PUB - Publikationen an der Universität Bielefeld

We study the strength of the electroweak phase transition in models with twolight Higgs doublets and a light SU(3)_c triplet by means of latticesimulations in a dimensionally reduced effective theory. In the parameterregion considered the transition on the lattice is significantly stronger thanindicated by a 2-loop perturbative analysis. Within some ultravioletuncertainties, the finding applies to MSSM with a Higgs mass m_h approximately126 GeV and shows that the parameter region useful for electroweak baryogenesisis enlarged. In particular (even though only dedicated analyses can quantifythe issue), the tension between LHC constraints after the 7 TeV and 8 TeV runsand frameworks where the electroweak phase transition is driven by light stops,seems to be relaxed.