Measurements of the cross sections for $e^{+}{e}^{-}\to \mathrm{hadrons}$ at 3.650, 3.6648, 3.773 GeV and the branching fraction for $\psi (3770)\to \mathrm{non}-D\bar{D}$

Abstract

Using the BES-II detector at the BEPC Collider, we measured the lowest order cross sections and the $R$ values ($R={\sigma }_{e^{+}{e}^{-}\to \mathrm{hadrons}}^0/{\sigma }_{e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}}^0$) for inclusive hadronic event production at the center-of-mass energies of 3.650 GeV, 3.6648 GeV and 3.773 GeV. The results lead to ${\bar{R}}_{uds}=2.224\pm 0.019\pm 0.089$ which is the average of these measured at 3.650 GeV and 3.6648 GeV, and $R=3.793\pm 0.037\pm 0.190$ at $\sqrt{s}=3.773$ GeV. We determined the lowest order cross section for $\psi (3770)$ production to be ${\sigma }_{\psi (3770)}^{\mathrm{B}}=(9.575\pm 0.256\pm 0.813)\mathrm{nb}$ at 3.773 GeV, the branching fractions for $\psi (3770)$ decays to be $BF(\psi (3770)\to D^0{\bar{D}}^0)=(48.9\pm 1.2\pm 3.8)$, $BF(\psi (3770)\to D^{+}{D}^{-})=(35.0\pm 1.1\pm 3.3)$ and $BF(\psi (3770)\to D\bar{D})=(83.9\pm 1.6\pm 5.7)$, which result in the total non-$D\bar{D}$ branching fraction of $\psi (3770)$ decay to be $BF(\psi (3770)\to \mathrm{non}-D\bar{D})=(16.1\pm 1.6\pm 5.7)$.

arXiv comment11 pages, 5 figures

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• Updated Estimate of the Muon Magnetic Moment Using Revised Results from e+e- Annihilation
• Reanalysis of Hadronic Cross Section Measurements at CMD-2
• Measurements of the Cross Section for e+e- -> hadrons at Center-of-Mass Energies from 2 to 5 GeV
• Measurement of the Total Cross Section for Hadronic Production by e+e- Annihilation at Energies between 2.6-5 Gev
• A determination of the QED coupling at the $Z$ pole
• Observation of psi(3770)--> pi pi J/psi and Measurement of Gamma_{ee}[psi(2S)]
• Evidence of psi(3770) non-DD-bar Decay to J/psi pi+pi-
• BESII Detector Simulation
• Measurement of sigma(e^+e^- --> psi(3770) --> hadrons) at E_{cm}=3773 MeV
• Radiative corrections for pion and kaon production at $e^{+}{e}^{-}$ colliders of energies below 2 GeV
• First Observation of psi(3770) --> gamma chi_{c1} --> gamma gamma J/psi
• Measurement of Cross Sections for $D^0{\bar{D}}^0$ and $D^{+}{D}^{-}$ Production in $e^{+}{e}^{-}$ Annihilation at $\sqrt{s}=3.773$ GeV
• A Measurement of Psi(2S) Resonance Parameters

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