Imaging of granular sources in high energy heavy ion collisions

Imaging of granular sources in high energy heavy ion collisions
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高能重离子碰撞中颗粒源的成像

DOI:
10.1088/0954-3899/36/1/015113
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发表时间:
2008-08
期刊:
J. Phys. G: Nucl. Part. Phys.
影响因子:
--
通讯作者:
Zhi-Tao Yang
Zhi-Tao Yang
中科院分区:
其他
文献类型:
--
作者:
Wei-Ning Zhang;Yan-Yu Ren;Zhi-Tao Yang

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我们研究了高能重离子碰撞中的粒子源模型的源成像。粒子源的两π子源函数呈现出两层结构。利用粒子源函数的参数化公式,我们研究了交替梯度同步加速器(AGS)和相对论重离子对撞机(RHIC)上Au+Au碰撞成像数据的源函数的两层结构。我们发现Brown和Danielewicz介绍的成像技术适用于探测震源的颗粒结构。我们的数据拟合结果表明,在AGS能区没有可见的源的粒度。然而,40<中心性<90%和0.20<kt<0.36GeV/c的RHIC碰撞数据用颗粒发射模型比单高斯模型能更好地描述。与简单的高斯模型相比,颗粒源模型具有更多的参数,因此可以描述更复杂的形状。
We investigate the source imaging for a granular pion-emitting source model in high energy heavy ion collisions. The two-pion source functions of the granular sources exhibit a two-tiered structure. Using a parametrized formula of a granular two-pion source function, we examine the two-tiered structure of the source functions for the imaging data of Au+Au collisions at the Alternating Gradient Synchrotron (AGS) and the Relativistic Heavy Ion Collider (RHIC). We find that the imaging technique introduced by Brown and Danielewicz is suitable for probing the granular structure of the sources. Our data-fitting results indicate that there is no visible granularity for the sources at AGS energies. However, the data for the RHIC collisions with the selections of 40 < centrality < 90% and 0.20 < kT < 0.36 GeV/c are better described by the model with granular emission than that of one Gaussian. The model with a granular source has more parameters than the simple Gaussian, hence can describe more complicated shapes.
DOI: 10.1016/j.nuclphysa.2004.12.050
发表时间: 2005-03
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影响因子: --
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