Chinese Physics C > 1999, Vol. 23 > Issue(7): 689-692

Are There J/ψ Anomalous Suppressions in 158 A GeV/c Pb+Pb Collisions?

China Institute of Atomic Energy Beijing 1024132 Institute of High Energy Physics, The Chinese Academy of Sciences Beijing 100039

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Abstract：
The mechanisms of the energy degradation of leading particle, of the effechve dissociation of CC pair (the precursor of physical J/ψ) in the colour electric field of strings, and of the hadronic absorption (both baryon and meson) are introduced into the proposed hadron and string cascade model, JPCIAE. That has been used to calculate the J/ψ suppression factors in pA, AB (with light projectile), and Pb+Pb collisions at 200 A GeV/c energy. The theorehcal results reproduce simultaneously both the cormsponding NA38 and NA50 data fairly well, which arises the queshon of whther there art J/ψ anomalous suppressions in 158 A GeV/c Pb+Pb collisions.

References

[1]

Sa Benhao, Tai An, Wang Hui. High Energy Phys. and Nucl. Phys. (in Chinese), 1999, 23:489(萨本豪,台安,王辉.高能物理与核物理,1999,23:489)2 NA3 Collab., Badier J et al. Z. Phys., 1983, C20: 101 3 NA38 Collab., Berlin C et al. 1989, B220: 471; 1990, B251: 465, 472; 1991, B255: 459; 1991, B270: 105;1995, B345: 6174 NA50 Collab., Gonin M et al. Nucl. Phys., 1996, A610: 404c 5 Geiss J, Greiner, C Bratkovskaya E L et al. nucl–th/98030086 Loh S, Greiner C, Mosel U. Phys. Lett., 1997, B404: 2387 Cassing W, Ko C M. Phys. Lett., 1997, B396:398 Cassing W, Bratkovskaya E L. Nucl. Phys., 1997, A623:5709 Mueller B. nucl–th/9806023 10 Tai An, Sa Benhao. Phys. Lett., 1997, B409:393; Phys. Rev., 1998, C57:26111 Vogt R. Phys. Lett., 1998, B430: 15

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Sa Benhao, Tai An and Wang Hui. Are There J/ψ Anomalous Suppressions in 158 A GeV/c Pb+Pb Collisions?[J]. Chinese Physics C, 1999, 23(7): 689-692.

Sa Benhao, Tai An and Wang Hui. Are There J/ψ Anomalous Suppressions in 158 A GeV/c Pb+Pb Collisions?[J]. Chinese Physics C, 1999, 23(7): 689-692. shu

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Received: 1998-10-08
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

Are There J/ψ Anomalous Suppressions in 158 A GeV/c Pb+Pb Collisions?

Corresponding author:Sa Benhao,

China Institute of Atomic Energy Beijing 1024132 Institute of High Energy Physics, The Chinese Academy of Sciences Beijing 100039

Received Date:1998-10-08
Accepted Date:1900-01-01
Available Online:1999-07-05

Abstract:The mechanisms of the energy degradation of leading particle, of the effechve dissociation of CC pair (the precursor of physical J/ψ) in the colour electric field of strings, and of the hadronic absorption (both baryon and meson) are introduced into the proposed hadron and string cascade model, JPCIAE. That has been used to calculate the J/ψ suppression factors in pA, AB (with light projectile), and Pb+Pb collisions at 200 A GeV/c energy. The theorehcal results reproduce simultaneously both the cormsponding NA38 and NA50 data fairly well, which arises the queshon of whther there art J/ψ anomalous suppressions in 158 A GeV/c Pb+Pb collisions.