SOME PHENOMENOLOGICAL IMPLICATIONS OF STRING LOOP EFFECTS

Authors
Citation
J. Louis et Y. Nir, SOME PHENOMENOLOGICAL IMPLICATIONS OF STRING LOOP EFFECTS, Nuclear physics. B, 447(1), 1995, pp. 18-34
Citations number
73
Categorie Soggetti
Physics, Nuclear
Journal title
ISSN journal
05503213
Volume
447
Issue
1
Year of publication
1995
Pages
18 - 34
Database
ISI
SICI code
0550-3213(1995)447:1<18:SPIOSL>2.0.ZU;2-7
Abstract
We investigate low energy implications of string loop corrections to s upergravity couplings which break a possible flavor universality of th e tree level. If supersymmetry is broken by the dilaton F-term, univer sal soft scalar masses arise at the leading order but string loop corr ections generically induce flavor-non-diagonal soft terms. Constraints from flavor changing neutral currents (FCNC) and CP violation then re quire a large supersymmetry 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 t he Kahler potential. A large hierarchy between the gluino and squark m asses ensures that FCNC and CP-violation constraints are satisfied. If the soft scalar masses vanish at the string tree level, the cosmologi cal problems related to light moduli can be evaded. However, generic s tring loop corrections violate FCNC bounds and require very heavy squa rk masses (approximate to 100 TeV).