Electroweak phase transition with spontaneous Z 2-breaking

Marcela Carena, Zhen Liu, Yikun Wang

Research output: Contribution to journalArticlepeer-review


This work investigates a simple, representative extension of the Standard Model with a real scalar singlet and spontaneous Z2 breaking, which allows for a strongly first-order phase transition, as required by electroweak baryogenesis. We perform analytical and numerical calculations that systematically include one-loop thermal effects, Coleman-Weinberg corrections, and daisy resummation, as well as evaluation of bubble nucleation. We study the rich thermal history and identify the conditions for a strongly first-order electroweak phase transition with nearly degenerate extrema at zero temperature. This requires a light scalar with mass below 50 GeV. Exotic Higgs decays, as well as Higgs coupling precision measurements at the LHC and future collider facilities, will test this model. Additional information may be obtained from future collider constraints on the Higgs self-coupling. Gravitational-wave signals are typically too low to be probed by future gravitational wave experiments.

Original languageEnglish (US)
Article number107
JournalJournal of High Energy Physics
Issue number8
StatePublished - Aug 1 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).


  • Beyond Standard Model
  • Higgs Physics


Dive into the research topics of 'Electroweak phase transition with spontaneous Z <sub>2</sub>-breaking'. Together they form a unique fingerprint.

Cite this