2020-04-02T00:03:32Z
http://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
Nonzero |U_e3| from charged lepton corrections and the atmospheric neutrino mixing angle
Marzocca, David
Petcov, Serguey T.
Romanino, Andrea
Cerdá Sevilla, María
European Commission
Neutrino Physics
CP violation
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.
This work was supported in part by the INFN program on "Astroparticle Physics", the Italian MIUR program on "Neutrinos, Dark Matter and Dark Energy in the Era of LHC" the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan (S.T.P.), by the European Union FP7-ITN INVISIBLES and UNILHC (Marie Curie Action, PITAN-CA-2011-289442 and PITN-CA-2009-23792), and by the ERC Advanced Grant no. 267985 "DaMESyFla". Part of the work was done at the Galileo Galilei Institute for Theoretical Physics, Florence, Italy, which we thank for the kind hospitality and support.
Peer reviewed
2015-11-12T11:43:58Z
2015-11-12T11:43:58Z
2013-05-01
artículo
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
eng
Preprint
http://dx.doi.org/10.1007/JHEP05(2013)073
Sí
openAccess
Springer