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Arsham Farzinnia
순수물리이론 연구단
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Strongly first-order electroweak phase transition and classical scale invariance

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Title
Strongly first-order electroweak phase transition and classical scale invariance
Author(s)
Arsham Farzinnia; Ren, J
Publication Date
2014-10
Journal
PHYSICAL REVIEW D, v.90, no.7, pp.075012 -
Publisher
AMER PHYSICAL SOC
Abstract
In this work, we examine the possibility of realizing a strongly rst-order electroweak phase transi- tion within the minimal classically scale invariant extension of the standard model (SM), previously proposed and analyzed as a potential solution to the hierarchy problem. By introducing one com- plex gauge-singlet scalar and three (weak scale) right-handed Majorana neutrinos, the scenario was successfully capable of achieving a radiative breaking of the electroweak symmetry (by means of the Coleman-Weinberg Mechanism), inducing non-zero masses for the SM neutrinos (via the seesaw mechanism), presenting a pseudoscalar dark matter candidate (protected by the CP symmetry of the potential), and predicting the existence of a second CP-even boson (with suppressed couplings to the SM content) in addition to the 125 GeV scalar. In the present treatment, we construct the full nite-temperature one-loop eective potential of the model, including the resummed thermal daisy loops, and demonstrate that nite-temperature eects induce a rst-order electroweak phase transition. Requiring the thermally-driven rst-order phase transition to be suciently strong at the onset of the bubble nucleation (corresponding to nucleation temperatures TN 100-200 GeV) further constrains the model's parameter space; in particular, an O(0:01) fraction of the dark matter in the universe may be simultaneously accommodated with a strongly rst-order electroweak phase transition. Moreover, such a phase transition disfavors right-handed Majorana neutrino masses above several hundreds of GeV, connes the pseudoscalar dark matter masses to 1-2 TeV, pre- dicts the mass of the second CP-even scalar to be 100-300 GeV, and requires the mixing angle between the CP-even components of the SM doublet and the complex singlet to lie within the range 0:2 . sin ! . 0:4. The obtained results are displayed in comprehensive exclusion plots, identifying the viable regions of the parameter space. Many of these predictions lie within the reach of the next LHC run.
URI
http://pr.ibs.re.kr/handle/8788114/1458
DOI
10.1103/PhysRevD.90.075012
ISSN
1550-7998
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
Files in This Item:
PhysRevD.90-strongly.pdfDownload

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