Compact Muon Solenoid
LHC, CERN
Visit us: CMS Public Website, CMS Physics ;
Contact us: CMS Publications Committee
| CMS-PAS-SMP-23-001 | ||
| Observation of electroweak production of pairs of Z bosons in proton-proton collisions at 13 TeV with the CMS detector | ||
| CMS Collaboration | ||
| 2026-03-20 | ||
| Abstract: The CMS experiment reports the first evidence of electroweak (EW) production of pairs of Z bosons in association with two jets (jj) in the final state $ \mathrm{ZZjj} \to \ell\ell\nu\nu $ jj, where $ \ell = e, \mu $. The analysis is based on a data sample of proton--proton collisions at $ \sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. Events are selected by requiring exactly two same-flavor, oppositely charged leptons, large missing transverse momentum, and two jets with a large rapidity separation and large dijet mass. The observed (expected) significance of the signal is 3.1 (2.8) standard deviations. The EW production cross section in a fiducial volume is $ \sigma_{\mathrm{EW}} $(pp $ \to $ ZZjj $ \to \ell\ell\nu\nu $ jj) = $ $ 0.37 $ ^{+0.14}_{-0.12} $ (stat) $ \pm $ 0.06 (syst) $ \mathrm{fb} $, in agreement with the standard model prediction of 0.39 $ \pm $ 0.06 $ \mathrm{fb} $. Limits on anomalous quartic gauge couplings are derived in terms of dimension-8 effective field theory operators. In combination with the previously reported result from the decay channel with four charged leptons, the observed (expected) significance is 5.0 (4.5) standard deviations. | ||
| Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; | ||
|
|
Compact Muon Solenoid LHC, CERN |
|
|
|
|
|
|