Abstract
We map out possible extensions of the MSSM in the context of type II string theory. We systematically investigate three-stack and four-stack quivers which realize the MSSM spectrum with the addition of a single MSSM singlet S with an allowed SH u H d term, which can lead to a dynamical electroweak-scale μ-term. We present the three quivers which satisfy stringent string-theoretic and phenomenological constraints, including the presence of non-zero masses for all three families of quarks and leptons, the perturbative and non-perturbative absence of R-parity violating couplings and rapid dimension-five proton decay, and a mechanism for small neutrino masses. We find that these quivers can realize many models in the class of singlet-extended (supersymmetric) standard models, as D-instanton effects can in principle generate a superpotential of the form f(S), where f is a polynomial. Finally, we address the issue of the stabilization and decoupling of charged moduli which generically appear in D-instanton corrections to the superpotential.
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Cvetič, M., Halverson, J. & Langacker, P. Singlet extensions of the MSSM in the quiver landscape. J. High Energ. Phys. 2010, 76 (2010). https://doi.org/10.1007/JHEP09(2010)076
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DOI: https://doi.org/10.1007/JHEP09(2010)076