{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"987e1d082aea8079ce37b30d533885c3623292a840a1f6700ac32c415c08885a","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","92f81305b482b6400d3856a69e01288ef6a9ddb630b25dfa8b749462fb37756b"],"salt":"3bd43e39075b8aa2d4ee129c48f9caf638b6f70f0616c7c3b4799ce813cf526a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"nuc.exotic-hadrons.tcc-pole-lattice","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"92f81305b482b6400d3856a69e01288ef6a9ddb630b25dfa8b749462fb37756b","relation":"special_case"}],"plain":"The $T_{cc}+$, found in 2021, contains two charm quarks and two light antiquarks and lies just below the energy of a $D*+$ and D0 meson pair. Lattice QCD (QCD computed numerically on a space-time grid) calculations near the real quark masses disagree on whether it is a true bound state or a virtual state (a near-bound state that does not quite bind).","posed_since":"2021","precise":"Compute $D D*$ scattering in the $I = 0, J^{P} = 1+$ channel in lattice QCD at physical pion mass, including the left-hand cut from one-pion exchange, with continuum extrapolation, and determine whether T_cc+ is a bound state, virtual state or resonance. Experiment: about 0.36 MeV below the $D*+ D0$ threshold, width about 48 keV. Answer: pole position with uncertainty below 0.2 MeV.","problem_ref":null,"references":"","settled_by":"A lattice QCD calculation at the physical point with a finite-volume formalism that handles the one-pion-exchange left-hand cut, extrapolated to the continuum.","status_note":"Padmanath and Prelovsek (2022, $m_{\\pi}$ about $280\\,\\mathrm{MeV}$) found a virtual state; HAL QCD (Lyu et al., PRL 2023, $m_{\\pi} = 146\\,\\mathrm{MeV}$, potential method) found a near-threshold virtual state at $E = -59 (+53/-99)\\,\\mathrm{keV}$; a finite-volume treatment with the one-pion-exchange left-hand cut at the physical point was still lacking as of 2026.","title":"Pole of the doubly charmed $T_{cc}+$ from lattice 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