Scale for the production of jet in high energy e+e- collisions

The scale for visible jets produced in e+e- Collisions is studied in some details using Monte Carlo method. It is demonstrated, based on the historical fact that the 3-jet events were firstly observed in e+e- experiments at √s=17-30 GeV, and the relative transverse momentum for visible jets is in the region kt∼5-10 GeV/c. It is further shown, using a concrete example, that the number of jets in an event could be correctly evaluated only when kt is in this region. The dynamical fluctuations inside jets determined through different values of kt are compared carefully. It turns out that only when kt∼5-10 GeV/c the dynamical fluctuations inside jets will possess the best anomalous scaling property. The relation between the scale 5-10 GeV/c of visible jets and the scale 1-2 GeV of perturbative QCD is discussed