https://doi.org/10.1140/epjc/s10052-019-7055-2
Regular Article - Theoretical Physics
Quasi-two-body decays 
in the perturbative QCD approach
1
Department of Mathematics and Physics, Nanjing Institute of Technology, Nanjing, 211167, Jiangsu, People’s Republic of China
2
Institute of Theoretical Physics, Shanxi University, Taiyuan, 030006, Shanxi, People’s Republic of China
3
Department of Physics, College of Science, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People’s Republic of China
4
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210023, Jiangsu, People’s Republic of China
* e-mail: theoma@163.com
Received:
30
January
2019
Accepted:
17
June
2019
Published online:
24
June
2019
We study the quasi-two-body decays 
by employing the perturbative QCD approach. The two-meson distribution amplitudes 
are adopted to describe the final state interactions of the kaon–pion pair in the resonance region. The resonance line shape for the P-wave 
component 
in the time-like form factor 
is parameterized by the relativistic Breit-Wigner function. For most considered decay modes, the theoretical predictions for their branching ratios are consistent with currently available experimental measurements within errors. We also disscuss some ratios of the branching fractions of the concerned decay processes. More precise data from LHCb and Belle-II are expected to test our predictions.
© The Author(s), 2019
