Constraining the Higgs portal with antiprotons

Urbano, Alfredo; Xue, Wei

doi:10.1007/jhep03(2015)133

Cited by 28 publications

(24 citation statements)

References 106 publications

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“…The size of the Higgs portal coupling is highly constrained by the bound on the invisible Higgs width for a general scalar, while for a DM candidate obtaining the observed relic density while also satisfying direct detection searches forces the parameter space to be even more highly constrained [61,62], requiring a highly tuned and very small Higgs portal coupling. The simplest version of this scenario is now almost, if not completely, excluded by these multiple constraints from several observations and experiments [63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82].…”

Section: Introductionmentioning

confidence: 99%

Thick branes in extra dimensions and suppressed dark couplings

Landim

Rizzo

2019

J. High Energ. Phys.

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The nature of dark matter (DM) and how it may interact with the various fields of the Standard Model (SM) remains a mystery. In this paper we show that the interaction between new light dark matter mediators and the SM particles can be naturally suppressed if one employs a single, flat extra dimension (ED). In this setup, the SM fields are localized in a finite width 'fat' brane, similar to models of Universal Extra Dimensions (UED), while DM, in turn, is confined to a thin brane at the opposite end of the ED interval. Including brane localized kinetic terms on the fat brane for the mediator fields, the resulting coupling between the SM and these light mediators can be several orders of magnitude smaller than the corresponding ones between the mediators and DM which we assume to be a typical gauge coupling. We investigate the implications of this scenario for both vector (i.e, dark photon, DP) and scalar mediator fields in the 5-D bulk. In this setup kinetic mixing, which is usually employed to suppress light mediator couplings, is not required. Here we assume that the SM particles couple to the DP via their B − L charges while the DP couples to the DM via a dark charge. Both the vector DP couplings and the corresponding Higgs portal couplings with the SM are shown to be natural small in magnitude with a size dependent on ratio of the 5-D compactification radius, R −1 ∼ 0.1 − 1 GeV, and the SM brane thickness, L −1 ∼ 2 − 10 TeV, a range chosen to avoid LHC and other experimental constraints. In this framework one can obtain the observed value of the DM relic abundance for a wide range of parameter choices, while the constrains due to direct DM detection and the invisible width of the Higgs do not impose significant challenges to the model. Finally, this mechanism can lead to distinct signatures in both present and upcoming experiments as it combines some common features of UED and DP models in a single ED setup.

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Section: Introductionmentioning

confidence: 99%

Thick branes in extra dimensions and suppressed dark couplings

Landim

Rizzo

2019

J. High Energ. Phys.

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“…Nevertheless there can be testable consequences of this scenario which can put constraints on its coupling and mass. These include constraints from searches of invisible decay of Higgs at the Large Hadron Collider (LHC) [25][26][27], direct and indirect detections of DM as well as compliance with the observed relic density [28][29][30][31][32]. Implications for the LHC [33][34][35][36][37] and ILC [38] have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Electroweak vacuum stability in presence of singlet scalar dark matter in TeV scale seesaw models

et al. 2017

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We consider singlet extensions of the standard model, both in the fermion and the scalar sector, to account for the generation of neutrino mass at the TeV scale and the existence of dark matter respectively.For the neutrino sector we consider models with extra singlet fermions which can generate neutrino mass via the so called inverse or linear seesaw mechanism whereas a singlet scalar is introduced as the candidate for dark matter. We show that although these two sectors are disconnected at low energy, the coupling constants of both the sectors get correlated at high energy scale by the constraints coming from the perturbativity and stability/metastability of the electroweak vacuum. The singlet fermions try to destabilize the electroweak vacuum while the singlet scalar aids the stability. As an upshot, the electroweak vacuum may attain absolute stability even upto the Planck scale for suitable values of the parameters. We delineate the parameter space for the singlet fermion and the scalar couplings for which the electroweak vacuum remains stable/metastable and at the same time giving the correct relic density and neutrino masses and mixing angles as observed.

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“…If the DM is less dense in this region, for example as predicted by the Einasto profile [75], CTA will not be sensitive to any parameter space that is not already ruled out by direct detection experiments for the model we consider. Late time annihilations can also result in a significant rate of position production in Higgs portal models, both for DM masses above and below the threshold for production of electroweak (EW) gauge bosons [76]. As a result, measurements of the antiproton flux by AMS-02 [77] constrain the value of the portal coupling [78,79], and the bounds obtained can be comparable to those from direct detection experiments in the high DM mass region.…”

Section: Direct Indirect and Collider Constraintsmentioning

confidence: 95%

“…However, as discussed in Section 2.1, this is obtained assuming a relatively optimistic DM spatial distribution. Future measurements of anti-protons or anti-deuterium [129] produced by DM annihilations might also be sensitive to parts of parameter space that are not currently excluded [76,130], however astrophysical backgrounds and uncertainties are likely to remain significant.…”

Section: Direct and Indirect Detectionmentioning

confidence: 99%

Higgs portal dark matter in non-standard cosmological histories

Hardy

2018

J. High Energ. Phys.

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A scalar particle with a relic density set by annihilations through a Higgs portal operator is a simple and minimal possibility for dark matter. However, assuming a thermal cosmological history this model is ruled out over most of parameter space by collider and direct detection constraints. We show that in theories with a non-thermal cosmological history Higgs portal dark matter is viable for a wide range of dark matter masses and values of the portal coupling, evading existing limits. In particular, we focus on the string theory motivated scenario of a period of late time matter domination due to a light modulus with a decay rate that is suppressed by the Planck scale. Dark matter with a mass GeV is possible without additional hidden sector states, and this can have astrophysically relevant self-interactions. We also study the signatures of such models at future direct, indirect, and collider experiments. Searches for invisible Higgs decays at the high luminosity LHC or an e + e − collider could cover a significant proportion of the parameter space for low mass dark matter, and future direct detection experiments will play a complementary role.1 The phenomenology is very similar if the DM is a complex or real scalar, we take it to be real throughout. 2 This is assuming the coupling λ is not very small. If λ is tiny, ∼ 10 −10 , the DM relic abundance could be generated from freeze in [5,6]. 4 There might be a relatively minor inaccuracy in our calculation of the relic abundance for DM masses

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Constraining the Higgs portal with antiprotons

Cited by 28 publications

References 106 publications

Thick branes in extra dimensions and suppressed dark couplings

Thick branes in extra dimensions and suppressed dark couplings

Electroweak vacuum stability in presence of singlet scalar dark matter in TeV scale seesaw models

Higgs portal dark matter in non-standard cosmological histories

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