A strong electroweak phase transition in the 2HDM after LHC8

G. C. Dorsch , S. J. Huber , J. M. No

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classification ✦ hep-ph astro-ph.CO

keywords phasetransitionelectroweakfirst-ordergammalightscalarstrongly

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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.

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Electro-Weak Phase Transitions and Collider Signals in the Aligned 2-Higgs Doublet Model
hep-ph 2026-04 unverdicted novelty 5.0

The Aligned 2HDM supports strong first-order electroweak phase transitions that yield LISA-detectable gravitational waves together with LHC-accessible signals from additional neutral and charged Higgs states.