On the validity of the effective field theory for dark matter searches at the LHC

Busoni, Giorgio; Simone, Andrea De; Morgante, Enrico; Riotto, Antonio

doi:10.1016/j.physletb.2013.11.069

Cited by 243 publications

(312 citation statements)

References 39 publications

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“…Values of M Ã up to 760, 760, and 1010 GeV are excluded for the D5, D8, and D9 operators, respectively. As already mentioned, the effective field theory model becomes a poor approximation when the momentum transferred in the interaction Q tr is comparable to the mass of the intermediate state 10,72]. In order to illustrate the sensitivity to the unknown ultraviolet completion of the theory, limits computed retaining only simulated events with Q tr < m V are also shown, for a value of the coupling ffiffiffiffiffiffiffiffi ffi g f g χ p equal to either unity or the maximum value (4π) that allows the perturbative approach to be valid.…”

Section: Resultsmentioning

confidence: 99%

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Aad¹,

Abbott²,

Abdallah³

et al. 2015

Phys. Rev. D

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Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the LHC are reported. Data were collected in proton-proton collisions at a center-of-mass energy of 8 TeV and correspond to an integrated luminosity of 20.3 fb −1 . The observed data are well described by the expected Standard Model backgrounds. The expected (observed) upper limit on the fiducial cross section for the production of events with a photon and large missing transverse momentum is 6.1 (5.3) fb at 95% confidence level. Exclusion limits are presented on models of new phenomena with large extra spatial dimensions, supersymmetric quarks, and direct pair production of dark-matter candidates.

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Section: Resultsmentioning

confidence: 99%

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Aad¹,

Abbott²,

Abdallah³

et al. 2015

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…While this approach has been very useful in obtaining model independent bounds on DM properties from direct and indirect searches, it has been shown [1][2][3] that it can be misleading when considering the complementarity of these searches with DM searches in high-energy colliders.…”

Section: Jhep10(2015)116mentioning

confidence: 99%

Singlet-Doublet model: dark matter searches and LHC constraints

Calibbi

Mariotti

Tziveloglou

2015

J. High Energ. Phys.

101

125

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Abstract:The Singlet-Doublet model of dark matter is a minimal extension of the Standard Model with dark matter that is a mixture of a singlet and a non-chiral pair of electroweak doublet fermions. The stability of dark matter is ensured by the typical parity symmetry, and, similar to a 'Bino-Higgsino' system, the extra matter content improves gauge coupling unification. We revisit the experimental constraints on the Singlet-Doublet dark matter model, combining the most relevant bounds from direct (spin independent and spin dependent) and indirect searches. We show that such comprehensive analysis sets strong constraints on a large part of the 4-dimensional parameter space, closing the notorious 'blind-spots' of spin independent direct searches. Our results emphasise the complementarity of direct and indirect searches in probing dark matter models in diverse mass scale regimes. We also discuss the LHC bounds on such scenario, which play a relevant role in the low mass region of the dark matter candidate.

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“…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.

102

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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On the validity of the effective field theory for dark matter searches at the LHC

Cited by 243 publications

References 39 publications

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Search for new phenomena in events with a photon and missing transverse momentum inppcollisions ats=8 TeVwith the ATLAS detecto

Singlet-Doublet model: dark matter searches and LHC constraints

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

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