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An independent assessment of significance of annual modulation in COSINE-100 data
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An independent assessment of significance of annual modulation in COSINE-100 data
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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. The Bayesian test however strongly prefers a background model. This is the first proof of principles demonstration of application of Bayesian and information theory based techniques to COSINE-100 data to assess the significance of annual modulation.
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Cited by 1 Pith paper
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Search for Annual Modulation in Combined ANAIS 112 and COSINE 100 Data using Bayesian Model Comparison
Bayesian model comparison of combined ANAIS-112/COSINE-100 residuals finds no meaningful support for an annual cosine modulation (ln Bayes factor < 1.2).
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