https://doi.org/10.1140/epjc/s10052-017-5016-1
Regular Article - Theoretical Physics
Chiral dynamics, S-wave contributions and angular analysis in 
INPAC, Shanghai Key Laboratory for Particle Physics and Cosmology, Department of Physics and Astronomy, Shanghai Jiao-Tong University, Shanghai, 200240, China
* e-mail: shuai.zhao@sjtu.edu.cn
Received:
2
February
2017
Accepted:
23
June
2017
Published online:
7
July
2017
We present a theoretical analysis of the 
and 
decays. We construct a general angular distribution which can include arbitrary partial waves of 
. Retaining the S-wave and P-wave contributions we study the branching ratios, forward–backward asymmetries and a few other observables. The P-wave contribution is dominated by 
resonance, and the S-wave contribution is analyzed using the unitarized chiral perturbation theory. The obtained branching fraction for 
, at the order 
, is consistent with the available experimental data. The S-wave contribution has a branching ratio at the order of 
, and this prediction can be tested by experiments like BESIII and LHCb. Future measurements can also be used to examine the 
– scattering phase shift.
© The Author(s), 2017
