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arxiv: 0912.0477 · v2 · submitted 2009-12-02 · ✦ hep-ph · hep-th

The NMSSM and String Theory

classification ✦ hep-ph hep-th
keywords nmssmstringheteroticlightpeccei-quinnsingletapproximatecase
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We study the possibility of constructing the NMSSM from the heterotic string. String derived NMSSMs are much more rare than MSSMs due to the extra requirement that there exist a light singlet which couples to the Higgs pairs. They share the common feature that the singlet self-interactions are typically suppressed, leading to either the "decoupling" or the Peccei-Quinn limit of the NMSSM. In the latter case, the spectrum contains a light pseudoscalar which may be relevant to the MSSM fine-tuning problem. We provide a Z_6 heterotic orbifold example of the NMSSM with approximate Peccei-Quinn symmetry, whose origin lies in the string selection rules combined with our choice of the vacuum configuration.

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