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

The BES collaboration Ablikim, M. ; Bai, J.Z. ; Bai, Y. ; et al.
Phys.Lett.B 677 (2009) 239-245, 2009.
Inspire Record 814778 DOI 10.17182/hepdata.51953

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.

1 data table
Table 1

R values.


rivet Analysis
Measurements of the Cross Section for e+e- -> hadrons at Center-of-Mass Energies from 2 to 5 GeV

The BES collaboration Bai, J.Z. ; Ban, Y. ; Bian, J.G. ; et al.
Phys.Rev.Lett. 88 (2002) 101802, 2002.
Inspire Record 552757 DOI 10.17182/hepdata.41990

We report values of $R = \sigma(e^+e^-\to {hadrons})/\sigma(e^+e^-\to\mu^+\mu^-)$ for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.

1 data table
Table 1

Measured values of R.


rivet Analysis
A Measurement of J / psi decay widths

The BES collaboration Bai, J.Z. ; Chen, G.P. ; Chen, H.F. ; et al.
Phys.Lett.B 355 (1995) 374-380, 1995.
Inspire Record 39870 DOI 10.17182/hepdata.28500

The cross sections for e + e − → hadrons, e + e − , μ + μ − have been measured in the vicinity of the J Ψ resonance using the BES detector operated at BEPC. The partial widths for J Ψ to hadrons, electrons, muons and the total width have been determined to be Γ h = 74.1 ± 8.1 keV, Γ e = 5.14 ± 0.39 keV, Γ μ = 5.13 ± 0.52 keV, and Γ = 84.4 ± 8.9 keV, respectively.

1 data table
Table 1

No description provided.


rivet Analysis
Measurement of the Total Cross Section for Hadronic Production by e+e- Annihilation at Energies between 2.6-5 Gev

The BES collaboration Bai, J.Z. ; Ban, Y. ; Bian, J.G. ; et al.
Phys.Rev.Lett. 84 (2000) 594-597, 2000.
Inspire Record 505323 DOI 10.17182/hepdata.41611

Using the upgraded Beijing Spectrometer (BESII), we have measured the total cross section for $e^+e^-$ annihilation into hadronic final states at center-of-mass energies of 2.6, 3.2, 3.4, 3.55, 4.6 and 5.0 GeV. Values of $R$, $\sigma(e^+e^-\to {hadrons})/\sigma(e^+e^-\to\mu^+\mu^-)$, are determined.

1 data table
Table 1

Data are corrected for acceptance and radiative effects.