Unitarity and monojet bounds on models for DAMA, CoGeNT, and CRESST-II

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.

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

“…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%

“…1 ii) The sensitivity of current direct search experiments is high enough that DM-nucleon interactions via a Higgs boson exchange are now being probed. The SDM is a simplified model that can be used to parametrise these bounds since the DM candidate has tree-level interactions with the Higgs boson.…”

Section: Jhep10(2015)116mentioning

confidence: 99%

See 1 more Smart Citation

Singlet-Doublet model: dark matter searches and LHC constraints

Calibbi

Mariotti

Tziveloglou

2015

100

125

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.

“…That particle will be coupled to quarks and/or gluons, and, if kinematically possible, may be resonantly produced at the collider. In this regime, the EFT is no longer valid [20][21][22][23][24][25][26][27][28] and the question is whether the actual limits can be stronger or weaker. The regions with the largest cross-section are both at low center of mass energy (due to parton distribution -1 -…”

Section: Introductionmentioning

confidence: 99%

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

Papucci

Vichi

Zurek

2014

101

121

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.