Neutrino mass and baryon asymmetry from Dirac seesaw
نویسندگان
چکیده
منابع مشابه
Neutrino Mass and Baryon Asymmetry from Dirac Seesaw
We extend the visible content of the standard model (SM) with a hidden sector composed of three right-handed singlet neutrinos and one singlet Higgs. These extra singlets are charged under a new U(1)X gauge symmetry while the SM particles are not. Two heavy scalar doublets are introduced to play the role of the messengers between the visible and hidden sectors. The neutrinos naturally acquire t...
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Non-zero neutrino masses and mixing angles provide at the moment the only convincing evidence 1 of physics beyond the standard model. A paradigm to understand the smallness of neutrino masses, involving some new heavy states which break lepton number, is called the seesaw mechanism 2. If the heavy particles couple to the Standard Model lepton and Higgs doublets, decoupling of them generates at ...
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In theories where B−L is a spontaneously broken local symmetry, the cosmological baryon asymmetry can be generated by the out-of-equilibrium decay of heavy Majorana neutrinos. We study this mechanism assuming a similar pattern of mixings and masses for leptons and quarks, as suggested by SO(10) unification. This implies that B−L is broken at the unification scale ΛGUT ∼ 1016 GeV, if mνμ ∼ 3 ·10...
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We conjecture that three light Majorana neutrinos and their right-handed counterparts may have a universal geometric mass hierarchy. Incorporating this phenomenological conjecture with the Fritzsch texture of lepton mass matrices in a simple seesaw mechanism, we show that it is possible to simultaneously account for current neutrino oscillation data and the cosmological baryon number asymmetry ...
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We propose a new model to explain the neutrino masses, the dark energy and the baryon asymmetry altogether. In this model, neutrinos naturally acquire small Majorana masses via type-II seesaw mechanism, while the pseudo-Nambu-Goldstone bosons associated with the neutrino massgeneration mechanism provide attractive candidates for dark energy. The baryon asymmetry of the universe is produced from...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2006
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2006/12/010