{
  "abstract": "A bstract : This paper presents a search for semi-visible Higgs boson decays in final states with a photon ( γ ) and missing transverse momentum $$ {p}_{\\mathrm{T}}^{\\mathrm{miss}} $$ p T miss . The analysis is optimised for the gluon-gluon fusion production channel and exploits a novel trigger deployed in 2023, with reduced thresholds down to 50 GeV on the photon transverse momentum ( $$ {p}_{\\mathrm{T}}^{\\gamma } $$ p T γ ) and 70 GeV on the $$ {p}_{\\mathrm{T}}^{\\mathrm{miss}} $$ p T miss , in combination with a selection on the transverse mass of the $$ {p}_{\\mathrm{T}}^{\\mathrm{miss}} $$ p T miss -γ system ( m T ) above 80 GeV. The results are interpreted in terms of Higgs boson decays into a γ and a dark photon γ d ( H → γγ d ). The analysis is performed using 135 fb − 1 of Run 3 data collected by ATLAS in 2023 and 2024. A boosted decision tree is used to identify events with misreconstructed primary vertices, which can affect the $$ {p}_{\\mathrm{T}}^{\\mathrm{miss}} $$ p T miss calculation. Data-driven methods are employed to estimate the backgrounds from jets and electrons misidentified as photons, while the backgrounds with genuine photons are taken from Monte Carlo simulations, normalised to data in control regions with muons. A binned maximum-likelihood fit to the m T distribution is performed to evaluate the compatibility of the observed data with the Standard Model expectation. No significant excess is observed over the Standard Model prediction, and an observed (expected) upper limit on the branching ratio of H → γγ d of 1.4% (1.2%) is obtained at 95% confidence level. Combining this result with previous Run 2 searches improves the observed (expected) upper limit to 0.9% (0.9%).",
  "abstract_shown": true,
  "affiliations": [
    "CPPM, Aix-Marseille Université, CNRS/IN2P3",
    "University of Bergen",
    "University of Oklahoma",
    "New York University Abu Dhabi",
    "II. Physikalisches Institut, Georg-August-Universität Göttingen",
    "Fakultät Physik, Technische Universität Dortmund",
    "Physics Department, Brookhaven National Laboratory",
    "Southern Methodist University",
    "Université Mohammed V",
    "Tel Aviv University",
    "INFN Gruppo Collegato di Udine, Sezione di Trieste",
    "ICTP",
    "Department of Physics, King’s College London",
    "Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg",
    "Université de Genève",
    "LAPP, Université Savoie Mont Blanc, CNRS/IN2P3",
    "AGH University of Krakow, Faculty of Physics and Applied Computer Science",
    "SLAC National Accelerator Laboratory",
    "University of Manchester",
    "Northern Illinois University",
    "Istanbul University",
    "Particle Physics Department, Rutherford Appleton Laboratory",
    "University of California Santa Cruz",
    "University of Chicago",
    "Barcelona Institute of Science and Technology",
    "Institut für Physik, Universität Mainz",
    "Alexandru Ioan Cuza University of Iasi",
    "Khalifa University of Science and Technology",
    "Azerbaijan Academy of Sciences",
    "Instituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia — CSIC",
    "Zhengzhou University",
    "INFN Sezione di Roma Tor Vergata",
    "Università di Roma Tor Vergata",
    "Fysiska institutionen, Lunds universitet",
    "Waseda University",
    "Physikalisches Institut, Universität Bonn",
    "Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg",
    "INFN Sezione di Bologna",
    "University of Victoria",
    "University of Bern"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2872,
  "authors": [
    {
      "name": "The ATLAS collaboration"
    },
    {
      "affs": [
        0
      ],
      "name": "G. Aad",
      "orcid": "0000-0002-6665-4934"
    },
    {
      "affs": [
        1
      ],
      "name": "E. Aakvaag",
