Charge and colour breaking minima and constraints on the MSSM parameters
نویسندگان
چکیده
منابع مشابه
Charge and color breaking minima and constraints on the MSSM parameters
The MSSM potential can have unphysical minima deeper than the physically acceptable one. We point out that their presence is quite generic in SO(10) unification with supergravity mediated soft terms. However, at least for moderate values of tanβ, the physically acceptable vacuum has a life-time longer than the universe age. Furthermore, by discussing the evolution of the universe in an inflatio...
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A generic feature of theories with (softly broken) supersymmetry is a scalar potential, V (φ), that depends on a large number of scalar fields φ = (φ1, ..., φn). For this reason, the scalar potential of the MSSM, unlike that of the Standard Model, may have a number of local minima characterized by different gauge symmetries. In particular, the supersymmetric partners of quarks, Q̃ L and q̃ R , ma...
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We examine charge/colour breaking along directions in supersymmetric field space which are F andD-flat. We catalogue the dangerous directions and include some new ones which have not previously been considered. Analytic expressions for the resulting constraints are provided which are valid for all patterns of supersymmetry breaking. As an example we consider a recently proposed pattern of super...
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We study the constraints on the parameter space of the supersymmetric standard model extended by a gauge singlet, which arise from the absence of global minima of the effective potential with slepton or squark vevs. Particular attention is paid to the so-called “UFB” directions in field space, which are F -flat in the MSSM. Although these directions are no longer F -flat in the (M+1)SSM, we sho...
متن کاملPhase transitions and vacuum tunneling into charge- and color-breaking minima in the MSSM.
The scalar potential of the MSSM may have local and global minima characterized by non-zero expectation values of charged and colored bosons. Even if the true vacuum is not color and charge conserving, the early Universe is likely to occupy the minimum of the potential in which only the neutral Higgs fields have non-zero vev’s. The stability of this false vacuum with respect to quantum tunnelin...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1996
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(96)00554-8