Observation of $e^{+}{e}^{-}\to \omega {\chi }_{bJ}(1P)$ and search for $X_b\to \omega {\rm Y}(1S)$ at $\sqrt{s}$ near 10.75 GeV

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 ${\rm Y}(4S)$ 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 ${\rm Y}(10753)$ state. These data indicate that the internal structures of the ${\rm Y}(10753)$ and ${\rm Y}(10860)$ 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 $\omega {\rm Y}(1S)$. No significant signal is observed for masses between 10.45 and 10.65 GeV/$c^2$.

7 pages, 3 figures, accepted by PRL

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• Enhanced breaking of heavy quark spin symmetry
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Cited by in corpus (9)

• Hidden-bottom hadronic transitions of ${\rm Y}(10753)$
• Mass spectrum of $1^{--}$ heavy quarkonium
• Status and Prospects of Exotic Hadrons at Belle II
• Hunting for $X_b$ via hidden bottomonium decays $X_b\to \pi \pi {\chi }_{bJ}$
• Bottomonia in an unquenched quark model
• Decays of ${\rm Y}(10860)$ and ${\rm Y}(10753)$ into $\omega {\chi }_{bJ}$
• Search for $e^{+}{e}^{-}\to \gamma {\chi }_{bJ}$ ($J$ = 0, 1, 2) near $\sqrt{s}=10.746$ GeV at Belle II
• Study of $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\psi (h=\pi ,K,p)$ via initial-state radiation at Belle~II
• Exotic hadrons associated with $b$-quark