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We study the symmetric texture of geometric form with 2-zeros to see if it is consistent with the presently-known neutrino masses and mixings. In the neutrino mass matrix elements we obtain numerically the allowed region of the parameters including CP violating phases, which can reproduce the present neutrino experiment data. The result of this analysis… (More)

- Masako Bando, Midori Obara
- 2003

Within the framework of grand unified theories, we make full analysis of symmetric texture to see if such texture can reproduce large neutrino mixings, which have recently been confirmed by the observed solar and atmospheric neutrino oscillation experiments. It is found that so-called symmetric texture with anomalous U(1) family symmetry with… (More)

We study the SUSY SO(10) GUT with the symmetric two-zero textures of quark/lepton mass matrix which realize the Georgei-Jarlskog relations in down-type quark and charged lepton masses. We show that the important constraints to such framework come from the bottom-tau unification and the observed value of sin 2β, one of the angles in the CKM unitarity… (More)

- Midori Obara, Gi-Chol, Makiko Nagashima, Akio Sugamoto
- 2001

Mass matrices of quarks are studied in the Supersymmetric E6 GUT. After decomposition into SU(5), there are two 5 representations in each generation, which consist of the lepton doublet and the right-handed down-type quarks. It is known that the observed quark and lepton mixing matrices could be reproduced well if an appropriate interchange (twisting)… (More)

- K I MASUDA, K OKAMURA, J I AOYAMA, M OBARA
- The Journal of vitaminology
- 1955

- Masako Bando, Midori Obara
- 2003

We demonstrate that under the ”symmetric zero texture” with minimal Majorana mass matrix, neutrino masses and mixing angles are expressed in terms of up-quark masses, mt,mc,mu. This provides interesting relations among neutrino mixing angles and up-type quark masses. Especially we predict |Ue3| ≤ 0.11 even if we include the small mixing effects coming from… (More)

- Midori Obara
- 2006

Taking three right-handed Majorana neutrino masses Mi to be partially non-degenerate, we make a new analysis of the Fukugita-Tanimoto-Yanagida ansatz and confront it with current neutrino oscillation data. We determine the parameter space for cases (A) M3 = M2 6= M1, (B) M2 = M1 6= M3 and (C) M1 = M3 6= M2, and examine their respective deviations from the… (More)

We study the symmetric 2-zero texture of the neutrino mass matrix, which is obtained from the symmetric Dirac neutrino mass matrix with 2-zeros and right-handed Majorana neutrino mass matrix with the general form via the see-saw mechanism, for the SUSY SO(10) GUT model including the Pati-Salam symmetry. We show that the only one texture in our model, having… (More)

- Masako Bando, Midori Obara
- 2002

Under the assumption of symmetric four zero texture for fermion mass matrices in SO(10) model, the neutrino Dirc mass matrix is derived from the up-quark mass matrix. By adjusting two scales of the Majorana mass sector, we can derive observed neutrino two large mixing angles very naturally. It is indeed remarkable that all the masses and mixings of… (More)

- Midori Obara, Gi-Chol, Makiko Nagashima, Akio Sugamoto
- 2001

Mass matrices of quarks are studied in the Supersymmetric E6 GUT. After decomposition into SU(5), there are two 5 representations in each generation, which consist of the lepton doublet and the right-handed down-type quarks. It is known that the observed quark and lepton mixing matrices could be reproduced well if an appropriate interchange (twisting)… (More)

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