Neutrino mass and mixing in the seesaw playground
نویسندگان
چکیده
منابع مشابه
Neutrino Mass and Mixing in the Seesaw Playground∗
We discuss neutrino mass and mixing in the framework of the classic seesaw mechanism, involving right-handed neutrinos with large Majorana masses, which provides an appealing way to understand the smallness of neutrino masses. However, with many input parameters, the seesaw mechanism is in general not predictive. We focus on natural implementations of the seesaw mechanism, in which large cancel...
متن کاملNeutrino mixing in Seesaw model
We study the neutrino mixing matrix (MNS matrix) in seesaw model. Assuming large mass hierarchy for heavy right-handed Majorana mass, we show that MNS matrix is determined by a unitary matrix which transforms neutrino yukawa term into a triangular form. Large mixing may occur even if yukawa matrix for charged lepton and that for neutrino is simultaneously diagonalized by biunitary transformatio...
متن کاملNeutrino Mixing in a Democratic-Seesaw-Mass-Matrix Model
On the basis of a seesaw-type mass matrix model for quarks and leptons, Mf ≃ mLM F mR, wheremL ∝ mR are universal for f = u, d, ν and e (up-quark-, down-quark-, neutrinoand charged lepton-sectors), and MF has a form [(unit matrix)+(democratic-type matrix)], neutrino masses and mixings are investigated. It is tried to understand a large νμ-ντ mixing, i.e., sin 2 2θ23 ∼ 1, with mν1 ≪ mν2 ∼ mν3, w...
متن کاملNeutrino mixing in the seesaw model
In the seesaw model with hierarchical Dirac masses, the neutrino mixing angle exhibits the behavior of a narrow resonance. In general, the angle is strongly suppressed, but it can be maximal for special parameter values. We delineate the small regions in which this happens, for the two flavor problem. On the other hand, the physical neutrino masses are hierarchical, in general, except in a larg...
متن کاملSeesaw Mechanism and the Neutrino Mass Matrix
The seesaw mechanism of neutrino mass generation is analysed under the following assumptions: (1) minimal seesaw with no Higgs triplets, (2) hierarchical Dirac masses of neutrinos, (3) large lepton mixing primarily or solely due to the mixing in the right-handed neutrino sector, and (4) unrelated Dirac and Majorana sectors of neutrino masses. It is shown that large mixing governing the dominant...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2016
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2015.12.015