# Study on the Characters of Angular Distribution of Quark Jets and Gluon Jets

• The 3-jet events are produced by Monte Carlo simulation Jetset7.4 in e+e collisions at s=91.2GeV. After introducing the cone angle of jets, we carefully studied the characters of the angular distributions of quark jets and gluon jets with different flavors. 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 for the same charged particle multiplicity or the same transverse momentum. There are linear relations in the distributions of the average cone angles of jets as functions of the charged multiplicity and the transverse momentum. The angular distribution properties of gluon jets produced by quarks with different flavors are the same, while there are obvious differences among the distributions of cone angles for quark jets of different flavors.
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WEI Hui-Ling and CHEN Gang. Study on the Characters of Angular Distribution of Quark Jets and Gluon Jets[J]. Chinese Physics C, 2007, 31(10): 907-912.
WEI Hui-Ling and CHEN Gang. Study on the Characters of Angular Distribution of Quark Jets and Gluon Jets[J]. Chinese Physics C, 2007, 31(10): 907-912.
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Revised: 2007-01-04
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沈阳化工大学材料科学与工程学院 沈阳 110142

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## Study on the Characters of Angular Distribution of Quark Jets and Gluon Jets

###### Corresponding author: CHEN Gang,
• Department of Physics, China University of Geosciences, Wuhan 430074, China

Abstract: The 3-jet events are produced by Monte Carlo simulation Jetset7.4 in e+e collisions at s=91.2GeV. After introducing the cone angle of jets, we carefully studied the characters of the angular distributions of quark jets and gluon jets with different flavors. 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 for the same charged particle multiplicity or the same transverse momentum. There are linear relations in the distributions of the average cone angles of jets as functions of the charged multiplicity and the transverse momentum. The angular distribution properties of gluon jets produced by quarks with different flavors are the same, while there are obvious differences among the distributions of cone angles for quark jets of different flavors.

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