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arXiv 0802.3618nucl-th
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$Λ$、K和$π$ HBT相关性的$m_T$标度的输运模型研究

Transport model study of the $m_T$-scaling for $Λ$, K, and $π$ HBT-correlations

Qingfeng Li, Marcus Bleicher, Horst Stoecker

摘要:

基于引入强子和弦自由度的微观输运模型UrQMD,研究了SPS和RHIC能区重离子碰撞中带电π介子、K介子和$Λ$源纵向同动系统的HBT参数.在级联模式中,$R_O$和高SPS和RHIC能量下的$R_L$不遵循$m_T$标度,然而,在考虑了形成重子的动量依赖的软状态方程(SM-EoS)和“预形成”粒子的密度依赖的Skyrme类势之后,π介子和K介子的HBT半径,甚至具有大横动量的$Λ$的HBT半径都很好地遵循$m_T$ -标度函数$R=3/\sqrt{m_T}$。

英文摘要:

Based on the microscopic transport model UrQMD in which hadronic and string degrees of freedom are employed, the HBT parameters in the longitudinal co-moving system are investigated for charged pion and kaon, and $Λ$ sources in heavy ion collisions (HICs) at SPS and RHIC energies. In the Cascade mode, $R_O$ and the $R_L$ at high SPS and RHIC energies do not follow the $m_T$-scaling, however, after considering a soft equation of state with momentum dependence (SM-EoS) for formed baryons and a density-dependent Skyrme-like potential for ``pre-formed'' particles, the HBT radii of pions and kaons and even those of $Λ$s with large transverse momenta follow the $m_T$-scaling function $R=3/\sqrt{m_T}$ fairly well.

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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