Neutrino mixing in the seesaw model

Junya Hashida*, Takuya Morozumi, Agus Purwanto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We study the neutrino mixing matrix (the MNS matrix) in the seesaw model. By assuming a large mass hierarchy for the heavy right-handed Majorana mass, we show that, in the diagonal Majorana base, the MNS matrix is determined by a unitary matrix, S, which transforms the neutrino Yukawa matrix, yν, into a triangular form, yΔ. The mixing matrix of light leptons is VKM-S*, where VKM ≡ VLeV and S* ≡ VS*. Large mixing may occur without fine tuning of the matrix elements of yΔ even if the usual KM-like matrix VKM is given by VKM = 1. This large mixing naturally may satisfy the experimental lower bound of the mixing implied by the atmospheric neutrino oscillation.

Original languageEnglish
Pages (from-to)379-391
Number of pages13
JournalProgress of Theoretical Physics
Issue number2
Publication statusPublished - Feb 2000
Externally publishedYes


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