Phys. Rev. D 66, 117301 (2002) [3 pages]All-purpose neutrino mass matrixReceived 8 August 2002; published 30 December 2002 A four-parameter Majorana neutrino mass matrix is proposed, which is exactly diagonalizable with two mixing angles, one of which is π/4 and the other large but less than π/4. The form of this mass matrix allows seven realizations of the present data on atmospheric and solar neutrino oscillations: three have the normal hierarchy, two have the inverse hierarchy, and two have three nearly degenerate masses. The possible inclusion of CP violation is also discussed. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.66.117301
DOI:
10.1103/PhysRevD.66.117301
PACS:
14.60.Pq
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