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

Open Access

Observation of $e^{+} e^{-} \to ω χ_{b J} (1 P)$ and Search for $X_{b} \to ω ϒ (1 S)$ at $\sqrt{s}$ near 10.75 GeV

I. Adachi et al. (Belle II Collaboration)

Phys. Rev. Lett. 130, 091902 – Published 3 March 2023

Abstract

We study the processes $e^{+} e^{-} \to ω χ_{b J} (1 P)$ ( $J = 0$ , 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 $ϒ (4 S)$ resonance. We report the first observation of $ω χ_{b J} (1 P)$ 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 $e^{+} e^{-} \to ω χ_{b 1, b 2} (1 P)$ to be consistent with the shape of the $ϒ (10753)$ state. These data indicate that the internal structures of the $ϒ (10753)$ and $ϒ (10860)$ 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 $ω ϒ (1 S)$ . No significant signal is observed for masses between 10.45 and $10.65 GeV / c^{2}$ .

Received 29 August 2022
Accepted 25 January 2023

DOI:https://doi.org/10.1103/PhysRevLett.130.091902

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society