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arXiv 1407.8080nucl-thhep-ph
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热介质中的粲偶素:熔化与吸收

Charmonium in a hot medium: melting vs absorption

B. Z. Kopeliovich, I. K. Potashnikova, Ivan Schmidt, M. Siddikov

摘要:

在RHIC和LHC的重离子碰撞中产生的粲偶素通过具有相当高的相对动量(<p_T^2>=4- 10 GeV^2)的致密的同向运动物质传播。尽管结合势存在德拜屏蔽,但粲偶素仍以很大的概率存在,即使c-cbar势在热环境中被完全屏蔽。此外,与介质的颜色交换相互作用是粲偶氮抑制的另一个重要来源。在热介质中由这两种效应引起的衰减通过路径积分技术来评估,该技术需要将结合势提升到移动参考系的能力。这个问题在粲夸克的小内禀速度近似下得到了解决。

英文摘要:

A charmonium produced in heavy ion collisions at RHIC and LHC propagates through a dense co-moving matter with a rather high relative momentum, <p_T^2>=4-10GeV^2. In spite of Debye screening of the binding potential, the charmonium survives with a substantial probability, even if the c-cbar potential is completely screened in the hot environment. In addition, the color-exchange interaction with the medium is another important source of charmonium suppression. Attenuation in a hot medium caused by both effects is evaluated by means of the path integral technique, which requires ability of boosting the binding potential to a moving reference frame. This problem is solved in the approximation of small intrinsic velocities of the charmed quarks.

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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