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Radiative Transitions in Charmonium from Lattice QCD

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arxiv 2301.08213 v2 pith:IORRSBMW submitted 2023-01-19 hep-lat hep-ph

James Delaney , Christopher E. Thomas , Sinéad M. Ryan This is my paper
classification hep-lathep-ph
keywords latticefactorsformamplitudescharmoniumdynamicalinvolvingmesons
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The coupling of various charmonium mesons to a photon is studied using lattice QCD, giving access to radiative form factors and transitions, and probing the mesons' structure. Methods are developed which allow the robust determination of amplitudes, including those involving an excited state as well as multiple form factors, for a range of kinematics. These are applied in dynamical lattice QCD calculations using the distillation technique to compute the underlying three-point correlation functions. Form factors and amplitudes involving the low-lying charmonia, $\eta_c$, $J/\psi$, $\chi_{c0}$ and $\eta_c'$, are calculated, demonstrating the methods and providing the first dynamical lattice QCD results for some quantities.

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Cited by 5 Pith papers

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

  1. Electromagnetic form factors and structure of the $T_{bb}$ tetraquark from lattice QCD

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    Lattice QCD on one ensemble yields electromagnetic form factors for T_bb, indicating a compact heavy diquark plus light antidiquark bound state with charge radius smaller than the BB* threshold.

  2. Radiative decays $J/\psi,\,\psi(2S)\rightarrow\gamma\eta^{(\prime)}$ in perturbative QCD with relativistic corrections

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Order-q² relativistic corrections in pQCD roughly double J/ψ→γη(') rates and favor a smaller mixing angle, while ψ(2S) rates overshoot data and may require coherent ηc mixing.

  3. Extraction of charmonium branching fractions from $J/\psi\to\gamma\eta_c$ radiative decays

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    Proposes new photon line shape and branching fraction extraction method for J/psi to gamma eta_c, claiming compatibility between PDG data correlations and lattice QCD widths via profile scan.

  4. A Unified Study of Hidden-Charm and Hidden-Bottom Mesons

    hep-ph 2026-07 conditional novelty 4.0 of 10

    A common screened-potential and QCD sum-rule framework yields consistent spectra, E1/M1 widths, Regge slopes, decay constants and finite-spectrum thermal indicators for c¯c and b¯b mesons.

  5. Mechanical distribution of the pseudoscalar charmonium and bottomonium on the light-front

    hep-ph 2026-06 unverdicted novelty 4.0 of 10

    Light-front quark model calculations with two Gaussian wave functions yield transverse mechanical distributions for pseudoscalar charmonium and bottomonium, showing a nodal pressure and positive force.

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