Regular Article - Theoretical Physics
Description of the and states as molecular states
College of Nuclear Science and Technology, Beijing Normal University, Beijing, 100875, China
2 Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain
Accepted: 8 February 2019
Published online: 25 February 2019
In this work we study several and states dynamically generated from the meson–baryon interaction in coupled channels, using an extension of the local hidden gauge approach in the Bethe–Salpeter equation. These molecular states appear as poles of the scattering amplitudes, and several of them can be identified with the experimentally observed states, including the , , , and . Also, for the recently reported state, we find two poles with masses and widths remarkably close to the experimental data, for both the and sectors.
© The Author(s), 2019