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arXiv · 1812.06217

Electroweak phase transition and Higgs phenomenology in the Georgi-Machacek model

Ruiyu Zhou·Wei Cheng·Xin Deng·Ligong Bian·Yongcheng Wu
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Abstract

In this work, we perform the electroweak phase transition study with the Georgi-Machacek model. We investigate both the one-step and two-step strong first order electroweak phase transition (SFOEWPT). The SFOEWPT viable parameter spaces could be tested by the future 14 TeV LHC, HL-LHC, and ILC. The LHC Higgs signal strength measurements severely bound the SFOEWPT valid parameter spaces, a tinny region of the mixing angle between the neutral fields of the isospin-doublet and isospin-triplet scalars around $\alpha\sim 0$ can allow the two-step SFOEWPT to occur. The triplet vacuum expectation value (VEV) is crucial for both SFOEWPT and related Higgs phenomenology. The two-step SFOEWPT can be distinguished from the one-step SFOEWPT through the triple Higgs coupling searches and the low mass doubly charged Higgs searches at colliders.

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Ruiyu Zhou, Wei Cheng, Xin Deng, Ligong Bian, Yongcheng Wu. 2018-12-15. Electroweak phase transition and Higgs phenomenology in the Georgi-Machacek model. https://doi.org/10.1007/jhep01(2019)216

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