Comparison of the Geometrical Characters Inside Quark- and Gluon-jet Produced by Different Flavor Quarks

TL;DR

This study compares the angular distribution characteristics of quark and gluon jets with different flavors using Monte Carlo simulations, revealing distinct geometrical features and correlations with multiplicity and transverse momentum.

Contribution

It introduces a detailed analysis of cone angles in quark and gluon jets across flavors, highlighting differences in angular distributions and their dependence on jet properties.

Findings

Gluon jets have wider angular distributions than quark jets.

Average cone angles of gluon jets are larger than those of quark jets.

Angular distribution with momentum weight shows a non-monotonic trend with multiplicity and transverse momentum.

Abstract

The characters of the angular distributions of quark jets and gluon jets with different flavors are carefully studied after introducing the cone angle of jets. The quark jets and gluon jets are identified from the 3-jet events which are produced by Monte Carlo simulation Jetset7.4 in e+e- collisions at $\sqrt s$=91.2GeV. It turns out that the ranges of angular distributions of gluon jets are obviously wider than that of quark jets at the same energies. The average cone angles of gluon jets are much larger than that of quark jets. As the multiplicity or the transverse momentum increases, the cone-angle distribution without momentum weight of both the quark jet and gluon jet all increases, i.e the positive linear correlation are present, but the cone-angle distribution with momentum weight decreases at first, then increases when n > 4 or p_t > 2 GeV. The characters of cone angular distributions of gluon jets produced by quarks with different flavors are the same, while there are obvious differences for that of the quark jets with different flavors.