Scale for the Production of Jets in High Energy e+e Collisions

  • The scale for visible jets produced in e+e Collisions is studied in some details using Monte Carlo method. It is demonstrated, based on the historical fact that the 3-jet events were firstly observed in e+ e- experiments at √S=17—30GeV,and the relative transverse momentum for visible jets is in the region kt,~5—10GeV/c. It is further shown, using a concrete example, that the number of jets in an event could be correctly evaluated only when kt is in this region. The dynamical fluctuations inside jets determined through different values of kt are compared carefully. It turns out that only when kt,~5—10GeV/c the dynamical fluctuations inside jets will possess the best anomalous scaling property. The relation between the scale 5-10GeV/c of visible jets and the scale 1-2GeV of perturbative QCD is discussed.
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  • [1] Sterman G, Weinberg S. Phys. Rev. Lett.1977,39:14362 Dokshitzer Yu L. J Phys. 1991,617:15373 Ali A, Barreiro F. Jets in Annihilatio and QCD. In:Eds. Ali A,Soding P. High Energy Electron-Positron Physics. Singapore; World Sci-entific.1988. 612-6944 Hanson G et al. Phys. Rev. Lett., 1975,35:16095 Brandelik R et al (TASSO Coll.)Phys. Lett., 1979 , B86 : 243 ; Barber D. P(Mark J Coll.).Phys . Rev . Lett ., 1979, 43: 830; Berger Ch et al(PLUTO Coll.).Phys. Lett., 1979 , B86 : 418 ; Bartel W et al ( JADE Coll.). Phys. Lett.,1980,B91:L426 Dokshitzer Yu L,Leder G D,Moretti S et al. JHEP,1997,08;0017 Sjtistrand. Comp. Phys. Comm., 1992,67:4658 LIU Lian-Shou, CHEN Gang, FU Jing-Hua. Phys. Rev., 2001, D63:osaoo29 ZHANG Kun-Shi, YIN Jian-Wu, CHEN Gang et al. HEPNP,2002,:ls8(m Chinese);ZHANG Kun-Shi.CHEN Gang.YU Mei-Iang et al. A Monte Carlo Study on the Dynamical Fluctuations Inside Quark and An-tiquark Jets. HEP-ph/0203098(张昆实, 尹建武, 陈刚等.高能物理与核物理, 2002.26:1S8)10 LIU Lian-Shou. Phase Space Partition in High Energy Collisions, HEP- PH/020400311 Bjorken J D. Geometry of Multihadron Production, Proc. XXN Intem.Symp. on Multiparticle Dynamics, Vietri sul Mare, 1994, Eds. A. Gio-vannini et al. Singapore;World Scientific,199s.57912 Bialas A,Peschanski R. Nucl. Phys., 1986,B273:703;1988,308:85713 Ochs W.Z. Phys., 1991, C50; 339; Bialas A, Gazdzichi M. Phys. Lett ., 1990,B252:483
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LIN Xiao-Yan and LIU Lian-Shou. Scale for the Production of Jets in High Energy e+e Collisions[J]. Chinese Physics C, 2003, 27(1): 7-11.
LIN Xiao-Yan and LIU Lian-Shou. Scale for the Production of Jets in High Energy e+e Collisions[J]. Chinese Physics C, 2003, 27(1): 7-11. shu
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Received: 2002-04-25
Revised: 1900-01-01
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Scale for the Production of Jets in High Energy e+e Collisions

    Corresponding author: LIU Lian-Shou,
  • Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Abstract: The scale for visible jets produced in e+e Collisions is studied in some details using Monte Carlo method. It is demonstrated, based on the historical fact that the 3-jet events were firstly observed in e+ e- experiments at √S=17—30GeV,and the relative transverse momentum for visible jets is in the region kt,~5—10GeV/c. It is further shown, using a concrete example, that the number of jets in an event could be correctly evaluated only when kt is in this region. The dynamical fluctuations inside jets determined through different values of kt are compared carefully. It turns out that only when kt,~5—10GeV/c the dynamical fluctuations inside jets will possess the best anomalous scaling property. The relation between the scale 5-10GeV/c of visible jets and the scale 1-2GeV of perturbative QCD is discussed.

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