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ANAIS-112 three years data: a sensitive model independent negative test of the DAMA/LIBRA dark matter signal
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abstract
Weakly interacting massive particles (WIMPs) are well-motivated candidates for dark matter. One signature of galactic WIMPs is the annual modulation expected in a detector's interaction rate, which arises from Earth's revolution around the Sun. Over two decades, the DAMA/LIBRA experiment has observed such modulation with 250 kg of NaI(Tl) scintillators, in accordance with WIMP expectations but inconsistent with the negative results of other experiments. The signal depends on the target material, so to validate or refute the DAMA result, the experiment must be replicated using the same material. This is the goal of the ANAIS-112 experiment, currently underway since August 2017 with 112.5 kg of NaI(Tl). In this work, we present a reanalysis of three years of data employing an improved analysis chain to enhance the experimental sensitivity. The results presented here are consistent with the absence of modulation and inconsistent with DAMA's observation at nearly 3$\sigma$ confidence level, with the potential to reach a 5$\sigma$ level within 8 years from the beginning of the data collection. Additionally, we explore the impact of different scintillation quenching factors in the comparison between ANAIS-112 and DAMA/LIBRA.
Forward citations
Cited by 5 Pith papers
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First Experimental Bounds on Transverse Plasmon Solar Axions with ANAIS-112
ANAIS-112 found no annual modulation from solar axions produced by resonant transverse-plasmon conversion, setting a 90% C.L. limit gaγ<1.32e-9 GeV^-1 at ma≈150 eV.
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DAMA/LIBRA and dark matter: decisive tension or contrived cancellation
DAMA's annual modulation signal is incompatible at >5σ with ANAIS-112 and COSINE-100 under physical dark-matter recoil models; reconciliation requires contrived opposite-sign sodium/iodine tuning.
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The SABRE South Technical Design Report Executive Summary
SABRE South, a 35-50 kg NaI(Tl) detector with a liquid scintillator veto at the Stawell Underground Physics Laboratory, is projected to reach 5 sigma discovery or 3 sigma exclusion of the DAMA/LIBRA annual modulation ...
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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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Photomultiplier Requirements and Pre-Calibration for the SABRE South Liquid Scintillator Veto
The 20 R5912 PMTs for the SABRE South veto meet performance requirements in bench tests, and prototype pulse-shape discrimination separates gammas from neutrons at the hundreds-of-keV scale.
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