Search for $e^{+}{e}^{-}\to \gamma {\chi }_{bJ}$ ($J$ = 0, 1, 2) near $\sqrt{s}=10.746$ GeV at Belle II

Abstract

We search for the $e^{+}{e}^{-}\to \gamma {\chi }_{bJ}$ ($J$ = 0, 1, 2) processes at center-of-mass energies $\sqrt{s}$ = 10.653, 10.701, 10.746, and 10.804 GeV. These data were collected with the Belle II detector at the SuperKEKB collider and correspond to 3.5, 1.6, 9.8, and 4.7 fb${}^{-1}$ of integrated luminosity, respectively. We set upper limits at the 90\% confidence level on the Born cross sections for $e^{+}{e}^{-}\to \gamma {\chi }_{bJ}$ at each center-of-mass energy $\sqrt{s}$ near 10.746 GeV. The upper limits at 90\% confidence level on the Born cross sections for $e^{+}{e}^{-}\to \gamma {\chi }_{b1}$ are significantly smaller than the corresponding measured values for $e^{+}{e}^{-}\to \omega {\chi }_{b1}$ and $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\rm Y}(2S)$ at $\sqrt{s}$ = 10.746 GeV.

arXiv commentBelle II Preprint 2025-022, KEK Preprint 2025-21

References in corpus (27)

• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• The $XYZ$ states: experimental and theoretical status and perspectives
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• SuperKEKB Collider
• Precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
• The Belle II Core Software
• Radiative return at NLO and the measurement of the hadronic cross-section in electron-positron annihilation
• Bottomonium Mesons and Strategies for Their Observation
• Spectroscopy at B-factories Using Hard Photon Emission
• Higher bottomonium zoo
• Spectrum of the Hidden-Bottom and the Hidden-Charm/Strange Exotics in the Dynamical Diquark Model
• Exotic to standard bottomonium transitions
• Bottomonium spectrum in the relativistic flux tube model
• Computation of the quarkonium and meson-meson composition of the ${\rm Y}(nS)$ states and of the new ${\rm Y}(10753)$ Belle resonance from lattice QCD static potentials
• Vector hidden-bottom tetraquark candidate: $Y(10750)$
• Interpretation of $Y_b(10750)$ as a tetraquark and its production mechanism
• Observation of a new structure near 10.75 GeV in the energy dependence of the $e^{+}{e}^{-}\to {\rm Y}(nS){\pi }^{+}{\pi }^{-}$ ($n=1,2,3$) cross sections
• ${\rm Y}(nl)$ decay into $B^{(\ast )}{\bar{B}}^{(\ast )}$
• Modern meson spectroscopy: the fundamental role of unitarity
• K-matrix Analysis of $e^{+}{e}^{-}$ Annihilation in the Bottomonium Region
• 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
• Measurement of the integrated luminosity of data samples collected during 2019-2022 by the Belle II experiment
• Study of $I=0$ bottomonium bound states and resonances in $S$, $P$, $D$ and $F$ waves with lattice QCD static-static-light-light potentials
• Evidence for $e^{+}{e}^{-}\to \gamma {\chi }_{c1,2}$ at center-of-mass energies from 4.009 to 4.360 GeV
• Observation of $e^{+}{e}^{-}\to \gamma {\chi }_{c1}$ and search for $e^{+}{e}^{-}\to \gamma {\chi }_{c0},\gamma {\chi }_{c2},$ and $\gamma {\eta }_c$ at $\sqrt{s}$ near 10.6 GeV at Belle
• Bottomonia in an unquenched quark model