Monte Carlo Study on the Properties of Gluon and Quark Jets

ZHANG Kun-Shi; CHEN Gang; YU Mei-Ling; LIU Lian-Shou

Chinese Physics C> 2002, Vol. 26> Issue(11) : 1110-1116

Monte Carlo Study on the Properties of Gluon and Quark Jets

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

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Abstract：
The 3 jet events produced in e⁺e^－ collisions at 91.2GeV have been studied using Monte Carlo method. After applying two angular cuts the three angles between the jets are used to identify the individual jet in 3 jet events. The energy distributions of the three jets, the mean particle multiplicities, mean transverse momenta of the three jets in equal energy bins and their distributions have been analyzed. Comparing with the corresponding results from the quark jets in 2 jet events, a simple method to select gluon and quark jets from 3 jet events is obtained. The properties of the gluon and quark jets being selected using the introduced method are in qualitative agreement with the expectations of perturbative QCD. The ratio of the mean multiplicity between quark and gluon jets, _gluon/_quark, has been calculated. The results, again, agree with the experimental results from SLD, OPAL, ALEPH, and DELPHI Collaborations, indicating that the method proposed to select gluon and quark jets from 3 jet events is reasonable.

References

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ZHANG Kun-Shi, CHEN Gang, YU Mei-Ling and LIU Lian-Shou. Monte Carlo Study on the Properties of Gluon and Quark Jets[J]. Chinese Physics C, 2002, 26(11): 1110-1116.

ZHANG Kun-Shi, CHEN Gang, YU Mei-Ling and LIU Lian-Shou. Monte Carlo Study on the Properties of Gluon and Quark Jets[J]. Chinese Physics C, 2002, 26(11): 1110-1116. shu

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Received: 2001-12-24
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Monte Carlo Study on the Properties of Gluon and Quark Jets

Corresponding author: LIU Lian-Shou,

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Received Date: 2001-12-24

Accepted Date: 1900-01-01

Available Online: 2002-11-05

Abstract: The 3 jet events produced in e⁺e^－ collisions at 91.2GeV have been studied using Monte Carlo method. After applying two angular cuts the three angles between the jets are used to identify the individual jet in 3 jet events. The energy distributions of the three jets, the mean particle multiplicities, mean transverse momenta of the three jets in equal energy bins and their distributions have been analyzed. Comparing with the corresponding results from the quark jets in 2 jet events, a simple method to select gluon and quark jets from 3 jet events is obtained. The properties of the gluon and quark jets being selected using the introduced method are in qualitative agreement with the expectations of perturbative QCD. The ratio of the mean multiplicity between quark and gluon jets, _gluon/_quark, has been calculated. The results, again, agree with the experimental results from SLD, OPAL, ALEPH, and DELPHI Collaborations, indicating that the method proposed to select gluon and quark jets from 3 jet events is reasonable.

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Monte Carlo Study on the Properties of Gluon and Quark Jets

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