      "orcid": "0000-0001-7616-1554"
    },
    {
      "affs": [
        2
      ],
      "name": "B. Abbott",
      "orcid": "0000-0002-5888-2734"
    },
    {
      "affs": [
        3
      ],
      "name": "S. Abdelhameed",
      "orcid": "0000-0002-0287-5869"
    },
    {
      "affs": [
        4
      ],
      "name": "K. Abeling",
      "orcid": "0000-0002-1002-1652"
    },
    {
      "affs": [
        5
      ],
      "name": "N. J. Abicht",
      "orcid": "0000-0001-5763-2760"
    },
    {
      "affs": [
        6
      ],
      "name": "S. H. Abidi",
      "orcid": "0000-0002-8496-9294"
    },
    {
      "affs": [
        7
      ],
      "name": "M. Aboelela",
      "orcid": "0009-0003-6578-220X"
    },
    {
      "affs": [
        8
      ],
      "name": "A. Aboulhorma",
      "orcid": "0000-0002-9987-2292"
    },
    {
      "affs": [
        9
      ],
      "name": "H. Abramowicz",
      "orcid": "0000-0001-5329-6640"
    },
    {
      "affs": [
        10,
        11,
        12
      ],
      "name": "B. S. Acharya",
      "orcid": "0000-0002-8588-9157"
    },
    {
      "affs": [
        13
      ],
      "name": "A. Ackermann",
      "orcid": "0000-0003-4699-7275"
    },
    {
      "affs": [
        14
      ],
      "name": "J. Ackerschott",
      "orcid": "0009-0007-5755-1347"
    },
    {
      "affs": [
        15
      ],
      "name": "C. Adam Bourdarios",
      "orcid": "0000-0002-2634-4958"
    },
    {
      "affs": [
        16
      ],
      "name": "L. Adamczyk",
      "orcid": "0000-0002-5859-2075"
    },
    {
      "affs": [
        17
      ],
      "name": "S. V. Addepalli",
      "orcid": "0000-0002-2919-6663"
    },
    {
      "affs": [
        18
      ],
      "name": "M. J. Addison",
      "orcid": "0000-0002-8387-3661"
    },
    {
      "affs": [
        19
      ],
      "name": "J. Adelman",
      "orcid": "0000-0002-1041-3496"
    },
    {
      "affs": [
        20
      ],
      "name": "A. Adiguzel",
      "orcid": "0000-0001-6644-0517"
    },
    {
      "affs": [
        21
      ],
      "name": "T. Adye",
      "orcid": "0000-0003-0627-5059"
    },
    {
      "affs": [
        22
      ],
      "name": "A. A. Affolder",
      "orcid": "0000-0002-9058-7217"
    },
    {
      "affs": [
        23
      ],
      "name": "Y. Afik",
      "orcid": "0000-0001-8102-356X"
    },
    {
      "affs": [
        24
      ],
      "name": "M. N. Agaras",
      "orcid": "0000-0002-4355-5589"
    },
    {
      "affs": [
        25
      ],
      "name": "A. Aggarwal",
      "orcid": "0000-0002-1922-2039"
    },
    {
      "affs": [
        26
      ],
      "name": "C. Agheorghiesei",
      "orcid": "0000-0003-3695-1847"
    },
    {
      "affs": [
        27
      ],
      "name": "A. Ahmad",
      "orcid": "0000-0001-8638-0582"
    },
    {
      "affs": [
        28
      ],
      "name": "F. Ahmadov",
      "orcid": "0000-0003-3644-540X"
    },
    {
      "affs": [
        29
      ],
      "name": "S. Ahuja",
      "orcid": "0009-0005-5865-8774"
    },
    {
      "affs": [
        30
      ],
      "name": "X. Ai",
      "orcid": "0000-0003-3856-2415"
    },
    {
      "affs": [
        31,
        32
      ],
      "name": "G. Aielli",
      "orcid": "0000-0002-0573-8114"
    },
    {
      "affs": [
        29
      ],
      "name": "A. Aikot",
      "orcid": "0000-0001-6578-6890"
    },
    {
      "affs": [
        8
      ],
      "name": "M. Ait Tamlihat",
      "orcid": "0000-0002-1322-4666"
    },
    {
      "affs": [
        33
      ],
      "name": "T. P. A. Åkesson",
      "orcid": "0000-0003-4141-5408"
    },
    {
      "affs": [
        34
      ],
      "name": "D. Akiyama",
      "orcid": "0000-0001-7623-6421"
    },
    {
      "affs": [
        35
      ],
      "name": "N. N. Akolkar",
      "orcid": "0000-0003-3424-2123"
