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Title: Vacuum stability and naturalness in type-II seesaw

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.
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:
Grant/Contract Number:
SC0013680; SC 0013680
Type:
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
Research Org:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1257502
Alternate Identifier(s):
OSTI ID: 1361534