Sterile neutrino creating a reduced LSND effect
نویسنده
چکیده
Although the hypothetic sterile neutrino νs is probably not involved significantly in the deficits of solar νe’s and atmospheric νμ’s, it may cause the possible LSND effect. In fact, we face such a situation, when the popular nearly bimaximal texture of active neutrinos νe , νμ , ντ is perturbed through a small rotation in the 14 plane, where ν4 is the extra neutrino mass state induced by the sterile neutrino νs. Then, with m 2 1 ≃ m2 we predict in the simplest case of s13 → 0 that sin 2θLSND = s14/2 and ∆mLSND = |∆m41|. However, the negative Chooz experiment imposes on s14/2 the upper bound 1.3× 10, suggesting a reduction of the amplitude of possible LSND effect. PACS numbers: 12.15.Ff , 14.60.Pq , 12.15.Hh .
منابع مشابه
Possible LSND effect as a small perturbation of the bimaximal texture for three active neutrinos
A particular form of mixing matrix for three active and one sterile neutrinos is proposed. Its 3× 3 part describing three active neutrinos arises from the popular bimaximal mixing matrix that works satisfactorily in solar and atmospheric experiments if the LSND effect is ignored. Then, the sterile neutrino, effective in the fourth row and fourth column of the proposed mixing matrix, is responsi...
متن کاملA four–neutrino texture implying bimaximal flavor mixing and reduced LSND effect∗
A four–neutrino effective texture is described, where a sterile neutrino mixes nearly maximally with the electron neutrino and so, is responsible for the deficit of solar νe’s (according to the large–angle MSW solution or vacuum solution, of which the former is selected a posteriori). But, while maximal mixing of muon neutrino with tauon neutrino causes the deficit of atmospheric νμ’s, the orig...
متن کاملSeesaw 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 کاملThree-generation neutrino mixing and LSND dark matter neutrinos
The reported signal at the LSND experiment, when interpreted as neutrino mixing with δm = 6 eV, provides evidence for neutrinos with a cosmologically significant mass. However, attempts to reconcile this interpretation of the experiment with other hints about neutrino properties require a (sterile) fourth neutrino and/or an “inverted” neutrino mass hierarchy. An interpretation of the LSND exper...
متن کامل3+1 sterile neutrinos at the CNGS
We study the potential of the CNGS beam in constraining the parameter space of a model with three active plus one sterile neutrino such as to explain the LSND results. We perform our analysis using the OPERA detector as a reference (our analysis can be upgraded including a detailed simulation of the ICARUS detector). We point out that the best channel to look for sterile neutrinos at the CNGS b...
متن کامل