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

  • 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 ycut. A transition point (γptφ≠γy) exists, where the dynamical fluctuations are anisotropic in the longitudinal transverse plan and isotropic in the transverse planes. It indicates that the ycut corresponding to the transition point is a physically reasonable cutting parameter for selecting jets and, meanwhile,the relative transverse momentum kt 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.
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  • [1] . 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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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

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 ycut. A transition point (γptφ≠γy) exists, where the dynamical fluctuations are anisotropic in the longitudinal transverse plan and isotropic in the transverse planes. It indicates that the ycut corresponding to the transition point is a physically reasonable cutting parameter for selecting jets and, meanwhile,the relative transverse momentum kt 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.

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