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arXiv 1001.0670nucl-thhep-ph
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E_{lab} = 2- 160 GeV/nucleon重离子碰撞中的重子停止

Baryon Stopping in Heavy-Ion Collisions at E_{lab}= 2--160 GeV/nucleon

Yu. B. Ivanov

摘要:

有人认为,实验观察到的重子停止可能表明(在目前的实验不确定性)作为碰撞核的入射能量的函数的非单调行为。这可以通过净质子快度谱的中快度减少曲率来量化。上述非单调行为揭示了其本身作为该曲率的激励函数中的“之字形”不规则性。强子状态方程的三流体动力学计算不能再现这种不规则性。与此同时,对包含一阶相变到夸克-胶子相的EoS的相同计算确实再现了这种“之字形”行为,但只是定性的。

英文摘要:

It is argued that the experimentally observed baryon stopping may indicate (within the present experimental uncertainties) a non-monotonous behaviour as a function of the incident energy of colliding nuclei. This can be quantified by a midrapidity reduced curvature of the net-proton rapidity spectrum. The above non-monotonous behaviour reveals itself as a "zig-zag" irregularity in the excitation function of this curvature. The three-fluid dynamic calculations with a hadronic equation of state (EoS) fail to reproduce this irregularity. At the same time, the same calculations with an EoS involving a first-order phase transition into the quark-gluon phase do reproduce this "zig-zag" behaviour, however only qualitatively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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