New Constraints on Superpartner Masses

摘要: We consider the Minimal Supersymmetric Standard Model (MSSM) without imposing relations on superpartner masses that arise in grand unified theories. Given an arbitrary pattern of (consistent with experimental constraints), it may happen scalar potential is actually unstable, even though all masses-squared are positive at weak scale $M_W$. This most likely to if running mass-squared a ``flat'' direction field space becomes negative some $Q_0$ which well below GUT scale. In this case, either ruled out, or there must be new physics (beyond MSSM) $Q_0$.