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arXiv 1505.00540hep-phhep-lat
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用T矩阵方法研究夸克-胶子等离子体的热力学

Thermodynamics of the Quark-Gluon Plasma within a T-matrix approach

Gwendolyn Lacroix, Claude Semay, Fabien Buisseret

备注：
arXiv admin note: text overlap with arXiv:1408.0958
发表信息：
Phys. Rev. C 91, 065204 (2015)
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摘要：

本文采用$T$矩阵公式研究了夸克-胶子等离子体（QGP）的强耦合相，其中介质被视为准粒子（夸克、反夸克和胶子）非微扰相互作用的非理想气体。在所研究的温度范围内，（1 - 5）$T_c$，其中$T_c$是解除禁闭的温度，预期相互作用足够强以产生束缚态。这样的二元束缚态的解离温度计算在这里。双星系统中的准粒子越重，束缚态越有可能在$T_c$之上存活。然后，利用统计力学的Dashen，Ma和Bernstein公式，计算了$N_f = 2$和$N_f = 2 + 1$在零势和小重子势下的QGP状态方程。与当前的格点量子色动力学数据的比较。

英文摘要：

The strongly-coupled phase of the quark-gluon plasma (QGP) is studied here by resorting to a $T$-matrix formulation in which the medium is seen as a non-ideal gas of quasiparticles (quarks, antiquarks and gluons) interacting nonpertubatively. In the temperature range under study, (1-5) $T_c$, where $T_c$ is the temperature of deconfinement, the interactions are expected to be strong enough to generate bound states. The dissociation temperature of such binary bound states is thus computed here. The more the quasiparticles involved in the binary system are heavy, the more the bound state is likely to survive significantly above $T_c$. Then, the QGP equations of state at zero and small baryonic potential are computed for $N_f = 2$ and $N_f = 2 + 1$ by resorting to the Dashen, Ma and Bernstein formulation of statistical mechanics. Comparisons with current lattice QCD data are presented.

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