On dark matter models with uniquely spin-dependent detection possibilities

Details On dark matter models with uniquely spin-dependent detection possibilities On dark matter models with uniquely spin-dependent detection possibilities

2010-12-23

arxiv.org/abs/1012.5317v3

Phys.Rev.D83:115009,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures, v2: added closed form expressions for pseudoscalar loops and discussion of collider bounds. References ad

Scientific paper

10.1103/PhysRevD.83.115009

With much higher sensitivities due to coherence effects, it is often assumed that the first evidence for direct dark matter detection will come from experiments probing spin-independent interactions. We explore models that would be invisible in such experiments, but detectable via spin-dependent interactions. The existence of much larger (or even only) spin-dependent tree-level interactions is not sufficient, due to potential spin-independent subdominant or loop-induced interactions. We find that in such a way most models with detectable spin-dependent interactions would also generate detectable spin-independent interactions. Models in which a light pseudoscalar acts as the mediator seem to uniquely evade this conclusion. We present a particular viable dark matter model generating such an interaction.

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