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Abstract
In this work we combine information from relic abundance, direct detection, cosmic microwave background, positron fraction, gamma rays, and colliders to explore the existing constraints on couplings between Dark Matter and Standard Model constituents when no underlying model or correlation is assumed. For definiteness, we include independent vector-like effective interactions for each Standard Model fermion. Our results show that low Dark Matter masses below 20 GeV are disfavoured at the 3 σ level with respect to higher masses, due to the tension between the relic abundance requirement and upper constraints on the Dark Matter couplings. Furthermore, large couplings are typically only allowed in combinations which avoid effective couplings to the nuclei used in direct detection experiments.
Highlights
The search for Dark Matter (DM) in the form of thermal relics represents one of the most active lines of research in astro-particle and particle physics
There is an overwhelming number of dedicated experimental searches for DM, most of them concentrating on the so-called Weakly Interacting Massive Particles (WIMPs) paradigm [1]
These are classified into three different categories: (1) indirect detection searches, where the DM would annihilate or decay into Standard Model (SM) particles which can be detected, (2) direct detection searches, where the DM would scatter against the protons and neutrons in a detector, producing an observable recoil, and (3) collider searches, where the DM would be produced in high-energy collisions, leading to events with missing momentum
Summary
The search for Dark Matter (DM) in the form of thermal relics represents one of the most active lines of research in astro-particle and particle physics. For DM heavier than the Higgs, this operator would provide an additional annihilation channel relevant for indirect searches and relic abundance constraints, via χχ → hh. When constraining the DM EFT parameter space, we consider bounds from all types of experiments where a WIMP signal is being actively sought for, i.e., direct detection (namely, LUX [16] and EDELWEISS [17]), indirect detection (AMS [18] positron fraction data and Fermi-LAT data for dwarf galaxies [19]), cosmic microwave background (CMB) and relic density constraints from Planck [20], and monojet and monophoton searches in colliders (from LHC [21] and LEP data [8])..
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