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The mismatch is now as large as the measurement errors.","posed_since":"","precise":"Quantify the relation $m_t^{\\mathrm{MC}} = m_t^{\\mathrm{pole}} + \\Delta$ between the top mass parameter of parton-shower event generators and the pole (or MSR) mass, including the $\\operatorname{O}(\\Lambda_{\\mathrm{QCD}})$ renormalon ambiguity of the pole mass. An answer is Delta with uncertainty below $\\sim 0.3\\,\\mathrm{GeV}$ and a calibration usable by LHC analyses.","problem_ref":null,"references":"","settled_by":"First-principles calculations of parton-shower mass schemes calibrated against hadron-level NNLL plus NNLO predictions of top-mass-sensitive observables.","status_note":"Calibration studies (2018 to 2025) estimate $\\Delta$ of order $0.5\\,\\mathrm{GeV}$ with comparable uncertainty.","title":"How precisely does the measured top mass equal the pole 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