Measurements of R/sub Hadron/ at 5 Less Than or Equal to E/sub C.M./ Less Than or Equal to 8 GeV as a Test of QCD

摘要

The hadron yield in e exp + e exp - annihilation normalized to the lowest order mu -pair cross section (R/sub h/) is measured with systematic errors of +-6 to 8%, using the Crystal Ball detector at SPEAR. In the energy range of this measurement (5.2 to 7.0 GeV), the prediction of QCD for R/sub h/, calculated to second order, is tested.