微扰QCD下B_(s)^(0)→π^(+)π^(-)K^(0)衰变过程直接CP破缺的研究

Study of Direct CP Violation for B_(s)^(0)→π^(+)π^(-)K^(0) Decay in Perturbative QCD

用微扰QCD的方法探究B_(s)^(0)→π^(+)π^(-)K^(0)三体衰变过程的CP破缺。在该过程中,首先考虑ρ-ω-φ共振效应的影响,在忽略高阶项的贡献后可得到其主要的衰变过程,进而可以写出该过程的振幅表达式,通过计算可得B_(s)^(0)→π^(+)π^(-)K^(0)三体衰变的CP破缺值可达到36%。

In this paper,we use the method of perturbative QCD to explore the three-body decay process,in which the effect of theρ-ω-φmixing effect is first considered.After removing the contribution of higher-order,we can obtain the main decay process.Then the amplitude expression of the process can be written.The CP violation of the three-body decay process can reach 36%by calculation.