More about soft terms and FCNC in realistic string constructions

Details More about soft terms and FCNC in realistic string constructions More about soft terms and FCNC in realistic string constructions

2005-08-29

arxiv.org/abs/hep-ph/0508286v2

JHEP 0601 (2006) 044

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, latex. Misprints corrected

Scientific paper

10.1088/1126-6708/2006/01/044

In realistic four-dimensional string constructions the presence of anomalous U(1)'s is generic. In addition, the associated Fayet-Iliopoulos contribution to the D-term can break the extra gauge symmetries. As a consequence, physical particles can appear combined with other states. We show that even if a three-generation standard-like model has originally flavour-independent soft scalar masses, the particle mixing contribution may generate non-universality among them. Thus FCNC effects which were apparently absent reappear. We also discuss the size of these contributions in an explicit model, and how they can be suppressed.

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