X(2239) and
as hidden-strange molecular states from
interaction Supported by the National Natural Science Foundation of China (11675228, 11775050, 61871124), the Fundamental Research Funds for the Central Universities, the national defense Pre-Research foundation of China, by State Key Laboratory of Acoustics, Chinese Academy of Sciences (SKLA201604), Science and Technology on Sonar Laboratory, the Stable Supporting Fund of Acoustic Science and Technology Laboratory
Jun-Tao Zhu (
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210097, China); Yi Liu (
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210097, China); Dian-Yong Chen (
School of Physics, Southeast University, Nanjing 210094, China); Longyu Jiang (
The Laboratory of Image Science and Technology, Southeast University, Nanjing 210096, China); Jun He (
Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210097, China)
In this work, we propose the possible assignment of the newly observed
, as well as
, as a molecular state from the interaction of a baryon
and an antibaryon
. With the help of effective Lagrangians, the
interaction is described within the one-boson-exchange model with
,
,
,
, and
exchanges considered. After inserting the potential kernel into the quasipotential Bethe-Salpeter equation, the bound states from the
interaction can be studied by searching for the pole of the scattering amplitude. Two loosely bound states with spin parities
and
appear near the threshold with almost the same parameter. The
state can be assigned to
observed at BESIII, which is very close to the
threshold. The scalar meson
can be interpreted as a
state from the
interaction. The annihilation effect is also discussed through a coupled-channel calculation plus a phenomenological optical potential. It provides large widths to two bound states produced from the
interaction. The mass of the
state is slightly larger than the mass of the
state after including the annihilation effect, which is consistent with our assignment of these two states as
and
, respectively. The results suggest that further investigation is required to understand the structures near the
threshold, such as
,
, and
.
