{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a7dd7824f4eda536300924b62e1db060b4eb391e9e75c35a371b8b74718541f0","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","bb9ca2e2ee12d930d868121bebc8940dd59ec3d6c3bc44b9dfa4364bbd9a7a7b"],"salt":"45bd767087cd9df0a460bde59ecb8e43ed3c0b3b86465532edf85ca3d89937a1","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"hep.hierarchy-problem.higgs-compositeness","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"bb9ca2e2ee12d930d868121bebc8940dd59ec3d6c3bc44b9dfa4364bbd9a7a7b","relation":"special_case"}],"plain":"The Higgs could be a point-like particle or a bound state of new strongly interacting constituents, much as a pion is made of quarks. A composite Higgs would show small deviations in how it couples to other particles.","posed_since":"","precise":"In composite pseudo-Goldstone Higgs models, Higgs couplings to W, Z and fermions deviate from SM values by $\\mid \\kappa - 1 \\mid \\sim \\xi = v^{2}/f^{2}$ up to $O(1)$ factors, with f the compositeness scale. Determine whether $\\xi > 0$ by measuring $\\kappa_V$ and $\\kappa_f$ to 0.1 to 1 percent, or find the associated resonances of mass $m_\\rho \\sim g_\\rho f$ with $1 < g_\\rho < 4\\pi$.","problem_ref":null,"references":"","settled_by":"Higgs coupling measurements at a Higgs factory (FCC-ee, CEPC or a linear collider) at the per-mille level for $\\kappa_Z$, combined with high-energy searches for resonances.","status_note":"LHC coupling fits (2024 to 2025) agree with the SM at about the 5 to 10 percent level, implying $\\xi < \\sim 0.1$ and $f > \\sim 0.8\\,\\mathrm{TeV}$.","title":"Is the Higgs boson elementary or a composite bound 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