Saved in:
| Main Author: | |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.02771 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Table of 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.