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COSINE-100 Full Dataset Challenges the Annual Modulation Signal of DAMA/LIBRA

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arxiv 2409.13226 v2 pith:HA45IQ3L submitted 2024-09-20 hep-ex

COSINE-100 Full Dataset Challenges the Annual Modulation Signal of DAMA/LIBRA

N. Carlin , J. Y. Cho , J. J. Choi , S. Choi , A. C. Ezeribe , L. E. Franca , C. Ha , I. S. Hahn
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S. J. Hollick E. J. Jeon H. W. Joo W. G. Kang M. Kauer B. H. Kim H. J. Kim J. Kim K. W. Kim S. H. Kim S. K. Kim W. K. Kim Y. D. Kim Y. H. Kim Y. J. Ko D. H. Lee E. K. Lee H. Lee H. S. Lee H. Y. Lee I. S. Lee J. Lee J. Y. Lee M. H. Lee S. H. Lee S. M. Lee Y. J. Lee D. S. Leonard N. T. Luan V. H. A. Machado B. B. Manzato R. H. Maruyama R. J. Neal S. L. Olsen B. J. Park H. K. Park H. S. Park J. C. Park K. S. Park S. D. Park R. L. C. Pitta H. Prihtiadi S. J. Ra C. Rott K. A. Shin D. F. F. S. Cavalcante M. K. Son N. J. C. Spooner L. T. Truc L. Yang G. H. Yu
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keywords damalibradarkmattermodulationsignalannualcollaboration
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For over 25 years, the DAMA/LIBRA collaboration has claimed to observe an annual modulation signal, suggesting the existence of dark matter interactions. However, no experiment employing different target materials has observed a dark matter signal consistent with their result. To address this puzzle, the COSINE-100 collaboration conducted a model-independent test using sodium iodide crystal detectors, the same target material as DAMA/LIBRA. Analyzing data collected over 6.4 years by the effective mass of 61.3 kg, with improved energy calibration and time-dependent background modeling, we found no evidence of an annual modulation signal, challenging the DAMA/LIBRA result with a confidence level greater than 3$\sigma$. This finding represents a substantial step toward resolving the long-standing debate surrounding DAMA/LIBRA's dark matter claim, indicating that the observed modulation is unlikely to be caused by dark matter interactions.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. DAMA/LIBRA and dark matter: decisive tension or contrived cancellation

    hep-ph 2025-10 conditional novelty 6.0

    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.

  2. Search for Annual Modulation in Combined ANAIS 112 and COSINE 100 Data using Bayesian Model Comparison

    hep-ex 2025-12 conditional novelty 4.0

    Bayesian model comparison of combined ANAIS-112/COSINE-100 residuals finds no meaningful support for an annual cosine modulation (ln Bayes factor < 1.2).

  3. Shifting the neutrino fog: studying the Isospin-violating Dark Matter case

    hep-ph 2025-12 conditional novelty 4.0

    Isospin-violating dark matter shifts the neutrino fog: in xenon, a Z-portal model (f_n/f_p ≈ -22) lowers the discovery limit while the Scotogenic model (f_n/f_p = 0) raises it.