Intermediate Scales, Mu Parameter, and Fermion Masses from String Models

Details Intermediate Scales, Mu Parameter, and Fermion Masses from String Models Intermediate Scales, Mu Parameter, and Fermion Masses from String Models

1997-05-22

arxiv.org/abs/hep-ph/9705391v4

Phys.Rev.D57:2701-2715,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, standard latex, corrections to relative coupling strengths in eqs. A3-A6 and related effects in Tables I-III & discu

Scientific paper

10.1103/PhysRevD.57.2701

We address intermediate scales within a class of string models. The intermediate scales occur due to the SM singlets S_i acquiring non-zero VEVs due to radiative breaking; the mass-square (m_i)^2 of S_i is driven negative at mu_{RAD} due to order(1) Yukawa couplings of S_i to exotic particles (calculable in a class of string models). The actual VEV of S_i depends on the relative magnitude of the non-renormalizable terms of the type (S_i)^{K+3}/M^K in the superpotential. We mainly consider the case in which the S_i are charged under an additional non-anomalous U(1) gauge symmetry and the VEVs occur along F- and D-flat directions. We explore various scenarios in detail, depending on the type of Yukawa couplings to the exotic particles and on the initial boundary values of the soft SUSY breaking parameters. We then address the implications of these scenarios for the mu parameter and the fermionic masses of the standard model.

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