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Soft susy breaking, dilaton domination and intermediate scale string models

Abel, S.A.; Allanach, B.C.; Quevedo, F.; Ibáñez, L.; Klein, M.


B.C. Allanach

F. Quevedo

L. Ibáñez

M. Klein


We present an analysis of the low-energy implications of an intermediate scale ~10^{11} GeV string theory. We mainly focus on the evolution of the physical parameters under the renormalisation group equations (RGEs) and find several interesting new features that differ from the standard GUT scale or Planck scale scenarios. We give a general discussion of soft supersymmetry breaking terms in type I theories and then investigate the renormalization group running. In the dilaton domination scenario, we present the sparticle spectra, analyzing constraints from charge and colour breaking, fine tuning and radiative electroweak symmetry breaking. We compare with the allowed regions of parameter space when the RGEs start running at the standard GUT or the intermediate scales, and find quite remarkably that the dilaton dominated supersymmetry breaking scenario, which is essentially ruled out from constraints on charge and colour breaking if the fundamental scale is close to the Planck mass, is allowed in a large region of parameter space if the fundamental scale is intermediate.


Abel, S., Allanach, B., Quevedo, F., Ibáñez, L., & Klein, M. (2000). Soft susy breaking, dilaton domination and intermediate scale string models. Journal of High Energy Physics, 2000(12),

Journal Article Type Article
Online Publication Date Jan 22, 2001
Publication Date Dec 1, 2000
Deposit Date Apr 24, 2007
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Electronic ISSN 1029-8479
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2000
Issue 12
Keywords Supersymmetry breaking, Beyond standard model, Supersymmetric standard model, Compactification and string models.
Publisher URL