Simplified models for dark matter interacting with quarks

DiFranzo, Anthony; Nagao, Keiko; Rajaraman, Arvind; Tait, Tim M. P.

doi:10.1007/jhep11(2013)014

Cited by 131 publications

(127 citation statements)

References 48 publications

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“…The use of multi-jet plus MET searches in the context of supersymmetric simplified models has been extensively discussed in [29] and their effect for a squark mediator was assessed in [24][25][26][27]. Quantitatively, our results differ substantially from the results of these previous works.…”

Section: Jhep11(2014)024contrasting

confidence: 69%

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Monojet versus the rest of the world I: t-channel models

Papucci

Vichi

Zurek

2014

J. High Energ. Phys.

101

121

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Monojet searches using Effective Field Theory (EFT) operators are usually interpreted as a robust and model independent constraint on direct detection (DD) scattering cross-sections. At the same time, a mediator particle must be present to produce the dark matter (DM) at the LHC. This mediator particle may be produced on shell, so that direct searches for the mediating particle can constrain the effective operator being applied to monojet constraints. In this first paper, we do a case study on t-channel models in monojet searches, where the (Standard Model singlet) DM is pair produced via a t-channel mediating particle, whose supersymmetric analogue is the squark. We compare monojet constraints to direct constraints on single or pair production of the mediator from multi-jets plus missing energy searches and we identify the regions where the latter dominate over the former. We show that computing bounds using supersymmetric simplified models and in the narrow width approximation, as done in previous work in the literature, misses important quantitative effects. We perform a full event simulation and statistical analysis, and we compute the effects of both on-and off-shell production of the mediating particle, showing that for both the monojet and multi-jets plus missing energy searches, previously derived bounds provided more conservative bounds than what can be extracted by including all relevant processes in the simulation. Monojets and searches for supersymmetry (SUSY) provide comparable bounds on a wide range of the parameter space, with SUSY searches usually providing stronger bounds, except in the regions where the DM particle and the mediator are very mass degenerate. The EFT approximation rarely is able to reproduce the actual limits. In a second paper to follow, we consider the case of s-channel mediators.

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Section: Jhep11(2014)024contrasting

confidence: 69%

“…function effects), and on resonance [4,7,20,21,[23][24][25][26][27]. On the other hand, production at low √ s is the most contaminated by SM backgrounds.…”

Section: Jhep11(2014)024mentioning

confidence: 99%

Monojet versus the rest of the world I: t-channel models

Papucci

Vichi

Zurek

2014

J. High Energ. Phys.

101

121

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“…New ways of running the searches and expressing the bounds will be a necessity, the main options being simplified and, indeed, benchmark models (see e.g. [12][13][14][15][16][17][18][19] for previous examples).…”

Section: Introductionmentioning

confidence: 99%

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass

Abramowicz¹,

Abt²,

Adamczyk³

et al. 2014

J. High Energ. Phys.

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We extend the Standard Model with an EW fermion triplet, stable thanks to one of the accidental symmetries already present in the theory. On top of being a potential Dark Matter candidate, additional motivations for this new state are the stability of the vacuum, the fact it does not introduce a large fine-tuning in the Higgs mass, and that it helps with gauge coupling unification. We perform an analysis of the reach for such a particle at the high-luminosity Lhc, and at a futuristic 100 TeV pp collider. We do so for the monojet, monophoton, vector boson fusion and disappearing tracks channels. At 100 TeV, disappearing tracks will likely probe the mass region of 3 TeV, relevant for thermally produced Dark Matter. The reach of the other channels is found to extend up to ∼ 1.3 (1.7) TeV for 3 (30) ab −1 of integrated luminosity, provided systematics are well under control. This model also constitutes a benchmark of a typical WIMP Dark Matter candidate, and its phenomenology reproduces that of various models of Supersymmetry featuring a pure Wino as the lightest sparticle.

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“…By specifying the spin and gauge quantum numbers of the dark matter and the mediators, the parameter space can be made relatively small, allowing an easy conversion of bounds between experiments and theories. Previous papers have discussed colored mediators [33][34][35], which result in t-channel production of dark matter in a manner very similar to squarks in supersymmetry. Other works have considered vector and axial vector Z models [29,36,37], which cause s-channel dark matter production at colliders.…”

Section: Introductionmentioning

confidence: 99%

Scalar simplified models for dark matter

2015

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We introduce a set of minimal simplified models for dark matter interactions with the Standard Model, connecting the two sectors via either a scalar or pseudoscalar particle. These models have a wider regime of validity for dark matter searches at the LHC than the effective field theory approach, while still allowing straightforward comparison to results from non-collider dark matter detection experiments. Such models also motivate dark matter searches in multiple correlated channels. In this paper, we constrain scalar and pseudoscalar simplified models with direct and indirect detection experiments, as well as from existing LHC searches with missing energy plus tops, bottoms, or jets, using the exact loop-induced coupling with gluons. This calculation significantly affects key differential cross sections at the LHC, and must be properly included. We make connections with the Higgs sector, and conclude with a discussion of future searches at the LHC.

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Simplified models for dark matter interacting with quarks

Cited by 131 publications

References 48 publications

Monojet versus the rest of the world I: t-channel models

Monojet versus the rest of the world I: t-channel models

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass

Scalar simplified models for dark matter

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