作为Reggeons的夸克-胶子等离子体袋
Quark Gluon Plasma Bags as Reggeons
摘要：
在一个精确可解的模型下，讨论了介质依赖的有限宽度的夸克-胶子等离子体（QGP）袋对其状态方程的影响。结果表明，QGP袋的大宽度不仅解释了观测到的强子共振数的不足，而且阐明了为什么不能直接观测到重QGP袋作为强子相的亚稳态的原因.我展示了如何模型允许一个估计的最小值的宽度QGP袋重2.5 GeV的各种格点量子色动力学的数据，并得到最小的共振宽度在零温度约600兆电子伏。在真空和强相互作用介质中建立了大而重的QGP袋的Regge轨迹。结果表明，在高温下，QGP袋的平均质量和平均宽度符合Regge轨线渐近的上界（线性渐近），而在低温下（低于Hagedorn温度T_H的一半[1]），它们符合Regge轨线渐近的下界（平方根1）。因此，当温度低于T_H/2时，QGP袋的自旋从上面受到限制，而当温度高于T_H/2时，这些袋表现出与弦模型一致的典型Regge行为。
英文摘要：
Within an exactly solvable model I discuss the influence of the medium dependent finite width of quark gluon plasma (QGP) bags on their equation of state. It is shown that the large width of the QGP bags not only explains the observed deficit in the number of hadronic resonances, but also clarifies the reason why the heavy QGP bags cannot be directly observed as metastable states in a hadronic phase. I show how the model allows one to estimate the minimal value of the width of QGP bags being heavier than 2.5 GeV from a variety of the lattice QCD data and to get the minimal resonance width at zero temperature of about 600 MeV. The Regge trajectories of large and heavy QGP bags are established both in a vacuum and in a strongly interacting medium. It is shown that at high temperatures the average mass and width of the QGP bags behave in accordance with the upper bound of the Regge trajectory asymptotics (the linear asymptotics), whereas at low temperatures (below a half of the Hagedorn temperature T_H [1] they obey the lower bound of the Regge trajectory asymptotics (the square root one). Thus, for temperatures below T_H/2 the spin of the QGP bags is restricted from above, whereas for temperatures above T_H/2 these bags demonstrate the typical Regge behavior consistent with the string models.
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