Remarks on the U(1) axial symmetry and the chiral transition in QCD at finite temperature

被引：19

作者：

Meggiolaro, Enrico ^{[1
,2
]}

Morda, Alessandro ^{[3
,4
,5
]}

机构：

[1] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy

[2] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[3] Aix Marseille Univ, CNRS, CPPM, IN2P3, F-13288 Marseille, France

[4] Aix Marseille Univ, CPT, F-13288 Marseille, France

[5] Univ Sud Toulon Var, CNRS, UMR 7332, F-13288 Marseille, France

来源：

PHYSICAL REVIEW D | 2013年 / 88卷 / 09期

关键词：

LATTICE QCD; PHASE-TRANSITION; CURRENT-ALGEBRA; SPECTRUM; BREAKING;

D O I：

10.1103/PhysRevD.88.096010

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss the role of the U(1) axial symmetry for the scalar and pseudoscalar meson mass spectrum of QCD at finite temperature, above the chiral transition at T-c, using a chiral effective Lagrangian model, which, in addition to the usual chiral condensate <(q) over barq >, also includes a (possible) genuine U(1)(A)-breaking condensate that (possibly) survives across the chiral transition. The motivations for considering this Lagrangian (and a critical comparison with other effective Lagrangian models existing in the literature) are presented. A detailed comparison between the case N-f >= 3 and the (remarkably different) case N-f = 2 is performed. The results obtained in the case N-f = 2 are also critically compared with the available lattice results.

引用

页数：13

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