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

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 contains only background, using four different model comparison techniques. These include frequentist, Bayesian, and two information theory-based criteria (AIC and BIC). This analysis was done on both the residual data (by subtracting the exponential fit obtained from the ANAIS-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 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 in ANAIS-112 data, extending our previous work on the DAMA/LIBRA and COSINE-100 data. Our analysis codes have also been made publicly available.

arXiv comment9 pages, 1 figure. Analysis code and data used to reproduce the results can be found at https://github.com/aditikrishak/ANAIS112_analysis

References in corpus (14)

• Asymptotic formulae for likelihood-based tests of new physics
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Information criteria for astrophysical model selection
• Statistics: Handle with Care, Detecting Multiple Model Components with the Likelihood Ratio Test
• How many cosmological parameters?
• Markov Chain Monte Carlo Methods for Bayesian Data Analysis in Astronomy
• First model independent results from DAMA/LIBRA-phase2
• Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment
• First results on dark matter annual modulation from ANAIS-112 experiment
• A comprehensive comparison of cosmological models from latest observational data
• Statistical Significance of spectral lag transition in GRB 160625B
• Robust model comparison tests of DAMA/LIBRA annual modulation
• An independent assessment of significance of annual modulation in COSINE-100 data
• Annual modulations from secular variations: not relaxing DAMA?

Cited by in corpus (5)

• Search for Lorentz Invariance Violation from stacked Gamma-Ray Burst spectral lag data
• Two Dimensional Clustering of Gamma-Ray Bursts using durations and hardness
• Classification of Pulsar Glitch Amplitudes using Extreme Deconvolution
• Bayesian Analysis of time dependence of DAMA annual modulation amplitude
• Search for Annual Modulation in Combined ANAIS 112 and COSINE 100 Data using Bayesian Model Comparison