https://doi.org/10.1140/epjc/s10052-021-08875-6
Regular Article – Theoretical Physics
Study of quasi-two-body 
decays in perturbative QCD approach
1
Department of Physics, Yantai University, 264005, Yantai, China
2
Center for High Energy Physics, Peking University, 100871, Beijing, China
3
Department of Physics, Jiangsu Normal University, 221116, Xuzhou, China
Received:
22
November
2020
Accepted:
13
January
2021
Published online:
28
January
2021
In 2017, LHCb collaboration reported their first observation of the rare decays 
and the evidence of 
. Motivated by this, we study these quasi-two-body decays in the perturbative QCD approach. The branching fractions, CP asymmetries and the polarization fractions are calculated. We find that within the appropriate two-meson wave functions, the calculated branching fractions are in agreement with the measurements of LHCb. Based on the narrow-width approximation, We also calculate the branching fractions of the quasi-two-body 
and 
, and hope the predictions to be tested in the ongoing LHCb and Belle II experiments. Moreover, the processes 
are also analyzed under the approximation. We note that the CP asymmetries of these decays are very small, because these decays are either penguin dominant or pure penguin processes.
© The Author(s) 2021
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