Two-particle interferometry for the sources undergoing a first-order QCD phase transition in high-energy heavy ion collisions

Two-particle interferometry for the sources undergoing a first-order QCD phase transition in high-energy heavy ion collisions
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高能重离子碰撞中经历一阶 QCD 相变源的双粒子干涉测量

DOI:
10.1103/physrevc.86.024914
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发表时间:
2012-05
期刊:
影响因子:
3.1
通讯作者:
Yu, Li-Li
Yu, Li-Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yin, Hong-Jie;Yang, Jing;Zhang, Wei-Ning;Yu, Li-Li

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研究了从具有有限重子化学势的夸克-胶子等离子体到强子共振气体的一阶相变的粒子发射源的双粒子干涉测量。研究了源扩展、寿命和粒子吸收对横向干涉半径${R}_{\ mathm {out}}$和${R}_{\ mathm {side}}$的影响。我们发现当系统初始位于混合相和夸克-胶子等离子体之间的边界时,粒子的发射持续时间变大。在这种情况下,半径${R}_{\mathrm{out}}$与半径${R}_{\mathrm{side}}$之间的差值随着粒子对横向动量的增加而显著增加。$\sqrt{{R}_{\mathrm{out}}^{2}\ensuremath{-}{R}_{\mathrm{side}}^{2}}$与这对的横向速度之比是可以观测到的,用于增强发射持续时间。
We investigate the two-particle interferometry for the particle-emitting sources that undergo the first-order phase transition from the quark-gluon plasma with a finite baryon chemical potential to hadron resonance gas. The effects of source expansion, lifetime, and particle absorption on the transverse interferometry radii ${R}_{\mathrm{out}}$ and ${R}_{\mathrm{side}}$ are examined. We find that the emission durations of the particles become large when the system is initially located at the boundary between the mixed phase and the quark-gluon plasma. In this case, the difference between the radii ${R}_{\mathrm{out}}$ and ${R}_{\mathrm{side}}$ increases with the transverse momentum of the particle pair significantly. The ratio of $\sqrt{{R}_{\mathrm{out}}^{2}\ensuremath{-}{R}_{\mathrm{side}}^{2}}$ to the transverse velocity of the pair is an observable for the enhancement of the emission duration.
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