Study of the near-threshold $\omega \varphi$ mass enhancement in doubly OZI suppressed $J/\psi \to \gamma \omega \varphi$ decays

Abstract

A 2.25$\times 10^8$ $\jpsi$ event sample accumulated with the BESIII detector is used to study the doubly OZI suppressed decay modes $\jpsi\toγ\of$, $ω\to\ppp$, $ϕ\to\kk$. A strong deviation ($>$ 30$\sigma$) from three-body $\jpsi\toγωϕ$ phase space is observed near the $\omega \varphi$ mass threshold that is consistent with a previous observation reported by the BESII experiment. A partial wave analysis with a tensor covariant amplitude that assumes that the enhancement is due to the presence of a resonance, the X(1810), is performed, and confirms that the spin-parity of the X(1810) is $0^{++}$. The mass and width of the X(1810) are determined to be $M=1795\pm 7$(stat)${}_{-5}^{+13}$(syst)$\pm$19(mod) MeV/$c^2$ and $\Gamma =95\pm 10$(stat)${}_{-34}^{+21}$(syst)$\pm$75(mod) MeV/$c^2$, respectively, and the product branching fraction is measured to be ${\cal B}(\jpsi\toγX(1810))\times{\cal B}(X(1810)\to\of)=(2.00\pm0.08$(stat)${}_{-1.00}^{+0.45}$(syst)$\pm$1.30(mod))$\times 10^{-4}$. %where the first error is the statistical error and the second the systematical error. These results are consistent within errors with those of the BESII experiment.

References in corpus (6)

• Study of ${\chi }_{cJ}$ radiative decays into a vector meson
• Confirmation of the X(1835) and observation of the resonances X(2120) and X(2370) in J/psi->gamma pi^+pi^-eta'
• Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative Decays
• How Resonances can synchronise with Thresholds
• On the near-threshold enhancement in $J/\psi \to \gamma X$ with $X\to \omega \varphi$
• Production of a Q^2\bar{Q}^2 state in J/ψ\to γωϕ

Cited by in corpus (18)

• An updated review of the new hadron states
• Observation of an isoscalar resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $J/\psi \to \gamma \eta {\eta }^{\prime }$
• Scalar isoscalar mesons and the scalar glueball from radiative $J/\psi$ decays
• Partial wave analysis of $J/\psi \to \gamma \eta {\eta }^{\prime }$
• Revisiting Scalar Glueballs
• Observation of a structure at 1.84 GeV/c${}^2$ in the $3({\pi }^{+}{\pi }^{-})$ mass spectrum in $J/\psi \to \gamma 3({\pi }^{+}{\pi }^{-})$ decays
• Glueballs as rotating folded closed strings
• Search for the tensor glueball
• Theoretical study of scalar meson $a_0(1710)$ in the ${\eta }_c\to {\bar{K}}^0{K}^{+}{\pi }^{-}$ reaction
• Unveiling the $a_0(1710)$ nature in the process $J/\psi \to {\bar{K}}^0{K}^{+}{\rho }^{-}$
• Ordinary and exotic mesons in the extended Linear Sigma Model
• Using QCD Counting rules to Identify the Production of Gluonium
• Measurement of the cross sections for $e^{+}{e}^{-}\to \eta {\pi }^{+}{\pi }^{-}$ at center-of-mass energies between 2.00 and 3.08 GeV
• Observation of the electromagnetic doubly OZI-suppressed decay $J/\psi \to \varphi {\pi }^0$
• Low-energy $N\varphi$ scattering from a pole-enhanced triangle diagram
• Observation of the $X(1840)$ at BESIII
• Charmonium and light hadron spectroscopy
• Charmonium and Light Meson Spectroscopy