Revisiting fine-tuning in the MSSM

Understand

We evaluate the amount of fine-tuning in constrained versions of the minimal supersymmetric standard model (MSSM), with different boundary conditions at the GUT scale.

• Specifically we study the fully constrained version as well as the cases of non-universal Higgs and gaugino masses.
• We allow for the presence of additional non-holomorphic soft-terms which we show further relax the fine-tuning.
• Of particular importance is the possibility of a Higgsino mass term and we discuss possible origins for such a term in UV complete models.