标题： BR（b → τ⁻ ν̄_τ X）的测量值以及 BR（b → τ⁻ ν̄_τ D*± X）和 BR（B⁻ → τ⁻ ν̄_τ）及 BR（b → s ν ν̄）的上限 显示英文标题

标题： Measurements of BR (b -> tau- nubar_tau X) and BR (b -> tau- nubar_tau D*+- X) and Upper Limits on BR (B- -> tau- nubar_tau) and BR (b -> s nu nubar)

摘要： 涉及 b 到 τ 转变的包含性分支比在 LEP 的 ALEPH 探测器收集的大约四百万个有Hadron的Z衰变中被测量。 完全包含性的分支比 b → τ ν X 和半包含性的分支比 b → τ ν D*+/− X 被测量为 (2.43 ± 0.20 ± 0.25)% 和 (0.88 ± 0.31 ± 0.28)%，与标准模型预测一致。 在90%置信水平下，分支比 b → τ ν 和 b → s ν ν̅ 的上限分别设定为 8.3 × 10⁻⁴ 和 6.4 × 10⁻⁴。 这些结果允许在一个类型II双希格斯二重体系框架内，在90%置信水平下设置 tan(β)/mH± 比值的下限为 0.40 (GeV/c²)⁻¹。 显示英文摘要

摘要： Inclusive branching ratios involving b to tau transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio b -> tau nu X and the semi-inclusive branching ratio b -> tau nu D*+/- X are measured to be (2.43 +/- 0.20 +/- 0.25)% and (0.88 +/- 0.31 +/- 0.28)%, in agreement with the standard model predictions. Upper limits on the branching fractions b -> tau nu and b -> s nu nubar are set to 8.3 10**-4 and 6.4 10**-4 at the 90% C.L. These results allow a 90% C.L. lower limit of 0.40 (GeV/c**2)**-1 to be set on the tan(beta)/mH+/- ratio, in the framework of type-II two-Higgs-doublet mode