Higgs physics at the CLIC electron–positron linear collider

We revisit the ALP miracle scenario where the inflaton and dark matter are unified by a single axion-like particle (ALP). We first extend our previous analysis on the inflaton dynamics to identify the whole viable parameter space consistent with the CMB observation. Then, we evaluate the relic density of the ALP dark matter by incorporating uncertainties of the model-dependent couplings to the weak gauge bosons as well as the dissipation effect. The preferred ranges of the ALP mass and coupling to photons are found to be 0.01 m φ 1 eV and g φγγ = O(10 −11 ) GeV −1 , which slightly depend on these uncertainties. Interestingly, the preferred regions are within reach of future solar axion helioscope experiments, IAXO and TASTE, and laser-based stimulated photon-photon collider experiments. We also discuss possible extensions of the ALP miracle scenario by introducing interactions of the ALP with fermions.

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“…[79][80][81]). Also it can be searched for in the future lepton colliders such as CEPC, ILC, FCC-ee, and CLIC [82][83][84][85][86].…”

Section: Discussionmentioning

confidence: 99%

The ALP miracle revisited

Daido¹,

Takahashi²,

Yin³

2018

J. High Energ. Phys.

100

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“…The different CLIC runs would operate at √ s =380 GeV, 1.4 TeV and 3 TeV. As in the ILC case, we choose one scenario based on 0.5 ab −1 of data from the lowest energy run at 380 GeV ("CLIC-380"), 9 and one scenario adding also the 1.5 ab −1 and 2 ab −1 of data taken at 1.4 TeV and 3 TeV, respectively ("CLIC-all") [151,154]. 9 The actual numbers presented in refs.…”

Section: Jhep07(2018)048 5 Projections For Future Higgs Factoriesmentioning

confidence: 99%

“…Inputs for the Higgs signal strength's uncertainties at ILC [151], CLIC [151,154], CEPC [153] and FCC-ee [152].…”

Section: Jhep07(2018)048mentioning

confidence: 99%

Current and future constraints on Higgs couplings in the nonlinear Effective Theory

Blas

Eberhardt

Krause

2018

J. High Energ. Phys.

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We perform a Bayesian statistical analysis of the constraints on the nonlinear Effective Theory given by the Higgs electroweak chiral Lagrangian. We obtain bounds on the effective coefficients entering in Higgs observables at the leading order, using all available Higgs-boson signal strengths from the LHC runs 1 and 2. Using a prior dependence study of the solutions, we discuss the results within the context of natural-sized Wilson coefficients. We further study the expected sensitivities to the different Wilson coefficients at various possible future colliders. Finally, we interpret our results in terms of some minimal composite Higgs models.

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“…There have been several proposals for next-generation e + e − colliders that are under active studies, including the Circular Electron-Positron Collider (CEPC) [29,30], the Future Circular Collider (FCC-ee) [31], the Compact Linear Collider (CLIC) [32,33], and the International Linear Collider (ILC) [34][35][36]. These colliders are planned to operate at a center of mass (CM) energy ranging from about 250 GeV to 3 TeV, thereby making accessible most of dominant production processes of the Higgs boson.…”

Section: Jhep02(2018)007mentioning

confidence: 99%

“…Therefore, even if no large deviation in the Higgs coupling is observed at ILC250 or ILC500, significant enhancement of the htt production may still be viable. At CLIC the expected accuracy for cross section is about 8.4% with an integrated luminosity of 1.5 ab −1 at √ s = 1.4 TeV [33], and at ILC the accuracy could reach 28% (6.3%) at 500 (1000) GeV [35]. There is thus a good chance to test the htt production at these high energy machines.…”

Section: Associated Production With Top Quarksmentioning

confidence: 99%

Higgs production at future e+e− colliders in the Georgi-Machacek model

Han

Liao

2018

J. High Energ. Phys.

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We study how the dominant single and double SM-like Higgs (h) production at future e + e − colliders is modified in the Georgi-Machacek (GM) model. On imposing theoretical, indirect and direct constraints, significant deviations of h-couplings from their SM values are still possible; for instance, the Higgs-gauge coupling can be corrected by a factor κ hV V ∈ [0.93, 1.15] in the allowed parameter space. For the Higgs-strahlung e + e − → hZ and vector boson fusion processes e + e − → hνν, he + e − , the cross section could increase by 32% or decrease by 13%. In the case of associated production with a top quark pair e + e − → htt, the cross section can be enhanced up to several times when the custodial triplet scalar H 0 3 is resonantly produced. In the meanwhile, the double Higgs production e + e − → hhZ (hhνν) can be maximally enhanced by one order of magnitude at the resonant H 0 1,3 production. We also include exclusion limits expected from future LHC runs at higher energy and luminosity and discuss their further constraints on the relevant model parameters. We find that the GM model can result in likely measurable deviations of Higgs production from the SM at future e + e − colliders.

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Higgs physics at the CLIC electron–positron linear collider

Cited by 172 publications

References 48 publications

The ALP miracle revisited

The ALP miracle revisited

Current and future constraints on Higgs couplings in the nonlinear Effective Theory

Higgs production at future e+e− colliders in the Georgi-Machacek model

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