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Published June 1, 2020 | Published
Journal Article Open

Exotic Higgs boson decays and the electroweak phase transition


Light new physics weakly coupled to the Higgs can induce a strong first-order electroweak phase transition (EWPT). Here, we argue that scenarios in which the EWPT is driven first-order by a light scalar with mass between ∼10 GeV − m_h/2 and small mixing with the Higgs will be conclusively probed by the high-luminosity LHC and future Higgs factories. Our arguments are based on analytic and numerical studies of the finite-temperature effective potential and provide a well-motivated target for exotic Higgs decay searches at the LHC and future lepton colliders.

Additional Information

© 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. (Received 27 January 2020; accepted 11 May 2020; published 25 June 2020) We thank Marcela Carena, Zhen Liu, and Yikun Wang for useful discussions of their work in a related scenario. We also thank Aqil Sajjad for collaboration in the early stages of this project. The work of J. K. was supported by Department of Energy (DOE) Grant No. DE-SC0019195 and National Science Foundation (NSF) Grant No. PHY-1719642. M. J. R. M. was supported in part under U.S. Department of Energy Contract No. DE-SC0011095. The work of J. S. is supported by DOE Early Career Grant No. DE-SC0017840. The authors performed this work in part at the Aspen Center for Physics, which is supported by NSF Grant No. PHY-1607611.

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