{
  "abstract": "A bstract : This paper presents the first differential fiducial measurements of γγ → ττ using 1.93 nb − 1 of Pb+Pb data at $$ \\sqrt{s_{\\mathrm{NN}}}=5.02 $$ s NN = 5.02 TeV recorded by the ATLAS detector. Events in which one of the τ -leptons decays into a muon and two neutrinos $$ \\tau \\to {\\nu}_{\\tau }{\\overline{\\nu}}_{\\mu}\\mu $$ τ → ν τ ν ¯ μ μ are selected and are categorized into three regions by the presence of an electron or either one or three charged-particle track(s) from the second τ -lepton decay. The measurement is performed in events where both Pb ions remain intact and no neutrons are emitted. Differential cross-sections are measured for seven variables in three fiducial regions at particle level. The measurements are compared to theory predictions with different photon flux models and spin correlation effects. For the fiducial region with one muon and one electron in the final state, comparisons to next-to-leading-order electroweak predictions are also made. The transverse momentum ( p T ) of the decay muon, the p T of the visible decay particles of the other τ -lepton, the total p T , invariant mass, and pseudorapidity of the visible particles from the di- τ system, and the rapidity and acoplanarity of the visible decay particles from either τ -lepton are measured. A maximum-likelihood fit to the muon transverse-momentum distributions in the three regions before unfolding is performed to extract the τ -lepton anomalous magnetic moment a τ and electric dipole moment d τ , the latter for the first time in heavy ion collisions. The observed 95% confidence level intervals are − 0 . 057 < a τ < 0 . 035 and |d τ | < 2 . 7 × 10 − 16 e cm.",
  "abstract_shown": true,
  "affiliations": [
    "CPPM, Aix-Marseille Université, CNRS/IN2P3",
    "University of Bergen",
    "University of Oklahoma",
    "New York University Abu Dhabi",
    "Georg-August-Universität Göttingen",
    "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",
    "King’s College London",
    "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",
    "Universität Mainz",
    "Alexandru Ioan Cuza University of Iasi",
    "Khalifa University of Science and Technology",
    "Azerbaijan Academy of Sciences",
    "Centro Mixto Universidad de Valencia — CSIC",
    "Zhengzhou University",
    "INFN Sezione di Roma Tor Vergata",
    "Università di Roma Tor Vergata",
    "Lunds universitet",
    "Waseda University",
    "Universität Bonn",
    "Julius-Maximilians-Universität Würzburg",
    "INFN Sezione di Bologna",
    "University of Victoria",
    "University of Bern"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2865,
  "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"
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      "affs": [
        14
      ],
      "name": "J. Ackerschott",
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      "affs": [
        15
      ],
      "name": "C. Adam Bourdarios",
      "orcid": "0000-0002-2634-4958"
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      "affs": [
        16
      ],
      "name": "L. Adamczyk",
      "orcid": "0000-0002-5859-2075"
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    {
      "affs": [
        17
      ],
      "name": "S. V. Addepalli",
      "orcid": "0000-0002-2919-6663"
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    {
      "affs": [
        18
      ],
      "name": "M. J. Addison",
      "orcid": "0000-0002-8387-3661"
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    {
      "affs": [
        19
      ],
      "name": "J. Adelman",
      "orcid": "0000-0002-1041-3496"
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    {
      "affs": [
        20
      ],
      "name": "A. Adiguzel",
      "orcid": "0000-0001-6644-0517"
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      "affs": [
        21
      ],
      "name": "T. Adye",
      "orcid": "0000-0003-0627-5059"
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    {
      "affs": [
        22
      ],
      "name": "A. A. Affolder",
      "orcid": "0000-0002-9058-7217"
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      "affs": [
        23
      ],
      "name": "Y. Afik",
      "orcid": "0000-0001-8102-356X"
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        24
      ],
      "name": "M. N. Agaras",
      "orcid": "0000-0002-4355-5589"
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        25
      ],
      "name": "A. Aggarwal",
      "orcid": "0000-0002-1922-2039"
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    {
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        26
      ],
      "name": "C. Agheorghiesei",
      "orcid": "0000-0003-3695-1847"
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    {
      "affs": [
        27
      ],
      "name": "A. Ahmad",
      "orcid": "0000-0001-8638-0582"
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    {
      "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"
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      "affs": [
        18
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      "name": "J. S. Allen",
      "orcid": "0000-0001-9398-8158"
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  "bibtex": "https://research.draconitic.com/paper/bqqdedfm6h581.bib",
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  "doi": "10.1007/jhep10(2026)053",
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  "id": "bqqdedfm6h581",
  "issns": [
    "1029-8479"
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  "landing_url": "https://link.springer.com/article/10.1007/JHEP10(2026)053",
  "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",
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  "native_subjects": [
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      "openalex",
      "3106|Particle physics theoretical and experimental studies"
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  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)053.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/bqqdedfm6h581.ris",
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      "url": "https://link.springer.com/article/10.1007/JHEP10(2026)053"
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      "field": "physics",
      "origin": "openalex:3106|Particle physics theoretical and experimental studies",
      "subfield": "high-energy"
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  ],
  "title": "Differential measurements of γγ → ττ and constraints on τ-lepton electromagnetic moments in Pb+Pb collisions at $$ \\sqrt{s_{\\mathrm{NN}}}=5.02 $$ TeV with ATLAS",
  "title_text": "Differential measurements of γγ → ττ and constraints on τ-lepton electromagnetic moments in Pb+Pb collisions at √(s_NN)=5.02 TeV with ATLAS",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/bqqdedfm6h581",
  "venue": "Journal of High Energy Physics",
  "versions": [
    {
      "doi": "10.48550/arxiv.2605.04584",
      "pid": "ap1vt559nysxy",
      "relation": "preprint",
      "title": "Differential measurements of $γγ\\toττ$ and constraints on $τ$-lepton electromagnetic moments in Pb+Pb collisions at $\\sqrt{s_{_\\text{NN}}} = 5.02$ TeV with ATLAS",
      "venue": "arXiv"
    }
  ]
}