【摘 要】
：
对f0(400-1200)的物理本质进行了探讨,将其分解为三部分:t道ρ介子和f2(1270)介子交换部分以及一个很宽的s道共振态f0(X).在ππ不变质量1.2GeV以下,用t道ρ介子交换就可以很
【机 构】
：
中国科学院高能物理研究所,中国科学院理论物理研究所
论文部分内容阅读
对f0(400-1200)的物理本质进行了探讨,将其分解为三部分:t道ρ介子和f2(1270)介子交换部分以及一个很宽的s道共振态f0(X).在ππ不变质量1.2GeV以下,用t道ρ介子交换就可以很好地解释同位旋为2的ππ S 波散射实验数据.但是,在能量高于1.2GeV时,t道f2(1270)介子交换的贡献必须计入.利用同位旋为2的ππ S波散射过程对t道ρ介子和f2(1270)介子交换中的形状因子进行约束,通过重新拟合CERN-Münich(CM)实验数据来获得f0(X)的参数.结果表明,确实需要引入一个在1.6-1.7GeV附近具有极点的较宽的0++的共振态,其极点是(1.69-0.26i)GeV.
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