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arXiv 0907.1392nucl-th
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部分热化对HBT干涉测量的影响

Effects of partial thermalization on HBT interferometry

Clément Gombeaud, Tuomas Lappi, Jean-Yves Ollitrault

摘要:

流体动力学模型通常不能描述RHIC上测得的干涉半径。为了研究这一"HBT难题“,我们在二维输运模型下对超相对论重离子碰撞中的HBT半径进行了系统的研究。我们计算的横向半径$R_o$和$R_s$的$p_t$的函数的努森数,这措施的热化程度的系统。对于现实的克努森数估计$v_2$数据的值,我们得到$R_o/R_s \simeq 1.2$,更接近数据比标准的流体动力学结果。飞秒观测值随热化程度的变化很小。非中心碰撞中半径的方位角振荡不能很好地探测热化。

英文摘要:

Hydrodynamical models have generally failed to describe interferometry radii measured at RHIC. In order to investigate this ``HBT puzzle'', we carry out a systematic study of HBT radii in ultrarelativistic heavy-ion collisions within a two-dimensional transport model. We compute the transverse radii $R_o$ and $R_s$ as functions of $p_t$ for various values of the Knudsen number, which measures the degree of thermalization in the system. For realistic values of the Knudsen number estimated from $v_2$ data, we obtain $R_o/R_s \simeq 1.2$, much closer to data than standard hydrodynamical results. Femtoscopic observables vary little with the degree of thermalization. Azimuthal oscillations of the radii in non central collisions do not provide a good probe of thermalization.

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