论文标题
quasi-two-body衰减$ b _ {（s）} \ to k^*γ\ tokπγ$在扰动QCD方法中
Quasi-two-body decays $B_{(s)}\to K^*γ\to Kπγ$ in perturbative QCD approach
论文作者
论文摘要
在这项工作中，我们研究了扰动QCD（PQCD）方法中的Quasi-Two-two衰变$ b \ to k^*γ\至kπγ$。引入了两膜分布幅度（DAS）来描述$kπ$对的最终状态相互作用，$kπ$对涉及时间样的形式因素和gegenbauer多项式。我们计算衰减$ b _ {（s）} \至k^*γ\至kπγ$的CP平均分支比率。我们的结果与Belle II测量的新更新数据一致，这表明这些准三体衰减比在三体框架中更合适地在三体框架中分析。我们还预测了被考虑的衰减模式的直接CP侵入不对称，并发现$ a_ {cp}（b_ {u，d} \至k^*γ\ to kistumtokπγ）$很小且小于$ 1 \％$ $，而$ a_ {cp}（cp}（cp}（b_ can} k {百分比。我们的预测可以通过未来的B梅森实验来测试。
In this work we study the quasi-two-body decays $B\to K^*γ\to Kπγ$ in the perturbative QCD (PQCD) approach. The two-meson distribution amplitudes (DAs) are introduced to describe the final state interactions of the $Kπ$ pair, which involve the time-like form factors and the Gegenbauer polynomials. We calculate the CP averaged branching ratios for the decays $B_{(s)}\to K^*γ\to Kπγ$. Our results are in agreement with the new update data measured by Belle II, which suggests these quasi-two-body decays are more appropriate to be analyzed in three-body framework than in the two-body one. We also predict the direct CP-violation asymmetries for the considered decay modes and find that $A_{CP}(B_{u,d}\to K^*γ\to Kπγ)$ is small and less than $1\%$ in magnitude, while $A_{CP}(B_{s}\to K^*γ\to Kπγ)$ is larger and can arrive at a few percent. Our predictions can be tested by the future B meson experiments.
