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26 April 2024 |
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The SM extension with color-octet scalars: diphoton enhancement and global fit of LHC Higgs data | | Junjie Cao
; Peihua Wan
; Jin Min Yang
; Jingya Zhu
; | | Date: |
11 Mar 2013 | | Abstract: | In light of the significant progress of the LHC to determine the properties
of the Higgs boson, we investigate the capability of the Manohar-Wise model to
explain the Higgs data. This model extends the SM by one family of color-octet
and isospin-doublet scalars, and it can sizably alter the coupling strengths of
the Higgs boson with gluons and photons. We first examine the current
constraints on the model, which are from unitarity, the LHC searches for the
scalars and the electroweak precision data (EWPD). Then in the allowed
parameter space we perform a fit of the model using the latest Higgs data. From
our analysis we obtain three main observations. The first is that in its broad
parameter region this model is better than the SM in explaining the data.
Especially, the best-fit points can be achieved for the charged color-octet
scalar in the range of 300-750 GeV. The second is that the current Higgs data
can stringently constrain the parameter space of this model, which, combined
with the EWPD, strongly prefer the degeneracy of the charged scalar with the
color-octet CP-odd scalar and also restrain the parameter lambda_1 within a
narrow region. And the last is that the best-fit points predict the couplings
(normalized to the SM values): C_{hgg}/SM=-0.92, C_{hgammagamma}/SM=1.42 and
C_{hZgamma}/SM=1.16. | | Source: | arXiv, 1303.2426 | | Services: | Forum | Review | PDF | Favorites | |
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