Evidence of $ZZγ$ production with the ATLAS detector

[2602.17165] Evidence of $ZZγ$ Production with the ATLAS Detector Skip to main content Search Submit Donate Log in High Energy Physics - Experiment arXiv:2602.17165 (hep-ex) [Submitted on 19 Feb 2026 ( v1 ), last revised 15 Sep 2026 (this version, v2)] Title: Evidence of $ZZγ$ Production with the ATLAS Detector Authors: ATLAS Collaboration View PDF HTML (experimental) Abstract: This Letter presents the first evidence of the simultaneous production of two $Z$ bosons and one photon with the ATLAS detector at the Large Hadron Collider. The measurement is performed using the full Run-2 dataset, recorded from 2015 to 2018, of proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 140 fb$^{-1}$. The fully leptonic final state with four leptons and one photon is analyzed, $pp\rightarrow ZZ\gamma\rightarrow\ell^+\ell^-\ell'^+\ell'^-\gamma$ with $\ell, \ell' = e$ or $\mu$. This final state is measured in a fiducial region where photon final-state radiation is minimized, and the photon has a transverse momentum of $p_{\mathrm{T}}^\gamma > 20$ GeV. Eight events are selected, with a background estimate of $0.92\pm0.15$. This results in an observed (expected) significance of the $ZZ\gamma$ final state of $4.4\sigma$ ($4.0\sigma$). The measured cross-section for $pp\rightarrow ZZ\gamma\rightarrow\ell^+\ell^-\ell'^+\ell'^-\gamma$ in the fiducial region is $\sigma_{ZZ\gamma} = 0.144 _{-0.051}^{+0.065} \text{ (stat.)} _{-0.004}^{+0.008} \text{ (syst.) fb}$, in agreement with the Standard Model prediction of $\sigma_{\textrm{fid.}}^{\textrm{SM}} = 0.130\pm0.006$ fb. Comments: Comments: 30 pages in total, author list starting page 15, 2 figures, 3 tables, published in PRL. All figures including auxiliary figures are available at this https URL Subjects: High Energy Physics - Experiment (hep-ex) Report number: CERN-EP-2026-038 Cite as: arXiv:2602.17165 [hep-ex] (or arXiv:2602.17165v2 [hep-ex] for this version) https://doi.org/10.48550/arXiv.2602.17165 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Phys. Rev. Lett. 137 (2026) 091804 Related DOI : https://doi.org/10.1103/jngg-1nf3 Focus to learn more DOI(s) linking to related resources Submission history From: ATLAS Collaboration [ view email ] [via The ATLAS Collaboration as proxy] [v1] Thu, 19 Feb 2026 08:24:04 UTC (836 KB) [v2] Tue, 15 Sep 2026 07:53:02 UTC (850 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: hep-ex < prev | next > new | recent | 2026-02 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from

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