重新审视B_{s,d} -> pi pi，pi K，K K衰变
A Fresh Look at B_{s,d} -> pi pi, pi K, K K Decays
摘要：
利用更新的测量和SU（3）破缺的形状因子，我们详细地研究了B_d -> pi^+ pi^-，B_s -> K^+ K^-和B_d -> pi^ \mp K^ \pm，B_s -> pi^ \pm K^ \mp系统.相应的衰变通过强相互作用的U自旋对称性相互关联，并提供了幺正三角形的角γ的确定。在前一种情况下，我们得到gamma=（68.3^{+4.8}_{-5.7}^{+5.0}_{-3.7}）deg，这与么正三角形的标准模型拟合非常一致。第一个误差对应于实验输入的不确定性，而后者是一个估计的U-自旋破碎的影响。鉴于这一结果，在振幅水平上的大CP破坏新物理效应被排除。然而，该通道中的有效B_s -> K^+ K^-寿命和混合诱导的CP破坏为B^0_s- \bar B^0_s混合的新物理提供了有趣的探索。在B_d -> π^ \mp K^ \pm，B_s -> π ^ \pm K^ \mp系统的情况下，使用来自B^ \pm -> π^ \pm K的附加信息，我们获得γ \leq（71.8^{+5.4}_{-4.3}）度和范围24度\leq γ \leq 71度的界限。我们也进行测试的U-自旋对称性，并没有发现任何迹象表明大的不可因式分解的修正。
英文摘要：
Using updated measurements and SU(3)-breaking form factors, we have a detailed look at the B_d -> pi^+ pi^-, B_s -> K^+ K^- and B_d -> pi^\mp K^\pm, B_s -> pi^\pm K^\mp systems. The corresponding decays are related to each other by the U-spin symmetry of strong interactions and offer determinations of the angle gamma of the unitarity triangle. In the former case, we obtain gamma=(68.3^{+4.8}_{-5.7}^{+5.0}_{-3.7}) deg, which is in excellent agreement with the Standard-Model fits of the unitarity triangle. The first errors correspond to experimental input uncertainties, while the latter are an estimate of U-spin-breaking effects. In view of this result, large CP-violating new-physics effects at the amplitude level are excluded. However, the effective B_s -> K^+ K^- lifetime and the mixing-induced CP violation in this channel offer interesting probes for New Physics in B^0_s-\bar B^0_s mixing. In the case of the B_d -> π^\mp K^\pm, B_s -> pi^\pm K^\mp system, using additional information from B^\pm -> π^\pm K, we obtain a bound of gamma \leq (71.8^{+5.4}_{-4.3}) deg, and the range 24 deg \leq gamma \leq 71 deg. We perform also tests of the U-spin symmetry and do not find any indication for large non-factorizable corrections.
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