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K介子协变动力学及其准粒子模型的性质
Covariant Kaon Dynamics and Properties of Quasi-particle Models
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摘要: 简要综述了中高能重离子碰撞中K介子的产生及研究进展。重点介绍了K介子协变动力学模型,并在此框架内分析了中高能重离子碰撞中K＋介子以及与其伴随产生的Λ超子的集体流特征。结果表明：协变动力学模型能够很好地给出K＋介子和Λ超子的微分直接流。相对而言,软势给出的集体流与实验值符合更好。同时,通过对不同输运模型中K介子准粒子模型的基本属性进行对比分析,明确了协变动力学模型中K介子准粒子模型的质量及能量随核物质密度的变化特征,以及周围核子的运动对于K介子基本属性的影响。Abstract: In the present paper,we briefly review the progress in the study of kaon production in heavy-ion collisions at intermediate and high energies and introduce the covariant kaon dynamics model.The collective flows of positively charged kaon and the lambda hyperon associated produced with kaon are studied in the framework of the dynamics.It shows that the directed differential flow of K＋ meson and Λ hyperon can be reasonably reproduced in the covariant kaon dynamics model.The calculated results with soft equation of nuclear matter are in better agrement with experimental data.Meawhile,a detailed comparison of the properites of different quasi-particle models in various transport model and the influence of nucleon＇s movement on the effective mass and energy of the quasi-particle in the covariant kaon dynamics model are discussed.
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