Λ（1405）附近光生π π系统的同位旋分解
Isospin Decomposition of the Photoproduced Σπ System Near the Λ(1405)
摘要：
本文讨论了Jefferson实验室CLAS对γ+ p \to K^+ + π + π反应的最新实验结果。结果发现，三种电荷组合Σ^+ π^-、Σ ^0 π ^0和Σ^- π^+的质量分布或“线形”存在显着差异。结果表明，Λ（1405）作为反应的I=0组分，必然伴随着I > 0组分.我们讨论了唯象拟合的数据来测试这些振幅的可能形式和幅度。用布赖特-维格纳形式的双振幅I=0拟合单独的π^0通道，效果很好。增加一个I=1的振幅可以很好地同时模拟所有的线形。
英文摘要：
Recent experimental results for the reaction γ+ p \to K^+ + Σ+ π from CLAS at Jefferson Lab are discussed. It was found that the mass distributions or "line shapes" of the three charge combinations Σ^+ π^-, Σ^0 π^0 and Σ^- π^+ differ significantly. Our results show that the Λ(1405), as the I=0 constituent of the reaction, must be accompanied by an I > 0 component. We discuss phenomenological fits to the data to test the possible forms and magnitudes of these amplitudes. A two-amplitude I=0 fit of Breit-Wigner form to the Σ^0π^0 channel alone works quite well. The addition of a single I=1 amplitude works fairly well to model all the line shapes simultaneously.
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