Scaling in the neutrino mass matrix, μ–τ symmetry and the see-saw mechanism

Joshipura, Anjan S.; Rodejohann, Werner

doi:10.1016/j.physletb.2009.06.035

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Scaling in the neutrino mass matrix, μ–τ symmetry and the see-saw mechanism

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Rodejohann, Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Joshipura, A. S., & Rodejohann, W. (2009). Scaling in the neutrino mass matrix, μ–τ symmetry and the see-saw mechanism. Physics Letters B, 678(3), 276-282. doi:10.1016/j.physletb.2009.06.035.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-7546-C

Abstract

The scaling hypothesis postulates proportionality of two columns of the Majorana neutrino mass matrix in the flavor basis. This Ansatz was shown to lead to an inverted hierarchy and U_{e3} =0. We discuss theoretical and phenomenological properties of this hypothesis. We show that (i) the neutrino mass matrix with scaling follows as a consequence of a generalized mu-tau symmetry imposed on the type-I see-saw model; (ii) there exists a unique texture for the Dirac mass matrix m_D which leads to scaling for arbitrary Majorana matrix M_R in the context of the type-I see-saw mechanism; (iii) unlike in the mu-tau symmetric case, a simple model with two right-handed neutrinos and scaling can lead to successful leptogenesis both with and without the inclusion of flavor effects.