论文标题
Lepton风味普遍性的标准模型预测包含半抑制的$ B $衰减
Standard Model predictions for Lepton Flavour Universality ratios of inclusive semileptonic $B$ decays
论文作者
论文摘要
我们提出了对包含$ b \ to x _ {（c）} \ ell \barν_\ ell $的Lepton风味普遍性比率的标准模型预测。对于$ \ ell =μ，e $，这些比率非常接近统一。对于$τ$模式，我们更新了分支比率的SM预测，包括重型夸克扩展中的功率校正，最高$ 1/m_b^3 $。这些包含比率是对D^{（*）} \ ell \barν_\ ell $模式的独家$ b \ to d^{（*）} \ ell \ ell $模式的重要交叉检查，其中这些模式中的预测和测量之间存在张力。
We present Standard Model predictions for lepton flavour universality ratios of inclusive $B\to X_{(c)} \ell \barν_\ell$. For the $\ell=μ,e$, these ratios are very close to unity as expected. For the $τ$ mode, we update the SM prediction for the branching ratio including power-corrections in the heavy-quark expansion up to $1/m_b^3$. These inclusive ratios serve as an important cross-check of the exclusive $B\to D^{(*)}\ell\barν_\ell$ modes, in which tensions exists between the predictions and measurements in those modes.
