New Experimental Constraints in a New Landscape for Composite Dark Matter

Abstract

Certain strongly interacting dark matter candidates could have evaded detection, and much work has been done on constraining their parameter space. Recently, it was shown theoretically that the scattering cross section for $m_{\chi }\gtrsim 1$ GeV pointlike dark matter with a nucleus cannot be significantly larger than the geometric cross section of the nucleus. This realization closes the parameter space for pointlike strongly interacting dark matter. However, strongly interacting dark matter is still theoretically possible for composite particles, with much parameter space open. We set new, wide-ranging limits based on data from a novel detector at the University of Chicago. Backgrounds are greatly suppressed by requiring coincidence detection between two spatially separated liquid-scintillator modules. For dark matter ($v\sim 10^{-3}$c), the time of flight would be $\sim 2\mu \mathrm{s}$, whereas for cosmic rays, it would be $\sim 2\mathrm{ns}$. We outline ways to greatly increase sensitivity at modest costs.

arXiv comment9 pages, 4 figures. Updated with minor changes to match the version that appears in PRD

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