标题： 观察动态QCD弦 显示英文标题

标题： Observation of a dynamical QCD string

摘要： 由不包含狄拉克算子最低本征态的夸克传播子构成的介子不仅显示出恢复的SU(2)_L * SU(2)_R手征对称性和U(1)_A对称性，而且实际上具有更高的对称性。 对于相同自旋状态的所有可能的手征和U(1)_A多重态是简并的，即观察到的量子能级的能量不依赖于系统中夸克的自旋取向及其宇称。 能量水平的夸克自旋独立性意味着系统中不存在磁相互作用。 仅包含色电相互作用的极端相对论夸克-反夸克系统可以被解释（或定义）为一种动力学QCD弦。 显示英文摘要

摘要： Mesons constructed from the quark propagators without the lowest-lying eigenmodes of the Dirac operator reveal not only restored SU(2)_L * SU(2)_R chiral and U(1)_A symmetries, but actually a higher symmetry. All possible chiral and U(1)_A multiplets for the states of the same spin are degenerate, i.e., the energy of the observed quantum levels does not depend on the spin orientation of quarks in the system and their parities. The quark-spin independence of the energy levels implies absence of the magnetic interactions in the system. The ultrarelativistic quark-antiquark system with only the color-electric interactions can be interpreted (or defined) as a dynamical QCD string.