An effective QCD Lagrangian in the presence of an axial chemical potential

被引：47
作者：
Andrianov, A. A. [1 ,2 ,3 ]
Espriu, D. [2 ,3 ]
Planells, X. [2 ,3 ]
机构：
[1] St Petersburg State Univ, VA Fock Dept Theoret Phys, St Petersburg 198504, Russia
[2] Univ Barcelona, Dept Estruct & Constituents Mat, E-08028 Barcelona, Spain
[3] Univ Barcelona, Inst Ciencies Cosmos ICCUB, E-08028 Barcelona, Spain
来源：
EUROPEAN PHYSICAL JOURNAL C | 2013年 / 73卷 / 01期
关键词：
MASS INEQUALITIES; PARITY VIOLATION; P-VIOLATION;
D O I：
10.1140/epjc/s10052-013-2294-0
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We consider the low energy realization of QCD in terms of mesons when an axial chemical potential is present; a situation that may be relevant in heavy ion collisions. We shall demonstrate that the presence of an axial charge has profound consequences on meson physics. The most notorious effect is the appearance of an explicit source of parity breaking. The eigenstates of strong interactions do not have a definite parity and interactions that would otherwise be forbidden compete with the familiar ones. In this work we focus on scalars and pseudoscalars that are described by a generalized linear sigma model. We comment briefly on the screening role of axial vectors in formation of effective axial charge and on the possible experimental relevance of our results, whose consequences may have been already seen at RHIC.
引用
收藏
页码：1 / 10
页数：10
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