In the paper two combinations of correlators are defined in order to investigate the evolution of possible $\mathcal{P/CP}$ invariance violation in strong interactions with initial energy for heavy ion collisions. These combinations correspond to absolute and relative asymmetry of distribution of electrically charge particles with respect to the reaction plane in heavy ion collisions. Energy dependence of the parameters was derived from data of STAR and ALICE experiments. Significant decreasing both absolute and relative asymmetry is observed at energies $\sqrt{s_{NN}} < 20$ GeV. This feature agrees qualitatively with other results of stage-I beam energy scan program in STAR experiment. General behavior of dependence of absolute asymmetry on initial energy agree reasonably with behavior of similar dependence of Chern -- Simons diffusion rate calculated at different values of external Abelian magnetic field. The observed behavior of understudying parameters vs energy can be considered as indication on possible transition to predominance of hadronic states over quark-gluon degrees of freedom in the mixed phase created in heavy ion collisions at intermediate energies.
Beam-helicity asymmetry measurements in the Virtual Compton Scattering reaction in the g*N-Delta transition at Q2=0.20 (GeV/c)^2
本文报道了在Delta（1232）$ resonance at Q2=0.20 (GeV/c)2. The measurements were performed at MAMI and were carried out simultaneously with the measurement of the H(\vec{e},e'p)π^0 reaction channel. It is the lowest Q2 for which the $中H（\vec{e}，e 'p）γ反应的束流螺旋度不对称性的新测量。测量的不对称性进行了比较，并已被发现是很好地描述的色散关系（DR）计算的色散。本文用DR方法研究了数据对质子的广义极化率（GPs）和核子激发到Delta（1232）的振幅的敏感性。测量的不对称性已被发现表现出更高的灵敏度的GP，而它是建议，未来的测量更高的统计精度将提供更强的约束理论计算，并将提供有价值的洞察力对更完整的理解的GP的质子和π-N振幅。
Beam asymmetry for pi+ and pi0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV
用CEBAF大接收谱仪（CLAS）和能量为1.102 - 1.862 GeV的线偏振光子束测量了γ p -> p π 0和γ p -> n π +反应的束流不对称性。本文介绍了一种从实验数据中提取光束非对称性的傅里叶矩技术。这里报道的结果具有更高的精度和更精细的能量分辨率比以前的测量。我们的两个π介子反应的数据似乎有利于SAID和Bonn-Gatchina散射分析的老美因茨MAID预测。在将目前的光束不对称性集合并入世界数据库之后，用SAID分析进行的探索性拟合表明，与先前拟合相比的最大变化是针对Delta（1700）3/2-和Delta（1905）5/2+状态的性质。
