Investigating extended scalar sectors at current and future colliders

Robens, Tania

doi:10.22323/1.350.0138

Cited by 10 publications

(13 citation statements)

References 78 publications

(149 reference statements)

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“…, λ 5 = 0, ϕ + = π/4, µ 12 = 10 3 , λ ησ = λ ησ = 0 and | sin α| 0.235 for m h 2 = 450 GeV. Note that, we take α to be at its maximum allowed value from Higgs signal rate observables at the LHC [149,150]. The obtained upper limit is comparable to the one of eq.…”

Section: Scalar Dark Mattermentioning

confidence: 74%

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Flavour and dark matter in a scoto/type-II seesaw model

Barreiros,

Camara,

Joaquim

2022

Preprint

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The neutrino mass and dark matter (DM) problems are addressed in a Standard Model extension where the type-II seesaw and scotogenic mechanisms coexist. The model features a flavour Z 8 discrete symmetry which is broken down to a Z 2 , stabilising the (scalar or fermion) DM particle. Spontaneous CP violation is implemented through the complex vacuum expectation value of a singlet scalar field, inducing observable CP-violating effects in the lepton sector. The structure of the effective neutrino mass matrix leads to constraints on the low-energy neutrino observables, namely the atmospheric neutrino mixing angle θ 23 , the Dirac CP-violating phase δ and the absolute neutrino mass scale m lightest . In particular, in most cases, the model selects one θ 23 octant with δ 3π/2. Moreover, the obtained lower bounds on m lightest are typically in the range probed by cosmology. We also analyse the constraints imposed on the model by current experimental limits on charged lepton flavour violating (cLFV) processes, as well as future projected sensitivities. It is shown that the Higgs triplet and scotogenic contributions to cLFV never overlap and that the interplay among Yukawa couplings, dark charged scalar masses and mixing leads to a wide parameter-space region compatible with current experimental bounds. We investigate the scalar and fermion DM parameter space of our model by considering relic density, direct-detection (DD) and collider constraints. For scalar DM the mass interval 68 GeV m DM 90 GeV is viable and will be probed by future DD searches. In the fermion DM case, correct relic density is always obtained for m DM > ∼ 45 GeV thanks to dark fermion-scalar coannihilation channels.

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Section: Scalar Dark Mattermentioning

confidence: 74%

“…(5.18) with y f = 1, α = π/4 and m h 2 m h 1 , leads to the bound σ SI < ∼ 1.4 × 10 −42 cm 2 . For a more realistic case where α is at its maximally-allowed value from Higgs signal rate observables at the LHC (| sin α| 0.235 for m h 2 = 450 GeV [149,150]) and y f = √ 2M f /u, with u = 1565 GeV, we obtain…”

Section: Fermionic Dark Mattermentioning

confidence: 97%

Flavour and dark matter in a scoto/type-II seesaw model

Barreiros,

Camara,

Joaquim

2022

Preprint

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“…We concentrate on the case where 𝑚 2 ≥ 125 GeV, where SM decoupling corresponds to sin 𝛼 → 0. Limits on this model are shown in figure 1, taken from [6] , including a comparison of the currently maximal available rate of 𝐻 → ℎ 125 ℎ 125 with the combination limits from ATLAS [44]. The most constraining direct search bounds are in general dominated by searches for diboson final states [45][46][47][48].…”

Section: Real Singlet Extensionmentioning

confidence: 99%

“…The model features one additional CP even neutral scalar. See [1][2][3][4][5] for original literature as well as [6] for results presented here;…”

Section: Introductionmentioning

confidence: 99%

Constraining extended scalar sectors at current and future colliders

Robens¹

2022

Preprint

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“…For the example of a single additional scalar resonance, this mixing can be constrained via precision measurements of the Higgs boson, and also with direct searches. Current constraints limit the sine of the mixing angle to O(0.1) [41]. The mixing angle and λ SH are related via…”

Section: Constraintsmentioning

confidence: 99%

Robustness of ARS Leptogenesis in Scalar Extensions

Fischer,

Lindner,

van der Woude

2021

Preprint

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Extensions of the Standard Model (SM) with sterile neutrinos are well motivated from the observed oscillations of the light neutrinos and they have shown to successfully explain the Baryon Asymmetry of the Universe (BAU) through, for instance, the so-called ARS leptogenesis. Sterile neutrinos can be added in minimal ways to the SM, but many theories exist where sterile neutrinos are not the only new fields. Such theories often include scalar bosons, which brings about the possibility of further interactions between the sterile neutrinos and the SM. In this paper we consider an extension of the SM with two sterile neutrinos and one scalar singlet particle and investigate the effect that an additional, thermalised, scalar has on the ARS leptogenesis mechanism. We show that in general the created asymmetry is reduced due to additional sterile neutrino production from scalar decays. When sterile neutrinos and scalars are discovered in the laboratory, our results will provide information on the applicability of the ARS leptogenesis mechanism.

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Investigating extended scalar sectors at current and future colliders

Cited by 10 publications

References 78 publications

Flavour and dark matter in a scoto/type-II seesaw model

Flavour and dark matter in a scoto/type-II seesaw model

Constraining extended scalar sectors at current and future colliders

Robustness of ARS Leptogenesis in Scalar Extensions

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