{
  "abstract": "The COSINE-100 experiment searched for weakly interacting massive particles (WIMPs) with NaI(Tl) crystals at the Yangyang Underground Laboratory. Using its full 6-year dataset, we lower the analysis threshold to 0.49 keV. A multi-layer perceptron classifier separates scintillation events from photomultiplier tube noise. It is trained with approximately $3\\times10^{6}$ simulated scintillation waveforms per crystal, separately for groups of events with similar numbers of photoelectron clusters. The selection keeps more than 10% of scintillation events at 0.49 keV while limiting noise contamination to below 1%. The selection efficiency is validated with $^{22}$Na-calibration data and internal $^{22}$Na events, and the selection performance is stable over the six years of data taking. With this threshold, the median expected upper limit on the spin-dependent WIMP-proton cross section reaches $1.1\\times10^{-36}$ cm$^2$ at a WIMP mass of 2.5 GeV/$c^2$, probing previously unexplored parameter space in the 2.0-2.8 GeV/$c^2$ mass range.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19668",
  "author_total": 61,
  "authors": [
    {
      "name": "J. Kim"
    },
    {
      "name": "N. Carlin"
    },
    {
      "name": "D. F. F. S. Cavalcante"
    },
    {
      "name": "J. Y. Cho"
    },
    {
      "name": "S. J. Cho"
    },
    {
      "name": "S. Choi"
    },
    {
      "name": "A. C. Ezeribe"
    },
    {
      "name": "L. E. França"
    },
    {
      "name": "O. Gileva"
    },
    {
      "name": "C. Ha"
    },
    {
      "name": "I. S. Hahn"
    },
    {
      "name": "E. J. Jeon"
    },
    {
      "name": "H. W. Joo"
    },
    {
      "name": "W. G. Kang"
    },
    {
      "name": "M. Kauer"
    },
    {
      "name": "B. H. Kim"
    },
    {
      "name": "D. Y. Kim"
    },
    {
      "name": "H. J. Kim"
    },
    {
      "name": "K. W. Kim"
    },
    {
      "name": "S. H. Kim"
    },
    {
      "name": "S. K. Kim"
    },
    {
      "name": "W. K. Kim"
    },
    {
      "name": "Y. D. Kim"
    },
    {
      "name": "Y. H. Kim"
    },
    {
      "name": "B. R. Ko"
    },
    {
      "name": "Y. J. Ko"
    },
    {
      "name": "B. C. Koh"
    },
    {
      "name": "D. H. Lee"
    },
    {
      "name": "E. K. Lee"
    },
    {
      "name": "H. Lee"
    },
    {
      "name": "H. S. Lee"
    },
    {
      "name": "H. Y. Lee"
    },
    {
      "name": "I. S. Lee"
    },
    {
      "name": "J. Lee"
    },
    {
      "name": "J. Y. Lee"
    },
    {
      "name": "M. H. Lee"
    },
    {
      "name": "S. H. Lee"
    },
    {
      "name": "S. H. Lee"
    },
    {
      "name": "Y. J. Lee"
    },
    {
      "name": "D. S. Leonard"
    },
    {
      "name": "N. T. Luan"
    },
    {
      "name": "V. H. A. Machado"
    },
    {
      "name": "B. B. Manzato"
    },
    {
      "name": "R. H. Maruyama"
    },
    {
      "name": "R. F. Muhdi"
    },
    {
      "name": "S. L. Olsen"
    },
    {
      "name": "H. K. Park"
    },
    {
      "name": "H. S. Park"
    },
    {
      "name": "J. C. Park"
    },
    {
      "name": "J. S. Park"
    },
    {
      "name": "K. S. Park"
    },
    {
      "name": "K. Park"
    },
    {
      "name": "S. D. Park"
    },
    {
      "name": "R. L. C. Pitta"
    },
    {
      "name": "H. Prihtiadi"
    },
    {
      "name": "C. Rott"
    },
    {
      "name": "K. A. Shin"
    },
    {
      "name": "M. K. Son"
    },
    {
      "name": "L. T. Truc"
    },
    {
      "name": "L. Yang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bptnnnm3sta7n.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19668",
  "fulltext_url": null,
  "id": "bptnnnm3sta7n",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19668",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7222034422",
  "pdf_url": "https://arxiv.org/pdf/2610.19668",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bptnnnm3sta7n.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.19668",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19668"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Achieving a 0.49 keV threshold in the COSINE-100 dark matter experiment",
  "title_text": "Achieving a 0.49 keV threshold in the COSINE-100 dark matter experiment",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/bptnnnm3sta7n",
  "venue": "arXiv",
  "versions": []
}