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

Abstract

By analyzing the $R$ values measured at 68 energy points in the energy region between 3.650 and 3.872 GeV reported in our previous paper, we have precisely measured the mass, the total width, the leptonic width and the leptonic decay branching fraction of the $\psi (3770)$ to be $M_{\psi (3770)}=3772.4\pm 0.4\pm 0.3$ MeV, ${\Gamma }_{\psi (3770)}^{\mathrm{tot}}=28.6\pm 1.2\pm 0.2$ MeV, ${\Gamma }_{\psi (3770)}^{ee}=279\pm 11\pm 13$ eV and $B[\psi (3770)\to e^{+}{e}^{-}]=(0.98\pm 0.04\pm 0.04)\times 10^{-5}$, respectively, which result in the observed cross section ${\sigma }^{\mathrm{obs}}[e^{+}{e}^{-}\to \psi (3770)]=7.25\pm 0.27\pm 0.34$ nb at $\sqrt{s}=3772.4$ MeV. We have also measured $R_{\mathrm{uds}}=2.121\pm 0.023\pm 0.084$ for the continuum light hadron production in the region from 3.650 to 3.872 GeV.

5 pages, 2 figures

References in corpus (4)

• 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)
• Measurements of the continuum $R_{\mathrm{uds}}$ and $R$ values in $e^{+}{e}^{-}$ annihilation in the energy region between 3.650 and 3.872 GeV
• A Monte Carlo Generator for Full Simulation of e+e- to hadrons Cross section Scan Experiment

Cited by in corpus (10)

• Heavy quarkonium: progress, puzzles, and opportunities
• Charmonium
• Quarkonia and their transitions
• Observation of di-structures in $e^{+}{e}^{-}\to J/\psi \mathrm{X}$ at center-of-mass energies around 3.773 GeV
• Wave-Packet Effects: A Solution for Isospin Anomalies in Vector-Meson Decay
• Electronic width of the $\psi (3770)$ resonance interfering with the background
• Measurement of $\mathcal{B}(\psi (3770)\to \gamma {\chi }_{c1})$ and search for $\psi (3770)\to \gamma {\chi }_{c2}$
• The $R_{uds}$ value in the vicinity of $\psi (3770)$ state
• $\mathcal{R}(3780)$ 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
• Improved description of e^+e^- \to p\bar{p}π^0 cross section line shape and more stringent constraints on ψ(3770) and ψ(4230) \to p\bar{p}π^0