相对论重离子对撞机上的π介子干涉学：探测热化的夸克-胶子等离子体？

Pion interferometry at RHIC: porobing a thermalized quark-gluon plasma?

作者信息

Soff S, Bass S A, Dumitru A

机构信息

Physics Department, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973, USA.

出版信息

Phys Rev Lett. 2001 Apr 30;86(18):3981-4. doi: 10.1103/PhysRevLett.86.3981.

DOI:10.1103/PhysRevLett.86.3981

PMID:11328075

Abstract

We calculate the Gaussian radius parameters of the pion-emitting source in high-energy heavy-ion collisions, assuming a first-order phase transition from a thermalized quark-gluon plasma (QGP) to a gas of hadrons. Such a model leads to a very long-lived dissipative hadronic rescattering phase which dominates the properties of the two-pion correlation functions. The radii are found to depend only weakly on the thermalization time tau(i), the critical temperature Tc (and thus the latent heat), and the specific entropy of the QGP. The model calculations suggest a rapid increase of R(out)/R(side) as a function of KT if a thermalized QGP were formed.

摘要

我们计算了高能重离子碰撞中π介子发射源的高斯半径参数，假设存在从热化夸克胶子等离子体（QGP）到强子气体的一级相变。这样一个模型导致了一个寿命非常长的耗散强子再散射阶段，它主导了双π介子关联函数的性质。我们发现半径仅微弱地依赖于热化时间τ(i)、临界温度Tc（以及因此的潜热）和QGP的比熵。模型计算表明，如果形成了热化的QGP，R(out)/R(side)会作为KT的函数迅速增加。