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arXiv 1906.09754nucl-thhep-ph
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有限尺寸硬粒子与流体动力源的HBT干涉测量

Finite size of hardons and HBT interferometry for hydrodynamic sources

Yong Zhang, Hong-Jie Yin, Weihua Wu

摘要:

在重离子碰撞中形成的强子不是点状物体,它们不能占据太近的时空点。当两个玻色子靠得太近时,它们的组分开始混合,它们不能被认为是服从玻色-爱因斯坦统计的玻色子,这种效应被称为排斥体积效应。本文研究了不同尺寸源的HBT体积效应。对HBT的影响表现在外、侧、长三个方向上,且对时空分布较窄的源的影响更为明显。高横动量的关联函数受体积效应的抑制更大。因此,在小碰撞系统中,高横动量的体积效应可以更好地抑制非相干参数。

英文摘要:

Hadrons formed in heavy-ion collisions are not point-like objects, they cannot occupy too close space-time points. When the two bosons are too close to each other, their constituents start to mix and they cannot be considered as bosons subjected to Bose-Einstein statistics, this effect is called excluded volume effect. We study the volume effect on HBT for the sources with various sizes. The effect on HBT was shown in out, side and long directions, and it is more obvious for the source with a narrow space-time distribution. The correlation functions for high transverse momenta are more suppressed by the volume effect. Hence the incoherence parameter may be more suppressed by the volume effect for high transverse momenta in small collision systems.

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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