Fully heavy asymmetric scalar tetraquarks
| Autor: | Agaev, S. S., Azizi, K., Sundu, H. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The scalar tetraquarks $T_{b}$ and $T_{c}$ with asymmetric contents $bb \overline{b}\overline{c}$ and $cc \overline{c}\overline{b}$ are explored using the QCD sum rule method. These states are modeled as the diquark-antidiquarks composed of the axial-vector components. The masses and current couplings of $T_{b}$ and $T_{c}$ are calculated using the two-point sum rule approach. The predictions obtained for the masses of these four-quark mesons prove that they are unstable against the strong two-meson fall-apart decays to conventional mesons. In the case of the tetraquark $ T_{b}$ this is the decay $T_{\mathrm{b}}\to \eta _{b}B_{c}^{-}$. The processes $T_{\mathrm{c}}\rightarrow \eta _{c}B_{c}^{+}$ and $J/\psi B_{c}^{\ast +}$ are kinematically allowed decay modes of the tetraquark $ T_{c}$. The widths of corresponding processes are evaluated by employing the QCD three-point sum rule approach which are necessary to estimate strong couplings at the tetraquark-meson-meson vertices of interest. The mass $ m=(15697 \pm 95)~\mathrm{MeV}$ and width $\Gamma[T_b]=(36.0 \pm 10.2)~ \mathrm{MeV}$ of the tetraquark $T_{b}$ as well as the parameters $ \widetilde{m}=(9680 \pm 102)~\mathrm{MeV}$ and $\Gamma[T_c]=(54.7 \pm 9.9)~ \mathrm{MeV}$ in the case of $T_{c}$ provide useful information to search for and interpret new exotic states. Comment: 10 Pages and 5 Figures. arXiv admin note: text overlap with arXiv:2410.22439 |
| Databáze: | arXiv |
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