  This paper develops the computation of soft supersymmetry breaking terms for
chiral D7 matter fields in IIB Calabi-Yau flux compactifications with
stabilised moduli. We determine explicit expressions for soft terms for the
single-modulus KKLT scenario and the multiple-moduli large volume scenario. In
particular we use the chiral matter metrics for Calabi-Yau backgrounds recently
computed in hep-th/0609180. These differ from the better understood metrics for
non-chiral matter and therefore give a different structure of soft terms. The
soft terms take a simple form depending explicitly on the modular weights of
the corresponding matter fields. For the large-volume case we find that in the
simplest D7 brane configuration, scalar masses, gaugino masses and A-terms are
very similar to the dilaton-dominated scenario. Although all soft masses are
suppressed by ln(M_P/m_{3/2}) compared to the gravitino mass, the
anomaly-mediated contributions do not compete, being doubly suppressed and thus
subdominant to the gravity-mediated tree-level terms. Soft terms are
flavour-universal to leading order in an expansion in inverse Kahler moduli.
They also do not introduce extra CP violating phases to the effective action.
We argue that soft term flavour universality should be a property of the
large-volume compactifications, and more generally IIB flux models, in which
flavour is determined by the complex structure moduli while supersymmetry is
broken by the Kahler moduli. For the simplest large-volume case we run the soft
terms to low energies and present some sample spectra and a basic
phenomenological analysis.

High Energy Physics - Theory;High Energy Physics - Phenomenology