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arXiv 1012.5046hep-phhep-exhep-latnucl-th
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介子的手征和angular momentum含量

Chiral and angular momentum content of mesons

L. Ya. Glozman

摘要:

首先,我们综述了激发态强子中有效手征恢复的研究现状,以及对高激发态强子中所观察到的对称性的另一种解释。然后我们讨论了如何定义和测量的方法在不同的分辨率尺度,包括红外尺度,质量产生的介子的手征和角动量的内容,在规范不变的方式。我们说明了这种方法,提出的手征和角动量含量的ρ和ρ '介子的动力学晶格模拟的结果。rho(770)的手征对称性被强烈破缺,a_1(1260)和h_1(1170)都不能被认为是它的手征伙伴。它的角动量含量在红外近似为3S 1分波,与夸克模型的语言一致。然而,在其第一次激发rho(1450)中,手征对称性破缺要弱得多,并且在红外线中,该状态主要属于(1/2,1/2)手征表示。与夸克模型相反,这种状态在红外线中由3D 1分波支配,不能被认为是ρ(770)介子的第一径向激发。

英文摘要:

First, we overview the present status of the effective chiral restoration in excited hadrons and an alternative explanation of the symmetry observed in the highly excited hadrons. Then we discuss a method how to define and measure in a gauge invariant manner the chiral and angular momentum content of mesons at different resolution scales, including the infrared scale, where mass is generated. We illustrate this method by presenting results on chiral and angular momentum content of rho and rho' mesons obtained in dynamical lattice simulations. The chiral symmetry is strongly broken in the rho(770) and neither the a_1(1260) nor the h_1(1170) can be considered as its chiral partners. Its angular momentum content in the infrared is approximately the 3S1 partial wave, in agreement with the quark model language. However, in its first excitation, rho(1450), the chiral symmetry breaking is much weaker and in the infrared this state belongs predominantly to the (1/2,1/2) chiral representation. This state is dominated in the infrared by the 3D1 partial wave and cannot be considered as the first radial excitation of the rho(770)-meson, in contrast to the quark model.

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