An independent search for annual modulation and its significance in ANAIS-112 data

Krishak, Aditi and Desai, Shantanu (2020) An independent search for annual modulation and its significance in ANAIS-112 data. Progress of Theoretical and Experimental Physics, 2020 (9). ISSN 2050-3911

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Abstract

We perform an independent search for sinusoidal-based modulation in the recently released ANAIS-112 data, which could be induced by dark matter scatterings. We then evaluate this hypothesis against the null hypothesis that the data contain only background, using four different model comparison techniques. These include frequentist, Bayesian, and two information theorybased criteria (Akaike and Bayesian information criteria). This analysis was done on both the residual data (by subtracting the exponential fit obtained from theANAIS-112 Collaboration) as well as the total (non-background subtracted) data.We find that according to the Bayesian model comparison test, the null hypothesis of no modulation is decisively favored over a cosine-based annual modulation for the non-background subtracted dataset in the 2-6 keV energy range. None of the other model comparison tests decisively favor any one hypothesis over another. This is the first application of Bayesian and information theory techniques to test the annual modulation hypothesis inANAIS-112 data, extending our previous work on the DAMA/LIBRA and COSINE-100 data. Our analysis codes have also been made publicly available.

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