标题： σ介子的复活 显示英文标题

标题： Resurrection of the Sigma Meson

摘要： 从一个非常一般的模型和对最轻的0++介子九重态的数据分析中可以看出，f0(980)和f0(1200)共振极点是同一ss态的两种表现形式。类似地，a0(980)和a0(1450)很可能是同一qq态的两种表现形式。另一方面，uu+dd态在单位化并受到强子质量位移强烈扭曲后，变成一个极其宽的布雷特-维igner类似背景，质量为860 MeV，宽度为880 MeV，其极点位于s=(0.158-i0.235) GeV^2。我们将这与自发破缺手征对称性模型所需的sigma介子联系起来。 显示英文摘要

摘要： It is shown from a very general model and an analysis of data on the lightest 0++ meson nonet that the f0(980) and f0(1200) resonance poles are two manifestations of the same ss state. Similarily the a0(980) and the a0(1450) are likely to be two manifestations of the same qq state. On the other hand, the uu+dd state, when unitarized and strongly distorted by hadronic mass shifts, becomes an extremely broad Breit-Wigner-like background, m=860 MeV, Gamma=880 MeV, with its pole at s=(0.158-i0.235) GeV^2. This we identify with the sigma meson required by models for spontaneous breaking of chiral symmetry.