    },
    {
      "affs": [
        36
      ],
      "name": "S. Aktas",
      "orcid": "0000-0002-8250-6501"
    },
    {
      "affs": [
        37
      ],
      "name": "G. L. Alberghi",
      "orcid": "0000-0003-2388-987X"
    },
    {
      "affs": [
        38
      ],
      "name": "J. Albert",
      "orcid": "0000-0003-0253-2505"
    },
    {
      "affs": [
        39
      ],
      "name": "U. Alberti",
      "orcid": "0009-0006-2568-886X"
    },
    {
      "name": "P. Albicocco",
      "orcid": "0000-0001-6430-1038"
    },
    {
      "name": "S. Alderweireldt",
      "orcid": "0000-0002-8224-7036"
    },
    {
      "name": "Z. L. Alegria",
      "orcid": "0000-0002-1977-0799"
    },
    {
      "name": "M. Aleksa",
      "orcid": "0000-0002-1936-9217"
    },
    {
      "name": "I. N. Aleksandrov",
      "orcid": "0000-0001-7381-6762"
    },
    {
      "name": "C. Alexa",
      "orcid": "0000-0003-0922-7669"
    },
    {
      "name": "T. Alexopoulos",
      "orcid": "0000-0002-8977-279X"
    },
    {
      "affs": [
        37
      ],
      "name": "F. Alfonsi",
      "orcid": "0000-0002-0966-0211"
    },
    {
      "affs": [
        14
      ],
      "name": "M. Algren",
      "orcid": "0000-0003-1793-1787"
    },
    {
      "name": "M. Alhroob",
      "orcid": "0000-0001-7569-7111"
    },
    {
      "name": "B. Ali",
      "orcid": "0000-0001-8653-5556"
    },
    {
      "name": "H. M. J. Ali",
      "orcid": "0000-0002-4507-7349"
    },
    {
      "name": "S. Ali",
      "orcid": "0000-0001-5216-3133"
    },
    {
      "name": "S. W. Alibocus",
      "orcid": "0000-0002-9377-8852"
    },
    {
      "name": "M. Aliev",
      "orcid": "0000-0002-9012-3746"
    },
    {
      "name": "G. Alimonti",
      "orcid": "0000-0002-7128-9046"
    },
    {
      "name": "C. Allaire",
      "orcid": "0000-0003-4745-538X"
    },
    {
      "name": "B. M. M. Allbrooke",
      "orcid": "0000-0002-5738-2471"
    },
    {
      "name": "D. R. Allen",
      "orcid": "0000-0002-9809-2833"
    },
    {
      "affs": [
        18
      ],
      "name": "J. S. Allen",
      "orcid": "0000-0001-9398-8158"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bk15r2e5g1xe9.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)270",
  "fulltext_url": null,
  "id": "bk15r2e5g1xe9",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/article/10.1007/JHEP10(2026)270",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [],
  "openalex": null,
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)270.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-28",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/bk15r2e5g1xe9.ris",
  "sources": [
    {
      "first_seen": "2026-10-31T12:21:02Z",
      "native_id": "10.1007/jhep10(2026)270",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1007/JHEP10(2026)270"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "issn:1029-8479",
      "subfield": "high-energy"
    }
  ],
  "title": "Search for dark photons from Higgs boson decays in the gluon-gluon fusion channel in proton-proton collisions at $$ \\sqrt{s}=13.6 $$ TeV with the ATLAS detector",
  "title_text": "Search for dark photons from Higgs boson decays in the gluon-gluon fusion channel in proton-proton collisions at √s=13.6 TeV with the ATLAS detector",
  "type": "peer-reviewed",
  "updated_at": "2026-11-02T00:20:37Z",
  "url": "https://research.draconitic.com/paper/bk15r2e5g1xe9",
  "venue": "Journal of High Energy Physics",
  "versions": [
    {
      "doi": "10.48550/arxiv.2606.14362",
      "pid": "37takqpzpjf43",
      "relation": "preprint",
      "title": "Search for dark photons from Higgs boson decays in the gluon-gluon fusion channel in proton-proton collisions at $\\sqrt{s}=13.6$ TeV with the ATLAS detector",
      "venue": "arXiv"
    }
  ]
}