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Revisiting radiative transitions of charmonium states in a covariant confined quark model

Aidos Issadykov1,2, Mikhail A. Ivanov1, Dang-Khoa N. Nguyen3, Chien-Thang Tran3,*, Akmaral Tyulemissova1,2, and Zhomart Tyulemissov1,2,4

  • *Contact author: thangtc@hcmute.edu.vn
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Phys. Rev. D 112, 094041 – Published 20 November, 2025

DOI: https://doi.org/10.1103/g1sg-zvyx

Abstract

We calculate the amplitudes and branching fractions of χcJ(1P), hc(1P), J/ψ(1S), and ψ(2S) radiative decays in the framework of the covariant confined quark model. First, we explicitly show that all calculated amplitudes are gauge invariant. Next, we use experimental data for three decay channels J/ψ→ηcγ, χc0→J/ψγ, and ψ(2S)→χc0γ to fit the model parameters including the charm quark mass and the meson size parameter. Finally, we use the obtained parameters to predict the branching fractions of the decays hc→ηcγ, χc1(c2)→J/ψγ, and ψ(2S)→χc1(c2)γ. Our predictions agree well with experimental data.

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Phys. Rev. D 112, 094041– Published 20 November, 2025
  • Received 18 September 2025
  • Accepted 5 November 2025
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