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arXiv 0912.3457nucl-thhep-ph
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超相对论重离子碰撞中π介子干涉尺度的能量依赖性

Energy dependence of pion interferometry scales in ultra-relativistic heavy ion collisions

Iu. A. Karpenko, Yu. M. Sinyukov

摘要:

在流体动力学方法的范围内,对顶部SPS、RHIC和LHC能量的π介子谱和干涉尺度的能量行为进行了研究。后者允许人们描述夸克胶子和强子物质的演化,以及与基本动力学方程一致的流体中的连续粒子发射。的主要机制,导致矛盾的,乍一看,行为的干涉尺度,暴露。特别是,由于在系统径向外围发射的π子的空间和时间位置之间的正相关性的加强,随着能量的增长,$R_{out}/R_{side}$比缓慢下降并明显饱和。这种增强效应是火球中热前横向集体流发展和初始能量密度增加的结果。

英文摘要:

A study of energy behavior of the pion spectra and interferometry scales is carried out for the top SPS, RHIC and LHC energies within the hydrokinetic approach. The latter allows one to describe evolution of quark-gluon and hadron matter as well as continuous particle emission from the fluid in agreement with the underlying kinetic equations. The main mechanisms that lead to the paradoxical, at first sight, behavior of the interferometry scales, are exposed. In particular, a slow decrease and apparent saturation of $R_{out}/R_{side}$ ratio with an energy growth happens due to a strengthening of positive correlations between space and time positions of pions emitted at the radial periphery of the system. Such en effect is a consequence of a developing of the pre-thermal collective transverse flows and an increase of the initial energy density in the fireball.

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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