2020-03-31T19:36:06Z
https://digital.csic.es/dspace-oai/request
oai:digital.csic.es:10261/124916
2016-02-18T03:29:37Z
com_10261_61
com_10261_4
col_10261_314
00925njm 22002777a 4500
dc
Marzocca, David
author
Petcov, Serguey T.
author
Romanino, Andrea
author
Cerdá Sevilla, María
author
2013-05-01
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.
Journal of High Energy Physics 05 (5): 073 - 27 (2013)
1029-8479
http://hdl.handle.net/10261/124916
10.1007/JHEP05(2013)073
1029-8479
http://dx.doi.org/10.13039/501100000780
Neutrino Physics
CP violation
Nonzero |U_e3| from charged lepton corrections and the atmospheric neutrino mixing angle