We propose a scenario that the mass splitting between the first generation of the heavy Majorana neutrino and the other two generations of degenerate heavy neutrinos in the seesaw framework is responsible for the deviation of the solar mixing angle from the maximal mixing, while keeping the maximal mixing between the tau and muon neutrinos as it is. On top of the scenario, we show that the tiny breaking of the degeneracy of the two heavy Majorana neutrinos leads to the non-zero small mixing angle Ue3 in the PMNS matrix and the little deviation of the atmospheric neutrino mixing angle from the maximal mixing.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2006 Mar 23|
Bibliographical noteFunding Information:
S.K.K. was supported in part by BK21 program of the Ministry of Education in Korea and in part by KOSEF Grant No. R01-2003-000-10229-0. C.S.K. was supported in part by CHEP-SRC Program and in part by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) No. KRF-2005-070-C00030, and in part by JSPS.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics