{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a1ba38be296c69af96a592255bb56005c311f7f4a36a7ee41873e4f391aee1cd","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"90b3cc0b60713696e689cdadacd1177c39c797fbfef79aeb95fd89429a44d1c9","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"hep.higgs-couplings.electron-yukawa","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"The electron couples to the Higgs so weakly (strength about 3 in a million) that the coupling has never been detected. Measuring it would show whether the Higgs field is the source of the mass of the particle that sets the size of atoms.","posed_since":"","precise":"Measure the electron Yukawa coupling $y_e$ (SM value $\\sqrt{2}\\,m_e/v \\sim 2.9e-6$), or $\\kappa_e = y_e/y_e^{\\mathrm{SM}}$. The best direct bound, CMS $\\operatorname{BR}(H \\to e+ e-) < 3.0e-4$ at 95 percent CL (Phys. Lett. B 846, 137783, 2023), corresponds to $\\left|\\kappa_e\\right| < \\sim 240$ (approximate, using $\\operatorname{BR}_{\\mathrm{SM}} \\sim 5e-9$). An answer is $\\kappa_e$ measured with $O(1)$ precision, enough to separate $\\kappa_e = 1$ from $\\kappa_e = 0$.","problem_ref":null,"references":"","settled_by":"Resonant s-channel production $e+ e- \\to H$ at $\\sqrt{s}=m_{H}$ with a center-of-mass energy spread of about 4 MeV at FCC-ee, projected to reach $1.3\\,\\sigma$ for the SM coupling (an upper limit of 1.6 times $y_{e}^{\\mathrm{SM}}$) per interaction point per year with $10\\,\\mathrm{ab}^{-1}$ (d'Enterria, Poldaru, Wojcik, Eur. Phys. J. Plus 137, 201, 2022, arXiv:2107.02686).","status_note":"Only upper bounds exist as of 2026; FCC-ee feasibility studies reach sensitivity near the SM value.","title":"Does the Higgs field give the electron its 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