The NMSSM and String Theory

Understand

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.