Effective theories for dark matter nucleon scattering

Hisano, Junji; Nagai, R.; Nagata, Natsumi

doi:10.1007/jhep05(2015)037

Cited by 86 publications

(121 citation statements)

References 36 publications

(48 reference statements)

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“…Of particular importance are works in the context of EFTs. For instance, the physics relevant to DM-nucleon scattering in direct detection experiments can be completely captured by a non-relativistic EFT [16][17][18][19][20][21][22]. When relating direct detection results to other probes of DM interactions, it is more convenient to work with manifestly Lorentz-covariant effective operators, and this has been standard practice in the field for decades [23][24][25][26].…”

Section: Jhep12(2015)120mentioning

confidence: 99%

The coannihilation codex

Baker

Brod

Hedri

et al. 2015

J. High Energ. Phys.

121

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We present a general classification of simplified models that lead to dark matter (DM) coannihilation processes of the form DM + X → SM 1 + SM 2 , where X is a coannihilation partner for the DM particle and SM 1 , SM 2 are Standard Model fields. Our classification also encompasses regular DM pair annihilation scenarios if DM and X are identical. Each coannhilation scenario motivates the introduction of a mediating particle M that can either belong to the Standard Model or be a new field, whereby the resulting interactions between the dark sector and the Standard Model are realized as tree-level and dimension-four couplings. We construct a basis of coannihilation models, classified by the SU(3) C × SU(2) L × U(1) Y quantum numbers of DM, X and M. Our main assumptions are that dark matter is an electrically neutral color singlet and that all new particles are either scalars, Dirac or Majorana fermions, or vectors. We illustrate how new scenarios arising from electroweak symmetry breaking effects can be connected to our electroweak symmetric simplified models. We offer a comprehensive discussion of the phenomenological features of our models, encompassing the physics of thermal freeze-out, direct and indirect detection constraints, and in particular searches at the Large Hadron Collider (LHC). Many novel signatures that are not covered in current LHC searches are emphasized, and new and improved LHC analyses tackling these signatures are proposed. We discuss how the coannihilation simplified models can be used to connect results from all classes of experiments in a straightforward and transparent way. This point is illustrated with a detailed discussion of the phenomenology of a particular simplified model featuring leptoquark-mediated dark matter coannihilation.

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Section: Jhep12(2015)120mentioning

confidence: 99%

The coannihilation codex

Baker

Brod

Hedri

et al. 2015

J. High Energ. Phys.

121

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“…exclusion crosssections provided in [59] and find the limits on m MED . DM in tchSDM and tchFDM can scatter with nuclei through gluon loops (see [55] for all the attendant Feynman diagrams) Higgs-mediated loop diagrams, as detailed in [56], contributing to spin-independent direct detection rates. These limits are shown on the m DM − m MED plane in Fig.…”

Section: Iii2 T-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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“…As discussed numerous places in the literature [23,52,[55][56][57], there are potentially important direct detection effects due to RGE running from the UV to the nuclear scale. A user-friendly procedure for approximating these effects is presented in ref.…”

Section: Jhep01(2017)086mentioning

confidence: 99%

Simplified DM models with the full SM gauge symmetry: the case of t-channel colored scalar mediators

Ko¹,

Natale²,

Park

et al. 2017

J. High Energ. Phys.

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Abstract:The general strategy for dark matter (DM) searches at colliders currently relies on simplified models. In this paper, we propose a new t-channel UV-complete simplified model that improves the existing simplified DM models in two important respects: (i) we impose the full SM gauge symmetry including the fact that the left-handed and the righthanded fermions have two independent mediators with two independent couplings, and (ii) we include the renormalization group evolution when we derive the effective Lagrangian for DM-nucleon scattering from the underlying UV complete models by integrating out the t-channel mediators. The first improvement will introduce a few more new parameters compared with the existing simplified DM models. In this study we look at the effect this broader set of free parameters has on direct detection and the mono-X + MET (X=jet,W, Z) signatures at 13 TeV LHC while maintaining gauge invariance of the simplified model under the full SM gauge group. We find that the direct detection constraints require DM masses less than 10 GeV in order to produce phenomenologically interesting collider signatures. Additionally, for a fixed mono-W cross section it is possible to see very large differences in the mono-jet cross section when the usual simplified model assumptions are loosened and isospin violation between RH and LH DM-SM quark couplings are allowed.

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Effective theories for dark matter nucleon scattering

Cited by 86 publications

References 36 publications

The coannihilation codex

The coannihilation codex

Forbidden dark matter at the weak scale via the top portal

Simplified DM models with the full SM gauge symmetry: the case of t-channel colored scalar mediators

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