Some Phenomenological Implications of String Loop Effects

Details Some Phenomenological Implications of String Loop Effects Some Phenomenological Implications of String Loop Effects

1994-11-30

arxiv.org/abs/hep-ph/9411429v1

Nucl.Phys.B447:18-34,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, phyzzx, no figures

Scientific paper

10.1016/0550-3213(95)00155-L

We investigate low energy implications of string loop corrections to supergravity couplings which break a possible flavor universality of the tree level. If Supersymmetry is broken by the dilaton $F$-term, universal soft scalar masses arise at the leading order but string loop corrections generically induce flavor-non-diagonal soft terms. Constraints from flavor changing neutral currents (FCNC) and CP violation then require a large supersymmtery breaking scale and thus heavy gluinos and squarks. If Supersymmetry is broken by moduli $F$-terms, universality at the string tree level can only be guaranteed by extra conditions on the K\"ahler potential. A large hierarchy between the gluino and squark masses ensures that FCNC and CP violation constraints are satisfied. If the soft scalar masses vanish at the string tree level, the cosmological problems related to light moduli can be evaded. However, generic string loop corrections violate FCNC bounds and require very heavy squark masses ($\approx 100\, TeV$).

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