Abstract
The Georgi-Machacek model predicts the existence of four neutral Higgs bosons, one of which can be identified as the 125-GeV Higgs boson. The latest Higgs data favor the parameter space of small mixing angle α between the two custodial singlets of the model. The other two neutral Higgs bosons belong respectively to the custodial triplet and quintet. We study the general decay and production properties of these particles in the small-α scenario. Constraints on the SU(2) L triplet vacuum expectation value are obtained as a function of the exotic Higgs boson masses using latest ATLAS data of various search channels for additional neutral Higgs bosons.
Highlights
JHEP04(2015)113 bosons, forming two singlets, one triplet, and one quintet under the custodial symmetry [4]
The Georgi-Machacek model predicts the existence of four neutral Higgs bosons, one of which can be identified as the 125-GeV Higgs boson
Due to mixing between the doublet and the triplet fields, the coupling between the SM-like Higgs boson and the weak gauge bosons can be greater than the SM value [11, 17,18,19], which is impossible for models with only extra SU(2)L singlet and/or doublet fields
Summary
When the VEV’s of the two triplet fields are aligned: vχ = vξ ≡ v3, the original SU(2)L×SU(2)R symmetry in the Higgs potential of the model breaks down to the custodial SU(2)V symmetry In this case, the masses of the W and Z bosons have exactly the same form as in the SM: MW2 = g2v2/4 and MZ2 = g2v2/(4 cos θW ), where θW is the weak mixing angle and v2 ≡ vφ2 + 8v32 = (246 GeV). As only the two custodial singlets in the model can possibly couple to both SM fermions and weak bosons simultaneously, we plot in figure 1 the contours of different pairs of scaling factors for the two custodial singlets.
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