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| Main Author: | |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2306.17120 |
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| _version_ | 1866929557603352576 |
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| author | Bruschini, R. |
| author_facet | Bruschini, R. |
| contents | We examine the couplings of quarkonium hybrids to heavy-light meson pairs in the Born-Oppenheimer approximation for QCD. The lowest hybrid multiplets consist of bound states of the $Π_u$ and $Σ_u^-$ potentials. We find that the $Σ_u^-$ potential can couple to pairs of $S$-wave mesons through string breaking, while the $Π_u$ potential cannot. From this observation, we derive model-independent selection rules that contradict previous expectations that quarkonium hybrids are forbidden to decay into pairs of $S$-wave mesons. These Born-Oppenheimer selection rules are consistent with the partial decay widths of the lowest charmonium hybrid with exotic quantum numbers $J^{PC}=1^{-+}$ recently calculated in lattice QCD. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_17120 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Why quarkonium hybrid coupling to two S-wave heavy-light mesons is not suppressed Bruschini, R. High Energy Physics - Phenomenology We examine the couplings of quarkonium hybrids to heavy-light meson pairs in the Born-Oppenheimer approximation for QCD. The lowest hybrid multiplets consist of bound states of the $Π_u$ and $Σ_u^-$ potentials. We find that the $Σ_u^-$ potential can couple to pairs of $S$-wave mesons through string breaking, while the $Π_u$ potential cannot. From this observation, we derive model-independent selection rules that contradict previous expectations that quarkonium hybrids are forbidden to decay into pairs of $S$-wave mesons. These Born-Oppenheimer selection rules are consistent with the partial decay widths of the lowest charmonium hybrid with exotic quantum numbers $J^{PC}=1^{-+}$ recently calculated in lattice QCD. |
| title | Why quarkonium hybrid coupling to two S-wave heavy-light mesons is not suppressed |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2306.17120 |