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arXiv 0907.1700nucl-th
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重离子碰撞中喷注远离侧双峰结构的起源探讨

Search For the Origin of the Away-side Double-humped Structure of jets in Heavy Ion Collisions

H. Zheng, L. L. Zhu, C. B. Yang

摘要:

本文建立了一个模型,解释了重离子碰撞中远侧双强子方位角关联中双峰结构的起源。模型中的参数是通过拟合STAR合作组给出的RHIC中心Au+Au碰撞的$Δϕ$方位角分布来确定的,其中触发动量为$3-4\rm {GeV/c}$,伴随粒子动量为$1.3-1.8\rm{GeV/c}$ .然后将我们的模型应用于RHIC的半中心和外围Au+Au碰撞,分别再现了相应的$\triangle ϕ$方位角分布。结果表明,横向流效应在实验观测到的双强子方位分布结构中起着至关重要的作用。对双峰结构来说,硬部分子产生点和初始运动方向的扩展也是必要的。

英文摘要:

A model is constructed for the origin of the double-humped structure found in the di-hahron azimuthal correlation on the away-side in heavy ion collisions. The parameters in the model are determined by fitting $Δϕ$ azimuthal distribution in central Au+Au collisions at RHIC given by STAR collaboration when the trigger momentum is in $3-4\rm {GeV/c}$ and the associated particle momentum is in $1.3-1.8\rm{GeV/c}$. Then we apply our model to the semi-central and peripheral Au+Au collisions at RHIC and the responding $\triangle ϕ$ azimuthal distribution are reproduced respectively. Our results show that the transverse flow effect plays an essential role in the experimentally observed di-hadron azimuthal distribution structure. The spread of the hard parton creation point and initial moving direction is also necessary for the double-humped structure.

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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