Bi-maximal mixing and Bilinear R violation

Details Bi-maximal mixing and Bilinear R violation Bi-maximal mixing and Bilinear R violation

2002-03-19

arxiv.org/abs/hep-ph/0203182v2

Nucl.Phys. B639 (2002) 290-306

Physics

High Energy Physics

High Energy Physics - Phenomenology

Minor modifications, version to be published in Nucl. Phys. B

Scientific paper

10.1016/S0550-3213(02)00560-6

We perform a general analytic study of feasibility of obtaining a combined explanation for the deficits in the solar and the atmospheric neutrino fluxes with two large mixing angles in supersymmetric model with bilinear R parity violations. The required hierarchy among the solar and atmospheric neutrino mass scales follows in this framework in the presence of an approximate Higgs - slepton universality at the weak scale. The solar mixing angle is shown to be related to non-universality in slepton mass terms specifically to differences in soft parameters of the first two leptonic generations. It is shown that this flavour universality violation should be as strong as the Higgs-slepton universality violation if solar neutrino mixing angle is to be large. The standard supergravity models with universal boundary conditions at a high scale lead to the required Higgs-slepton universality violations but the predicted violation of flavour universality among the first two generations is much smaller than required. This model therefore cannot provide an explanation of large solar neutrino mixing angle unless some universality violations in soft supersymmetry breaking parameters are introduced at a high scale itself.

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