Determination of αs from energy-energy correlations in e+e− annihilation at 29 GeV

Abstract

We have studied the energy-energy correlation in $e^{+}$ $e^{\mathrm{-}}$ annihilation into hadrons at √s =29 GeV using the Mark II detector at the SLAC storage ring PEP. We find to O(${\alpha }_s^2$) that ${\alpha }_s$=0.158±0.003±0.008 if hadronization is described by string fragmentation. Independent fragmentation schemes give ${\alpha }_s$=0.10–0.14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well.