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Phys Rev Lett. 2024 Sep 27;133(13):131801. doi: 10.1103/PhysRevLett.133.131801.
We measure the complete set of angular coefficients J_{i} for exclusive B[over ¯]→D^{}ℓν[over ¯]_{ℓ} decays (ℓ=e, μ). Our analysis uses the full 711 fb^{-1} Belle dataset with hadronic tag-side reconstruction. The results allow us to extract the form factors describing the B[over ¯]→D^{} transition and the Cabibbo-Kobayashi-Maskawa matrix element |V_{cb}|. Using recent lattice QCD calculations for the hadronic form factors, we find |V_{cb}|=(40.7±0.7)×10^{-3} using the Boyd-Grinstein-Lebed parametrization, compatible with determinations from inclusive semileptonic decays. We search for lepton flavor universality violation as a function of the hadronic recoil parameter w and investigate the differences of the electron and muon angular distributions. We find no deviation from standard model expectations.
我们测量了排他性(B^0\to D^{\ell}\nu_{\ell})衰变（(\ell = e,\mu)）的全套角系数(J_i)。我们的分析使用了具有强子标记侧重建的完整的(711,\mathrm{fb}^{-1}) Belle数据集。这些结果使我们能够提取描述(B^0\to D^)跃迁的形状因子以及卡比博 - 小林 - 益川矩阵元(|V_{cb}|)。利用最近对强子形状因子的格点量子色动力学计算，我们使用博伊德 - 格林斯坦 - 勒贝德参数化方法得到(|V_{cb}|=(40.7\pm0.7)\times10^{-3})，这与从包含性半轻子衰变得到的结果一致。我们寻找作为强子反冲参数(w)的函数的轻子味普适性破坏，并研究电子和缪子角分布的差异。我们没有发现与标准模型预期的偏差。
