An independent assessment of significance of annual modulation in COSINE-100 data

Understand

We perform an independent search for annual modulation caused by dark matter-induced scatterings in the recently released COSINE-100 data.

• We test the hypothesis that the data contains a sinusoidal modulation against the null hypothesis that the data consists of only background.
• We compare the significance using frequentist, information theoretic techniques (such as AIC and BIC), and also using the Bayesian model comparison technique.
• The information theory-based tests mildly prefer a constant background over a sinusoidal signal with the same period as that found by the DAMA collaboration.