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

2012/11/30 by M. Laine, G. Nardini, K. Rummukainen · 1 citation
Physics and Astronomy · #hep-lat #hep-ph

paper · pdf · doi:10.1088/1475-7516/2013/01/011

22 pages

arxiv created 2012/11/30 · arxiv updated 2015/06/12

Abstract

We carry out lattice simulations of a cosmological electroweak phase transition for a Higgs mass m_h ~ 126 GeV. The analysis is based on a dimensionally reduced effective theory for an MSSM-like scenario including a relatively light coloured SU(2)-singlet scalar, referred to as a right-handed stop. The non-perturbative transition is stronger than in 2-loop perturbation theory, and may offer a window for electroweak baryogenesis. The main remaining uncertainties concern the physical value of the right-handed stop mass which according to our analysis could be as high as m_tR ~ 155 GeV; a more precise effective theory derivation and vacuum renormalization than available at present are needed for confirming this value.

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