Neutrino mass induced radiatively by supersymmetric leptoquarks

Abstract

We show how nonzero Majorana neutrino masses can be radiatively generated by extending the MSSM with leptoquark chiral multiplets without violating R-parity. It is found that, with these particles, the R-parity conservation does not imply lepton number conservation. Neutrino masses generated at a one-loop level are closely related to the down quark mass matrix. The ratio of neutrino mass-squared splittings $\Delta m_{{\nu }_2-{\nu }_1}^2/\Delta m_{{\nu }_3-{\nu }_2}^2$ obtained is naturally close to $\Delta m_{s-d}^2/\Delta m_{b-s}^2\sim 10^{-3}$ which is in the right region required to explain both the atmospheric neutrino data and the MSW solutions for the solar neutrino data.

13 pages, one figure, more constraints added. To appear in Phys. Lett. B

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