6533b7dcfe1ef96bd1272143
RESEARCH PRODUCT
Nonzero |U_e3| from charged lepton corrections and the atmospheric neutrino mixing angle
Andrea RomaninoMaría Cerdá SevillaS. T. PetcovDavid Marzoccasubject
NEUTRINO MIXING CP VIOLATION CHOOZ ANGLE ATMOSPHERIC NEUTRINO MIXING ANGLE CHERGED LEPTON CORRECTIONSNuclear and High Energy PhysicsParticle physicsSolar neutrinoCHOOZ ANGLEPontecorvo–Maki–Nakagawa–Sakata matrixInverseFOS: Physical sciencesType (model theory)7. Clean energy01 natural sciencesHigh Energy Physics - Phenomenology (hep-ph)CHERGED LEPTON CORRECTIONS0103 physical sciencesNeutrino Physics010306 general physicsNeutrino oscillationPhysics010308 nuclear & particles physicsATMOSPHERIC NEUTRINO MIXING ANGLENEUTRINO MIXINGSettore FIS/02 - Fisica Teorica Modelli e Metodi MatematiciHigh Energy Physics - PhenomenologyCP violationCP violationCP VIOLATIONNeutrinoLeptondescription
After the successful determination of the reactor neutrino mixing angle theta(13) not equal 0.16 not equal 0, a new feature suggested by the current neutrino oscillation data is a sizeable deviation of the atmospheric neutrino mixing angle theta(23) from pi/4. Using the fact that the neutrino mixing matrix U = (UeU nu)-U-dagger, where U-e and U-nu result from the diagonalisation of the charged lepton and neutrino mass matrices, and assuming that U-nu has a i) bimaximal (BM), H) tri-bimaximal (TBM) form, or else Hi) corresponds to the conservation of the lepton charge L' = L-e - L mu - L-tau (LC), we investigate quantitatively what are the minimal forms of U-e, in terms of angles and phases it contains, that can provide the requisite corrections to U-nu so that theta(13), theta(23) and the solar neutrino mixing angle theta(12) have values compatible with the current data. Two possible orderings of the 12 and the 23 rotations in U-e, "standard" and "inverse", are considered. The results we obtain depend strongly on the type of ordering. In the case of "standard" ordering, in particular, the Dirac CP violation phase delta, present in U, is predicted to have a value in a narrow interval around i) delta similar or equal to pi in the BM (or LC) case, H) delta congruent to 3 pi/2 or pi/2 in the TBM case, the CP conserving values delta = 0, pi, 2 pi being excluded in the TBM case at more than 4 sigma.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-05-01 |