Observation of di-structures in $e^{+}{e}^{-}\to J/\psi \mathrm{X}$ at center-of-mass energies around 3.773 GeV

Abstract

We report a measurement of the observed cross sections of the inclusive $J/\psi$ production in $e^{+}{e}^{-}\to J/\psi \mathrm{X}$ based on 3.21 fb${}^{-1}$ of data accumulated at energies from 3.645 to 3.891 GeV with the BESIII detector operated at the BEPCII collider. The energy-dependent lineshape obtained from the measured cross sections cannot be well described by two Breit-Wigner (BW) amplitudes of the expected decays $\psi (3686)\to J/\psi \mathrm{X}$ and $\psi (3770)\to J/\psi \mathrm{X}$. Instead it can be better described with three BW amplitudes of the decays $\psi (3686)\to J/\psi \mathrm{X}$, $R(3760)\to J/\psi \mathrm{X}$ and $R(3790)\to J/\psi \mathrm{X}$ with two distinct structures referred to as $R(3760)$ and $R(3790)$. Under this assumption, we extracted their masses, total widths, and the product of the leptonic width and decay branching fractions to be $M_{R(3760)}=3761.7\pm 2.2\pm 1.2$ MeV/$c^2$, ${\Gamma }_{R(3760)}^{\mathrm{tot}}=6.7\pm 11.1\pm 1.1$ MeV, ${\Gamma }_{R(3760)}^{ee}\mathcal{B}[R(3760)\to J/\psi \mathrm{X}]=(4.0\pm 4.3\pm 1.2)$ eV, $M_{R(3790)}=3784.7\pm 5.7\pm 1.6$ MeV/$c^2$, ${\Gamma }_{R(3790)}^{\mathrm{tot}}=31.6\pm 11.9\pm 3.2$ MeV, ${\Gamma }_{R(3790)}^{ee}\mathcal{B}[R(3790)\to J/\psi \mathrm{X}]=(18.1\pm 10.3\pm 4.7)$ eV, where the first uncertainties are statistical and second systematic.

8 pages, 3 figures

References in corpus (7)

• 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
• Evidence of Two Resonant Structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{h}_c$
• Measurements of the cross sections for $e^{+}{e}^{-}\to \mathrm{hadrons}$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $\psi (3770)\to \mathrm{non}-D\bar{D}$
• Measurements of the braching fractions for psi(3770)--> D0D0-bar,D+D-,DD-bar$ and the resonance parameters of psi(3770) and psi(2S)
• Precison Measurements of the Mass, the Widths of $\psi (3770)$ Resonance and the Cross Section $\sigma [e^{+}{e}^{-}\to \psi (3770)]$ at $E_{\mathrm{cm}}=3.7724$ GeV
• General mathematical analysis on multiple solutions of interfering resonances combinations
• Measurement of $\mathcal{B}(\psi (3770)\to \gamma {\chi }_{c1})$ and search for $\psi (3770)\to \gamma {\chi }_{c2}$

Cited by in corpus (5)

• First Observation of a Three-Resonance Structure in $e^{+}{e}^{-}\to$Nonopen Charm Hadrons
• $\mathcal{R}(3780)$ Resonance Interpreted as the $1^3{D}_1$-Wave Dominant State of Charmonium from Precise Measurements of the Cross Section of $e^{+}{e}^{-}\to$ Hadrons
• Unified coupled-channel description for the five near-threshold structures $\psi (3770)$, $G(3900)$, $R(3760)$, $R(3780)$ and $R(3810)$ from $e^{+}{e}^{-}$ annihilation
• Measurement of the Inclusive Cross Sections of Prompt $J/\psi$ and $\psi (3686)$ Production in $e^{+}{e}^{-}$ Annihilation from $\sqrt{s}=3.808$ to $4.951$ GeV
• Systematic analysis of the D-wave charmonium states with the QCD sum rules