Search for B−→μ−ν¯μ Decays at the Belle Experiment
Search for B−→μ−ν¯μ Decays at the Belle Experiment
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在贝尔实验中寻找 B 的衰变
DOI：
10.1103/physrevlett.121.031801
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发表时间：
2018
影响因子：
8.6
通讯作者：
Badhrees, I.
中科院分区：
文献类型：
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作者：
Sibidanov, A.;Varvell, K. E.;Adachi, I.;Aihara, H.;Al Said, S.;Asner, D. M.;Aushev, T.;Ayad, R.;Babu, V.;Badhrees, I.
我们报道了在KEKB非对称能量对撞机上用贝儿探测器在近4S共振处收集的含有对的中微子样品对稀有的纯轻子衰变的研究结果。信号事件的选择是基于高动量μ子的存在和事件的其余部分的拓扑结构，其显示出一般介子衰变的性质，以及丢失的能量和动量与来自信号衰变的中微子的假设一致。我们发现，在包含系统不确定性的背景值上有2.4个标准偏差，对应于B（B-→μ-ν <$μ）=（6.46±2.22±1.60）×10-7的分支分数，或对应于B（B-→ μ-ν <$μ）的分支分数的频率90%置信区间。
We report the results of a search for the rare, purely leptonic decayperformed with adata sample that containspairs, collected near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energycollider. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of B(B-→μ-ν¯μ)=(6.46±2.22±1.60)×10-7 or a frequentist 90% confidence level interval on thebranching fraction of.