A Minimal Three Generation Seesaw Scenario for Lsnd
نویسندگان
چکیده
We show that in the minimal three generation seesaw models for neutrinos, the presence of leptonic (Le+Lμ−Lτ )×S2 symmetry leads to one of the right handed neutrinos remaining massless. This state can then be identified with the sterile neutrino required for a simultaneous understanding of solar, atmospheric and LSND observations. We present a gauge model where the presence of higher dimensional operators originating from Planck scale physics lead to a realistic 2+2 mixed scenario that fits all oscillation data. The model predicts a range for the mixing angle Ue3 and an effective mass for neutrinos emitted in tritium decay, which can be used to test this model.
منابع مشابه
Seesaw Right Handed Neutrino as the Sterile Neutrino for LSND
Abstract We show that a double seesaw framework for neutrino masses with μ − τ exchange symmetry can lead to one of the righthanded seesaw partners of the light neutrinos being massless. This can play the role of a light sterile neutrino, giving a 3 + 1 model that explains the LSND results. We get a very economical scheme, which makes it possible to predict the full 4× 4 neutrino mass matrix if...
متن کاملConnecting Bimaximal Neutrino Mixing to a Light Sterile Neutrino
It is shown that if small neutrino masses owe their origin to the conventional seesaw mechanism and the MNS mixing matrix is in the exact bimaximal form, then there exist symmetries in the theory that allow one of the righthanded neutrinos to become naturally massless, making it a candidate for the sterile neutrino discussed in the literature. Departures from the exact bimaximal limit leads to ...
متن کاملar X iv : h ep - p h / 06 10 43 9 v 1 3 1 O ct 2 00 6 LFV in tau and muon decays within SUSY seesaw
In these proceedings we present the results for lepton flavour violating tau and muon decays within the SUSY seesaw scenario. Specifically, we consider the Constrained Minimal Supersymmetric Standard Model extended by three right handed neutrinos, νR i and their corresponding SUSY partners, ˜ νR i , (i = 1, 2, 3), and use the seesaw mechanism for neutrino mass generation. We include the predict...
متن کاملThree-Flavour Neutrino-Mixing Implications of the LSND Result
The LSND result is shown to fit into a minimal three-flavour neutrino-mixing scenario capable of describing all known experimental facts provided the large ∆M = m23 − m 2 2 ∼ m 2 3 − m 2 1 lies in the range 2.5 × 10 −1 < ∆M < 3.0 eV. In this range the value of Pμτ is expected to be about 5% or larger.
متن کاملFour Light Neutrinos in Singular Seesaw Mechanism with Abelian Flavor Symmetry
The four light neutrino scenario, which explains the atmosphere, solar and LSND neutrino experiments, is studied in the framework of singular seesaw mechanism. By taking the Dirac neutrino mass matrix to be also singular, the right-handed neutrino Majorana mass can be at 1014 GeV scale. Abelian flavor symmetry is used to produce the required neutrino mass pattern. Maximal mixings between the νμ...
متن کامل