论文标题
$τ$衰减中的Lepton风味普遍性
Lepton Flavour Universality in $τ$ decays
论文作者
论文摘要
在过去几年中，半乳房$ b $ dep的证据违反了$ b $ $ $ b $ - 违反的证据。依靠一般有效的现场理论（EFT）结果，已经表明，解决$ b $ andemalies的模型必然会导致一环的偏离，以$τ$衰减的LFU偏离$τ$的每公里水平。一旦指定了（可汇量化的）紫外线模型，则领先的EFT结果将从紫外线尺度的匹配中获得有限的校正。我们基于扩展的$ su（4）\ times su（3）\ times su（2）\ times u（1）$ g量规部门，我们将在B-Anosies的动机类模型中讨论此类更正。在这种情况下，就新重型场的群众和耦合而言，我们可以为有效的$ w $ boson和$ z $ -Boson耦合获得精确的预测。我们确认了每极偏离普遍性的偏差，在未来的高精度实验中。
The evidence for Lepton Flavour Universality (LFU) violation in semileptonic $B$-decays has been rising over the past few years. Relying on generic effective field theory (EFT) results, it has been shown that models addressing the $B$-anomalies necessarily lead, at one-loop, to deviations from LFU in $τ$ decays at the few per-mil level. Once a (renormalizable) UV model is specified, the leading-log EFT result receives finite corrections from the matching at the UV scale. We discuss such corrections in a motivated class of models for the B-anomalies, based on an extended $SU(4) \times SU(3) \times SU(2) \times U(1)$ gauge sector. In this scenario, we obtain precise predictions for the effective $W$-boson and $Z$-boson couplings to leptons in terms of the masses and couplings of the new heavy fields. We confirm a few per-mil deviation from universality, within reach of future high-precision experiments.
