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.

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