Using Effective Operators to Understand CoGeNT and CDMS-Silicon

Abstract

Several direct detection experiments have reported positive signals consistent with a dark matter particle with a mass of approximately 7-9 GeV and a spin independent scattering cross section of 2.5-4.8 x 10^-41 cm^2. These results do not rise to the level of discovery, but assuming that they are due to dark matter, some questions about the underlying physics can already be addressed. In this paper, I apply the effective operator formalism for dark matter-Standard Model interactions to the results of the CoGeNT and CDMS silicon target experiments. I demonstrate that only one set of flavor-blind effective operators between dark matter can quarks can be consistent with the reported results in all energy regimes of interest, namely thermal freeze-out, nuclear scattering, indirect detection, and TeV-scale colliders. This set of operators implies large couplings of dark matter with heavy quarks. The alternative implies either that the new physics has non-trivial flavor structure, that the effective formalism is not applicable and so contains new states in the spectrum accessible at the LHC, or has large annihilation channels (possibly via effective operators) into non-colored Standard Model particles.

15 pages, 2 tables, 4 figures

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• Searching for Dark Matter at Hadron Colliders
• Complementary Constraints on Light Dark Matter from Heavy Quarkonium Decays
• On the sensitivity of present direct detection experiments to WIMP-quark and WIMP-gluon effective interactions: a systematic assessment and new model-independent approaches
• Thermal dark matter implies new physics not far above the weak scale
• Dark Matter in Leptophilic Higgs Models After the LHC Run-I
• Constraints on Light Dark Matter from Single-Photon Decays of Heavy Quarkonium
• From direct detection to relic abundance: the case of proton-philic spin-dependent inelastic Dark Matter
• Effective scalar four-fermion interaction for Ge-phobic exothermic dark matter and the CDMS-II Silicon excess
• Bayesian analysis of multiple direct detection experiments
• A DAMA/Libra-phase2 analysis in terms of WIMP-quark and WIMP-gluon effective interactions up to dimension seven