A strong electroweak phase transition in the 2HDM after LHC8
  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 (m_A^0 > 400 GeV) and a mass hierarchy in
the scalar sector, m_H^+ < m_H^0 < m_A^0. We also investigate the h^0 -> gamma
gamma 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.
