Problems for supersymmetry breaking by the dilaton in strings from charge and color breaking

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Abstract

The general constraints on the parameter space of soft-breaking terms, in order to avoid dangerous charge and color breaking minima, are applied to the four-dimensional string scenario where the dilaton is the source of supersymmetry breaking (dilaton-dominated limit). The results indicate that the whole parameter space is essentially excluded on these grounds after imposing the present experimental data on the top mass. The inclusion of a non-vanishing cosmological constant does not improve substantially the prospects. Possible way-outs to this situation are briefly discussed.

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    Research supported in part by: the CICYT, under contracts AEN95-0195 (JAC) and AEN93-0673 (ALL, CM); the European Union, under contracts CHRX-CT92-0004 (JAC), CHRX-CT93-0132 (CM) and SC1-CT92-0792 (CM); the Ministerio de Educación y Ciencia, under FPI grant (ALL).

    1

    On leave of absence from Instituto de Estructura de la Materia CSIC, Serrano 123, 28006 Madrid, Spain.

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