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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
Phys Rev Lett. 2021 Feb 26;126(8):081804. doi: 10.1103/PhysRevLett.126.081804.
The first observation of the suppressed semileptonic B_{s}^{0}→K^{-}μ^{+}ν_{μ} decay is reported. Using a data sample recorded in pp collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2 fb^{-1}, the branching fraction B(B_{s}^{0}→K^{-}μ^{+}ν_{μ}) is measured to be [1.06±0.05(stat)±0.08(syst)]×10^{-4}, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. The decay B_{s}^{0}→D_{s}^{-}μ^{+}ν_{μ}, where D_{s}^{-} is reconstructed in the final state K^{+}K^{-}π^{-}, is used as a normalization channel to minimize the experimental systematic uncertainty. Theoretical calculations on the form factors of the B_{s}^{0}→K^{-} and B_{s}^{0}→D_{s}^{-} transitions are employed to determine the ratio of the Cabibbo-Kobayashi-Maskawa matrix elements |V_{ub}|/|V_{cb}| at low and high B_{s}^{0}→K^{-} momentum transfer.
报道了对压低的半轻子(B_{s}^{0}→K^{-}μ^{+}ν_{μ})衰变的首次观测。利用2012年用大型强子对撞机底夸克探测器（LHCb探测器）在质子-质子碰撞中记录的数据样本，其对应于2(fb^{-1})的积分亮度，测得分支比(B(B_{s}^{0}→K^{-}μ^{+}ν_{μ}))为([1.06±0.05(统计)±0.08(系统)]×10^{-4})，其中第一个不确定度是统计性的，第二个表示组合的系统不确定度。衰变(B_{s}^{0}→D_{s}^{-}μ^{+}ν_{μ})（其中(D_{s}^{-})在末态(K^{+}K^{-}π^{-})中重建）用作归一化道，以最小化实验系统不确定度。利用对(B_{s}^{0}→K^{-})和(B_{s}^{0}→D_{s}^{-})跃迁形状因子的理论计算，来确定在低和高(B_{s}^{0}→K^{-})动量转移下卡比博-小林-益川（Cabibbo-Kobayashi-Maskawa）矩阵元(|V_{ub}|/|V_{cb}|)的比值。
