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Title: Vacuum stability and naturalness in type-II seesaw

Abstract

Here, we study the vacuum stability and perturbativity conditions in the minimal type-II seesaw model. 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 350GeV, 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 → γγ,Zγ) deviate from the standard model, and a large parameter region is excluded by the recent ATLAS and CMS combined analysis of h → γγ. Our result of the signal strength for h → γγ is R γγ ≲ 1.1, but its deviation is too small to observe at the LHC experiment.

Authors:
 [1];  [1];  [2]; ORCiD logo [3]
  1. Shimane Univ., Matsue (Japan)
  2. Univ. of Alabama, Tuscaloosa, AL (United States)
  3. Shimane Univ., Matsue (Japan); Hokkaido Univ., Sapporo (Japan)
Publication Date:
Research Org.:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1257502
Alternate Identifier(s):
OSTI ID: 1361534; OSTI ID: 1365623
Grant/Contract Number:  
SC0013680
Resource Type:
Journal Article: Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 6; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Haba, Naoyuki, Ishida, Hiroyuki, Okada, Nobuchika, and Yamaguchi, Yuya. Vacuum stability and naturalness in type-II seesaw. United States: N. p., 2016. Web. doi:10.1140/epjc/s10052-016-4180-z.
Haba, Naoyuki, Ishida, Hiroyuki, Okada, Nobuchika, & Yamaguchi, Yuya. Vacuum stability and naturalness in type-II seesaw. United States. doi:10.1140/epjc/s10052-016-4180-z.
Haba, Naoyuki, Ishida, Hiroyuki, Okada, Nobuchika, and Yamaguchi, Yuya. Thu . "Vacuum stability and naturalness in type-II seesaw". United States. doi:10.1140/epjc/s10052-016-4180-z.
@article{osti_1257502,
title = {Vacuum stability and naturalness in type-II seesaw},
author = {Haba, Naoyuki and Ishida, Hiroyuki and Okada, Nobuchika and Yamaguchi, Yuya},
abstractNote = {Here, we study the vacuum stability and perturbativity conditions in the minimal type-II seesaw model. 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 350GeV, 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 → γγ,Zγ) deviate from the standard model, and a large parameter region is excluded by the recent ATLAS and CMS combined analysis of h → γγ. Our result of the signal strength for h → γγ is Rγγ ≲ 1.1, but its deviation is too small to observe at the LHC experiment.},
doi = {10.1140/epjc/s10052-016-4180-z},
journal = {European Physical Journal. C, Particles and Fields},
number = 6,
volume = 76,
place = {United States},
year = {Thu Jun 16 00:00:00 EDT 2016},
month = {Thu Jun 16 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1140/epjc/s10052-016-4180-z

Citation Metrics:
Cited by: 7 works
Citation information provided by
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