pith:3EJ6JBUY submitted 2022-11-02 hep-ph

classification hep-ph
keywords colliderscompositeelementaryphysicscasediscoveryfuturemodels
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

New Physics models with either an elementary or composite origin are often associated with a similar imprint in a direct search at colliders, case in point being the production of a light pseudoscalar in association with a monochromatic photon from the decay of a Z boson at future $e+e-$ colliders. We exploit the correlation between the discovery of a signal in the Z decays and electroweak precision measurements as a tool to distinguish a composite model from an elementary scalar one. Our results offer an appealing and rich physics case for future colliders and demonstrate how a lepton collider at the Z mass can be a discovery machine for new physics in the Higgs sector.

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  1. Impact of Higgs precision measurements at the LHC and FCC-ee on the spectrum of composite Higgs models

    hep-ph 2026-08 conditional novelty 4.0 of 10

    Using κ_V = cosθ and m_η = m_h/sinθ, Higgs precision data imply singlet mass bounds of about 440 GeV (Run-2), 600 GeV (HL-LHC), and 2 TeV (FCC-ee).

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