多通道π π散射在底质衰变中的作用
Role of multichannel pi pi scattering in decays of bottomia
摘要：
在对U介子衰变数据的分析中，考虑了等腰S波多道π π-> π π，K反K，η η散射的影响.我们发现，在我们的模型无关方法中，当考虑末态相互作用对衰变Upperdom（mS）-> Upperdom（nS）pi pi（m>n，m= 2，3，n= 1，2）的贡献时，我们可以解释这些Upperdom跃迁的两π能谱，包括Upperdom（3S）-> Upperdom（1 S）pi pi中的双峰形状的双π质量分布作为耦合沟道效应。它还表明，所考虑的bottomia衰变数据不提供新的见解的f0介子的性质，这是不是已经推导出在我们以前的分析赝标介子散射数据。
英文摘要：
The effect of isoscalar S-wave multichannel pi pi -> pi pi, K antiK, eta eta scattering is considered in the analysis of decay data of the Upsilon-mesons. We show that when allowing for the final state interaction contribution to the decays Upsilon(mS) -> Upsilon(nS) pi pi (m>n, m=2,3, n=1,2) in our model-independent approach, we can explain the two-pion energetic spectra of these Upsilon transitions including the two-humped shape of the di-pion mass distribution in Upsilon(3S) -> Upsilon(1S) pi pi as the coupled-channel effect. It is shown also that the considered bottomia decay data do not offer new insights into the nature of the f0 mesons, which were not already deduced in our previous analyses of pseudoscalar meson scattering data.
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