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arXiv 1102.2908nucl-thhep-ph
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手性缩合物与化学冻出

Chiral condensate and chemical freeze-out

D. B. Blaschke, J. Berdermann, J. Cleymans, K. Redlich

摘要:

我们考虑一个化学冻结机制,这是基于强介质依赖性的非弹性味平衡碰撞的基础上的强子波函数的离域和增长的强子半径接近手征恢复的速率。我们研究了介子(π介子)和重子(核子)涨落在(T,μ)平面相图中对手征凝聚体熔化的作用。我们应用PNJL模型超出平均场,并提出了一个有效的推广手征微扰理论的结果,占介质依赖的π衰变常数,同时保持GMOR关系。我们证明在一个示意性的共振气体模型组成的一个可变数量的介子和核子自由度,在上述模型的定量解释的强子冻结曲线和它的唯象条件可以给出。

英文摘要:

We consider a chemical freeze-out mechanism which is based on a strong medium dependence of the rates for inelastic flavor-equilibrating collisions based on the delocalization of hadronic wave functions and growing hadronic radii when approaching the chiral restoration. We investigate the role of mesonic (pion) and baryonic (nucleon) fluctuations for melting the chiral condensate in the phase diagram in the (T,mu)-plane. We apply the PNJL model beyond mean-field and present an effective generalization of the chiral perturbation theory result which accounts for the medium dependence of the pion decay constant while preserving the GMOR relation. We demonstrate within a schematic resonance gas model consisting of a variable number of pionic and nucleonic degrees of freedom that within the above model a quantitative explanation of the hadonic freeze-out curve and its phenomenological conditions can be given.

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