标题： B介子和Bs介子的半轻子衰变在Belle中 显示英文标题

标题： Semileptonic B / Bs decays at Belle

摘要： Belle实验在KEKB非对称能e+e-对撞机上记录了B和Bs介子衰变的大数据集。 半轻子衰变B(s) -> X l nu (l = 电子或缪子)约占B(s)介子总衰变宽度的五分之一，并在确定CKM矩阵元V_ub和V_cb中起着重要作用。 介绍了Belle的最新结果，包括B- -> Ds(*) K l nu的研究，首次测量了半包含模式B -> D(*) X l nu以及包含分支比Bf(Bs -> X l nu的测量。 显示英文摘要

摘要： The Belle experiment at the KEKB asymmetric energy e+e- collider recorded large data sets of both, B and Bs decays. Semileptonic decays B(s) -> X l nu (l = electron or muon) constitute approximately one fifth of the total decay width of B(s) mesons and play an important role in the determination of the CKM matrix elements V_ub and V_cb. Recent results from Belle are presented, including the study of B- -> Ds(*) K l nu, the first measurements of semi-inclusive modes B -> D(*) X l nu and the measurement of the inclusive branching fraction Bf(Bs -> X l nu).