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arxiv: 2606.20558 · v1 · pith:QBZ6SZRVnew · submitted 2026-06-18 · ✦ hep-ex

Observation of electroweak production of pairs of Z bosons in proton-proton collisions at 13 TeV

CMS Collaboration This is my paper

Pith reviewed 2026-06-26 14:52 UTC · model grok-4.3

classification ✦ hep-ex
keywords electroweak productionZ boson pairsZZjjproton-proton collisionsCMS experimentvector boson scatteringanomalous gauge couplings13 TeV
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The pith

The CMS experiment reports the first evidence for electroweak production of Z boson pairs with two jets in the dilepton missing-energy channel at 3.1 sigma significance.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper presents the first evidence of electroweak ZZjj production in proton-proton collisions at 13 TeV in the ZZ to ll nu nu jj decay channel. Events are selected by requiring exactly two same-flavor opposite-charge leptons, large missing transverse momentum, and two jets with large rapidity separation and large invariant mass. The measured fiducial cross section of 0.37 fb agrees with the standard model prediction of 0.39 fb. The observed significance is 3.1 standard deviations in this channel, rising to 5.0 standard deviations when combined with a prior four-lepton result. A sympathetic reader cares because the result tests a rare electroweak process involving vector boson interactions at high energy.

Core claim

The analysis observes electroweak production of pairs of Z bosons in association with two jets in the final state ZZjj to ll nu nu jj, where l equals e or mu. Using 138 inverse fb of 13 TeV proton-proton collision data, the fiducial electroweak cross section is measured as 0.37 plus 0.14 minus 0.12 statistical plus 0.06 minus 0.06 systematic fb, in agreement with the standard model prediction of 0.39 plus or minus 0.06 fb. The observed significance of the signal is 3.1 standard deviations. Limits on anomalous quartic gauge couplings are set using dimension-8 effective field theory operators. A combination with the previously reported four charged lepton channel result yields an observed sign

What carries the argument

The fiducial event selection with two opposite-charge same-flavor leptons, large missing transverse momentum, and two jets separated by large rapidity gap and large invariant mass, which isolates the electroweak signal component from dominant QCD backgrounds.

If this is right

  • The measured cross section agrees with the standard model prediction within uncertainties.
  • The signal reaches 3.1 standard deviations significance in the dilepton missing-energy channel.
  • Combining channels produces an observed significance of 5.0 standard deviations for electroweak ZZ pair production.
  • Limits are placed on dimension-8 effective field theory operators describing anomalous quartic gauge couplings.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • This result enables more precise studies of vector boson scattering to further test the mechanism of electroweak symmetry breaking.
  • Additional luminosity could strengthen constraints on beyond-standard-model effects in quartic gauge boson interactions.
  • The technique of combining multiple decay channels may extend to searches for other rare electroweak processes at higher energies.

Load-bearing premise

Background processes such as QCD-induced ZZjj and other standard model contributions are accurately modeled and subtracted so that any observed excess can be attributed to the electroweak signal.

What would settle it

If the number of selected events after all cuts deviates significantly from the sum of the modeled backgrounds plus the predicted electroweak signal, or if the extracted significance falls below 3 sigma with additional data under the same selection, the central claim would be challenged.

Figures

Figures reproduced from arXiv: 2606.20558 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: Example Feynman diagrams of the signal EW ZZ process (first three diagrams) and [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Distributions of the dijet invariant mass (left) and the flattened GNN discriminator [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The mT distribution (left) with the expected contribution from a T8 operator, showing SM case (dashed red) and fT8/Λ4 = 4TeV−4 (solid red). The vertical bars on the data points represent the statistical uncertainties. The expected and observed limits (right) at 95% CL are obtained from the likelihood fits. transverse mass (mT = p 2p Z T p miss T [1 − cos ∆ϕ(⃗p Z T ,⃗p miss T )]) as a distribution that is s… view at source ↗
read the original abstract

