https://doi.org/10.1140/epja/s10050-025-01717-z
Regular Article - Theoretical Physics
The role of the 
and 
resonances in the 
, 
decays
1
Department of Physics, Guangxi Normal University, 541004, Guilin, China
2
Graduate School of Maritime Sciences, Kobe University, 658-0022, Kobe, Japan
3
Guangxi Key Laboratory of Nuclear Physics and Technology, 541004, Guilin, China
4
Departamento de Física Teórica and IFIC, Centro Mixto, Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Apartado 22085, 46071, Valencia, Spain
Received:
11
April
2025
Accepted:
5
October
2025
Published online:
8
November
2025
We study the , decays which proceed in a direct mode via internal emission with equal rates. Yet, the experimental branching ratio for the 
mode is twice as big as that for the mode. We find a natural explanation based on the extra indirect mechanism where 
is produced via external emission and that channel undergoes final state interaction with other vector–vector channels to lead to the , final states, with transition amplitudes dominated by the resonance, recently discovered, and respectively. The large coupling of the to the channel is mostly responsible for this large ratio of the production rates.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
