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Evidence of $ZZγ$ Production and Observation of 4ℓγ in Proton-Proton Collisions at $\sqrt{s}$ = 13 TeV

CMS Collaboration; Hayrapetyan, A.; Makarenko, V.; Tumasyan, A.; Adam, W.; Benato, L.; Bergauer, T.; Dragicevic, M.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Matthewman, M.; Schieck, J.; Schöfbeck, R.; Shooshtari, M.; Sonawane, M.; Van Den Bossche, N.; ... mehr

Abstract:

Evidence of the production of two 𝑍 bosons and a photon in proton-proton collisions is reported for the first time in CMS. The analysis uses data collected by the CMS experiment between 2016 and 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138  fb$^{−1}$. Evidence for the process 𝑝⁢𝑝→𝑍⁢𝑍⁢𝛾→4⁢ℓ⁢𝛾 (ℓ =𝑒, 𝜇), with an observed (expected) significance of 3.7 (3.1) standard deviations in a fiducial region defined by 𝑝$^𝛾_T$>20  GeV, |𝜂𝛾| <2.4, Δ⁢𝑅⁢(ℓ,𝛾)>0.5, 𝑚$_𝑍$ between 60 and 120 GeV, and the invariant mass of either of the two 𝑍 bosons combined with the photon (𝑚$_{𝑍𝛾}$) larger than 100 GeV, is reported. The measured (predicted) fiducial cross section is 60$^{+27}_{−22}$  ab (47.56±0.04  ab). Additionally, the inclusive production of 𝑝⁢𝑝→4⁢ℓ⁢𝛾 is studied by removing the 𝑚$_{𝑍𝛾}$ requirement to include final state radiation where one 𝑍 boson decays to 2⁢ℓ⁢𝛾, yielding an observed (expected) significance of 5.0 (4.2) standard deviations and a measured (predicted) fiducial cross section of 156$^{+39}_{−35}$  ab (99.97±0.09  ab).


Verlagsausgabe §
DOI: 10.5445/IR/1000197204
Veröffentlicht am 22.09.2026
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Algebra und Geometrie (IAG)
Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2026
Sprache Englisch
Identifikator ISSN: 1079-7114, 0031-9007, 1092-0145
KITopen-ID: 1000197204
Erschienen in Physical Review Letters
Verlag American Physical Society (APS)
Band 137
Heft 9
Seiten Art.Nr: 091805
Vorab online veröffentlicht am 27.08.2026
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