论文标题
两种Higgs Doublet模型中的穆恩风味违规
Muon Flavor Violation in Two Higgs Doublet Model with Extra Yukawa Couplings
论文作者
论文摘要
新的一轮实验，MEG II，Comet/Mu2e和Mu3e，很快就会开始将$μ\推向Eγ$，$μn\ to EN $转换，而$μ\ to 3e $ Frontier，而Belle II将探测$τ\ toμγ$和$ f \ f \ f \ f \ f \ f \ f \ f \ frontier。在具有额外Yukawa耦合的两个HIGGS双重模型中，我们表明所有这些过程都探测了违反Lepton风味的（LFV）偶极转变，这些偶极转变来自两个循环机制，并带有标量诱导的接触术语次要介绍。这是因为现有数据表明额外的Yukawa耦合$ρ_{μE}，\，ρ_{ee} \sillsimλ_e$，而$ρ_{τμ}，\，\，ρ_{τττ}标准模型（SM）的常规Yukawa耦合，其中$ρ_{μe}ρ_{tt} $和$ρ_{τμ}ρ_{tt} $分别输入$μeγ$和$μeγ$和$τμγ$两循环放大器。 With the $B_s \to μμ$ decay rate basically consistent with SM expectation, together with the $B_s$ mixing constraint, we show that $B_s \to ττ$ would also be consistent with SM, while $B_s \to τμ$ and $B \to Kτμ$ decays would be out of reach of projected sensitivities, in strong contrast with some models motivated by the B anomalies.
The new round of experiments, MEG II, COMET/Mu2e, and Mu3e, would soon start to push the $μ\to eγ$, $μN \to eN$ conversion, and $μ\to 3e$ frontier, while Belle II would probe $τ\to μγ$ and $τ\to 3μ$. In the general two Higgs doublet model with extra Yukawa couplings, we show that all these processes probe the lepton flavor violating (LFV) dipole transition that arises from the two loop mechanism, with scalar-induced contact terms subdominant. This is because existing data suggest the extra Yukawa couplings $ρ_{μe},\, ρ_{ee} \lesssim λ_e$, while $ρ_{τμ},\, ρ_{ττ} \lesssim λ_τ$ and $ρ_{tt} \lesssim λ_t$, with $λ_i$ the usual Yukawa coupling of the Standard Model (SM), where $ρ_{μe}ρ_{tt}$ and $ρ_{τμ}ρ_{tt}$ enter the $μeγ$ and $τμγ$ two loop amplitudes, respectively. With the $B_s \to μμ$ decay rate basically consistent with SM expectation, together with the $B_s$ mixing constraint, we show that $B_s \to ττ$ would also be consistent with SM, while $B_s \to τμ$ and $B \to Kτμ$ decays would be out of reach of projected sensitivities, in strong contrast with some models motivated by the B anomalies.
