https://doi.org/10.1140/epjc/s10052-020-7764-6
Regular Article - Theoretical Physics
Spectroscopy of 
mesons and the possibility of finding exotic -like structures
1
Grupo de Física Nuclear and Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, 37008, Salamanca, Spain
2
Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, 41013, Sevilla, Spain
* e-mail: pgortega@usal.es
Received:
28
January
2020
Accepted:
21
February
2020
Published online:
9
March
2020
The bottom-charmed (
) mesons are more stable than their charmonium (
) and bottomium (
) partners because they cannot annihilate into gluons. However, the low production cross-sections and signal-to-background ratios avoided until now their clear identification. The recent experimental results reported by CMS and LHCb at CERN open the possibility of having a spectrum as complete as the ones of charmonium and bottomonium. Motivated by this expectation, we compute bottom-charmed meson masses in the region energies in which decay meson–meson thresholds are opened, looking for the analogs to the X(3872) in the spectroscopy. We use a constituent quark model in which quark–antiquark degrees of freedom are complemented by four-body Fock states configurations. The model has been applied to a wide range of hadronic observables, in particular to the X(3872), and thus the model parameters are completely constrained. No extra states are found in the 
and 
sectors. However, in the 
sector we found an additional state very close to the 
threshold which could be experimentally detected.
© The Author(s), 2020
