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

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

2009-03-05

arxiv.org/abs/0903.0900v1

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 4 figures, 3 tables

Scientific paper

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.

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