Measurement of $e^{+}{e}^{-}\to \eta J/\psi$ Cross Section from $\sqrt{s}=$ 3.808 GeV to 4.951 GeV

Abstract

Using data samples with an integrated luminosity of 22.42 fb${}^{-1}$ collected by the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the $e^{+}e^{-}\rightarrow\etaJ/ψ$ process at center-of-mass energies from 3.808 to 4.951 GeV. Three structures are observed in the line shape of the measured cross sections. A maximum-likelihood fit with $\psi (4040)$, two additional resonances, and a non-resonant component is performed. The mass and width of the first additional state are $(4219.7\pm 2.5\pm 4.5)\mathrm{MeV}/{\mathrm{c}}^2$ and $(80.7\pm 4.4\pm 1.4)\mathrm{MeV}$, respectively, consistent with the $\psi (4230)$. For the second state, the mass and width are $(4386\pm 13\pm 17)\mathrm{MeV}/{\mathrm{c}}^2$ and $(177\pm 32\pm 13)\mathrm{MeV}$, respectively, consistent with the $\psi (4360)$. The first uncertainties are statistical and the second ones are systematic. The statistical significance of $\psi (4040)$ is $8.0\sigma$ and those for $\psi (4230)$ and $\psi (4360)$ are more than $10.0\sigma$.

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Cited by in corpus (5)

• Global coupled-channel analysis of $e^{+}{e}^{-}\to c\bar{c}$ processes in $\sqrt{s}=3.75-4.7$ GeV
• Reevaluating the $\psi (4160)$ Resonance Parameter Using $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$ Data in the Context of Unquenched Charmonium Spectroscopy
• Coupled-channel study of $4S$-$3D$ mixing dynamics in $\psi (4220)$ and $\psi (4380)$
• Cross section measurement of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0\psi (3686)$ from $\sqrt{s}=$ 4.008 GeV to 4.951 GeV
• Pinpointing Physical Solutions in Y(4230) Decays