Symmetries, Partners and Thresholds: The Case of the Xb

The discovery of the X(3872) meant the revival of the heavy meson spectroscopy beyond naive q (q) over bar over bar structures. Since 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 Q (Q) over bar over bar 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 10,599 MeV/c(2).

Automated summary

The discovery of the X(3872) led to a revival in heavy meson spectroscopy beyond traditional structures, requiring the use of new symmetries to seek out new states. However, predicting these states is complicated by the involvement of new factors at the energy regions where they appear, making it challenging to relate symmetry predictions with data.