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Deutsches Elektronen-Synchrotron, 22607 Hamburg.
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
Phys Rev Lett. 2017 Mar 17;118(11):111801. doi: 10.1103/PhysRevLett.118.111801. Epub 2017 Mar 13.
We present a measurement of angular observables and a test of lepton flavor universality in the B→K^{*}ℓ^{+}ℓ^{-} decay, where ℓ is either e or μ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb^{-1} containing 772×10^{6} BB[over ¯] pairs, collected at the ϒ(4S) resonance with the Belle detector at the asymmetric-energy e^{+}e^{-} collider KEKB. The result is consistent with standard model (SM) expectations, where the largest discrepancy from a SM prediction is observed in the muon modes with a local significance of 2.6σ.
我们给出了在(B→K^{*}ℓ^{+}ℓ^{-})衰变中角可观测量的测量以及轻子味普适性的检验，其中(ℓ)为电子或缪子。该分析是在一个对应于(711 fb^{-1})积分亮度的数据样本上进行的，该样本包含(772×10^{6})对(BB)（上划线），是在非对称能量正负电子对撞机KEKB上使用Belle探测器在(\Upsilon(4S))共振处收集的。结果与标准模型（SM）预期一致，其中在缪子模式中观察到与SM预测的最大偏差，局部显著性为(2.6\sigma)。
