Dark matter at the LHC: Effective field theories and gauge invariance

Bell, Nicole F.; Cai, Yi-Fu; Dent, James B.; Leane, Rebecca K.; Weiler, T.

doi:10.1103/physrevd.92.053008

Cited by 63 publications

(78 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the abundance is inversely proportional to hσvi, an upper limit on the astrophysical flux can be used to set a lower limit on hσvi [see Eq. (19)]. If WIMPs make up only part of the DM mass budget, its cross section is no longer restricted to be thermal.…”

Section: Invisibles and Subdominant Densitymentioning

confidence: 99%

GeV-scale thermal WIMPs: Not even slightly ruled out

et al. 2018

Self Cite

View full text Add to dashboard Cite

Weakly interacting massive particles (WIMPs) have long reigned as one of the leading classes of dark matter candidates. The observed dark matter abundance can be naturally obtained by freezeout of weakscale dark matter annihilations in the early Universe. This "thermal WIMP" scenario makes direct predictions for the total annihilation cross section that can be tested in present-day experiments. While the dark matter mass constraint can be as high as m χ ≳ 100 GeV for particular annihilation channels, the constraint on the total cross section has not been determined. We construct the first model-independent limit on the WIMP total annihilation cross section, showing that allowed combinations of the annihilationchannel branching ratios considerably weaken the sensitivity. For thermal WIMPs with s-wave 2 → 2 annihilation to visible final states, we find the dark matter mass is only known to be m χ ≳ 20 GeV. This is the strongest largely model-independent lower limit on the mass of thermal-relic WIMPs; together with the upper limit on the mass from the unitarity bound (m χ ≲ 100 TeV), it defines what we call the "WIMP window." To probe the remaining mass range, we outline ways forward.

show abstract

Section: Invisibles and Subdominant Densitymentioning

confidence: 99%

GeV-scale thermal WIMPs: Not even slightly ruled out

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…[50][51][52] pointed out a violation of unitarity in the mono-W scattering cross section as a consequence of the lack of gauge invariance. Nevertheless, scattering processes in DD experiments involve energy scales considerably smaller than the EWSB scale, and the potential lack of electroweak gauge invariance is not a concern.…”

Section: Jhep08(2016)111mentioning

confidence: 99%

You can hide but you have to run: direct detection with vector mediators

DʼEramo

Kavanagh

Panci

2016

J. High Energ. Phys.

124

View full text Add to dashboard Cite

We study direct detection in simplified models of Dark Matter (DM) in which interactions with Standard Model (SM) fermions are mediated by a heavy vector boson. We consider fully general, gauge-invariant couplings between the SM, the mediator and both scalar and fermion DM. We account for the evolution of the couplings between the energy scale of the mediator mass and the nuclear energy scale. This running arises from virtual effects of SM particles and its inclusion is not optional. We compare bounds on the mediator mass from direct detection experiments with and without accounting for the running. In some cases the inclusion of these effects changes the bounds by several orders of magnitude, as a consequence of operator mixing which generates new interactions at low energy. We also highlight the importance of these effects when translating LHC limits on the mediator mass into bounds on the direct detection cross section. For an axial-vector mediator, the running can alter the derived bounds on the spin-dependent DM-nucleon cross section by a factor of two or more. Finally, we provide tools to facilitate the inclusion of these effects in future studies: general approximate expressions for the low energy couplings and a public code runDM to evolve the couplings between arbitrary energy scales.

show abstract

“…At the LHC CM energy, one has to respect the full SM gauge symmetry, and not just the unbroken subgroup of it. Recently, importance of the full SM invariance, unitarity and gauge invariance with respect to the mediators was noticed in a few independent studies [13][14][15], which will be detailed in the subsequent discussions. When we impose the full SM gauge symmetry, we have to realize that the SM fermions have two independent chiralities, left-handed (LH) and right-handed (RH), and SM gauge interactions are chiral as well.…”

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.

View full text Add to dashboard Cite

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.

show abstract

Dark matter at the LHC: Effective field theories and gauge invariance

Cited by 63 publications

References 37 publications

GeV-scale thermal WIMPs: Not even slightly ruled out

GeV-scale thermal WIMPs: Not even slightly ruled out

You can hide but you have to run: direct detection with vector mediators

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

Contact Info

Product

Resources

About