Closing in on mass-degenerate dark matter scenarios with antiprotons and direct detection

Garny, Mathias; Ibarra, Alejandro; Pato, Miguel

doi:10.1088/1475-7516/2012/11/017

Cited by 26 publications

(45 citation statements)

References 173 publications

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“…In this limit Higgs exchange gives rise to an effective dimension-sixχχqq interaction. For the nuclear parameters f N T q (which include the quark masses encoding the coupling to the Higgs boson) we use the values reported in [58] (see also [59]), and f N T G = 1 − q=u,d,s f N T q . The second and third terms in Eq.…”

Section: A Direct Detectionmentioning

confidence: 99%

Top-philic dark matter within and beyond the WIMP paradigm

Garny

Heisig

Hufnagel³

et al. 2018

Phys. Rev. D

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We present a comprehensive analysis of top-philic Majorana dark matter that interacts via a colored t-channel mediator. Despite the simplicity of the model-introducing three parameters only-it provides an extremely rich phenomenology allowing us to accommodate the relic density for a large range of coupling strengths spanning over 6 orders of magnitude. This model features all "exceptional" mechanisms for dark matter freeze-out, including the recently discovered conversion-driven freeze-out mode, with interesting signatures of long-lived colored particles at colliders. We constrain the cosmologically allowed parameter space with current experimental limits from direct, indirect and collider searches, with special emphasis on light dark matter below the top mass. In particular, we explore the interplay between limits from Xenon1T, Fermi-LAT and AMS-02 as well as limits from stop, monojet and Higgs invisible decay searches at the LHC. We find that several blind spots for light dark matter evade current constraints. The region in parameter space where the relic density is set by the mechanism of conversion-driven freeze-out can be conclusively tested by R-hadron searches at the LHC with 300 fb −1 .

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Section: A Direct Detectionmentioning

confidence: 99%

Top-philic dark matter within and beyond the WIMP paradigm

Garny

Heisig

Hufnagel³

et al. 2018

Phys. Rev. D

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“…about an order of magnitude in σ SI ∝ y 4 for bottom quarks. 122 Nevertheless, even if dark matter couples only to top quarks, LZ and XENON1T are sensitive to scattering cross sections expected for thermal production for mass splittings in the few×O(10%) range. Fig.…”

Section: Colored Mediatormentioning

confidence: 99%

“…Nevertheless, the qualitative picture remains the same for a coupling to quarks of the first two generations. 6,122 For example, for a coupling to downtype quarks the direct detection constraints remain essentially unaffected, the collider constraints weaken only slightly due to the dependence of the production cross section on the parton distribution in the proton, and limits from internal bremsstrahlung weaken by a factor √ 2 due to the smaller electric charge of downtype quarks. Similarly, an extension to a model containing two mediators which couple to the up-and charm-quark, respectively, leaves collider constraints essentially unaffected, because the dominant production process for Majorana dark matter is sensitive to the valence quarks.…”

Section: Complementarity Of Constraints On the Couplingmentioning

confidence: 99%

Signatures of Majorana dark matter with t-channel mediators

Garny

Ibarra

Vogl

2015

Int. J. Mod. Phys. D

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146

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Three main strategies are being pursued to search for non-gravitational dark matter signals: direct detection, indirect detection and collider searches. Interestingly, experiments have reached sensitivities in these three search strategies which may allow detection in the near future. In order to take full benefit of the wealth of experimental data, and in order to confirm a possible dark matter signal, it is necessary to specify the nature of the dark matter particle and of the mediator to the Standard Model. In this paper, we focus on a simplified model where the dark matter particle is a Majorana fermion that couples to a light Standard Model fermion via a Yukawa coupling with a scalar mediator. We review the observational signatures of this model and we discuss the complementarity among the various search strategies, with emphasis in the well motivated scenario where the dark matter particles are produced in the early Universe via thermal freeze-out.

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“…In particular, in the Dirac DM case, the sensitivity of the 8 TeV monojet+ E T search is already sensitive to this region. In the Majorana case, since 73 Ge (spin-9/2) only makes up 7.73% of natural Ge and 29 Si only makes up 4.68 of natural Si. The SD signals from the CDMS and CoGeNT detectors are highly suppressed, and therefore are expected to be deeply inside the exclusion region of the monojet+ E T search.…”

Section: Combining Lhc Searches With Direct Detection and Thermal mentioning

confidence: 99%

Dark matter witht-channel mediator: A simple step beyond contact interaction

2014

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Effective contact operators provide the simplest parameterization of dark matter searches at colliders. However, light mediator can significantly change the sensitivity and search strategies. Considering simple models of mediators is an important next-step for collider searches. In this paper, we consider the case of a t-channel mediator. Its presence opens up new contributions to the monojet+ E T searches and can change the reach significantly. We also study the complementarity between searches for processes of monojet+ E T and direct pair production of the mediators. Mediator pair production also gives important contribution to a CMS-like monojet+ E T search where a second hard jet is allowed.There is a large region of parameter space in which the monojet+ E T search provides the stronger limit. Assuming the relic abundance of the dark matter is thermally produced within the framework of this model, we find that in the Dirac fermion dark matter case, there is no region in the parameter space that satisfies the combined constraint of monojet+ E T search and direct detection; whereas in the Majorana fermion dark matter case, the mass of dark matter must be larger than about 100 GeV. If the relic abundance requirement is not assumed, the discovery of the t-channel mediator predicts additional new physics.

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Closing in on mass-degenerate dark matter scenarios with antiprotons and direct detection

Cited by 26 publications

References 173 publications

Top-philic dark matter within and beyond the WIMP paradigm

Top-philic dark matter within and beyond the WIMP paradigm

Signatures of Majorana dark matter with t-channel mediators

Dark matter witht-channel mediator: A simple step beyond contact interaction

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