Work

Two-step electroweak symmetry-breaking: theory meets experiment

Year: 2024

Type: article

Abstract: We study the phenomenology of a hypercharge-zero SU(2) triplet scalar whose existence is motivated by two-step electroweak symmetry-breaking. We consider both the possibility that the triplets are stable and contribute to the dark matter density, or that they decay via mixing with the standard model Higgs boson. The former is constrained by disappearing charged track searches at the LHC and by dark matter direct detection experiments, while the latter is constrained by existing multilepton collider searches. We find that a two-step electroweak phase transition involving a stable triplet with a negative quadratic term is ruled out by direct detection searches, while an unstable triplet with a mass less than 230 GeV is excluded at 95% confidence level.

Source: OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)

DOI: 10.1007/jhep05%282020%29050

Author: Bell, Nicole F. [Univ. of Melbourne (Australia). School of Physics. ARC Centre of Excellence for Particle Physics at the Terascale]; Dolan, Matthew J. [Univ. of Melbourne (Australia). School of Physics. ARC Centre of Excellence for Particle Physics at the Terascale]; Friedrich, Leon S. [Univ. of Melbourne (Australia). School of Physics. ARC Centre of Excellence for Particle Physics at the Terascale]; Ramsey-Musolf, Michael J. [Univ. of Massachusetts, Amherst, MA (United States). Dept. of Physics

Institutions: The University of Melbourne, ARC Centre of Excellence for Particle Physics at the Terascale

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, National Natural Science Foundation of China

Awards: FUNDAMENTAL INTERACTIONS IN NUCLEI, G5993233886