  We study the general patterns of SUSY-breaking soft terms arising under the
assumption of Kahler moduli dominated SUSY-breaking in string theory models.
Insisting that all MSSM gauginos get masses at leading order and that the top
Yukawa coupling is of order the gauge coupling constant identifies the class of
viable models. These are models in which the SM fields live either in the bulk
or at the intersection of local sets of Type IIB D7-branes or their F-theory
relatives. General arguments allow us to compute the dependence of the Kahler
metrics of MSSM fields on the local Kahler modulus of the brane configuration
in the large moduli approximation. We illustrate this study in the case of
toroidal/orbifold orientifolds but discuss how the findings generalize to the
F-theory case which is more naturally compatible with coupling unification.
Only three types of 7-brane configurations are possible, leading each of them
to very constrained patterns of soft terms for the MSSM. We study their
consistency with radiative electroweak symmetry breaking and other
phenomenological constraints. We find that essentially only the configuration
corresponding to intersecting 7-branes is compatible with all present
experimental constraints and the desired abundance of neutralino dark matter.
The obtained MSSM spectrum is very characteristic and could be tested at LHC.
We also study the LHC reach for the discovery of this type of SUSY particle
spectra.
