Single jet structure ine + e − annihilation

By using JETSET 7.2 ase ⁺ e ^? event generator at different c.m. energies, we studiedsingle jet multiplicity distributions in different rapidity andp _T intervals. Good NB behavior is found and related clan structure analysis is performed. Observed differences in the behavior of the 2-and 3-jet samples can be understood in terms of the relative contribution of single quark and gluon jet to the 3-jet sample, which are obtained by selecting event by event in this sample the highest and the lowest energy jet respectively.