new developments in models with explicit bilinear R–parity breaking have been presented [@Diaz:2005ii]. The bilinear terms $  \epsilon_i \hat{L}_i\hat{H}_u$ in the superpotential ($\hat{H}_u,\hat{L}$ are the Higgs and left–handed lepton superfields) induce mixing between the neutralinos and neutrinos, forming a $7\times7$ mass matrix [@Diaz:1997xc]. Thus the model provides a framework for generating neutrino masses and mixing angles, but at the expense that the LSP is no longer stable. For example, fig. \[fig:beyond\](b) shows the $m_0$-$m_{1/2}$ parameter space in the ${\slash\hspace{-2.5mm}{R}_{p}}$-mSUGRA model consistent with neutrino physics. The model leads to definite predictions for the branching ratios of superparticles which can be tested at future colliders.

Gauge theories with extra dimensions provide an exciting possibility of unifying gauge and Higgs fields. The higher dimensional components of gauge fields become scalar fields below the compactification scale and are identified with the Higgs fields in the gauge-Higgs unification theory. Through quantum corrections, the Higgs can take a vacuum expectation value, and its mass is induced, however the radiatively induced mass tends to be small. Exploiting useful expansion formulae for the effective potential it was shown [@Haba:2004bh] that even a small number of bulk field can generate the suitable heavy Higgs mass. The case of introducing 