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Phys Rev Lett. 2023 Nov 3;131(18):181801. doi: 10.1103/PhysRevLett.131.181801.
We present the first comprehensive tests of the universality of the light leptons in the angular distributions of semileptonic B^{0}-meson decays to charged spin-1 charmed mesons. We measure five angular-asymmetry observables as functions of the decay recoil that are sensitive to lepton-universality-violating contributions. We use events where one neutral B is fully reconstructed in ϒ(4S)→BB[over ¯] decays in data corresponding to 189 fb^{-1} integrated luminosity from electron-positron collisions collected with the Belle II detector. We find no significant deviation from the standard model expectations.
我们展示了对轻子普适性的首次全面测试，该测试针对半轻子(B^{0})介子衰变到带电自旋为1的粲介子的角分布。我们测量了五个角不对称可观测量，它们是衰变反冲的函数，对违反轻子普适性的贡献敏感。我们使用在(\Upsilon(4S)\to B\overline{B})衰变中一个中性(B)完全重建的事件，这些数据来自于用 Belle II 探测器收集的电子 - 正电子碰撞，积分亮度为(189 fb^{-1})。我们发现与标准模型预期没有显著偏差。
