Leptogenesis and low-energy phases
نویسندگان
چکیده
منابع مشابه
Leptogenesis and low-energy phases
In supersymmetric models, the CP asymmetry produced in the decay of the lightest right-handed neutrino, ≡ ǫ, can be written as a function of weak scale parameters. We introduce a way of separating ǫ into contributions from the various weak-scale phases, and study the contribution of potentially measurable neutrino phases to leptogenesis. We find that the Majorana phase φ′, which could have obse...
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An attractive explanation for non-zero neutrino masses and small matter antimatter asymmetry of the present Universe lies in “leptogenesis”. At present the size of the lepton asymmetry is precisely known, while the sign is not known yet. In this work we determine the sign of this asymmetry in the framework of two right handed neutrino models by relating the leptogenesis phase(s) with the low en...
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We relate leptogenesis in a class of theories to low-energy experimental observables: quark and lepton masses and mixings. With reasonable assumptions motivated by grand unification, one can show that the CP-asymmetry parameter takes a universal form. Furthermore the dilution mass is related to the light neutrino masses. Overall, these models offer a natural explanation for a lepton asymmetry i...
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Leptogenesis in a left–right symmetric model is investigated for all possible neutrino mass hierarchies. The predictions of the model for low energy parameters as measured in neutrinoless double beta decay and in oscillation experiments are compared. The preferred values of the Majorana phases and limits on the smallest mass state are given. The main observation is that for the inverse hierarch...
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There are only two viable low-energy E6 subgroups: SU(3)C ×SU(2)L ×U(1)Y × U(1)N or SU(3)C × SU(2)L × SU(2)′R × U(1)YL+Y ′ R , which would not erase any preexisting lepton asymmetry of the Universe that may have been created by the decay of heavy singlet (right-handed) neutrinos or any other mechanism. They are also the two most favored E6 subgroups from a recent analysis of present neutral-cur...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2003
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(02)00972-0