Measurement of Born cross sections for $e^+e^-\to\omega\chi_{bJ}$ and $\pi^+\pi^-\pi^0\chi_{bJ}$ ($J$ = 0, 1, 2) at Belle and Belle II

Sumitted to PubDB: 2025-02-21

Category: Physics / performance paper

Tags: Belle Run 1

Principal Authors Sen Jia, Chengping Shen
Date 2026-04-15
Working group Quarkonium
Belle II Number BELLE2-PUB-PH-2025-010
Abstract We study the processes $χ_{bJ}\,ω$ and $χ_{bJ}\,(π^+π^-π^0)_{\rm non-ω}$ ($J$ = 0, 1, 2) at center-of-mass energies $\sqrt{s}$ from 10.73--11.02 GeV using a $142.5\,\mathrm{fb}^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider; and at $\sqrt{s}\sim10.75$ GeV using a $19.8\,\mathrm{fb}^{-1}$ sample collected with Belle II at SuperKEKB. We find that the $Υ(10753)$ state decays into $χ_{bJ}\,ω$ but not into $χ_{bJ}\,(π^+π^-π^0)_{\rm non-ω}$, while the $Υ(10860)$ state, in contrast, decays into $χ_{bJ}\,(π^+π^-π^0)_{\rm non-ω}$ but not into $χ_{bJ}\,ω$. The mass and width of the $Υ(10753)$ state are measured to be $(10756.1\pm3.4({\rm stat.})\pm2.7({\rm syst.}))$ MeV/$c^2$ and $(32.2\pm11.3({\rm stat.})\pm14.9({\rm syst.}))$ MeV. The products of the partial width to $e^+e^-$ and branching fractions for $Υ(10753)\toχ_{b1}\,ω$ and $Υ(10753)\toχ_{b2}\,ω$ are ($1.46\pm0.25({\rm stat.})\pm 0.20({\rm syst.})$) eV and ($1.29\pm0.38({\rm stat.})\pm 0.31({\rm syst.})$) eV.
ArXiv https://arxiv.org/abs/2510.25461
Inspire https://inspirehep.net/literature/3074740
Bibtex 
@article{Belle-II:2025jus,
    author = "Adachi, I. and others",
    collaboration = "Belle-II, Belle",
    title = "{Improved measurement of Born cross sections for $χ_{bJ}\,ω$ and $χ_{bJ}\,(π^+π^-π^0)_{\rm non-ω}$ ($J$ = 0, 1, 2) at Belle and Belle II}",
    eprint = "2510.25461",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint 2025-003, KEK Preprint 2024-52",
    month = "10",
    year = "2025"
}
Journal JHEP
Preprint Number Belle II Preprint 20

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