Influence of System Size Dependence of Energy Loss on Hadron Spectra Suppression

WANG Xiao-Dong; ZHANG Han-Zhong; WANG En-Ke

Chinese Physics C> 2007, Vol. 31> Issue(6) : 553-557

Influence of System Size Dependence of Energy Loss on Hadron Spectra Suppression

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

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Abstract：
Based on parton model in QCD, at the leading-order approximation we studied the π⁰ spectra and nuclear modification factor R_AA in Au+Au and Cu+Cu collisions with different centralities. Because of parton jet energy loss in heavy ion collision, large transverse momentum hadrons spectra are suppressed as compared to p+p collisions at the same energy. It is shown that the suppression has strong dependence on the system size which determines the amount of the jet energy loss. The bigger the system is, the larger parton energy loss is. It results in the much more suppression of the spectra and also the much less R_AA.

References

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WANG Xiao-Dong, ZHANG Han-Zhong and WANG En-Ke. Influence of System Size Dependence of Energy Loss on Hadron Spectra Suppression[J]. Chinese Physics C, 2007, 31(6): 553-557.

WANG Xiao-Dong, ZHANG Han-Zhong and WANG En-Ke. Influence of System Size Dependence of Energy Loss on Hadron Spectra Suppression[J]. Chinese Physics C, 2007, 31(6): 553-557. shu

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Received: 2006-09-30
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

Influence of System Size Dependence of Energy Loss on Hadron Spectra Suppression

Corresponding author: WANG Xiao-Dong,

Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Received Date: 2006-09-30

Accepted Date: 1900-01-01

Available Online: 2007-06-05

Abstract: Based on parton model in QCD, at the leading-order approximation we studied the π⁰ spectra and nuclear modification factor R_AA in Au+Au and Cu+Cu collisions with different centralities. Because of parton jet energy loss in heavy ion collision, large transverse momentum hadrons spectra are suppressed as compared to p+p collisions at the same energy. It is shown that the suppression has strong dependence on the system size which determines the amount of the jet energy loss. The bigger the system is, the larger parton energy loss is. It results in the much more suppression of the spectra and also the much less R_AA.

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Influence of System Size Dependence of Energy Loss on Hadron Spectra Suppression

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