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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.05312 |
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| _version_ | 1866916726596173824 |
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| author | Ortega, Pablo G. Entem, David R. Fernández, Francisco Segovia, Jorge |
| author_facet | Ortega, Pablo G. Entem, David R. Fernández, Francisco Segovia, Jorge |
| contents | We perform a coupled-channels study of the $bb\bar c\bar c$ and $bc\bar b\bar c$ tetraquark systems in a molecular approach using a constituent quark model which has been widely used to satisfactorily describe a broad range of properties of heavy quark hadron systems, either conventional or exotic. Within a molecular framework, the interaction in the heavy quark sector is governed by gluon exchange or confinement forces that are inherently color-dependent. While the $B_c B_c$ system contains two identical quarks, enabling stronger interactions via exchange diagrams, the forces in the $B_c \bar{B}_c$ and $(c\bar{c})-(b\bar{b})$ systems are expected to be significantly weaker. Consequently, the theoretical and experimental analysis of $B_c^{(*)} B_c^{(*)}$, $B_c^{(*)} \bar{B}_c^{(*)}$, and charmonium-bottomonium bound structures could play a crucial role in clarifying the dominant mechanisms responsible for the formation of fully-heavy tetraquarks. For the $bb\bar c\bar c$ tetraquark sector, we find several resonance states with different spin-parity quantum numbers. These resonances are characterized by their proximity, but not too close, to the $B_c^{(\ast)}B_c^{(\ast)}$ thresholds and their large total decay widths, indicating strong decay channels. In contrast, our analysis of the $bc\bar b\bar c$ tetraquark sector reveals no bound states, virtual states, or resonances; suggesting that tetraquark states of the $(c\bar c)-(b\bar b)$ or $B_c^{(\ast)}\bar B_c^{(\ast)}$ molecular type are unlikely to be formed, within our model assumptions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05312 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constituent-quark-model based coupled-channels calculation of the $\mathbf{bb\bar c\bar c}$ and $\mathbf{bc\bar b\bar c}$ tetraquark systems Ortega, Pablo G. Entem, David R. Fernández, Francisco Segovia, Jorge High Energy Physics - Phenomenology We perform a coupled-channels study of the $bb\bar c\bar c$ and $bc\bar b\bar c$ tetraquark systems in a molecular approach using a constituent quark model which has been widely used to satisfactorily describe a broad range of properties of heavy quark hadron systems, either conventional or exotic. Within a molecular framework, the interaction in the heavy quark sector is governed by gluon exchange or confinement forces that are inherently color-dependent. While the $B_c B_c$ system contains two identical quarks, enabling stronger interactions via exchange diagrams, the forces in the $B_c \bar{B}_c$ and $(c\bar{c})-(b\bar{b})$ systems are expected to be significantly weaker. Consequently, the theoretical and experimental analysis of $B_c^{(*)} B_c^{(*)}$, $B_c^{(*)} \bar{B}_c^{(*)}$, and charmonium-bottomonium bound structures could play a crucial role in clarifying the dominant mechanisms responsible for the formation of fully-heavy tetraquarks. For the $bb\bar c\bar c$ tetraquark sector, we find several resonance states with different spin-parity quantum numbers. These resonances are characterized by their proximity, but not too close, to the $B_c^{(\ast)}B_c^{(\ast)}$ thresholds and their large total decay widths, indicating strong decay channels. In contrast, our analysis of the $bc\bar b\bar c$ tetraquark sector reveals no bound states, virtual states, or resonances; suggesting that tetraquark states of the $(c\bar c)-(b\bar b)$ or $B_c^{(\ast)}\bar B_c^{(\ast)}$ molecular type are unlikely to be formed, within our model assumptions. |
| title | Constituent-quark-model based coupled-channels calculation of the $\mathbf{bb\bar c\bar c}$ and $\mathbf{bc\bar b\bar c}$ tetraquark systems |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.05312 |