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We carry out lattice simulations of a cosmological electroweak phasetransition for a Higgs mass m_h ~ 126 GeV. The analysis is based on adimensionally reduced effective theory for an MSSM-like scenario including arelatively light coloured SU(2)-singlet scalar, referred to as a right-handedstop. The non-perturbative transition is stronger than in 2-loop perturbationtheory, and may offer a window for electroweak baryogenesis. The main remaininguncertainties concern the physical value of the right-handed stop mass whichaccording to our analysis could be as high as m_tR ~ 155 GeV; a more preciseeffective theory derivation and vacuum renormalization than available atpresent are needed for confirming this value.

Lattice study of an electroweak phase transition at m_h ~ 126 GeV