Flavor symmetry analysis of charmless B → VP decays
Flavor symmetry analysis of charmless B → VP decays
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DOI：
10.1088/1126-6708/2009/03/055
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发表时间：
2008-09
影响因子：
5.4
通讯作者：
C. Chiang;Yu-feng Zhou
中科院分区：
文献类型：
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作者：
C. Chiang;Yu-feng Zhou
基于风味SU(3)对称性，我们对无魅力B在最终状态下衰变为一个伪标量介子和一个矢量介子进行了全局拟合。我们考虑了不同的对称性破缺方案，并发现由朴素标度隐含的奇异性守恒和奇异性变化的振幅与适当的衰变常数的比值相关的方案比精确对称的情况稍微有利。我们拟合约束的统一三角形（UT）的(（rho) / bar, (eta) / bar）顶点在误差范围内与其他方法一致。我们发现，当旁观者夸克最终进入最终态矢量介子时，会出现较大的颜色抑制、电弱企鹅和单重态企鹅振幅。还需要非平凡的相对强相来解释数据。最佳拟合参数用于计算所有衰变模式下的分支比和CP不对称观测值，特别是在Tevatron和LHC实验中测量的B(s)衰变中。
Based upon flavor SU(3) symmetry, we perform global fits to charmless B decays into one pseudoscalar meson and one vector meson in the final state. We consider different symmetry breaking schemes and find that the one implied by naive scaling, where strangeness-conserving and strangeness-changing amplitudes are related by the ratio of appropriate decay constants, is slightly favored over the exact symmetry case. The ((rho) over bar, (eta) over bar) vertex of the unitarity triangle (UT) constrained by our fits is consistent with other methods within errors. We have found large color-suppressed, electroweak penguin and singlet penguin amplitudes when the spectator quark ends up in the final-state vector meson. Nontrivial relative strong phases are also required to explain the data. The best-fit parameters are used to compute branching ratio and CP asymmetry observables in all of the decay modes, particularly those in the B(s) decays to be measured at the Tevatron and LHC experiments.