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Quantifying the evidence for Dark Matter in CoGeNT data · Around

2014

Quantifying the evidence for Dark Matter in CoGeNT data

Davis, Jonathan H., McCabe, Christopher, Boehm, Celine

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We perform an independent analysis of data from the CoGeNT direct detection experiment to quantify the evidence for dark matter recoils.

We critically re-examine the assumptions that enter the analysis, focusing specifically on the separation of bulk and surface events, the latter of which constitute a large background.
This separation is performed using the event rise-time, with the surface events being slower on average.
We fit the rise-time distributions for the bulk and surface events with a log-normal and Pareto distribution (which gives a better fit to the tail in the bulk population at high rise-times) and account for the energy-dependence of the bulk fraction using a cubic spline.

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