Analysis of the Charged and Neutral Energy Flow in E exp + E exp - Hadronic Annihilation at 34 GeV, and a Determination of the QCD Effective Coupling Constant

摘要

Using both charged and neutral components, 2600 multihadronic e exp + e exp - annihilation events, recorded at 34 GeV by the CELLO detector at PETRA, have been analysed in a calorimetric approach. The fraction of energy carried by gamma rays is measured to be fsub( gamma ) = 26.0 +- 0.4 (stat) +- 4.0 (syst) %. The neutral energy flow is seen to follow closely the overall energy flow. From the corrected oblateness distribution, a first order determination of alpha sub(s) is performed. The result is alpha sub(s) = .16 +- .01 (stat) +- .03. (ERA citation 08:008532)