Observation of 
${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\chi}}_{bJ}(1P)$ 
and Search for 
${X}_{b}\ensuremath{\rightarrow}\ensuremath{\omega}\mathrm{\ensuremath{\Upsilon}}(1S)$ 
at $\sqrt{s}$ near 10.75 GeV

The Belle-II Collaboration,; Adachi, I.; et al.,

doi:10.1103/PhysRevLett.130.091902

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Observation of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\chi}}_{bJ}(1P)$ and Search for ${X}_{b}\ensuremath{\rightarrow}\ensuremath{\omega}\mathrm{\ensuremath{\Upsilon}}(1S)$ at $\sqrt{s}$ near 10.75 GeV

MPS-Authors

The Belle-II Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adachi, I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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https://publications.mppmu.mpg.de/2022/MPP-2022-356/FullText.pdf
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Citation

The Belle-II Collaboration, Adachi, I., & et al. (2023). Observation of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\chi}}_{bJ}(1P)$ and Search for ${X}_{b}\ensuremath{\rightarrow}\ensuremath{\omega}\mathrm{\ensuremath{\Upsilon}}(1S)$ at $\sqrt{s}$ near 10.75 GeV. Physical Review Letters, 130, 091902. doi:10.1103/PhysRevLett.130.091902.

Cite as: https://hdl.handle.net/21.11116/0000-000F-1152-1

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/$c^2$.