Studies of hadron spectroscopy at Belle and Belle II
Fuente:
arXiv
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908880940826624 |
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| author | Wallner, S. |
| author_facet | Wallner, S. |
| contents | The Belle and Belle II experiments have collected a $1.6\,\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at center-of-mass energies near the $Υ(nS)$ resonances. We conduct searches for transitions from the spin-singlet $h_b(1P,2P)$ states to the spin-triplet $Υ(1S)$ and $χ_{bJ}(1P)$ states. We do not find evidence for the $h_b(1P,2P)\to Υ(1S) π^0$ and $h_b(2P) \to χ_{bJ}(1P)γ$ transitions. We find the first evidence for the $h_b(2P)\to Υ(1S)η$ transition. However, the measured branching fraction is lower than expected from related decays. Furthermore, we find evidence for $P_{c\bar c s}(4459)^0 \to J/ψΛ$ decays in inclusive $Υ(1S,2S)$ decays. This is the first evidence for an exotic state produced in $Υ(1S,2S)$ decays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_02771 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Studies of hadron spectroscopy at Belle and Belle II Wallner, S. High Energy Physics - Experiment The Belle and Belle II experiments have collected a $1.6\,\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at center-of-mass energies near the $Υ(nS)$ resonances. We conduct searches for transitions from the spin-singlet $h_b(1P,2P)$ states to the spin-triplet $Υ(1S)$ and $χ_{bJ}(1P)$ states. We do not find evidence for the $h_b(1P,2P)\to Υ(1S) π^0$ and $h_b(2P) \to χ_{bJ}(1P)γ$ transitions. We find the first evidence for the $h_b(2P)\to Υ(1S)η$ transition. However, the measured branching fraction is lower than expected from related decays. Furthermore, we find evidence for $P_{c\bar c s}(4459)^0 \to J/ψΛ$ decays in inclusive $Υ(1S,2S)$ decays. This is the first evidence for an exotic state produced in $Υ(1S,2S)$ decays. |
| title | Studies of hadron spectroscopy at Belle and Belle II |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2511.02771 |