Decays of B meson to two charmed mesons
Decays of B meson to two charmed mesons
复制标题
B介子衰变成两个粲介子
DOI：
10.1103/physrevd.81.034006
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发表时间：
2009-10
影响因子：
5
通讯作者：
Li, Run-Hui
中科院分区：
文献类型：
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作者：
Lu, Cai-Dian;S;a, A. I.;Wang, Xiao-Xia;Li, Run-Hui
在m（D）/m（B）和A（QCD）/m（D）展开式中，可以在首阶证明B-（s）介子衰变为两个粲介子（赝标和矢量）的因式分解定理。在微扰QCD方法中，我们发现可因子化的发射图占主导地位。我们计算的分支比与实验数据基本吻合，这表明因子分解定理在预测这些衰变的分支比方面是可靠的。在一个B介子衰变为两个矢量粲介子的过程中，无论是在有W辐射的过程中还是在纯湮灭衰变中，横向极化态的贡献都在40%~ 50%.这与目前的实验数据是一致的。我们还计算了CP不对称参数。结果表明，直接CP不对称性很小。因此，任何大的直接CP不对称性的观测将是新物理学的信号。在中性模中，混合引起的CP不对称性很大。这也与目前的实验测量结果一致。他们可以对其他通道的sin 2 beta测量值进行交叉检查。
The factorization theorem in decays of B-(s) mesons to two charmed mesons (both pseudoscalar and vector) can be proved in the leading order in m(D)/m(B) and A(QCD)/m(D) expansion. Working in the perturbative QCD approach, we find that the factorizable emission diagrams are dominant. Most of branching ratios we compute agree with the experimental data well, which means that the factorization theorem seems to be reliable in predicting branching ratios for these decays. In the decays of a B meson to two vector charmed mesons, the transverse polarization states contribute 40%-50% both in the processes with an external W emission and in the pure annihilation decays. This is in agreement with the present experimental data. We also calculate the CP asymmetry parameters. The results show that the direct CP asymmetries are very small. Thus observation of any large direct CP asymmetry will be a signal for new physics. The mixing induced CP asymmetry in the neutral modes is large. This is also in agreement with the current experimental measurements. They can give a cross-check of the sin2 beta measurement from other channels.
DOI：
--
发表时间：
2004
期刊：
--
影响因子：
--
作者：
D. Boutigny;F. Couderc;J. Gaillard;A. Hicheur;Y. Karyotakis;J. Lees;V. Tisserand;A. Zghiche-A.-Zg
通讯作者：
D. Boutigny;F. Couderc;J. Gaillard;A. Hicheur;Y. Karyotakis;J. Lees;V. Tisserand;A. Zghiche-A.-Zg