Calculation of the Productive Dilepton Spectrum (M≤4GeV/c2) in 238U+238U Collisions at Ec,m≈200GeV/u

Li Panlin; Deng Chengfeng; Wang Lilian; Xu Mengjie

Chinese Physics C> 1999, Vol. 23> Issue(7) : 693-700

Calculation of the Productive Dilepton Spectrum (M≤4GeV/c²) in ²³⁸U+²³⁸U Collisions at E_c,m≈200GeV/u

Department of physics, Suzhou Railway Normal College, Suzhou 2150092 Department of Mathematics, Shanghai University, Shanghai 201800

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Abstract：
In this paper, besides including u,d,s quarks and their anti-quarks the charm quarks and their anti-quarks (cc) were still included in the calculation of flavour kinetics of quarks. Using relativitic hydrodynamics model with the effect of quark flavor kinetics, invariable mass dilepton spectrum of M≤4GeV/c² has been calculated. The dileptons are eastted from Phase transihon process of an expansion quark matter which is created in collisions of 238U+238U at energy～200GeV/u. The numerical results have been compared with experimental dare of CERN SPS qualitatively. A prelimings conclusion has been given: quark fragmentation and effect of flavour kinetics are the causes of suppression of the peak of J/ψ→μ⁺+μ^－.

References

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Kajantie K, kataja M, Mclarran L et al. Phys. Rev., 1986, D34: 811–8212 Masera M. Nucl. Phys., 1995, A590: 93c–102c 3 Bare H W, Friman B L, Knall J et al. Nucl. Phys., 1988, A484: 661–6844 Kajantie K, raitio R, Ruus Kanen P V. Nucl. Phys., 1983, B222: 152–1885 Koch P, Muller B, Rafelski J. Phys. Reports,1986, 142(314): 1676 Li Panlin, Wu Hua, Xu Mengjie. High Energy Physics and Nuclear Physics (in Chinese), 1997, 21:918–925(李盘林, 吴华, 许梦杰. 高能物理与核物理,1997,21:918–9257 Wu hua, Xu Mengjie, Li Panlin. Chinese General Computational Physics (in Chinese), 1999, 16:94(王立联, 许梦杰, 李盘林, 计算物理, 1999,16:94)

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Li Panlin, Deng Chengfeng, Wang Lilian and Xu Mengjie. Calculation of the Productive Dilepton Spectrum (M≤4GeV/c²) in ²³⁸U+²³⁸U Collisions at E_c,m≈200GeV/u[J]. Chinese Physics C, 1999, 23(7): 693-700.

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Received: 1998-02-09
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

Calculation of the Productive Dilepton Spectrum (M≤4GeV/c²) in ²³⁸U+²³⁸U Collisions at E_c,m≈200GeV/u

Corresponding author: Li Panlin,

Department of physics, Suzhou Railway Normal College, Suzhou 2150092 Department of Mathematics, Shanghai University, Shanghai 201800

Received Date: 1998-02-09
Accepted Date: 1900-01-01
Available Online: 1999-07-05

Abstract: In this paper, besides including u,d,s quarks and their anti-quarks the charm quarks and their anti-quarks (cc) were still included in the calculation of flavour kinetics of quarks. Using relativitic hydrodynamics model with the effect of quark flavor kinetics, invariable mass dilepton spectrum of M≤4GeV/c² has been calculated. The dileptons are eastted from Phase transihon process of an expansion quark matter which is created in collisions of 238U+238U at energy～200GeV/u. The numerical results have been compared with experimental dare of CERN SPS qualitatively. A prelimings conclusion has been given: quark fragmentation and effect of flavour kinetics are the causes of suppression of the peak of J/ψ→μ⁺+μ^－.