论文标题
四体衰减的研究$ b^{0} _ {s} \ rightarrowπππ$在扰动QCD方法中
Study of the four-body decays $B^{0}_{S} \rightarrow ππππ$ in the perturbative QCD approach
论文作者
论文摘要
在这项工作中，我们分析了四体衰变的CP平均分支比和直接CP侵入不对称的b_ {s} \ rightArrowππππdecay，从s-wave共振，f_ {0}（980）和f_ {0}（500）和p-wave（500）和p-wave（500）和p-wave cosonances，p-wave（500}（980）（980）和p-wave（77）。扰动QCD方法框架内的πdistribution幅度。 We also calculate branching ratios of the two-body decays B^{0}_{S}\rightarrowρ^{0}ρ^{0}, B^{0}_{S}\rightarrowρ^{+}ρ^{-} from the corresponding quasi-two-body decays models and compare our results with those obtained in previous perturbative QCD方法，QCD分解方法和脂肪方法，发现预测与错误中的当前数据一致。我们对四体衰变计算的分支比率B_ {s} \ rightArrowππππare在10^{ - 7}的顺序处。对于CP侵略不对称，我们发现当CP侵入不对称性可以通过ρ-ωMIXING共共振质量在ω谐振附近时可以增强。
In this work, we analyse the CP-averaged branching ratios and direct CP-violating asymmetries of the four-body decays B_{S} \rightarrow ππππdecay from the S-wave resonances, f_{0}(980) and f_{0}(500) and P-wave resonances, ρ(770) by introducing the S-wave and P-wave ππdistribution amplitudes within the framework of the perturbative QCD approach. We also calculate branching ratios of the two-body decays B^{0}_{S}\rightarrowρ^{0}ρ^{0}, B^{0}_{S}\rightarrowρ^{+}ρ^{-} from the corresponding quasi-two-body decays models and compare our results with those obtained in previous perturbative QCD approach, QCD factorization approach and FAT approach, it is found that the predictions are consistent with present data within errors. The branching ratios of our calculations for the four-body decays B_{S}\rightarrow ππππare at the order of the 10^{-7}. For the CP-violating asymmetries, we found that CP-violating asymmetry can be enhanced largely by the ρ-ωmixing resonances when ππpairs masses are in the vicinity of ωresonance.
