Measurement of R from 2 to 5 GeV and related QCD topics at BES

作者：Yan WB^*; Zhao ZG

来源：Nuclear Physics B - Proceedings Supplements, 2004, 133: 182-185.

DOI：10.1016/j.nuclphysbps.2004.04.161

We report the R = alpha(e(+)e(-) --> hadrons)/sigma(e(+)e(-) --> mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider. Using the same data sample, we also present the inclusive momentum spectra and multiplicity distribution. These results are compared with both experimental data from high energy e(+)e(-), ep and p (p) over bar experiments and QCD calculations.

• 出版日期2004-7