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arXiv · 2205.09794

Type III Neutrino Seesaw, Freeze-In Long-Lived Dark Matter, and the $W$ Mass Shift

Ernest Ma
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Abstract

In the framework of seesaw neutrino masses from heavy fermion triplets $(Σ^+,Σ^0,Σ^-)$, the addition of a light fermion singlet $N$ and a heavy scalar triplet $(ρ^+,ρ^0,ρ^-)$ has some important consequences. The new particles are assumed to be odd under a new $Z_2$ symmetry which is only broken softly, both explicitly and spontaneously. With $N-Σ^0$ mixing, freeze-in long-lived dark matter through Higgs decay becomes possible. At the same time, the $W$ mass is shifted slightly upward, as suggested by a recent precision measurement.

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Ernest Ma. 2022-05-23. Type III Neutrino Seesaw, Freeze-In Long-Lived Dark Matter, and the $W$ Mass Shift. https://doi.org/10.1016/j.physletb.2022.137327

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