International audienceThis document outlines a set of simplified models for dark matter and its interactions with Standard Model particles. It is intended to summarize the main characteristics that these simplified models have when applied to dark matter searches at the LHC, and to provide a number of useful expressions for reference. The list of models includes both s-channel and t-channel scenarios. For s-channel, spin-0 and spin-1 mediation is discussed, and also realizations where the Higgs particle provides a portal between the dark and visible sectors. The guiding principles underpinning the proposed simplified models are spelled out, and some suggestions for implementation are presented

No abstract

The inert Two Higgs Doublet Model (i2HDM) is a theoretically well-motivated example of a minimal consistent Dark Matter(DM) model which provides mono-jet, mono-Z, mono-Higgs and Vector-Boson-Fusion+E miss T signatures at the LHC, complemented by signals in direct and indirect DM search experiments. In this paper we have performed a detailed analysis of the constraints in the full 5D parameter space of the i2HDM, coming from perturbativity, unitarity, electroweak precision data, Higgs data from LHC, DM relic density, direct/indirect DM detection and LHC mono-jet analysis, as well as implications of experimental LHC studies on disappearing charged tracks relevant to high DM mass region. We demonstrate the complementarity of the above constraints and present projections for future LHC data and direct DM detection experiments to probe further i2HDM parameter space. The model is implemented into the CalcHEP and micrOMEGAs packages, which are publicly available at the HEPMDB database, and is ready for a further exploration in the context of the LHC, relic density and DM direct detection.

In this White Paper we present and discuss a concrete proposal for the consistent interpretation of Dark Matter searches at colliders and in direct detection experiments. Based on a specific implementation of simplified models of vector and axial-vector mediator exchanges, this proposal demonstrates how the two search strategies can be compared on an equal footing. Contents1 Scope of the Workshop 1 2 Comparison of DM searches 2 2.1 Simplified DM models 2 2.2 Comparisons of collider and DD limits 4 2.3 Future experiments and upgrades -projected sensitivities 6 3 Near-term proposal to compare DM searches based on MSDM models 10 4 Summary 11 1 Scope of the Workshop Since the start-up of the LHC in 2010, collider searches for Dark Matter (DM) particle production, and their comparison with direct detection (DD) scattering experiments such as XENON100 [2] and LUX [3], have become a focal point for both the experimental and theoretical particle and astroparticle communities.Collider searches are generally characterized by their use of 'mono-objects', such as mono-jets or mono-photons, accompanied by missing transverse energy [4][5][6][7][8][9][10][11]. Until recently, these searches were mainly interpreted in the framework of specific models, such as the ADD [12] or unparticle models [13], or else used an effective field theory (EFT) to allow for the straightforward comparison with the results of DD experiments.However, interpretations within specific models are often too narrow in scope, and several independent groups [8,11,[14][15][16][17][18][19] have pointed out that the interpretation within the EFT framework can lead to the wrong conclusions when comparing collider results with the results from DD experiments. As an alternative, a simplified model description of collider and DD searches has been advocated in order to avoid these pitfalls [16,[20][21][22][23][24][25][26][27].The Brainstorming Workshop contributed to the development of a consistent simplified framework to interpret these searches, so as to facilitate comparison of the sensitivities of collider and DD experiments. This is required in order to establish quantitatively the complementarity of these two search approaches, which is critical in our continuing quest for DM. A link to the Brainstorming Workshop's agenda, which includes links to the individual talks, is given in [1].In this White Paper, we propose benchmark scenarios in a particular simplified model framework for DM models and provide examples of plots that will allow for a more meaningful comparison of the results from collider and DD experiments. These scenarios are summarized in Section 4. This proposal should be considered as a first practical step in the discussion towards a more complete analysis strategy to be developed in the future.