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arXiv · 0706.3820

Transverse momentum and pseudorapidity dependences of $'\bm{Mach-like}'$ correlations for central Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

S. Zhang·G. L. Ma·Y. G. Ma·X. Z. Cai·J. H. Chen·H. Z. Huang·W. Q. Shen·X. H. Shi·F. Jin·J. Tian·C. Zhong·J. X. Zuo
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Abstract

The transverse momentum and pseudorapidity dependences of partonic {`\it{Mach-like}'} shock wave have been studied by using a multi-phase transport model (AMPT) with both partonic and hadronic interactions. The splitting parameter $D$, i.e. half distance between two splitting peaks on away side in di-hadron azimuthal angular ($Δϕ$) correlations, slightly increases with the transverse momentum of associated hadrons ($p^{assoc}_T$), which is consistent with preliminary experimental trend, owing to different interaction-lengths/numbers between wave partons and medium in strong parton cascade. On the other hand, the splitting parameter $D$ as a function of pseudorapidity of associated hadrons ($η^{assoc}$), keeps flat in mid-pseudorapidity region and rapidly drops in high-pseudorapidity region, which is as a result of different violent degrees of jet-medium interactions in the medium that has different energy densities in the longitudinal direction. It is proposed that the research on the properties of {`\it{Mach-like}'} correlation can shed light on the knowledge of both partonic and hadronic interactions at RHIC.

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S. Zhang, G. L. Ma, Y. G. Ma, X. Z. Cai, J. H. Chen, H. Z. Huang, W. Q. Shen, X. H. Shi, F. Jin, J. Tian, C. Zhong, J. X. Zuo. 2007-06-26. Transverse momentum and pseudorapidity dependences of $'\bm{Mach-like}'$ correlations for central Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. https://doi.org/10.1103/physrevc.76.014904

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