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

Abstract

We report measurents of the continuum $R_{\mathrm{uds}}$ near the center-of-mass energy of 3.70 GeV, the $R_{\mathrm{uds}(\mathrm{c})+\psi (3770)}(s)$ and the $R_{\mathrm{had}}(s)$ values in $e^{+}{e}^{-}$ annihilation at 68 energy points in the energy region between 3.650 and 3.872 GeV with the BES-II detector at the BEPC Collodier. We obtain the $R_{\mathrm{uds}}$ for the continuum light hadron (containing u, d and s quarks) production near the $D\bar{D}$ threshold to be $R_{\mathrm{uds}}=2.141\pm 0.025\pm 0.085$.

5 pages, 3 figures

References in corpus (3)

• 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)
• A Monte Carlo Generator for Full Simulation of e+e- to hadrons Cross section Scan Experiment

Cited by in corpus (17)

• Heavy Quark Masses from Sum Rules in Four-Loop Approximation
• 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
• Measurement of the Cross Section for $e^{+}{e}^{-}\to$ hadrons at Energies from 2.2324 to 3.6710 GeV
• Charm-quark mass from weighted finite energy QCD sum rules
• Charm Quark Mass with Calibrated Uncertainty
• Precise ${\alpha }_s$ determination from charmonium sum rules
• Measurement of cross sections for $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}$ at center-of-mass energies from 3.80 to 4.60 GeV
• Wave-Packet Effects: A Solution for Isospin Anomalies in Vector-Meson Decay
• Electronic width of the $\psi (3770)$ resonance interfering with the background
• $\tau$ mass and $R$ value measurements at BES
• Perturbative QCD below charm threshold: theory and tensions with $e^{+}{e}^{-}$ data
• $\mathcal{R}(3780)$ 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
• The $R_{uds}$ value in the vicinity of $\psi (3770)$ state
• Charm quark mass determined from a pair of sum rules
• Precise quark masses from sum rules
• A new determination of the charm mass from the non-analytic reconstruction of the heavy quark correlator
• Update of hadronic decays of $J/\psi$ and $\psi (2S)$ though virtual photons