$R$ value measurements for $e^{+}{e}^{-}$ annihilation at 2.60, 3.07 and 3.65 GeV

Abstract

Using a data sample with a total integrated luminosity of 10.0 pb${}^{-1}$ collected at center-of-mass energies of 2.6, 3.07 and 3.65 GeV with BESII, cross sections for $e^{+}{e}^{-}$ annihilation into hadronic final states ($R$ values) are measured with statistical errors that are smaller than 1%, and systematic errors that are about 3.5%. The running strong interaction coupling constants ${\alpha }_s^{(3)}(s)$ and ${\alpha }_s^{(5)}(M_Z^2)$ are determined from the $R$ values.

14 pages, 4 figures, 3 tables

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• Precision measurements of sigma_hadronic for alpha_eff(E) at ILC energies and (g-2)_mu
• BESII Detector Simulation
• Determination of the strong coupling constant from the CLEO measurement of the total hadronic cross section in $e^{+}{e}^{-}$ annihilation below 10.56 GeV
• Magnetic moment of the pentaquark ${\Theta }^{+}(1540)$ with QCD sum rules
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• Observation of $e^{+}{e}^{-}\to {\chi }_{c0}\omega$ and missing higher charmonium $\psi (4S)$
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• Tuning and validation of hadronic event generator for $R$ value measurements in the tau-charm region
• Measurement of $R_{\text{uds}}$ and $R$ between 3.12 and 3.72 GeV at the KEDR detector
• Measurement of ψ(3770) parameters
• Precise measurement of $R_{\text{uds}}$ and $R$ between 1.84 and 3.72 GeV at the KEDR detector
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• Measurement of the Cross Section for $e^{+}{e}^{-}\to$ hadrons at Energies from 2.2324 to 3.6710 GeV
• Measurement of main parameters of the ψ(2S) resonance
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• Hadronic Contribution to the muon $g-2$ factor
• Recurrent form of the renormalization group relations for the higher-order hadronic vacuum polarization function perturbative expansion coefficients
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• A discussion on vacuum polarization correction to the cross-section of $e^{+}{e}^{-}\to {\gamma }^{\ast }/\psi \to {\mu }^{+}{\mu }^{-}$
• Perturbative QCD below charm threshold: theory and tensions with $e^{+}{e}^{-}$ data
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• Coupled-channel study of $4S$-$3D$ mixing dynamics in $\psi (4220)$ and $\psi (4380)$
• Evaluation of the three-flavor quark-disconnected contribution to the muon anomalous magnetic moment from experimental data
• Update of hadronic decays of $J/\psi$ and $\psi (2S)$ though virtual photons