Abstract
Quark and gluon jets are studied in three-jet events generated by Jetset7.4 and Herwig 5.9 at s1/2 = 91.2 GeV. The quark jets are identified byb-tag tracing, and the remaining jet is then defined as the gluon jet. Anew physical variable, i.e. the cone-angle, which is able to describethe geometrical characteristic of the jet, is defined. It turns outthat the cone-angle distribution of the gluon jet is wider than itsmother quark jet, i.e. the gluon jet is ``fatter''. As the multiplicityincreases, the cone-angle distribution of the quark jet has anupward-going trend, i.e. a positive correlation is present. Thecone-angle of the gluon and quark jet versus their transverse momentumdevelop a valley. The mean cone-angles of both the gluon jet and thequark jet are negatively correlated with the transverse momentum forpt < 3 GeV/c, but are positivelycorrelated for pt > 3 GeV/c. The mean cone-anglesof the gluon and quark jets are well separated, showing thatthey can be utilized in the identification of the two kinds of jets.
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