论文标题
优化的Lepton通用性测试在$ b \ to v \ ell \barν$衰减中
Optimized Lepton Universality Tests in $B\to V \ell\barν$ decays
论文作者
论文摘要
我们建议在比较$μ$和$τ$模式时，提出了半蛋白质的$ p \ to v \ ell \barν$衰变的改进的Lepton风味普遍性（LFU）比率，从而最大程度地减少了理论上的形式不确定性。这些优化的比率是通过简单的切割或重新加权DILEPTON质量分布获得的，这意味着在稀有的Tauonic模式上信号的最小损失，同时最大程度地取消了两种模式之间理论不确定性的取消。我们说明了这些可观察物在$ b_c \ to j/ψ$，$ b_c \至ψ（2s）$，$ b \ to d^\ ast $和$ b_s \ to d_s^\ ast $过渡的有用性雇用保守派形式的不确定性。
We propose improved Lepton Flavor Universality (LFU) ratios in semileptonic $P\to V \ell \barν$ decays, when comparing $μ$ and $τ$ modes, that minimize the theoretical form-factor uncertainties. These optimized ratios are obtained with simple cuts or reweighting of the dilepton mass distributions, which imply a minimum loss of signal on the rare tauonic modes while maximizing the cancellation of theoretical uncertainties among the two modes. We illustrate the usefulness of these observables in $B_c\to J/ψ$, $B_c\to ψ(2S)$, $B\to D^\ast$ and $B_s\to D_s^\ast$ transitions, showing that in all cases we can reach $\mathcal{O}(1\%)$ uncertainties on the SM predictions of the improved LFU ratios employing conservatives form-factor uncertainties.
