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Isospin breaking of the narrow charmonium state of Belle at 3872 MeV as a deuson

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arxiv hep-ph/0402237 v2 pith:AVT34EPD submitted 2004-02-23 hep-ph nucl-th

Nils A. Tornqvist This is my paper · ORCID
classification hep-phnucl-th
keywords isospinstatebreakingbecausebellecharmoniumdeusonlarge
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The narrow charmonium state near 3872 MeV reported by the Belle collaboration and confirmedby CDF lies almost exactly at the neutral D anti-D* threshold. As was predicted many years ago it can be a deuteronlike meson-meson state called a deuson. If so, it should be an axial, or possibily a pseudoscalar state with C=0, and isospin predominantly 0. Large isospin breaking is expected because of the isospin mass splitting between the neutral and charged D (D*) mesons. Because of this large isospin breaking the decay X(3872) to J/psi rho would be allowed, while J/psi sigma would be forbidden by C-parity, as indicated by the present data.

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Cited by 12 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Observation of the decay $\chi_{c1}(3872)\rightarrow J\mskip -3mu/\mskip -2mu\psi \mu^+\mu^-$

    hep-ex 2026-01 accept novelty 7.0 of 10

    First observation of χ_c1(3872) → J/ψ μ⁺μ⁻ reported at 6.5σ significance with branching fraction ratio (1.68 ± 0.37) × 10^{-3} relative to the π⁺π⁻ mode.

  2. A tale of Bethe logarithms: leptonic widths of $\chi_{cJ}$ and Lamb shift

    hep-ph 2024-11 conditional novelty 7.0 of 10

    The infrared divergence in chi_cJ to e+e- decays is canceled by adding the next-to-leading Fock component, yielding finite, scale-independent leptonic width predictions expressed through Bethe logarithms.

  3. Heavy meson chiral perturbation theory constraints on a charm-coupled GeV-scale QCD axion

    hep-ph 2026-07 conditional novelty 6.0 of 10

    A charm-only QCD axion model passes a heavy-meson EFT consistency check, with its tightest bound coming from σ-mediated B_s mixing.

  4. Hadroproduction data support tetraquark hypothesis for $\chi_{c1} (3872)$

    hep-ph 2025-05 conditional novelty 6.0 of 10

    A parameter-free formalism, based on one color-octet channel, reproduces LHC hadroproduction rates of χc1(3872) and supports its tetraquark interpretation.

  5. $KX(3872)$ interaction and correlation function

    hep-ph 2026-07 conditional novelty 5.0 of 10

    A unitarized fixed-center approximation predicts a narrow KX(3872) bound state 50 MeV below threshold and a characteristic femtoscopic correlation function.

  6. Short-range production of three bottom mesons

    hep-ph 2025-11 unverdicted novelty 5.0 of 10

    Leading-order predictions for three-body point production rates of B and B* meson systems are derived in short-range NREFT from two-body input alone.

  7. Hidden-Charm Tetraquarks in a Mixture Model: Coupled-Channel Analysis with $c\bar{c}$ and Hadronic Molecular Components

    hep-ph 2025-05 conditional novelty 5.0 of 10

    A coupled-channel mixture model fitted to the X(3872) and Z(3930) masses predicts the X(3860) at about 3867 MeV, dominated by the charmonium core.

  8. Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners

    hep-ph 2019-08 conditional novelty 5.0 of 10

    X(3872) is best described as a shallow D D* molecule in which one-pion exchange and a small charmonium core provide comparable attraction.

  9. Radiative decays of $X(3872)$ within $D{\bar D}^*$ molecular framework

    hep-ph 2026-07 conditional novelty 4.0 of 10

    Using nonrelativistic effective field theory, the X(3872) is treated as a D*D molecule to predict radiative decay widths to D D gamma, finding a strong neutral-over-charged hierarchy and quantifying D D rescattering effects.

  10. $X(3872)$ and hidden charmed tetraquarks

    hep-ph 2025-06 conditional novelty 4.0 of 10

    A diquark-antidiquark quark model with parameters fitted to X(3872) and Tcc predicts hidden-charm tetraquark masses and tentatively assigns XYZ states.

  11. Unquenched Charmonium and Beyond

    hep-ph 2026-02 conditional novelty 2.0 of 10

    This Lanzhou-group review argues that coupled-channel (unquenched) effects, not exotic constituents, are the common thread explaining charmonium anomalies from the rho-pi puzzle to the Y-problem states.

  12. Production of exotic hadrons in $pp$ and nuclear collisions

    hep-ph 2024-11 conditional novelty 1.0 of 10

    A review of exotic-hadron production in pp, pbar-p, and nuclear collisions, arguing that such measurements can discriminate between hadronic-molecule and compact-tetraquark interpretations of states like the X(3872).

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