The first evidence of electroweak (EW) production of pairs of Z bosons in association with two jets (jj) in the final state ZZjj $\to$ $\ell\ell\nu\nu$jj, where $\ell$ = e, $\mu$, is reported by the CMS experiment. The analysis is based on a data sample of proton-proton (pp) collisions at $\sqrt{s}$ = 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 $\sigma_{\mathrm{EW}}$(pp $\to$ ZZjj $\to$ $\ell\ell\nu\nu$jj) = 0.37$^{+0.14}_{-0.12}$ (stat)$^{+0.06}_{-0.06}$ (syst) fb, in agreement with the standard model prediction of 0.39 $\pm$ 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.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The manuscript claims the first evidence of electroweak production of Z boson pairs associated with two jets in the ZZjj → ℓℓννjj channel at √s = 13 TeV with 138 fb^{-1} of CMS data. The fiducial cross section is measured to be 0.37^{+0.14}_{-0.12} (stat) ^{+0.06}_{-0.06} (syst) fb, in agreement with the SM prediction of 0.39 ± 0.06 fb. The observed significance is 3.1σ (expected 2.8σ), and combined with the four-lepton channel it reaches 5.0σ (4.5σ expected). Limits on anomalous quartic gauge couplings via dimension-8 EFT operators are also derived.

Significance. If the background modeling holds, this constitutes important evidence for electroweak ZZjj production, a key process for probing vector boson scattering and the electroweak symmetry breaking sector. The measured cross section agrees well with SM expectations, and the combined significance of 5σ provides strong support for the observation. The analysis in the dilepton + MET channel complements the previously reported four-lepton result, enhancing the overall sensitivity. The derivation of aQGC limits adds value for BSM searches.

major comments (1)
  1. [Abstract] Abstract: The 3.1σ standalone significance and the fiducial cross section measurement depend critically on the subtraction of the QCD ZZjj background in the signal region defined by large m_jj and |Δη_jj|. The abstract does not detail whether this background is constrained using data-driven methods in control regions, purely from Monte Carlo, or via a simultaneous fit, nor the magnitude of the associated systematic uncertainty. This information is essential to assess the robustness of attributing the observed excess to the electroweak component.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading and constructive feedback on our manuscript. We address the single major comment below and agree to make a targeted revision to improve clarity.

read point-by-point responses

  1. Referee: The 3.1σ standalone significance and the fiducial cross section measurement depend critically on the subtraction of the QCD ZZjj background in the signal region defined by large m_jj and |Δη_jj|. The abstract does not detail whether this background is constrained using data-driven methods in control regions, purely from Monte Carlo, or via a simultaneous fit, nor the magnitude of the associated systematic uncertainty. This information is essential to assess the robustness of attributing the observed excess to the electroweak component.

    Authors: We agree that the abstract is concise and would benefit from additional context on background treatment. In the analysis the QCD ZZjj background is modeled with Monte Carlo simulation (MadGraph5_aMC@NLO + Pythia) and its normalization is determined from a simultaneous fit to data in the signal region together with control regions at lower m_jj; the associated systematic uncertainty (approximately 20% on the background yield, arising from scale, shower, and PDF variations) is included in the total systematic uncertainty quoted for the cross section. These procedures are described in Sections 5 and 7. We will revise the abstract to include a brief statement on the background estimation method and its constraint in control regions. revision: yes

Circularity Check

0 steps flagged

No circularity: data-driven measurement with independent SM benchmarks

full rationale

The paper reports a cross-section measurement and significance extracted directly from 138 fb^{-1} of collision data via event counting, selection cuts, and background subtraction, then compared to an external SM prediction of 0.39 ± 0.06 fb. The 3.1σ (2.8σ expected) significance follows from the observed excess after subtraction. The combination with a prior four-lepton result is a post-hoc statistical addition of two independent channels and does not redefine or force the present-channel result. No equations, fits, or self-citations reduce any reported quantity to an input by construction; the derivation remains self-contained against external data and simulations.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The measurement rests on standard particle physics assumptions about background modeling and detector simulation rather than new free parameters or postulated entities; the central claim is the data-driven excess and its comparison to an external SM calculation.

axioms (1)
  • domain assumption Standard Model predictions and Monte Carlo simulations accurately describe background processes and detector response in the selected fiducial region
    Required for attributing the excess to the electroweak signal and for the quoted significance and cross section values.

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discussion (0)

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