Abstract
In this work, we study the hidden-strange molecular states composed of a baryon and a vector meson in a coupled-channel interaction. With the help of the effective Lagrangians which coupling constants are determined by the SU(3) symmetry, the interaction is constructed and inserted into the quasipotential Bethe-Salpeter equation to search for poles in the complex plane, which correspond to molecular states. Two poles are found with a spin parity near the and the thresholds, which can be related to the and the , respectively. No pole near the threshold can be found if direct interaction between a nucleon and meson is neglected according to the OZI rule. After introducing the QCD van der Waals force between a nucleon and meson, a narrow state can be produced near the threshold. Inclusion of the QCD van der Waals force changes the line shape of the invariant mass spectrum in the channel leading to a worse agreement with the present low-precision data. Future experiments at BelleII, JLab, and other facilities will be very helpful to clarify the existence of these possible hidden-strange molecular states.
- Received 2 May 2018
- Revised 15 October 2018
DOI:https://doi.org/10.1103/PhysRevD.98.094019
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society