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arXiv 1807.04558hep-exnucl-ex
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从ALICE研究Pb-Pb碰撞中两粒子数和横动量关联的近边峰的演化

The evolution of the near-side peak in two-particle number and transverse momentum correlations in Pb-Pb collisions from ALICE

Monika Varga-Kofarago

摘要:

两粒子数关联和横动量关联是研究重离子碰撞中产生的介质的有力工具。强子对角距的相关性可以提供介质输运特性的信息。特别地,横向动量相关性对动量流敏感,并且提供关于系统寿命、剪切粘度与熵密度比($η/s$)和系统弛豫时间($τ_π$)的信息。此外,在碰撞的初始阶段产生的射流的相互作用,可以研究使用数量的相关性,通过观察介质引起的修改的近侧射流峰值。测量这两套相关性从铅铅碰撞报告作为一个功能的中心性。理论解释和结果从蒙特卡罗发生器,然后面对的实验数据。

英文摘要:

Two-particle number and transverse momentum correlations are powerful tools for studying the medium produced in heavy-ion collisions. Correlations in the angular separation of pairs of hadrons can provide information on the medium transport characteristics. In particular, the transverse momentum correlations are sensitive to momentum currents, and provide information about the system life time, the shear viscosity over entropy density ratio ($η/s$) and the system relaxation time ($τ_π$). Furthermore, the interaction of the jets produced in the initial stages of a collision can be studied using number correlations, by observing the medium-induced modification of the near-side jet peak. Measurements of both sets of correlations from Pb-Pb collisions are reported as a function of centrality. Theoretical interpretations and results from Monte Carlo generators are then confronted with the experimental data.

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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