Observation of electroweak production of pairs of Z bosons in proton-proton collisions at 13 TeV
Abstract
The first evidence of electroweak (EW) production of pairs of Z bosons in association with two jets (jj) in the final state ZZjj → ℓℓννjj, where ℓ = e, μ, is reported by the CMS experiment. The analysis is based on a data sample of proton-proton (pp) collisions at √s = 13 TeV, corresponding to an integrated luminosity of 138 fb−1. Events are selected by requiring exactly two leptons of same flavor and opposite charge, large missing transverse momentum, and two jets with a large rapidity separation and large invariant mass. The EW production cross section in a fiducial volume is σEW(pp → ZZjj → ℓℓννjj) = 0.37 +0.14−0.12 (stat) +0.06−0.06 (syst) fb, in agreement with the standard model prediction of 0.39 ± 0.06 fb. The observed (expected) significance of the signal is 3.1 (2.8) standard deviations. Limits on anomalous quartic gauge couplings are derived in terms of dimension-8 effective field theory operators. A combination with the previously reported result from the ZZ decay channel with four charged leptons yields an observed (expected) significance of 5.0 (4.5) standard deviations for the EW production of Z boson pairs.
Versions
Related
- Search for the nonresonant production of a pair of additional Higgs bosons in the type-X two-Higgs-doublet model in proton-proton collisions at √s = 13 TeV
- Observation of single top-quark production in the s-channel in proton--proton collisions at √s=13 TeV with the ATLAS detector
- Search for a new heavy scalar resonance decaying to a pair of Z bosons in the four-lepton final state in proton-proton collisions at √s = 13 TeV
- Search for pair-produced vector-like top quarks decaying into Lorentz-boosted top quarks and scalar bosons in proton-proton collisions at √s = 13 TeV
- Search for a new heavy scalar resonance decaying to a pair of Z bosons in the four-lepton final state in proton-proton collisions at √s=13 TeV
BibTeX
@misc{collaboration2026observation,
title = {{Observation of electroweak production of pairs of Z bosons in proton-proton collisions at 13 TeV}},
author = {CMS Collaboration},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2606.20558},
eprint = {2606.20558},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.20558},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Observation of electroweak production of pairs of Z bosons in proton-proton collisions at 13 TeV
AU - CMS Collaboration
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2606.20558
UR - https://arxiv.org/abs/2606.20558
AB - The first evidence of electroweak (EW) production of pairs of Z bosons in association with two jets (jj) in the final state ZZjj → ℓℓννjj, where ℓ = e, μ, is reported by the CMS experiment. The analysis is based on a data sample of proton-proton (pp) collisions at √s = 13 TeV, corresponding to an integrated luminosity of 138 fb^−1. Events are selected by requiring exactly two leptons of same flavor and opposite charge, large missing transverse momentum, and two jets with a large rapidity separation and large invariant mass. The EW production cross section in a fiducial volume is σ_EW(pp → ZZjj → ℓℓννjj) = 0.37 ^+0.14_−0.12 (stat) ^+0.06_−0.06 (syst) fb, in agreement with the standard model prediction of 0.39 ± 0.06 fb. The observed (expected) significance of the signal is 3.1 (2.8) standard deviations. Limits on anomalous quartic gauge couplings are derived in terms of dimension-8 effective field theory operators. A combination with the previously reported result from the ZZ decay channel with four charged leptons yields an observed (expected) significance of 5.0 (4.5) standard deviations for the EW production of Z boson pairs.
ER -