https://doi.org/10.1140/epjc/s10052-021-08857-8
Regular Article – Theoretical Physics
Branching fractions of 
and their implications
1
School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, China
2
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, 210023, Nanjing, Jiangsu, China
3
Department of Physics, Hunan Normal University, 410081, Changsha, China
Received:
22
September
2020
Accepted:
8
January
2021
Published online:
22
January
2021
The exotic states 
with the quark flavor of 
are recently observed in the mass spectrum of 
in 
by the LHCb collaboration. To explore the nature of , except for analyzing their masses and decay widths as usually did in literatures, the study of their production mechanism in B-meson weak decays would provide another important information. The amplitude of 
is non-factorizable. We consider the final-state-interaction effects and calculate them via the rescattering mechanism. The measured branching fractions of are revealed. It is manifested by 
and 
that the rescattering mechanism can result in the relatively large branching fractions. The similar processes of 
are also analyzed. The isospins of 
can be investigated by 
decays.
© The Author(s) 2021
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Funded by SCOAP3
