论文标题
$ s_4 $ family对称性的扩展Multihiggs Doublet模型的现象学
Phenomenology of extended multiHiggs doublet models with $S_4$ family symmetry
论文作者
论文摘要
我们提出了扩展的3HDM和4HDM型号,其中SM量规对称性由自发破损的$ S_4 $组放大,保存的$ Z_2 $和损坏的$ Z_4 $ cyclicymetries。每个型号都有三个主动$ SU(2)$标量双线,此外,第一个具有额外的惰性标量单元,而第二个型号具有惰性标量双线。此外,每种型号都有几个额外的量规标量标量,这些标量是$ s_4 $的三重态。这两种模型都产生了费米昂领域的质量矩阵的相同结构,在那里,辐射的Seesaw通过$ s_4 $ $ $ s_4 $ triplets在一环水平上产生微小的光主动中微子质量。重量标量介导的风味变化中性电流的存在使我们能够研究$(k^0- \ overline {k}^0)$和$(b_ {d,s}^0- \ overline {b} _ {b} _ {d,s}^0)$ MESON $ MESON $ MESON $ MESON $ MESON混合在当前满足实验性约束的参数。另一方面,由于保留的$ z_2 $对称性,我们提出的模型具有稳定的标量和费米金暗物质候选者。此外,这些模型与Sm fermion质量和混合的当前模式一致,并与测量的暗物质物质丰度,并成功地适应了介子振荡和倾斜参数所产生的约束。我们模型中的额外标量提供了对斜参数的辐射校正,由于标量惰性双线的存在,因此4HDM的限制性少于3HDM。
We propose extended 3HDM and 4HDM models where the SM gauge symmetry is enlarged by the spontaneously broken $S_4$ group, the preserved $Z_2$ and broken $Z_4$ cyclic symmetries. Each model has three active $SU(2)$ scalar doublets, in addition, the first one has an extra inert scalar singlet, whereas the second model has an inert scalar doublet. Furthermore, each model has several extra gauge singlet scalars, which are triplets under $S_4$. Both models yield the same structure of the mass matrices for the fermion sector, where a radiative seesaw generates the tiny light active neutrinos masses at one-loop level, through the $S_4$ triplets. The presence of flavor changing neutral currents mediated by heavy scalars allowed us to study the $(K^0-\overline{K}^0)$ and $(B_{d,s}^0-\overline{B}_{d,s}^0)$ meson mixings, in the parameter space that currently satisfies the experimental constraints. On the other hand, due to the preserved $Z_2$ symmetry, our proposed models have stable scalar and fermionic dark matter candidates. Furthermore, these models are consistent with the current pattern of SM fermion masses and mixings, with the measured dark matter relic abundance and successfully accommodate the constraints arising from meson oscillations and oblique parameters. The extra scalars in our models provide radiative corrections to the oblique parameters, where due to the presence of the scalar inert doublet, renders the 4HDM less restrictive than the 3HDM one.