Evidence of; ; ; Z; Z; γ; ; ; Production and Observation of; ; ; 4; ℓ; γ; ; ; in Proton-Proton Collisions at; ; ; ; ; s; ; ; =; 13; ; ; TeV; ;
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abstract
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; 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; ; ; T; ; ; γ; ; ; >; 20; ; ; GeV; ; ; ,; ; ; ; -; ; ; η; ; ; γ; ; ; -; ; <; 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; ; ; ; ; Z; ; ; γ; ; ; ; ; ; ; ) larger than 100 GeV, is reported. The measured (predicted) fiducial cross section is; ; ; ; ; 60; ; ; −; 22; ; ; +; 27; ; ; ; ; ; ab; ; ; ; (; ; ; 47.56; ±; 0.04; ; ; ; ab; ; ; ; ). Additionally, the inclusive production of; ; ; p; p; →; 4; ℓ; γ; ; ; is studied by removing the; ; ; ; ; m; ; ; ; ; Z; ; ; γ; ; ; ; ; ; ; 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; ; ; −; 35; ; ; +; 39; ; ; ; ; ; ab; ; ; ; (; ; ; 99.97; ±; 0.09; ; ; ; ab; ; ; ; ).;
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September 2, 2026 5:03 AM
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Hayrapetyan A; Makarenko V; Tumasyan A; Adam W; Benato L; Bergauer T; Dragicevic M; Hussain PS; Jeitler M; Krammer N
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