{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"0e923a138d212b26ba025e468ad4c80db8b698dd67a808d2e7fbd0a7d95341f0","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"cd0c84793bec1e074a5cda30d5ddbe1916f3671800242f6970753c32b0713feb","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"hep.higgs-couplings.top-yukawa-cp","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"The SM predicts that the interaction between the Higgs and the top quark respects CP, the combined mirror and particle-antiparticle symmetry. A CP-violating part would be a new source of the matter-antimatter difference.","posed_since":"","precise":"With L ~ -(y_t/sqrt 2) kappa_t h tbar (cos alpha + i gamma_5 sin alpha) t, the SM has $\\alpha = 0$. ATLAS ttH and tH with $H \\to \\gamma \\gamma$ excludes $\\mid\\alpha\\mid > 43\\ \\mathrm{deg}$ at 95 percent CL (Phys. Rev. Lett. 125, 061802, 2020). An answer is alpha determined to a few degrees, or a bound which, combined with electron EDM limits, decides whether top-Higgs CP violation can supply electroweak baryogenesis.","problem_ref":null,"references":"","settled_by":"HL-LHC angular analyses of ttH and tH production in several Higgs decay channels, combined with EDM limits on the loop-induced CP-odd operators.","status_note":"LHC Run 2 data agree with $\\alpha = 0$ and exclude a purely CP-odd top Yukawa coupling.","title":"Does the top-Higgs coupling contain a CP-violating 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