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The SM predicts 4.1 MeV, far too narrow to resolve directly at the LHC.","posed_since":"","precise":"Determine $\\Gamma_H$ with $\\le 5\\%$ uncertainty (SM: $4.1\\ \\mathrm{MeV}$). CMS used off-shell $H* \\to \\mathrm{ZZ}$ production to obtain $\\Gamma_H=3.2+2.4-1.7\\ \\mathrm{MeV}$ (Nature Physics 18, 1329, 2022), a method that assumes equal coupling modifiers on and off shell. An answer is a model-independent $\\Gamma_H$, which bounds the total rate of undetected and invisible decays.","problem_ref":"91a0432f85a90f3bdb38ba63ea10aaf93e6303e1b862d9350cd4b35e2ba0e7c0","references":"","settled_by":"A Higgs-factory measurement of $\\sigma(e+ e- \\to \\mathrm{ZH})$ by the recoil-mass method combined with $\\mathrm{BR}(H \\to \\mathrm{ZZ}*)$ or $\\mathrm{BR}(H \\to \\mathrm{WW}*)$, giving $\\Gamma_H$ without model assumptions at the percent level.","status_note":"The 2022 CMS off-shell result agrees with the SM within errors of about 60 percent.","title":"Is the Higgs total decay width equal to the SM 4.1 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