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本文以η→ππγ与η→3π的分支比为示例,讨论了通过对质量作解析延拓,用色散关系处理不稳定粒子衰变的方法,尤其是存在有反常阈的情形。在一定近似下,求得了分支比R((η→ππγ)/(η→3π))≈0.65,与最新实验结果相近。In this paper, the branch ratio of η→ππγ and η→3π is studied through the analytic continuation of a dispersive relation with respect to the mass of η. It is pointed out that the anomalous threshold and complex singularities are both present. Under appropriateapproximation, we obtain the branch ratio R ((η→ππγ)/(η→3π))≈0.65, which is close to recentexperimental results.
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