The discovery of the X(3872) meant the revival of the heavy meson spectroscopy beyond naive qqˉ structures. Once that the SU(3) scheme, which was very useful in the dawn of the quark models, does not work for these states, one has to use new symmetries, like Heavy Quark Spin Symmetry (HQSS) and Heavy Flavor Symmetry (HFS), to look for new states. However, at the energy regions where these new states appear, new factors are involved and it is not straightforward to relate the predictions of the symmetries with the data. In this work, we present a critical analysis of this problem and show, in a coupled-channels model, how the relative position of the bare QQˉ states with respect to meson-meson thresholds and the coupling with other channels modulate the strength of the interaction and, hence, modify the structure of the predicted states. We found a possible candidate to the X(3872) partner at 10599 MeV/c2.
@article{arxiv.2107.08451,
title = {Symmetries, partners and thresholds: the case of the $X_b$},
author = {Pablo G. Ortega and David R. Entem and Francisco Fernandez},
journal= {arXiv preprint arXiv:2107.08451},
year = {2021}
}