Monte Carlo study of the dynamical-fluctuation property of the hadronic system inside jets

A study of the dynamical fluctuation property of jets is carried out using the Monte Carlo method. The results suggest that, unlike the average properties of the hadronic system inside jets, the anisotropy of dynamical fluctuations in these systems changes abruptly with the variation of the cut parameter y_cut. A transition point exists, where the dynamical fluctuations in the hadronic system inside jets behave like those in soft hadronic collisions, i.e., being circular in the transverse plane with respect to dynamical fluctuations. This finding obtained from JETSET and HERWIG Monte Carlo programs is encouraged to be checked by experiments.