Baryon-antibaryon production asymmetry in relativistic heavy ion collisions
Baryon-antibaryon production asymmetry in relativistic heavy ion collisions
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DOI：
10.1103/physrevc.88.027901
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发表时间：
2013-03
影响因子：
3.1
通讯作者：
Jun Song;Feng-lan Shao
中科院分区：
文献类型：
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作者：
Jun Song;Feng-lan Shao
RHIC和SPS能区的实验数据表明，产额比$p/p$和$K^{-}/K^{+}$之间存在系统的相关性，揭示了相对论重离子碰撞中强子产生的普遍性.我们提出了一个基于夸克组合机制的解释，其中特别关注了重子和反重子之间的产生不对称性。本文从夸克组合的基本思想出发，对重子和介子的整体产生的性质进行了一般性的分析，得到了强子化前重子、反重子和介子的产额随组成夸克和反夸克个数的变化关系。特别地，我们研究了夸克-反夸克不对称性对（反）重子与介子之比和反重子与重子之比的影响。我们用这些公式很好地解释了不同碰撞能量和快度下的$\bar{p}/p$和$K^{-}/K^{+}$数据，并建议在中等RHIC能量的中快度区进一步测量，以决定性地检验这种普适性。
Experimental data at RHIC and SPS energies suggest a systematic correlation between yield ratio $\bar{p}/p$ and $K^{-}/K^{+}$, which reveal some universality of hadron production in relativistic heavy ion collisions. We propose an explanation based on the quark combination mechanism in which the production asymmetry between baryons and antibaryons is focused on especially. We start from the basic ideas of quark combination to carry out a general analysis of the properties of the global production of baryons and mesons and obtain the yields of baryons, antibaryons and mesons as functions of the number of constituent quarks and antiquarks just before hadronization. In particular, we study effects of quark-antiquark asymmetry on the ratio of (anti-)baryons to mesons and that of antibaryons to baryons. We use these formula to well explain the data of $\bar{p}/p$ and $K^{-}/K^{+}$ at different of collision energies and rapidities and suggest further measurements at moderate RHIC energies in the mid-forward rapidity regions to make the decisive test of this universality.