Probing μ-term generation mechanism in string models

Kawamura, Yoshiharu; Kobayashi, Tatsuo; Watanabe, Manabu

doi:10.1016/s0370-2693(97)01256-2

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…It is conceivable that the µ-term receives significant supergravity radiative corrections which may produce µ of the right size [34]. We note that the above considered mechanisms make it difficult to achieve radiative electroweak symmetry breaking [35].…”

Section: Patterns Of the Minimamentioning

confidence: 84%

Towards a Realistic Picture of CP Violation in Heterotic String Models

Lebedev¹,

Morris²

2002

J. High Energy Phys.

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We find that dilaton dominated supersymmetry breaking and spontaneous CP violation can be achieved in heterotic string models with superpotentials singular at the fixed points of the modular group. A semi-realistic picture of CP violation emerges in such models: the CKM phase appears due to a complex VEV of the T -modulus, while the soft supersymmetric CP phases are absent due to an axionic-type symmetry.

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Section: Patterns Of the Minimamentioning

confidence: 84%

Towards a Realistic Picture of CP Violation in Heterotic String Models

Lebedev¹,

Morris²

2002

J. High Energy Phys.

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Superstring theory andCP-violating phases: Can they be related?

et al. 2000

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We investigate the possibility of large CP-violating phases in the soft breaking terms derived in superstring models. The bounds on the electric dipole moments (EDM's) of the electron and neutron are satisfied through cancellations occuring because of the structure of the string models. Three general classes of four-dimensional string models are considered: (i) orbifold compactifications of perturbative heterotic string theory, (ii) scenarios based on Hořava-Witten theory, and (iii) Type I string models (Type IIB orientifolds). Nonuniversal phases of the gaugino mass parameters greatly facilitate the necessary cancellations among the various contributions to the EDM's; in the overall modulus limit, the gaugino masses are universal at tree level in both the perturbative heterotic models and the Hořava-Witten scenarios, which severely restricts the allowed regions of parameter space. Nonuniversal gaugino masses do arise at one-loop in the heterotic orbifold models, providing for corners of parameter space with O(1) phases consistent with the phenomenological bounds. However, there is a possibility of nonuniversal gaugino masses at tree level in the Type I models, depending on the details of the embedding of the SM into the D-brane sectors. We find that in a minimal model with a particular embedding of the Standard Model gauge group into two D-brane sectors, viable large phase solutions can be obtained over a wide range of parameter space.

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Bottom-Up Approach to B-Parameter in Minimal Supersymmetric Standard Model

Kawamura

Kobayashi

Watanabe

2000

Int. J. Mod. Phys. A

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We study µ and B-parameters in the minimal supersymmetric standard model (MSSM) based on the radiative electroweak symmetry breaking scenario using "bottom-up" approach and show how useful our approach is to select a phenomenologically viable model beyond the MSSM under the assumption that the underlying theory is a string model or a gauge-Yukawa unified gauge model.1 * In GYU model, the relation between the B-parameter and other soft SUSY breaking parameters is determined by the use of the coupling reduction procedure independent of the µ-term generation mechanism.† In [17], qualitative properties of the high-energy parameter space are discussed using bottom-up approach, but the comparison with the prediction of specific models, e.g. string

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Probing μ-term generation mechanism in string models

Cited by 3 publications

References 31 publications

Towards a Realistic Picture of CP Violation in Heterotic String Models

Towards a Realistic Picture of CP Violation in Heterotic String Models

Superstring theory andCP-violating phases: Can they be related?

Bottom-Up Approach to B-Parameter in Minimal Supersymmetric Standard Model

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