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Phys Rev Lett. 2024 Sep 6;133(10):101804. doi: 10.1103/PhysRevLett.133.101804.
We present the results of a search for the b→dℓ^{+}ℓ^{-} flavor-changing neutral-current rare decays B^{+,0}→(η,ω,π^{+,0},ρ^{+,0})e^{+}e^{-} and B^{+,0}→(η,ω,π^{0},ρ^{+})μ^{+}μ^{-} using a 711 fb^{-1} data sample that contains 772×10^{6} BB[over ¯] events. The data were collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We find no evidence for signal and set upper limits on branching fractions at the 90% confidence level in the range (3.8-47)×10^{-8} depending on the decay channel. The obtained limits are the world's best results. This is the first search for the channels B^{+,0}→(ω,ρ^{+,0})e^{+}e^{-} and B^{+,0}→(ω,ρ^{+})μ^{+}μ^{-}.
我们展示了利用一个包含(772×10^{6})个(B\overline{B})事件的(711 fb^{-1})数据样本，对味改变中性流稀有衰变(B^{+,0}→(η,ω,π^{+,0},ρ^{+,0})e^{+}e^{-})和(B^{+,0}→(η,ω,π^{0},ρ^{+})μ^{+}μ^{-})进行搜索的结果。数据是在KEKB非对称能量(e^{+}e^{-})对撞机上，使用Belle探测器在(Υ(4S))共振处收集的。我们没有发现信号证据，并在(90%)置信水平下，根据衰变通道在((3.8 - 47)×10^{-8})范围内设置了分支比的上限。所获得的限制是世界最佳结果。这是首次对(B^{+,0}→(ω,ρ^{+,0})e^{+}e^{-})和(B^{+,0}→(ω,ρ^{+})μ^{+}μ^{-})通道进行搜索。
