  The discovery of the Higgs boson raises the question of its "lightness" in
mass when the Standard Model is considered as an effective quantum field
theory. Supersymmetry is the only currently known symmetry which can protect
the Higgs mass while still treating the Higgs as an elementary quantum field.
However in the view of null experimental confirmation from both direct (LHC)
and indirect searches (flavour, dark matter) of the supersymmetric particles
and the constraints from the Higgs mass, several possible heavy spectra for
supersymmetric partners have been proposed.
  In the present thesis, we study the possible origins of these heavy spectra
by considering a considering many sequestered spurion fields as carriers of
supersymmetry breaking. We show that "natural" supersymmetric spectrum is
possible in these models and in particular a "coherent" scenario leads to low
fine tuning, light Higgsino mixed dark matter ( a la focus point region) even
with heavy supersymmetric spectrum. We then consider this model within the
context of string landscape, where we use the Bousso-Polchinski framework of
four form fluxes to model the spurions. We show that the flavour violating
parameters of supersymmetric spectrum can be "diluted" away in the presence of
large number of fluxes.
  One of the possible supersymmetric spectra which emerges by considering all
the data is the generation split (Gensplit) spectrum which allows for flavour
violation to be present for the first two generations, which are heavy. We
study this spectrum within the context of supersymmetric SU(5) and proton
decay. The results are quite interesting and dependent on the proton decay mode
considered. The strongest bound p to k \nu is now modified depending on the
flavour of the neutrino and brings the parameter space within the realms of
upcoming experiments of JUNO, DUNE and Hyper K. These results will be
discussed.
