Quark and gluon jets are studied in three-jet events generated by Jetset 7.4 and Herwig 5.9 at √=91.2 GeV.The quark jets are identified by b-tag tracing, and the remaining jet is then defined as the gluon jet. A new physical variable, i.e. the cone-angle, which is able to describe the geometrical characteristic of the jet, is defined.It turns out that the cone-angle distribution of the gluon jet is wider than its mother quark jet, i.e. the gluon jet is “fatter”. As the multiplicity increases, the cone-angle distribution of the quark jet has an upward-going trend,i.e. a positive correlation is present. The cone-angle of the gluon and quark jet versus their transverse momentum develop a valley. The mean cone-angles of both the gluon jet and the quark jet are negatively correlated with the transverse momentum for pt 3GeV/c. The mean cone-angles of the gluon and quark jets are well separated, showing that they can be utilized in the identification of the two kinds of jets.
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机译：The reduction of computational time of the Monte Carlo method, applied to radiative heat transfer with variable properties, by using a fixed properties loop
