https://doi.org/10.1140/epjc/s10052-023-12012-w
Regular Article - Theoretical Physics
Hidden charmonium decays of 
through charmed meson loops
1
College of Physics and Engineering, Qufu Normal University, 273165, Qufu, China
2
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China
Received:
17
July
2023
Accepted:
5
September
2023
Published online:
13
September
2023
We calculated transitions of the higher radial excited charmonia 
to the orbital excited charmonium 
with emission of one pion or eta meson. In calculations, the intermediate S- and P-wave charmed meson loops were considered in terms of the nonrelativistic effective field theory. The results indicate that the transitions of interest are dominated by the loops involving the 
charmed mesons, whereas the 
charmed meson loops are of minor contributions. The partial decay widths of 
are of the order of 0.01–1 keV. For the case of 
, the partial decay widths are from 0.1 to 100 keV, implying the branching ratios from 
to 
. Moreover, the partial decay widths for are found to decrease as the 
-
mixing angle increases. It is hoped that the present calculated results would be observed in the future experiments.
© The Author(s) 2023
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