Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-01-26
Nucl.Phys. B687 (2004) 31-54
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 6 figures. Typos corrected, references added, to appear in NPB
Scientific paper
10.1016/j.nuclphysb.2004.03.014
The PMNS neutrino mixing matrix U_{PMNS} is in general a product of two unitary matrices U_{lep} and U_{\nu} arising from the diagonalization of the charged lepton and neutrino mass matrices, U_{PMNS} = U^{\dagger}_{lep} U_{\nu}. Assuming that U_{\nu} is a bimaximal mixing matrix, we investigate the possible forms of U_{lep}. We identify three possible generic structures of U_{lep}, which are compatible with the existing data on neutrino mixing. One corresponds to a hierarchical ``CKM-like'' matrix. In this case relatively large values of the solar neutrino mixing angle \theta_{sol}, and of |U_{e3}|^2, are typically predicted, \tan^2\theta_{sol} \gtap 0.42, |U_{e3}|^2 \gtap 0.02, while the atmospheric neutrino mixing angle \theta_{atm} can deviate noticeably from \pi/4, \sin^2 2\theta_{atm} \gtap 0.95. The second corresponds to one of the mixing angles in U_{lep} being equal to \pi/2, and predicts practically maximal atmospheric neutrino mixing \sin^2 2\theta_{atm} \simeq 1. Large atmospheric neutrino mixing, \sin^2 2\theta_{atm} \gtap 0.95, is naturally predicted by the third possible generic structure of U_{lep}, which corresponds to all three mixing angles in U_{lep} being large. We focus especially on the case of CP-nonconservation, analyzing it in detail. We show how the CP-violating phases, arising from the diagonalization of the neutrino and charged lepton mass matrices, contribute to the measured neutrino mixing observables.
Frampton Paul H.
Petcov Serguey T.
Rodejohann Werner
No associations
LandOfFree
On Deviations from Bimaximal Neutrino Mixing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On Deviations from Bimaximal Neutrino Mixing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On Deviations from Bimaximal Neutrino Mixing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-143243