Phenomenology of a very light scalar (100 MeV &lt; m h &lt; 10 GeV) mixing with the SM Higgs

Clarke, Jackson D.; Foot, R.; Volkas, Raymond R.

doi:10.1007/jhep02(2014)123

Cited by 149 publications

(164 citation statements)

References 98 publications

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“…The phenomenology and parametrization for light scalars can be found in refs. [38,39]. Although there exists this possibility in our DM scenario, it is disfavored by the LUX constraint ( figure 9, left).…”

Section: Direct Detectionmentioning

confidence: 85%

Majorana dark matter through a narrow Higgs portal

Dutra

Pires

Silva

2015

J. High Energ. Phys.

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We update the parameter space of a singlet Majorana fermion dark matter model, in which the standard particles interact with the dark sector through the mixing of a singlet scalar and the Higgs boson. In this model both the dark matter and the singlet scalar carry lepton number, the latter being a bilepton. The stability of the Majorana fermion is achieved by a supposed Z 2 symmetry. The lepton number symmetry breaking scale, driven by the singlet scalar, is constrained to be within hundreds to thousands of GeV, so as to give a sufficiently abundant Majorana fermion. Relic density, direct detection and invisible Higgs decay are considered in a complementary way, as we contrast our parameter space with the Planck, LUX and LHC bounds. The impacts of the future Higgs self-coupling measurements and of XENON1T detector are also discussed. We find a "narrow" Higgs portal in the sense that large deviations from the standard scalar sector (large mixing and low lepton breaking scale) are very restricted by Higgs data global fit. We perform a systematic study of the allowed parameter space, favored by scalar resonances and degeneracy. One important phenomenological signature of this model is the correlation between the discoveries of a dark matter and a singlet scalar particles. Very light singlet scalars were found disfavored by direct detection, interestingly implying that the Majoron present in our spectrum can hardly be a dark radiation candidate if our scenario addresses the DM issue. This model is very predictive and in the next few years should be completely tested by the experiments.

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Section: Direct Detectionmentioning

confidence: 85%

Majorana dark matter through a narrow Higgs portal

Dutra

Pires

Silva

2015

J. High Energ. Phys.

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“…[42][43][44][45][46][47][48][49][50][51][52][53]), including as well their impact at colliders for the case f a ∼ O(TeV) [35,36]. Additionally, constraints on the linear coupling of the ALP to W ± gauge bosons have recently been obtained in Refs.…”

Section: Previous Phenomenological Boundsmentioning

confidence: 99%

ALPs effective field theory and collider signatures

et al. 2017

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We study the leading effective interactions between the Standard Model fields and a generic singlet CP-odd (pseudo-) Goldstone boson. Two possible frameworks for electroweak symmetry breaking are considered: linear and non-linear. For the latter case, the basis of leading effective operators is determined and compared with that for the linear expansion. Associated phenomenological signals at colliders are explored for both scenarios, deriving new bounds and analyzing future prospects, including LHC and High Luminosity LHC sensitivities. Mono-Z , mono-W , W -photon plus missing energy and on-shell top final states are most promising signals expected in both frameworks. In addition, non-standard Higgs decays and mono-Higgs signatures are especially prominent and expected to be dominant in non-linear realisations.

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“…For example, a SM-like Higgs with a mass of 10 GeV gives a cross section only 2.5 times larger at TLEP and approximately 14 times larger at a 100 TeV p−p machine than a Higgs at 125 GeV. Nevertheless, if φ is sufficiently light, there may be a variety of interesting signatures; see, e.g., [17] for a study of current constraints which probe mixing angles down to θ φh ∼ 10 −5 . We leave a detailed study of detection prospects for m φ 10 GeV to future work, see e.g., [18] for an analysis of a similar scenario.…”

Section: Collidersmentioning

confidence: 99%

Solving the Hierarchy Problem at Reheating with a Large Number of Degrees of Freedom

et al. 2016

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We present a new solution to the electroweak hierarchy problem. We introduce N copies of the Standard Model with varying values of the Higgs mass parameter. This generically yields a sector whose weak scale is parametrically removed from the cutoff by a factor of 1/ √ N . Ensuring that reheating deposits a majority of the total energy density into this lightest sector requires a modification of the standard cosmological history, providing a powerful probe of the mechanism. Current and near-future experiments will explore much of the natural parameter space. Furthermore, supersymmetric completions which preserve grand unification predict superpartners with mass below mW × M pl /MGUT ∼ 10 TeV.

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Phenomenology of a very light scalar (100 MeV < m h < 10 GeV) mixing with the SM Higgs

Cited by 149 publications

References 98 publications

Majorana dark matter through a narrow Higgs portal

Majorana dark matter through a narrow Higgs portal

ALPs effective field theory and collider signatures

Solving the Hierarchy Problem at Reheating with a Large Number of Degrees of Freedom

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