论文标题
增强$ b_s \ to e^+ e^ - $ $ $ $ $在两个higgs doublet模型中可观察到的水平
Enhancing $B_s \to e^+ e^-$ to an Observable Level in the Two-Higgs-Doublet Model
论文作者
论文摘要
由于螺旋抑制效应，在标准模型中，稀有衰减通道$ b_s \ to e^+ e^ - $具有衰减概率，比当前实验限制低五个数量级。因此，在当前或即将进行的实验中对此通道的任何观察都将为超出标准模型以外的物理学提供明确的证据。在这项工作中，我们首次提出了一个新的物理场景，其中分支分数$ \ bar {\ Mathcal {b}} r（b_s \ to e^+ e^ - ）$被增强至值，以使当前实验界限饱和。更具体地说，我们研究了一般的两-higgs-doublet模型（2HDM），其拟尺度耦合与电子质量不抑制的电子。此外，我们演示了这种情况如何来自夸克 - 莱普顿统一的紫外线完整理论，该理论可以低尺度生活。后一个步骤使我们能够建立$ b_s \与e^+ e^ - $和Lepton-flavour-violating之间的相关性，而$τ^{ - } \toμ^{ - } e^+ e^ - $和$τ\ $和$τ\ toμγ$。
As a result of the helicity suppression effect, within the Standard Model the rare decay channel $B_s \to e^+ e^-$ has a decay probability which is five orders of magnitude below current experimental limits. Thus, any observation of this channel within the current or forthcoming experiments will give unambiguous evidence of Physics Beyond the Standard Model. In this work, we present for the first time a New Physics scenario in which the branching fraction $\bar{\mathcal{B}}r(B_s \to e^+ e^-)$ is enhanced up to values which saturate the current experimental bounds. More concretely, we study the general Two-Higgs-Doublet Model (2HDM) with a pseudoscalar coupling to electrons unsuppressed by the electron mass. Furthermore, we demonstrate how this scenario can arise from a UV-complete theory of quark-lepton unification that can live at a low scale. This latter step allows us to establish correlations between $B_s \to e^+ e^-$ and the lepton-flavour-violating decays $τ^{-}\to μ^{-}e^+ e^-$ and $τ\to μγ$.
