Measurement of differential ZZ + jets production cross sections in pp collisions at $$ \sqrt{s} $$ = 13 TeV

A bstract Diboson production in association with jets is studied in the fully leptonic final states, pp → (Z/ γ * )(Z/ γ * ) + jets → 2 ℓ 2 ℓ ′ + jets, ( ℓ , ℓ ′ = e or μ ) in proton-proton collisions at a center-of-mass energy of 13 TeV. The data sample corresponds to an integrated luminosity of 138 fb − 1 collected with the CMS detector at the LHC. Differential distributions and normalized differential cross sections are measured as a function of jet multiplicity, transverse momentum p T , pseudorapidity η , invariant mass and ∆ η of the highest- p T and second-highest- p T jets, and as a function of invariant mass of the four-lepton system for events with various jet multiplicities. These differential cross sections are compared with theoretical predictions that mostly agree with the experimental data. However, in a few regions we observe discrepancies between the predicted and measured values. Further improvement of the predictions is required to describe the ZZ+jets production in the whole phase space.

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