https://doi.org/10.1140/epjc/s10052-019-7568-8
Regular Article - Theoretical Physics
and 
excited states within a 
HQSS model
1
Instituto de Física Corpuscular (centro mixto CSIC-UV), Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain
2
Institut für Theoretische Physik, University of Frankfurt, Max-von-Laue-Str. 1, 60438, Frankfurt am Main, Germany
3
Frankfurt Institute for Advanced Studies, University of Frankfurt, Ruth-Moufang-Str. 1, 60438, Frankfurt am Main, Germany
4
Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, 08193, Barcelona, Spain
5
Institut d’ Estudis Espacials de Catalunya (IEEC), 08034, Barcelona, Spain
* e-mail: tolos@ice.csic.es
Received:
14
November
2019
Accepted:
14
December
2019
Published online:
11
January
2020
We study odd parity 
and 
resonances using a unitarized coupled-channel framework based on a HQSS-extended Weinberg–Tomozawa baryon–meson interaction, while paying a special attention to the renormalization procedure. We predict a large molecular 
component for the 
with a dominant 
light-degree-of-freedom spin configuration. We discuss the differences between the 
and 
states, and conclude that they cannot be SU(3) siblings, whereas we predict the existence of other -states, one of them related to the two-pole structure of the 
. It is of particular interest a pair of and poles, which form a HQSS doublet and that we tentatively assign to the 
and 
, respectively. Within this picture, the would be part of a SU(3) sextet, containing either the 
or the 
, and that would be completed by the 
. Moreover, we identify a sextet with the 
state and the recently discovered 
. Assuming the equal spacing rule and to complete this multiplet, we predict the existence of a
odd parity state, with a mass of 6360 MeV and that should be seen in the 
channel.
© The Author(s), 2020
