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- W4380854552 abstract "We present two models where the familiar leptonic symmetry Le−Lμ−Lτ is a gauge symmetry. We show how anomaly cancellation constrains the allowed theories, with one of them requiring a fourth sequential chiral standard model fermion generation and a second one with three generations, requiring gauging of (Le−Lμ−Lτ)−(B1−B2−B3) with Ba representing the baryon number of the ath generation quarks. Unlike global Le−Lμ−Lτ models which always leads to inverted mass hierarchy for neutrinos, the gauged version can lead to normal hierarchy. We show how to construct realistic models in both the cases and discuss the dark matter candidate in both. In our model, the breaking of U(1)Le−Lμ−Lτ is responsible for neutrino mass via type-I mechanism whereas the real part of U(1)Le−Lμ−Lτ breaking scalar field (called ϕ here) plays the role of freeze-in dark matter candidate. Since ϕ is unstable, for it to qualify as dark matter, its lifetime must be larger than the age of the Universe, implying that the relic of ϕ is generated through freeze-in mechanism and its mass must be less than an MeV. We also discuss the possibility of explaining both muon and electron g−2 while being consistent with the DM relic density and lifetime constraints." @default.
- W4380854552 created "2023-06-16" @default.
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- W4380854552 date "2023-08-01" @default.
- W4380854552 modified "2023-09-28" @default.
- W4380854552 title "Gauged L − L − L symmetry, fourth generation, neutrino mass and dark matter" @default.
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- W4380854552 doi "https://doi.org/10.1016/j.physletb.2023.138011" @default.
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