Measurement of the total cross section for $e^{+}{e}^{-}\to$hadrons at $\sqrt{s}=10.52\mathrm{}$ GeV

Using the CLEO detector at the Cornell Electron Storage Ring, we have made a measurement of $R\equiv \sigma {(e}^{+}{e}^{-}\to \mathrm{hadrons})/\sigma {(e}^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-})=3.56\mathrm{}\pm 0.01\pm 0.07$ at $\sqrt{s}$=10.52 GeV. This implies a value for the strong coupling constant of ${\alpha }_s\left(10.52\mathrm{}\hspace{0.5em}\mathrm{GeV}\right)=0.20\mathrm{}\pm 0.01\pm 0.06$, or ${\alpha }_s{(M}_Z)=0.13\mathrm{}\pm 0.005\pm 0.03$.