{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"70af7c0fa2e6c563d7efa76f9fac93753b5c40211adfeb818a0437f7eda628a0","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["1841b34bac8179ec01d8796a5d522e941728ce0f980f2446b08e6bb19d0bfbc1","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"1d0b24a8abd10bda56338f51c9ed3bdc2067d2ea648f043ea400d599e9d57988","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":"2","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 $\\sqrt{2}\\,m_e/v \\sim 2.9 \\times 10^{-6}$), or $\\kappa_e = y_e/y_e^{\\mathrm{SM}}$. The best direct bound, CMS $\\operatorname{BR}(H \\to e+ e-) < 3.0 \\times 10^{-4}$ at 95 percent CL (Phys. Lett. B 846, 137783, 2023), corresponds to $\\left|\\kappa_e\\right| < \\sim 240$ (approximate, using $\\operatorname{BR}_{\\mathrm{SM}} \\sim 5 \\times 10^{-9}$). An answer is $\\kappa_e$ measured with $O(1)$ precision, enough to separate $\\kappa_e = 1$ from $\\kappa_e = 0$.","problem_ref":"1841b34bac8179ec01d8796a5d522e941728ce0f980f2446b08e6bb19d0bfbc1","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 mass?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b330d46aa208685b99b3d7e701db7b531403181683bceea415c7042960dc4390","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"950fa7ca6d762eeac9b079ef37ccdf5c68994010d08e3f9e9ce3dab3423439b0","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"C8uyFIs7tbouTcqfVqWwVVQTp-XgifkrVSBKobwFfbFXWCP5GMkm2aikPep-C-Aw2I8PsvKvzhGiSrC4Oi5SDw"},"schema":"pubphys.envelope/1"},"record_hash":"b330d46aa208685b99b3d7e701db7b531403181683bceea415c7042960dc4390","leaf_index":3356}