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Vacuum stability and naturalness in type-II seesaw

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Title: Vacuum stability and naturalness in type-II seesaw
Authors: Haba, Naoyuki Browse this author
Ishida, Hiroyuki Browse this author
Okada, Nobuchika Browse this author
Yamaguchi, Yuya Browse this author
Issue Date: 17-Jun-2016
Publisher: Springer
Journal Title: The European physical journal. C, Particles and fields
Volume: 76
Issue: 6
Start Page: 333
Publisher DOI: 10.1140/epjc/s10052-016-4180-z
Abstract: We study the vacuum stability and perturbativity conditions in theminimal type-II seesawmodel. These conditions give characteristic constraints to the model parameters. In the model, there is a SU(2)(L) triplet scalar field, which could cause a large Higgs mass correction. From the naturalness point of view, heavy Higgs masses should be lower than 350 GeV, which may be testable by the LHC Run-II results. Due to the effects of the triplet scalar field, the branching ratios of the Higgs decay (h -> gamma gamma, Z gamma) deviate from the standard model, and a large parameter region is excluded by the recent ATLAS and CMS combined analysis of h -> gamma gamma. Our result of the signal strength for h -> gamma gamma is R-gamma gamma less than or similar to 1.1, but its deviation is too small to observe at the LHC experiment.
Rights: The final publication is available at
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山口 雄也

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