Strong Electroweak Phase Transition up tomH∼105GeV

Perturbative calculations suggest that the electroweak phase transition in the minimal supersymmetric standard model (MSSM) can be strong enough for baryogenesis for Higgs masses up to $m_H\sim 105$ GeV, provided that the lightest stop mass is in the range 100–160 GeV. We have performed large-scale lattice Monte Carlo simulations of the MSSM electroweak phase transition. We find that the transition is in fact stronger than in perturbation theory. This guarantees that the perturbative mass bounds are conservative ones, and provides a strong motivation for further studies of MSSM baryogenesis.