Overcoming velocity suppression in dark-matter direct-detection experiments

Dienes, Keith R.; Kumar, Jason; Thomas, Brooks; Yaylali, David

doi:10.1103/physrevd.90.015012

Cited by 61 publications

(70 citation statements)

References 99 publications

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“…For a full discussion see the appendix of [60] and [61]. We write the nucleon couplings in terms of the quark couplings times a form factor (in the limit of zero momentum transfer): The scalar bilinear for light quarks can be evaluated from…”

Section: Charged Scalar Mediatormentioning

confidence: 99%

General analysis of direct dark matter detection: From microphysics to observational signatures

et al. 2015

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Beginning with a set of simplified models for spin-0, spin-1 2 , and spin-1 dark matter candidates using completely general Lorentz invariant and renormalizable Lagrangians, we derive the full set of non-relativistic operators and nuclear matrix elements relevant for direct detection of dark matter, and use these to calculate rates and recoil spectra for scattering on various target nuclei. This allows us to explore what high energy physics constraints might be obtainable from direct detection experiments, what degeneracies exist, which operators are ubiquitous and which are unlikely or subdominant. We find that there are operators which are common to all spins as well operators which are unique to spin-1 2 and spin-1 and elucidate two new operators which have not been previously considered. In addition we demonstrate how recoil energy spectra can distinguish fundamental microphysics if multiple target nuclei are used. Our work provides a complete roadmap for taking generic fundamental dark matter theories and calculating rates in direct detection experiments.This provides a useful guide for experimentalists designing experiments and theorists developing new dark matter models.

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Section: Charged Scalar Mediatormentioning

confidence: 99%

General analysis of direct dark matter detection: From microphysics to observational signatures

et al. 2015

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“…Axial-vector mediators result in spin-dependent darkmatter-proton scatterings, with the cross section described by [62] …”

Section: Direct and Indirect Detection Limitsmentioning

confidence: 99%

Constraining dark sectors at colliders: Beyond the effective theory approach

et al. 2015

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We outline and investigate a set of benchmark simplified models with the aim of providing a minimal simple framework for an interpretation of the existing and forthcoming searches of dark matter particles at the LHC. The simplified models we consider provide microscopic QFT descriptions of interactions between the Standard Model partons and the dark sector particles mediated by the four basic types of messenger fields: scalar, pseudoscalar, vector and axial-vector. Our benchmark models are characterized by four to five parameters, including the mediator mass and width, the dark matter mass and the effective coupling(s). In the gluon fusion production channel we resolve the top quark in the loop and compute full top-mass effects for scalar and pseudoscalar messengers. We show the LHC limits and reach at 8 and 14 TeV for models with all four messenger types. We also outline the complementarity of direct detection, indirect detection and LHC bounds for dark matter searches. Finally, we investigate the effects which arise from extending the simplified model to include potential new physics contributions in production. Using the scalar mediator as an example, we study the impact of heavy new physics loops which interfere with the top-mediated loops. Our computations are performed within the MCFM framework, and we provide fully flexible public Monte Carlo implementation.

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“…The only region spared is in the neighborhood of m MED 2m t , where resonant DM annihilation allows λ to be small. CP-odd couplings, on the other hand, are well-shielded from spin-independent direct detection searches [43,44], leading to more interesting phenomenology. Consequently, we will take a to be a pure pseudoscalar.…”

Section: Iii1 S-channel Mediatormentioning

confidence: 99%

Forbidden dark matter at the weak scale via the top portal

2017

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At the tail of its velocity distribution, cold dark matter (DM) can annihilate at finite temperature to states heavier than itself. We explore the possibility that DM freezeout is dictated by these "forbidden annihilations" at the electroweak scale. Demanding that annihilation products be Standard Model particles, we find that for the forbidden mechanism to primarily set the DM relic abundance, DM must couple predominantly, if not solely, to top quarks. This can be arranged by invoking a non-trivial flavor structure such as Minimal Flavor Violation. We avail two avenues to achieve the correct thermal cross-section, requiring a mediator exchanged in the s-or t-channel. These simplified models submit easily to direct detection and collider searches, and necessarily hide from indirect detection signals. Viable supersymmetric spectra involving the forbidden mechanism may be found if combined with co-annihilation.

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Overcoming velocity suppression in dark-matter direct-detection experiments

Cited by 61 publications

References 99 publications

General analysis of direct dark matter detection: From microphysics to observational signatures

General analysis of direct dark matter detection: From microphysics to observational signatures

Constraining dark sectors at colliders: Beyond the effective theory approach

Forbidden dark matter at the weak scale via the top portal

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