论文标题
$ b $箭头的可能解决方案$ππ$拼图z'型号
A possible solution of $B$ arrow $ππ$ puzzle in Z' model
论文作者
论文摘要
分支比和CP不对称的$ b $箭头$ππ$衰减的差异，例如$ b^0 $ b^0 $ arrow $π^+π^ - $ $ b^0 $ b^0 $ b^0 $ acrow $π^0π^0π^0π^0 $ b $ sarke $ b^0 $ b^0根据该$ B $箭头的图形方法，$ d $ d $过渡的颜色抑制幅度（C）与颜色允许的一个（t）相矛盾的标准模型（SM）方法与实验值之间的较小比率。为了说明歧义，我们需要用不同的拓扑幅度仔细检查衰减。在本文中，通过将C/T的不同值作为约束来研究SM中的衰减。我们发现，在SM中成功解释了C/T的较大比率，但较低的比率不需要新物理（NP）。 NP的贡献可以包含在$ b $箭头$ππ$腐烂的Z'Boson在树级。在这里，我们发现Z'模型可以通过为C/T较低比率提供良好的解决方案来解释难题。
The discrepancies among the measurements of branching ratios and CP asymmetries of $B$ arrow $ππ$ decays such as large direct CP asymmetry for $B^0 $ arrow $π^+ π^-$ mode and large branching ratio for $B^0$ arrow $π^0 π^0$ mode originate the $B$ arrow $ππ$ puzzle. According to diagrammatic approach of this $b$ arrow $d$ transition the small ratio of color-suppressed amplitude (C) to color-allowed one (T) contradicts between the standard model (SM) approach and the experimental values. To make out the ambiguity we need to scrutinize the decays with different topological amplitudes. In this paper, the decays are studied in the SM by taking different values of C/T as constraints. We find that larger ratio of C/T is explained successfully in the SM but the lower ratio is not for which new physics (NP) is needed. The NP contribution can be included in $B$ arrow $ππ$ decays at tree level by Z' boson. Here, we find that Z' model can explain the puzzle by providing a good solution for lower ratio of C/T.
