https://doi.org/10.1140/epjc/s10052-023-12099-1
Regular Article - Theoretical Physics
Isospin violating decays of vector charmonia
1
School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, 310024, Hangzhou, China
2
Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China
3
Institute of Theoretical Physics, UCAS, University of Chinese Academy of Sciences, 100190, Beijing, China
c
zhangjiabao21@mails.ucas.ac.cn
Received:
23
August
2023
Accepted:
1
October
2023
Published online:
29
October
2023
We study the isospin violating decays of vector charmonia to 
and its charge conjugate. They are dominated by the single photon annihilation and can be evaluated reliably with timelike form factors. We utilize the quark-pair creation model, which is valid for the OZI suppressed decays, to evaluate the form factors. We obtain the branching fractions of 
and 
, which are compatible with the measurements by the BESIII collaborations, respectively. The decay asymmetries are found to be 
and 
, which can be examined at BESIII in the foreseeable future.
© The Author(s) 2023
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