Some issues in soft SUSY-breaking terms from dilaton/moduli sectors

Details Some issues in soft SUSY-breaking terms from dilaton/moduli sectors Some issues in soft SUSY-breaking terms from dilaton/moduli sectors

1995-08-08

arxiv.org/abs/hep-ph/9508258v2

Z.Phys.C74:157-170,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, no figures, Latex; version to appear in Z. Phys. C (some changes in the discussion on gaugino versus scalar masses i

Scientific paper

10.1007/s002880050379

We study the structure of the soft SUSY-breaking terms obtained from some classes of 4-D strings under the assumption of dilaton/moduli dominance in the process of SUSY-breaking. We generalize previous analysis in several ways and in particular consider the new features appearing when several moduli fields contribute to SUSY breaking (instead of an overall modulus $T$). Some qualitative features indeed change in the multimoduli case.A general discussion for symmetric Abelian orbifolds as well as explicit examples are given. Certain general sum-rules involving soft terms of different particles are shown to apply to large classes of models. Unlike in the overall modulus $T$ case, gauginos may be lighter than scalars even at the tree-level. However, if one insists in getting that pattern of soft terms, these sum rules force some of the scalars to get negative mass$^2$. These tachyonic masses could be a problem for standard model 4-D strings but an advantage in the case of string-GUTs.We also discuss the possible effects of off-diagonal metrics for the matter fields which may give rise to flavour-changing neutral currents. Different sources for the bilinear $B$ soft term are studied. It is found that the Giudice-Masiero mechanism for generating a ``$\mu $-term'', as naturally implemented in orbifolds, leads to the prediction $|tg\beta |=1$ at the string scale, independently of the Goldstino direction.

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