Observation of $e^+ e^{\mathstrut -} \to \omega \chi_{bJ}$ and search for $X_b \to \omega \Upsilon(1S)$ at $\sqrt{s}$ near 10.75 GeV

Sumitted to PubDB: 2022-06-24

Category: Physics / performance paper

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Principal Authors Sen Jia, Chengping Shen
Date 2023-03-03
Working group Quarkonium
Belle II Number BELLE2-PUB-PH-2022-005
Abstract We study the processes $e^+e^-\to\omega\chi_{bJ}(1P)$ ($J$ = 0, 1, or 2) using samples at center-of-mass energies $\sqrt{s}$ = 10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8, and 4.7 fb$^{-1}$ of integrated luminosity, respectively. These data were collected with the Belle II detector during special operations of the SuperKEKB collider above the $\Upsilon(4S)$ resonance. We report the first observation of $\omega\chi_{bJ}(1P)$ signals at $\sqrt{s}$ = 10.745 GeV. By combining Belle II data with Belle results at $\sqrt{s}$ = 10.867 GeV, we find energy dependencies of the Born cross sections for $e^+e^-\to \omega\chi_{b1,b2}(1P)$ to be consistent with the shape of the $\Upsilon(10753)$ state. These data indicate that the internal structures of the $\Upsilon(10753)$ and $\Upsilon(10860)$ states may differ. Including data at $\sqrt{s}$ = 10.653 GeV, we also search for the bottomonium equivalent of the $X(3872)$ state decaying into $\omega\Upsilon(1S)$. No significant signal is observed for masses between 10.45 and 10.65 GeV/$c^2$.
ArXiv https://arxiv.org/abs/2208.13189
Inspire https://inspirehep.net/literature/2142648
DOI 10.1103/PhysRevLett.130.091902
Reference Phys.Rev.Lett. 130, 091902 (2023)
Bibtex 
@article{Belle-II:2022xdi,
    author = "Adachi, I. and others",
    collaboration = "Belle-II",
    title = "{Observation of e+e-{\textrightarrow}{\ensuremath{\omega}}{\ensuremath{\chi}}bJ(1P) and Search for Xb{\textrightarrow}{\ensuremath{\omega}}{\Upsilon}(1S) at s near 10.75~GeV}",
    eprint = "2208.13189",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint 2022-004; KEK Preprint 2022-24",
    doi = "10.1103/PhysRevLett.130.091902",
    journal = "Phys. Rev. Lett.",
    volume = "130",
    number = "9",
    pages = "091902",
    year = "2023"
}
Journal Phys.Rev.Lett.

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