Hidden-flavour four-quark states in the charm and bottom region

Abstract

We discuss the spectrum and the internal composition of ground and excited four-quark states in the charm and bottom energy region. To this end we extend previous calculations within the framework of the relativistic four-body Faddeev-Yakubovsky equation to include quantum numbers with $J^{PC}=0^{++},0^{-+},1^{--},1^{+-}$ and $1^{++}$ and study their internal composition in terms of heavy-light meson pairs, hadroquarkonia and diquark-antidiquark clusters. We observe similar patterns in the charm and bottom energy region with different compositions of the four-quark states depending on $J^{PC}$ quantum numbers. Most notably, we find that all states with $C\cdot P=+1$ are dominated by heavy-light meson contributions, whereas for axialvector states with $J^{PC}=1^{+-}$ including the $Z_c(3900)$ we find a much more complicated picture depending on the flavour content. We systematically compare our results for the spectrum with existing experimental results and provide predictions for future analyses.

14 pages, 11 figures

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Cited by in corpus (6)

• Structure of open-flavour four-quark states in the charm and bottom region
• $\lambda$ and $\rho$ Regge trajectories for hidden bottom and charm tetraquarks $(Qq)(\bar{Q}{\bar{q}}^{\prime })$
• Charmoniumlike Channels $1^{+}$ with Isospin $1$ from Lattice and Effective Field Theory
• Hadronic molecules and multiquark states
• Baryonic form factors of light pseudoscalar mesons
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