https://doi.org/10.1140/epjc/s10052-021-09303-5
Regular Article - Theoretical Physics
The hadronic 
decay 
and the axial vector mixing angle
1
Niigata University, 8050 Ikarashi 2-no-cho, Nishi-ku, 950-2181, Niigata, Japan
2
Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405, Orsay, France
Received:
7
April
2021
Accepted:
30
May
2021
Published online:
7
June
2021
We propose to measure the 
decay in order to determine the 
axial vector mixing angle 
. We derive, for the first time, the differential decay rate formula for this decay mode. Using the obtained result, we perform a sensitivity study for the Belle (II) experiment. We will show that the 
spectrum of the decay can discriminate the two solutions 
or 
observed in the other measurements.
© The Author(s) 2021
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