强子物质的手征不平衡：光子极化不对称性的表现
Chiral imbalance in hadron matter : its manifestation in photon polarization asymmetries
摘要：
本文研究了在夸克-强子介质中由于手征对称性破缺，即重离子碰撞（HIC）后火球中左右手夸克平均密度出现差异，而导致局部宇称破缺（LPB）的可能性.将QCD激发的有效介子拉格朗日量推广到手征介质，分析了轻标量和赝标量介子的性质。研究表明，标量介子的奇异衰变是由于手征不平衡下$π$和$a_0$真空态的混合引起的。π电磁形状因子获得奇偶奇补充，其产生π极化率中的光子极化不对称性。我们推测LPB的上述性质可以在LHC、RHIC、FAIR和NICA加速器上的实验中得到证实。
英文摘要：
The possibility of the formation of a local parity breaking (LPB) in a quark-hadron medium is examined as a result of chiral symmetry violation, i.e, the appearance of difference between the average densities of right- and left-handed quarks in the fireball after heavy-ion collisions (HIC). Using the effective meson Lagrangian motivated by QCD extended to the chiral medium the properties of light scalar and pseudoscalar mesons are analyzed. It is establish that exotic decays of scalar mesons arise due to mixing of $π$ and $a_0$ vacuum states in the presence of chiral imbalance. The pion electromagnetic formfactor obtains a parity-odd supplement which generates a photon polarization asymmetry in pion polarizability. We conjecture that the above-mentioned properties of LPB can be revealed in experiments on LHC, RHIC, FAIR and NICA accelerators.
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