https://doi.org/10.1140/epjc/s10052-016-4180-z
Regular Article - Theoretical Physics
Vacuum stability and naturalness in type-II seesaw
1
Graduate School of Science and Engineering, Shimane University, Matsue, 690-8504, Japan
2
Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL, 35487, USA
3
Department of Physics, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
* e-mail: yy@particle.sci.hokudai.ac.jp
Received:
27
January
2016
Accepted:
6
June
2016
Published online:
16
June
2016
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 
triplet scalar field, which could cause a large Higgs mass correction. From the naturalness point of view, heavy Higgs masses should be lower than 
, 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 (
) deviate from the standard model, and a large parameter region is excluded by the recent ATLAS and CMS combined analysis of 
. Our result of the signal strength for is 
, but its deviation is too small to observe at the LHC experiment.
© The Author(s), 2016
