Symmetries, Partners and Thresholds: The Case of the Xb

Symmetry

卷:13

Pablo G. Ortega¹  David R. Entem²  Francisco Fernández³ 

[1] Department Fundamental Physics and IUFFyM, Universidad de Salamanca, E-37008 Salamanca, Spain;

[2] Grupo de Física Nuclear and IUFFyM, Universidad de Salamanca, E-37008 Salamanca, Spain;

[3] IUFFyM, Universidad de Salamanca, E-37008 Salamanca, Spain;

关键词: potential models;    bottom mesons;    exotic mesons;   

DOI  :  10.3390/sym13091600

来源: DOAJ

【 摘 要 】

The discovery of the $X\left(3872\right)$ meant the revival of the heavy meson spectroscopy beyond naive $q\overline{q}$ structures. Since the $SU\left(3\right)$ 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 $Q\overline{Q}$ 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 $X\left(3872\right)$ partner at 10,599 MeV$/c^2$.

【 授权许可】

Unknown