Contributions of qqqqq Components to Axial Charges of Proton and N(1440)

• 来源期刊: 理论物理通讯(英文版)
• 学科: 物理学
• 关键词: 轴向 质子 收费 组件框架 成分 组分夸克模型 螺旋度振幅 对称破缺
• 年，卷（期）: 2010,（10）
• 页码范围: 697-700
• 页数: 4页
• 分类号: O572.341 TH131.3
• 语种: 英文

摘要

The axial charges of the proton and N(1440) are studied in the framework of an extended constituent quark model (CQM) including qqqqq components. The cancellation between the contributions of qqq components and qqqqq components gives a natural explanation to the experimental value of the proton axial charge, which can not be well reproduced in the traditional CQM even after the SU(6) * O(3) symmetry breaking is taken into account. The experimental value of axial charge pins down the proportion of the qqqqq component in the proton to about 20%, which is consistent with the ones given by the strong decay widths and helicity amplitudes. Besides, an axial charge for N(1440) about 1 is predicted with 30%qqqqq component, which is obtained by the strong and electromagnetic decays.