Electroweak phase transition in the real triplet extension of the SM: Dimensional reduction

Journal Article · 05 August 2019 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.100.035002 · OSTI ID:1547957

Niemi, Lauri ^[1]; Patel, Hiren H. ^[2]; Ramsey-Musolf, Michael J. ^[2]; Tenkanen, Tuomas V. I. ^[1]; Weir, David J. ^[1]

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1. Univ. of Helsinki (Finland)
2. Univ. of Massachusetts, Amherst, MA (United States)

In a series of two papers, we make a comparative analysis of the performance of conventional perturbation theory to analyze electroweak phase transition in the real triplet extension of the Standard Model (ΣSM). In Part I (this paper), we derive and present the high–T dimensionally reduced effective theory that is suitable for numerical simulation on the lattice. In Part II, we will present results of the numerical simulation and benchmark the performance of conventional perturbation theory. Under the assumption that Σ is heavy, the resulting effective theory takes the same form as that derived from the minimal Standard Model. By recasting the existing nonperturbative results, we map out the phase diagram of the model in the plane of triplet mass M_Σ and Higgs portal coupling a₂. Contrary to conventional perturbation theory, we find regions of parameter space in which the phase transition may be first order, second order, or crossover. We comment on prospects for prospective future colliders to probe the region where the electroweak phase transition is first order by a precise measurement of the h → γγ partial width.

• Research Organization: Univ. of Massachusetts, Amherst, MA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: SC0011095
• OSTI ID: 1547957
• Alternate ID(s): OSTI ID: 1611592
• Journal Information: Physical Review. D., Vol. 100, Issue 3; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English