Large Quark Rotations Neutrino Oscillations and Proton Decay

The huge freedom in the SM fermionic mass matrices allows for large RH and LH quark rotations. This is a natural possibility in view of the observed large leptonic mixing. Proton decay and especially its gauge mediated decay is sensitive also to those mixing angles which are non-relevant in the SM. A model with realistic mass matrices and large rotations is presented. It is shown that the large leptonic mixing leads to enhancement of the proton decay branching ratios involving muons.