We investigate hadronization of charged particles in annihilation at Center of mass energies. Our results are consistent with the Webber and the LUND parton shower models but show significant deviations from the LUND ...

coupling constant in standard model is investigated by using the electron positron data.

scale less than about 2 GeV/c the QCD coupling constant becomes

large enough that perturbation theory cannot be used. Below this scale one must