We perform a systematic analysis of soft supersymmetry breaking terms at theone loop level in a large class of string effective field theories. Thisincludes the so-called anomaly mediated contributions. We illustrate ourresults for several classes of orbifold models. In particular, we discuss aclass of models where soft supersymmetry breaking terms are determined by quasimodel independent anomaly mediated contributions, with possibly non-vanishingscalar masses at the one loop level. We show that the latter contributiondepends on the detailed prescription of the regularization process which isassumed to represent the Planck scale physics of the underlying fundamentaltheory. The usual anomaly mediation case with vanishing scalar masses at oneloop is not found to be generic. However gaugino masses and A-terms alwaysvanish at tree level if supersymmetry breaking is moduli dominated with themoduli stabilized at self-dual points, whereas the vanishing of the B-termdepends on the origin of the mu-term in the underlying theory. We also discussthe supersymmetric spectrum of O-I and O-II models, as well as a model ofgaugino condensation. For reference, explicit spectra corresponding to a Higgsmass of 114 GeV are given. Finally, we address general strategies fordistinguishing among these models.
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