https://doi.org/10.1140/epja/i2016-16359-7
Regular Article - Theoretical Physics
Hadronic molecular states from the
interaction
1
Theoretical Physics Division, Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
2
Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS and Lanzhou University, 730000, Lanzhou, China
* e-mail: junhe@impcas.ac.cn
Received:
20
July
2016
Accepted:
24
November
2016
Published online:
12
December
2016
In this work, the interaction is studied in a quasipotential Bethe-Salpeter equation approach combined with the one-boson-exchange model. With the help of the hidden-gauge Lagrangian, the exchanges of pseudoscalar mesons (
and
) and vector mesons (
,
and
) are considered to describe the
interaction. Besides the direct vector-meson exchange which can be related to the Weinberg-Tomozawa term, pseudoscalar-meson exchanges also play important roles in the mechanism of the
interaction. The poles of scattering amplitude are searched to find the molecular states produced from the
interaction. In the case of quantum number
, a pole is found with a reasonable cutoff, which can be related to the
in experiment. Another bound state with
is also produced from the
interaction, which can be related to the
. In the isovector sector, the interaction is much weaker and a bound state with
relevant to the
is produced but at a larger cutoff. Our results suggest that in the hadronic molecular state picture the
and
are the strange partners of the X(3872) and
, respectively.
© SIF, Springer-Verlag Berlin Heidelberg, 2016