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arXiv 1504.07892hep-ph
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单重态费米子暗物质模型中的辐射中微子质量

Radiative neutrino masses in the singlet-doublet fermion dark matter model with scalar singlets

Diego Restrepo, Andrés Rivera, Marta Sánchez-Peláez, Oscar Zapata, Walter Tangarife

摘要:

在单重态-二重态费米子暗物质模型中加入$Z_2$ -奇实单重态标量,可以在单圈水平上产生中微子质量和混合。在这项工作中,我们讨论了两个简化的暗物质模型的组合所产生的显着特点。当$Z_2$ -最轻的奇粒子是标量单态时,只要单态-二重态费米子混合足够小,$\operatorname{Br}(μ\to e γ)$是可以测量的。在这种情况下,类矢量费米子到标量的新衰变通道也可以在LHC上产生有趣的轻子加丢失的横能量信号。另一方面,在类二重态费米子暗物质的情况下,标量共湮灭导致遗迹密度的增加,这使得类二重态费米子暗物质的束缚降低。

英文摘要:

When the singlet-doublet fermion dark matter model is extended with additional $Z_2$--odd real singlet scalars, neutrino masses and mixings can be generated at one-loop level. In this work, we discuss the salient features arising from the combination of the two resulting simplified dark matter models. When the $Z_2$-lightest odd particle is a scalar singlet, $\operatorname{Br}(μ\to e γ)$ could be measurable provided that the singlet-doublet fermion mixing is small enough. In this scenario, also the new decay channels of vector-like fermions into scalars can generate interesting leptonic plus missing transverse energy signals at the LHC. On the other hand, in the case of doublet-like fermion dark matter, scalar coannihilations lead to an increase in the relic density which allow to lower the bound of doublet-like fermion dark matter.

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