Combined Annual Modulation Dark Matter Search with COSINE-100 and ANAIS-112

Abstract

The annual modulation signal, claimed to be consistent with dark matter as observed by DAMA/LIBRA in a sodium-iodide based detector, has persisted for over two decades. COSINE-100 and ANAIS-112 were designed to test the claim directly using the same target material. COSINE-100, located at Yangyang Underground Laboratory in South Korea, and ANAIS-112, located at Canfranc Underground Laboratory in Spain, have been taking data since 2016 and 2017, respectively. Each experiment published its respective results independently. In this paper, we present the results of an annual modulation search as a test of the signal observed by DAMA/LIBRA with the first three respective years of data from COSINE-100 and ANAIS-112. Using a Markov Chain Monte Carlo method, we find best fit values for modulation amplitude of $-0.0002\pm 0.0026$ cpd/kg/keV in the 1-6 keV and $0.0021\pm 0.0028$ cpd/kg/keV in the 2-6 keV energy regions. These results are not compatible with DAMA/LIBRA's assertion for their observation of annual modulation at $3.7\sigma$ and $2.6\sigma$, respectively. Performing a simple combination of the newly released 6-years datasets from both experiments find values consistent with no modulation at $0.0005\pm 0.0019$ cpd/kg/keV in the 1-6 keV and $0.0027\pm 0.0021$ cpd/kg/keV in the 2-6 keV energy regions with $4.68\sigma$ and $3.53\sigma$ respective exclusions of the DAMA/LIBRA signal.

6 pages, 4 figures, 3 tables

References in corpus (6)

• Annual modulation results from three-year exposure of ANAIS-112
• Three-year annual modulation search with COSINE-100
• No role for neutrons, muons and solar neutrinos in the DAMA annual modulation results
• An induced annual modulation signature in COSINE-100 data by DAMA/LIBRA's analysis method
• Quenching factor measurements of sodium nuclear recoils in NaI:Tl determined by spectrum fitting
• Improving ANAIS-112 sensitivity to DAMA/LIBRA signal with machine learning techniques

Cited by in corpus (2)

• Validation of the COSINE-100U NaI(Tl) Encapsulation for Low-Temperature Operation in Liquid Scintillator
• Search for Annual Modulation in Combined ANAIS 112 and COSINE 100 Data using Bayesian Model Comparison