Higgs phenomenology in the Minimal Dilaton Model after Run I of the LHC

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Abstract:We investigate the Higgs-strahlung production process e + e − → Zh at the future Higgs factory such as TLEP by including radiative corrections in the Minimal Dilaton Model (MDM), which extends the SM by one singlet scalar called dilaton. We consider various theoretical and experimental constraints on the model, and perform fits to the Higgs data taken from ATLAS, CMS and CDF+D0. Then for the 1σ surviving samples, we calculate the MDM predictions on the inclusive production rate σ(e + e − → Zh) at the 240-GeV Higgs factory, and also the signal rates of e + e − → Zh with the Higgs boson decaying to bb and γγ. We have following observations: (1) In the heavy dilaton scenario, the deviation of σ(e + e − → Zh) from its SM prediction can vary from −15% to 85%, which mainly arises from the modification of the tree-level hZZ coupling and also the radiative correction induced by possibly large Higgs self-couplings. (2) The processes e + e − → Zh at the Higgs factory and pp → hh at 14-TeV LHC are complementary in limiting the MDM parameter space. Requiring the deviation of σ(e + e − → Zh) from its SM prediction to be less than 1% and that of σ(pp → hh) to be less than 50%, tan θ S in the MDM will be limited to be −0.1 < tan θ S < 0.3, and the deviations of the signal rates are constrained to be |R bb | < 2% and |R γγ | < 7%. Especially, the Higgs self-coupling normalized to its SM prediction is now upper bounded by about 4. (3) In the light dilaton scenario, the deviation of σ(e + e − → Zh) may reach −7%, and requiring its size to be less than 1% will result in 0 < tan θ S < 0.1, and −10% < R bb , R γγ < 1%.

Section: Calculations and Numerical Resultsmentioning

confidence: 99%

Section: Numerical Results In the Heavy Dilaton Scenariomentioning

confidence: 99%

Section: Jhep08(2014)138mentioning

confidence: 99%

“…For both the light and heavy dilation scenarios, we consider the constraints similar to what we did in [44], which are given by…”

Section: Jhep08(2014)138mentioning

confidence: 99%

“…If θ S , f and physical masses m h , m s are taken as the input of the theory, one can re-express the dimensionless parameters λ S , κ and λ H as follows [44] …”

Section: Jhep08(2014)138mentioning

confidence: 99%

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Higgs-strahlung production process e + e − → Zh at the future Higgs factory in the Minimal Dilaton Model

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Pair production of 125 GeV Higgs boson in the SM extension with color-octet scalars at the LHC

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Zhang

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Status of the aligned two-Higgs-doublet model confronted with the Higgs data

Wang

Han

2014

Imposing the theoretical constraints from vacuum stability, unitarity and perturbativity as well as the experimental constraints from the electroweak precision data, flavor observables and the non-observation of additional Higgs at collider, we study the implications of available Higgs signals on a two-Higgs-doublet model with the alignment of the down-type quarks and charged lepton Yukawa coupling matrices. Compared to the four traditional types of two-Higgs-doublet models, the model has two additional mixing angles θ d and θ l in the down-type quark and charged lepton Yukawa interactions. We find that the mixing angle θ d can loose the constraints on sin(β − α), tan β and m H ± sizably. The model can provide the marginally better fit to available Higgs signals data than SM, which requires the Higgs couplings with gauge bosons, uū and dd to be properly suppressed, and favors (1 < θ d < 2, 0.5 < θ l < 2.2) for m h = 125.5 GeV and (0.5 < θ d < 2, 0.5 < θ l < 2.2) for m H = 125.5 GeV. However, these Higgs couplings are allowed to have sizable deviations from SM for (m h = 125.5 GeV, 125.5 ≤ m H ≤ 128 GeV) and (125 GeV ≤ m h ≤ 125.5 GeV, m H = 125.5 GeV).