A Measurement of the Total Cross Section for $e^{+}e^{-}\to hadrons$ at $\sqrt{s}$=10.52 GeV

TL;DR

This paper reports a precise measurement of the ratio of hadronic to muonic cross sections in electron-positron collisions at 10.52 GeV, providing insights into the strong coupling constant at this energy.

Contribution

The study provides a new measurement of R and the strong coupling constant alpha_s at 10.52 GeV using the CLEO detector, improving precision over previous results.

Findings

Measured R = 3.56 ± 0.01 ± 0.07 at 10.52 GeV

Determined alpha_s(10.52 GeV) = 0.20 ± 0.01 ± 0.06

Estimated alpha_s(M_Z) = 0.13 ± 0.005 ± 0.03

Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have made a measurement of R=sigma(e+e- ->hadrons)/sigma(e+e- ->mu+mu-) =3.56+/-0.01+/-0.07 at ECM=10.52 GeV. This implies a value for the strong coupling constant of alpha_s(10.52 GeV)=0.20+/-0.01+/-0.06, or alpha_s(M_Z)=0.13+/-0.005+/-0.03.