https://doi.org/10.1140/epjc/s10052-020-8421-9
Regular Article - Theoretical Physics
Strong decays of the 
as a 
and 
molecule
1
School of Physical Science and Technology, Southwest Jiaotong University, 610031, Chengdu, China
2
School of Physics, Beihang University, 102206, Beijing, China
3
Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, 102206, Beijing, China
4
Beijing Advanced Innovation Center for Big Data-based Precision Medicine, Beihang University, 100191, Beijing, China
5
School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, Henan, China
Received:
11
June
2020
Accepted:
31
August
2020
Published online:
9
September
2020
In this work, we study the strong decays of the newly observed assuming that it is a meson-baryon molecular state of and . We consider four possible spin-parity assignments 
and 
for the , and evaluate its partial decay width into 
and 
via hadronic loops with the help of effective Lagrangians. In comparison with the Belle data, the calculated decay width favors the spin-party assignment 
while the other spin-parity assignments do not yield a decay width consistent with data in the molecule picture. We find that about 52–68% of the total width comes from the 
channel, while the rest is provided by the 
channel. As a result, both channels are important in explaining the strong decay of the . In addition, the transition 
is the main decay channel in the 
case, which almost saturates the total width. These information are helpful to further understand the nature of the .
© The Author(s) 2020
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