Physical constraints derived from FCNC in the 3-3-1-1 model
英文摘要：
We investigate several phenomena related to FCNCs in the $\text{3-3-1-1}$ model. The sources of FCNCs at the tree-level from both the gauge and Higgs sectors are clarified. Experiments on the oscillation of mesons most stringently constrain the tree-level FCNCs. The lower bound on the new physics scale is imposed more tightly than in the previous, $\text{M}_{\text{new}}>12 $ \text{TeV}. Under this bound, the tree-level FCNCs make a negligible contribution to the $\text{Br}(B_s \rightarrow μ^+ μ^-)$, $\text{Br}(B \rightarrow K^{*} μ^+ μ^-)$ and $\text{Br}(B^{+}\rightarrow K^{+}μ^{+}μ^{-})$. The branching ratio of radiative decay $b \rightarrow s γ$ is enhanced by the ratio $\frac{v}{u}$ via diagrams with the charged Higgs mediation. In contrast, the charged currents of new gauge bosons significantly contribute to the decay process $μ\rightarrow e γ$.
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