  Supersymmetric Standard Model has been built to solve the hierarchy problem
which is encountered whenever Standard Model is incorporated into a theory with
a larger mass scale. Experimentally, one of the first signals of physics beyond
Standard Model is provided by the atmospheric neutrino experiments which
indicate the existence of at least one non-zero neutrino mass. An
interpretation of both solar and atmospheric neutrino anomalies in terms of
neutrino oscillations would lead to specific patterns for neutrino masses and
mixing. In this thesis, we studied the possibilities of generating the required
neutrino mass patterns in the context of supersymmetric standard models with
lepton number (L) violation. After an introduction to supersymmetric standard
models in Chapter 1, we give an overview of neutrino phenomenology in chapter
2. Chapter 3 discusses analytical and semi-analytical solutions to
Renormalisation Group Equations (RGE) with lepton number violating couplings in
the superpotential. Neutrino masses with bilinear L violation in the context of
gauge mediated supersymmetric models (GMSB) are discussed in Chapter 4, where
2-loop RGE for the parameter $\Delta B_i$ are presented. Chapter 5 discusses
neutrino mass structure when L violation is through trilinear lepton number
violating terms. Chapter 6 discusses RG enhancement of neutrino masses and
neutrino mass bounds on trilinear lepton number violating couplings in the
context of mSUGRA. Chapter 7 summarises general features of neutrino masses
within these models and contains overall conclusions based on the work
presented in the thesis.
