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/$c^2$.

arXiv comment7 pages, 3 figures, accepted by PRL

References in corpus (44)

• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Heavy quarkonium: progress, puzzles, and opportunities
• 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
• The New Heavy Mesons: A Status Report
• The Belle II Physics Book
• QCD and strongly coupled gauge theories: challenges and perspectives
• From the Deuteron to Deusons, an Analysis of Deuteronlike Meson-Meson Bound States
• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• New Exotic Meson and Baryon Resonances from Doubly-Heavy Hadronic Molecules
• Consequences of Heavy Quark Symmetries for Hadronic Molecules
• SuperKEKB Collider
• Can the X(3872) be a 1^{++} four-quark state?
• Masses of heavy tetraquarks in the relativistic quark model
• The Belle II Core Software
• X(3872): Hadronic Molecules in Effective Field Theory
• Radiative return at NLO and the measurement of the hadronic cross-section in electron-positron annihilation
• Spectroscopy at B-factories Using Hard Photon Emission
• Bottomonium spectrum revisited
• A case for hidden $b\bar{b}$ tetraquarks based on $e^{+}{e}^{-}\to b\bar{b}$ cross section between $\sqrt{s}=10.54$ and 11.20 GeV
• Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
• Spectrum of the Hidden-Bottom and the Hidden-Charm/Strange Exotics in the Dynamical Diquark Model
• Observation of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^0{\chi }_{bJ}$ and search for $X_b\to \omega {\rm Y}(1S)$ at $\sqrt{s}\sim 10.867$ GeV
• Production of the bottom analogues and the spin partner of the X(3872) at hadron colliders
• Search for a new bottomonium state decaying to Upsilon(1S) pi+ pi- in pp collisions at sqrt(s) = 8 TeV
• 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: $Y(10750)$
• Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment
• 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
• Search for the $X_b$ and other hidden-beauty states in the ${\pi }^{+}{\pi }^{-}{\rm Y}(1\mathrm{S})$ channel at ATLAS
• ${\rm Y}(nl)$ decay into $B^{(\ast )}{\bar{B}}^{(\ast )}$
• Resonant parameters of the $Y(4220)$
• Relativistic model of hidden bottom tetraquarks
• Hadronic cross section of $e^{+}{e}^{-}$ annihilation at bottomonium energy region
• Hunting for the X_b via Radiative Decays
• Enhanced breaking of heavy quark spin symmetry
• Modern meson spectroscopy: the fundamental role of unitarity
• K-matrix Analysis of $e^{+}{e}^{-}$ Annihilation in the Bottomonium Region
• Does the bottomonium counterpart of $X(3872)$ exist?

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• 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