TY - JOUR
T1 - Loop effects on the Higgs decay widths in extended Higgs models
AU - Kanemura, Shinya
AU - Kikuchi, Mariko
AU - Mawatari, Kentarou
AU - Sakurai, Kodai
AU - Yagyu, Kei
N1 - Funding Information:
The work of S.K. was supported, in part, by Grant-in-Aid for Scientific Research on Innovative Areas, the Ministry of Education, Culture, Sports, Science and Technology , No. 16H06492 , Grant H2020-MSCA-RISE-2014 No. 645722 (Non-Minimal Higgs), and JSPS Joint Research Projects (Collaboration, Open Partnership) “New Frontier of neutrino mass generation mechanisms via Higgs physics at LHC and flavour physics”.
Publisher Copyright:
© 2018 The Author(s)
PY - 2018/8/10
Y1 - 2018/8/10
N2 - In order to identify the Higgs sector using future precision data, we calculate the partial decay widths of the discovered Higgs boson with the mass of 125 GeV into fermion pairs and gauge-boson pairs with one-loop electroweak and one-loop QCD corrections in various extended Higgs models, such as the Higgs singlet model and four types of two Higgs doublet models. In the tree-level analysis, the patterns of deviations from the standard model predictions in the partial decay widths for various decay modes are distinctive for each model, due to the mixing of the Higgs boson with other neutral scalars. Our present analysis shows that even with a full set of radiative corrections we can discriminate these extended Higgs models via the partial decay widths as long as any of the deviations is detected at future precision measurements. Furthermore, we quantitatively show that in each model the magnitude of the deviations can provide important information on the mass scale of extra Higgs bosons under the theoretical constraints from perturbative unitary and vacuum stability, which can be obtained without discovery of the additional Higgs bosons.
AB - In order to identify the Higgs sector using future precision data, we calculate the partial decay widths of the discovered Higgs boson with the mass of 125 GeV into fermion pairs and gauge-boson pairs with one-loop electroweak and one-loop QCD corrections in various extended Higgs models, such as the Higgs singlet model and four types of two Higgs doublet models. In the tree-level analysis, the patterns of deviations from the standard model predictions in the partial decay widths for various decay modes are distinctive for each model, due to the mixing of the Higgs boson with other neutral scalars. Our present analysis shows that even with a full set of radiative corrections we can discriminate these extended Higgs models via the partial decay widths as long as any of the deviations is detected at future precision measurements. Furthermore, we quantitatively show that in each model the magnitude of the deviations can provide important information on the mass scale of extra Higgs bosons under the theoretical constraints from perturbative unitary and vacuum stability, which can be obtained without discovery of the additional Higgs bosons.
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U2 - 10.1016/j.physletb.2018.06.035
DO - 10.1016/j.physletb.2018.06.035
M3 - Article
AN - SCOPUS:85049355445
VL - 783
SP - 140
EP - 149
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -