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Dorsch, G. C.; Huber, S. J.; No, J. M.
The journal of high energy physics, 10/2013, Letnik: 2013, Številka: 10Journal Article
A bstract The nature of the electroweak phase transition in two-Higgs-doublet models is revisited in light of the recent LHC results. A scan over an extensive region of their parameter space is performed, showing that a strongly first-order phase transition favours a light neutral scalar with SM-like properties, together with a heavy pseudo-scalar ( ≳ 400 GeV) and a mass hierarchy in the scalar sector, . We also investigate the h 0 → γγ decay channel and find that an enhancement in the branching ratio is allowed, and in some cases even preferred, when a strongly first-order phase transition is required.
