Sophisticated calculations of the dynamics of relativistic heavy-ion collisions often need as input properties of light mesons in medium. In this context simple analytical expressions for these quantities which respect chiral symmetry and low-energy current algebra results are most desirable. In the present work we provide such simple expressions based on a bosonized version of the microscopic NJL model. We also study the pion lifetime in hot and dense matter showing that the ratio pi(pi(-) --> mu(-) + <(nu)over bar>(mu)/pi(pi(-) --> e(-) + <(nu)over bar>(e)) changes by a factor about three and thus carries a clear signature of the chiral phase transition. (C) 1997 Elsevier Science B.V. [References: 14]
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机译：相对论重离子碰撞动力学的复杂计算通常需要作为轻介子在介质中的输入特性。在这种情况下，最需要针对这些量的简单分析表达式，这些表达式涉及手性对称性和低能流代数结果。在当前的工作中，我们基于微观NJL模型的玻色版本提供了这样的简单表达式。我们还研究了在高温和稠密物质中的介子寿命，表明比率pi（pi（-）-> mu（-）+ <（nu over bar）>（mu）/ pi（pi（-）-> e （-）+ <（nu> bar>（e））变化大约三倍，因此带有明显的手性相变特征（C）1997 Elsevier Science BV [参考文献：14]
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