Revisiting radiative transitions of charmonium states in a covariant confined quark model
Issadykov A. Ivanov M.A. Nguyen D.-K.N. Tran C.-T. Tyulemissova A. Tyulemissov Z.
20 November 2025American Physical Society
Physical Review D
2025#112Issue 9
We calculate the amplitudes and branching fractions of χcJð1PÞ, hcð1PÞ, J=ψð1SÞ, and ψð2SÞ 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 ψð2SÞ → 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, χc1ðc2Þ → J=ψγ, and ψð2SÞ → χc1ðc2Þγ. Our predictions agree well with experimental data.
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Bogoliubov Laboratory of Theoretical Physics, JINR, Joliot-Curie 6, Dubna, 141980, Russian Federation
The Institute of Nuclear Physics, Agency of the Republic of Kazakhstan for Atomic Energy, Almaty, 050032, Kazakhstan
Department of Physics, Ho Chi Minh City University of Technology and Education, Vo Van Ngan 1, Ho Chi Minh City, 700000, Viet Nam
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Bogoliubov Laboratory of Theoretical Physics
The Institute of Nuclear Physics
Department of Physics
Al-Farabi Kazakh National University
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