Monte Carlo Study for the Dynamical Fluctuations Inside a Single Jet in 2-Jet Events

ZHANG Kun-Shi; YIN Jian-Wu; CHEN Gang; LIU Chao; LIU Lian-Shou

Chinese Physics C> 2002, Vol. 26> Issue(2) : 158-163

Monte Carlo Study for the Dynamical Fluctuations Inside a Single Jet in 2-Jet Events

Institute of Particle Physics,Huazhong Normal University,Wuhan 430079,China1 Department of Physics,Jingzhou Teacher's College,Hubei 434104,China2 Department of Physics,Huanggang Teacher's College,Hubei 438000,China

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Abstract：
The dynamical fluctuations inside a single jet in the 2 jet events produced in e⁺e^－ collisions at 91.2GeV have been studied using Monte Carlo method. The results show that,the anisotropy of dynamical fluctuations inside a single jet changes remarkably with the variation of the cut parameter y_cut. A transition point (γ_pt=γ_φ≠γ_y) exists, where the dynamical fluctuations are anisotropic in the longitudinal transverse plan and isotropic in the transverse planes. It indicates that the y_cut corresponding to the transition point is a physically reasonable cutting parameter for selecting jets and, meanwhile,the relative transverse momentum k_t at the transition point is the scale for the determination of physical jets. This conclusion is in good agreement with the experimental fact that the third jet (gluon jet) was historically first discovered in the energy region 17—30GeV in e⁺e^－ collisions.

References

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. LIU Lian-Shou, CHEN Gang, FU Jing-Hua, Phys. Rev., 2001, D63: 0540022. Brandt S, Peyrou Ch, Sosnowski R et al. Phys. Lett., 1964, D12: 573. Dokshitzer Yu L. J. Phys., 1991, G17: 1537 4. Lü Yan, YANG Li-Jian, YANG Li-Ping. HEP NP, 2001, 25(11): 1077(in Chinese)(吕, 杨利建, 杨丽平等. 高能物理与核物理, 2001, 25(11): 1077)5. Bialas A, Peschanski R. Nucl. Phys., 1986, B273: 7036. Ochs W. Phys. Lett., 1990, B347: 1017. WU Yuan-Fang, LIU Lian-Shou. Science in China, 1995, A38: 4358. Ochs W. Z. Phys., 1991, C50: 339 9. LIU Lian-Shou, ZHANG Yang, DENG Yue. Z. Phys., 1997, C73: 535 10. LIU Lian-Shou, WU Yuan-Fang. Multi particle Production in High Energy Collisions. Shanghai: Shanghai Scientific and Technical Publishers, 199811. Dokshitzer Yu L, Leder G D, Moretti S et al. JHEP, 1997, 08: 001

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ZHANG Kun-Shi, YIN Jian-Wu, CHEN Gang, LIU Chao and LIU Lian-Shou. Monte Carlo Study for the Dynamical Fluctuations Inside a Single Jet in 2-Jet Events[J]. Chinese Physics C, 2002, 26(2): 158-163.

ZHANG Kun-Shi, YIN Jian-Wu, CHEN Gang, LIU Chao and LIU Lian-Shou. Monte Carlo Study for the Dynamical Fluctuations Inside a Single Jet in 2-Jet Events[J]. Chinese Physics C, 2002, 26(2): 158-163. shu

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Received: 2001-03-29
Revised: 1900-01-01

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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 for the Dynamical Fluctuations Inside a Single Jet in 2-Jet Events

Corresponding author: LIU Lian-Shou,

Institute of Particle Physics,Huazhong Normal University,Wuhan 430079,China1 Department of Physics,Jingzhou Teacher's College,Hubei 434104,China2 Department of Physics,Huanggang Teacher's College,Hubei 438000,China

Received Date: 2001-03-29
Accepted Date: 1900-01-01
Available Online: 2002-02-05

Abstract: The dynamical fluctuations inside a single jet in the 2 jet events produced in e⁺e^－ collisions at 91.2GeV have been studied using Monte Carlo method. The results show that,the anisotropy of dynamical fluctuations inside a single jet changes remarkably with the variation of the cut parameter y_cut. A transition point (γ_pt=γ_φ≠γ_y) exists, where the dynamical fluctuations are anisotropic in the longitudinal transverse plan and isotropic in the transverse planes. It indicates that the y_cut corresponding to the transition point is a physically reasonable cutting parameter for selecting jets and, meanwhile,the relative transverse momentum k_t at the transition point is the scale for the determination of physical jets. This conclusion is in good agreement with the experimental fact that the third jet (gluon jet) was historically first discovered in the energy region 17—30GeV in e⁺e^－ collisions.