论文标题
谐振三体衰减的宽度效果：$ b $衰减为例
Width effects in resonant three-body decays: $B$ decay as an example
论文作者
论文摘要
对于具有较大宽度的中间共振介导的三体强体衰变，我们使用几个$ b $衰减作为明确的例子，以与相应的理论估计值正确提取准-two体衰减率。我们计算QCD分数方法中有限宽度效应的校正因子，并使用实验参数化进行比较，在这种参数化中，不存在动量依赖性的弱动力学。尽管张力和向量共振的差异通常小于$ 10 \％$，但标量共振的差异可能高达$（25-40）\％$。实际上，我们的发现可以应用于一般的准二体腐烂。
For three-body hadron decays mediated by intermediate resonances with large widths, we show how to properly extract the quasi-two-body decay rates for a meaningful comparison with the corresponding theoretical estimates, using several $B$ decays as explicit examples. We compute the correction factor from finite width effects in the QCD factorization approach, and make a comparison with that using the experimental parameterization in which the momentum dependence in the weak dynamics is absent. Although the difference is generally less than $10\%$ for tensor and vector resonances, it can be as large as $(25-40)\%$ for scalar resonances. Our finding can in fact be applied to general quasi-two-body decays.
