Charmonium Production and Absorption in P－A and A－A Collision

Yao Xiaoxia; Zhang Xiaofei; Qiao Congfeng; Zhao Weiqin

Chinese Physics C> 1999, Vol. 23> Issue(3) : 268-280

Charmonium Production and Absorption in P－A and A－A Collision

Institute of High Energy Physics,The Chinese Academy of Sciences, Beijing 1000392 CCASTWorld Laboratory,Beijing 1000803 Department of Physics, Hebei Teacher's University, Shijiazhuang 050016

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Abstract：
J/ψ and ψ′production cross sections in fixed-target experiment is calculated, considering the contributions from both color-singlet and color- octet mechanisms. The resultS are applied to the investigations of the J/ψ suppression and the ψ′/ψ ratio problems in p-A collisions. The results agree with the experimental data as the (cc)-nucleon absorption cross sections σ_abs⁸≈10mb for (cc)₈and σ_abs¹≈0mb for (cc) .The model is further used to investigate A-A collisions when comover absorption mechanism is also considered. It is found that the observed experiment data of J/ψ and ψ′/ψ ratio in S-U collisions and Pb-Pb collisions can not be explained consistently within this model. The possibility of QGP formation in S-U and Pb-Pbcollisions is also discussed.

References

[1]

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Yao Xiaoxia, Zhang Xiaofei, Qiao Congfeng and Zhao Weiqin. Charmonium Production and Absorption in P－A and A－A Collision[J]. Chinese Physics C, 1999, 23(3): 268-280.

Yao Xiaoxia, Zhang Xiaofei, Qiao Congfeng and Zhao Weiqin. Charmonium Production and Absorption in P－A and A－A Collision[J]. Chinese Physics C, 1999, 23(3): 268-280. shu

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Received: 1998-01-16
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

Charmonium Production and Absorption in P－A and A－A Collision

Corresponding author: Yao Xiaoxia,

Institute of High Energy Physics,The Chinese Academy of Sciences, Beijing 1000392 CCASTWorld Laboratory,Beijing 1000803 Department of Physics, Hebei Teacher's University, Shijiazhuang 050016

Received Date: 1998-01-16

Accepted Date: 1900-01-01

Available Online: 1999-03-05

Abstract: J/ψ and ψ′production cross sections in fixed-target experiment is calculated, considering the contributions from both color-singlet and color- octet mechanisms. The resultS are applied to the investigations of the J/ψ suppression and the ψ′/ψ ratio problems in p-A collisions. The results agree with the experimental data as the (cc)-nucleon absorption cross sections σ_abs⁸≈10mb for (cc)₈and σ_abs¹≈0mb for (cc) .The model is further used to investigate A-A collisions when comover absorption mechanism is also considered. It is found that the observed experiment data of J/ψ and ψ′/ψ ratio in S-U collisions and Pb-Pb collisions can not be explained consistently within this model. The possibility of QGP formation in S-U and Pb-Pbcollisions is also discussed.

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Charmonium Production and Absorption in P－A and A－A Collision

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