Search for charmonium and charmonium-like states in ${\rm Y}(1S)$ radiative decays

Abstract

Using a sample of 102 million ${\rm Y}(1S)$ events collected with the Belle detector, we report on the first search for charge-parity-even charmonium and charmonium-like states in ${\rm Y}(1S)$ radiative decays. No significant ${\chi }_{cJ}$ or ${\eta }_c$ signal is observed and 90% C.L. limits on $\BR(Υ(1S)\to γχ_{c0})<6.5 \times 10^{-4}$, $\BR(Υ(1S)\to γχ_{c1})<2.3\times 10^{-5}$, $\BR(Υ(1S)\to γχ_{c2})<7.6 \times 10^{-6}$, and $\BR(Υ(1S)\to γη_c)<5.7\times 10^{-5}$ are obtained. The product branching fraction limits $\BR(Υ(1S)\to γX(3872)) \BR(X(3872)\toπ^+π^-\jpsi)< 1.6 \times 10^{-6}$, $\BR(Υ(1S)\to γX(3872)) \BR(X(3872)\toπ^+π^-π^0 \jpsi)< 2.8\times 10^{-6}$, $\BR(Υ(1S)\to γX(3915)) \BR(X(3915)\toω\jpsi)< 3.0\times 10^{-6}$, and $\BR(Υ(1S)\to γY(4140)) \BR(Y(4140)\to ϕ\jpsi)<2.2\times 10^{-6}$ are obtained at the 90% C.L. Furthermore, no evidence is found for excited charmonium states below 4.8 GeV/$c^2$.

9 pages, 3 figures. Minor corrections to etac mass fit. Accepted for publication in PRD(RC)

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Cited by in corpus (10)

• The hidden-charm pentaquark and tetraquark states
• The $XYZ$ states: experimental and theoretical status and perspectives
• Inclusive $h_c$ production at $B$ factories
• Observation of new resonant structures in $\gamma \gamma \to \omega \varphi$, $\varphi \varphi$ and $\omega \omega$
• Search for charmonium and charmonium-like states in Υ(2S) radiative decays
• Search for $XYZ$ states in ${\rm Y}(1S)$ inclusive decays
• Next-to-leading-order QCD corrections to a vector bottomonium radiative decay into a charmonium
• Review of Physics Results from the Tevatron: Heavy Flavor Physics
• Experimental review of the ${\rm Y}(1S,2S,3S)$ physics at $e^{+}{e}^{-}$ colliders and the LHC
• Observation of the radiative decays of ${\rm Y}(1S)$ to ${\chi }_{c1}$