Regular Article - Theoretical Physics
Strong decays of the as a and molecule
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
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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