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

Abstract

A study of the dynamical fluctuation property of jets is carried out using 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 jet behave like those in soft hadronic collisions, i.e. being circular in the transverse plan with repect to dynamical fluctuations. This finding obtained from Jetset and Herwig Monte Carlo is encouraged to be checked by experiments.PACS number: 13.85 Hd

A Monte Carlo study on the production scale and internal structure of jets in high energy collisions

“…8 Table 1 The scales for jet production In Table I are listed the scales found in Ref. [17], in Sec. III and this section of the present paper.…”

“…2 of Ref. [17] and Fig. 2 of the present paper the γ parameters of event-dynamicalfluctuations have been shown, where the factorial moments are calculated for the 2-or 3-jet events in the event-thrust frame.…”

“…[17] and have been given the name --circular jet. The scale of circular jet is found to be around k t circ cut = 6.32 ± 0.03 GeV for the 2-jet sample from Jetset 7.4 while 4.28 ± .0.02 GeV for that from Herwig 5.9 .…”

A Monte Carlo Study on the Dynamical Fluctuations Inside Quark and Antiquark Jets

“…When y cut increases γ ϕ increases rapidly and at a certain point γ ϕ crosses over γ pt , turning from γ ϕ < γ pt to γ ϕ > γ pt . A distinct point called transition point [1], where γ ϕ = γ pt , exists in both quark- (Fig.3a) and antiquark (Fig.3b) jets with only slightly different values of y cut -0.0047 for quark jets and 0.0050 for antiquark jets.…”

“…Under these assumptions the study of the dynamical fluctuations inside a single jet could be performed through the investigation of the fluctuations in a 2-jet event. Recently, this kind of investigation has been carried out both theoretically [1] and experimentally [2].…”