利用贝尔2号的\(189 \mathrm{fb}^{-1}\)数据测量轻子包含半轻子的比率\(B\)衰变率\(R(X_{e/\mu})\) = \(\mathcal{B}(B \rightarrow X e \nu)\) / \(\mathcal{B}(B \rightarrow X \mu \nu) \)

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