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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 $\sqrt{s}$ = 13 TeV

T0 review · 0 major / 2 minor · reviewed 2026-07-01 · grok-4.3

Challenge this review Re-run · record.json Download PDF Read on arXiv ↗ Review JSON

Pith's one-line read No significant excess is observed in the search for a new heavy scalar resonance decaying to two Z bosons in four-lepton events.

desk verdict Routine CMS update on heavy scalar ZZ limits using full Run 2 data, with no excess and standard limit-setting. read the letter →

arxiv 2605.26462 v1 pith:OOSC4RXR submitted 2026-05-26 hep-ex

CMS Collaboration This is my paper · ORCID
classification hep-ex
keywords heavyscalarresonanceZbosonpairfour-leptonfinalstateupperlimitsnosignificantexcesssearchproton-protoncollisions
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper reports results from a search for a hypothetical new heavy scalar particle that decays into a pair of Z bosons, with each Z boson decaying further into electrons or muons. The analysis uses proton-proton collision data at 13 TeV corresponding to 138 inverse femtobarns and examines resonance masses from 130 GeV up to 3 TeV for both narrow and broad width cases. It accounts for gluon fusion and vector boson fusion production, plus interference effects in the broad scenario. No deviation from standard model background expectations appears in the data. This leads to upper limits at 95 percent confidence level on the product of production cross section and branching fraction to two Z bosons.

What carries the argument

Comparison of the four-lepton invariant mass distribution in data against modeled standard model backgrounds to extract statistical upper limits on possible resonant signals.

What would settle it

A statistically significant excess appearing in the four-lepton invariant mass spectrum above the predicted standard model background in this dataset.

Watch

Extended reading notes

Core claim

The search finds no significant excess with respect to the standard model background expectation in the examined phase space. Upper limits at the 95 percent confidence level are set on the product of the heavy scalar resonance production cross section and the branching fraction for its decay into two Z bosons. The exclusion limits range from 0.05 to 0.1 pb in the low-mass region to 0.00 pb in the high-mass region.

Load-bearing premise

The standard model background processes in the four-lepton final state are modeled with sufficient accuracy that any deviation would be attributable to a new resonance rather than mismodeling or unaccounted systematic effects.

Editorial extensions

If this is right

  • Any new heavy scalar must have a production cross section times branching fraction to ZZ below the reported limits across the mass range.
  • Both gluon-fusion and vector-boson-fusion production modes for such a resonance are constrained by the same limits.
  • Broad-width scenarios including interference with the 125 GeV Higgs boson are also excluded at the stated levels.
  • The standard model description of four-lepton events remains consistent with observation up to 3 TeV resonance masses.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • These limits can be combined with results from other decay channels to further restrict models containing additional scalar particles.
  • Higher integrated luminosity at future collider runs would directly improve the sensitivity in the same final state.
  • The analysis methods for handling interference in broad resonances provide a template for similar searches in other final states.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

0 major / 2 minor

Summary. The manuscript reports results from a search for a new heavy scalar resonance decaying to ZZ (with each Z to leptons) in the four-lepton final state. Using 138 fb^{-1} of 13 TeV pp collision data collected by CMS, the analysis covers resonance masses from 130 GeV to 3 TeV in both narrow- and broad-width scenarios, for gluon-fusion and vector-boson-fusion production modes. Interference with the 125 GeV Higgs and SM continuum is included for the broad-width case. No significant excess above the SM background expectation is observed, and 95% CL upper limits are placed on the product of production cross section and branching fraction to ZZ, ranging from 0.05-0.1 pb at low mass to 0 pb at high mass.

Significance. This is a standard, high-luminosity null-result search in a well-understood final state. When the background modeling and systematic treatment are accurate, the limits provide useful constraints on extended Higgs sectors. The explicit inclusion of interference effects for broad resonances and the use of established CMS statistical procedures (profile likelihood fits with data-driven corrections) are strengths that increase the robustness of the reported exclusion.

minor comments (2)
  1. [Results section] Figure 5 (or equivalent limit plot): the caption should explicitly state whether the shown curves include or exclude the interference term for the broad-width hypothesis, to avoid reader ambiguity when comparing to theory predictions.
  2. [Section 4] Section 4 (background estimation): the text states that ZZ continuum is modeled with MC plus data-driven corrections, but a short sentence quantifying the size of the correction in the high-mass tail would improve transparency.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript, recognition of its strengths in background modeling and statistical procedures, and recommendation to accept. No major comments were provided for response.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: standard experimental limit-setting from data

full rationale

This is a standard CMS experimental search paper reporting observed data compared to SM background predictions in the four-lepton channel. The central results (no excess observed; 95% CL upper limits on σ × B ranging 0.05–0.1 pb to 0 pb) are obtained via profile likelihood fits to data using MC-simulated backgrounds with data-driven corrections and established systematic uncertainties. No equations, self-citations, or ansatze reduce the reported limits to quantities defined by the result itself; the statistical procedure and background modeling are independent of the final limit values and remain externally falsifiable.

Assumptions & free parameters 0 free parameters · 1 assumptions · 0 invented entities

The analysis relies on standard model predictions for background and detector response but introduces no new free parameters, axioms beyond domain assumptions, or invented entities.

assumptions (1)
  • domain assumption Standard model processes accurately predict the background rate and shape in the four-lepton final state after all selections.
    The no-excess conclusion and derived limits rest on this background prediction being correct.

how reviews work

0 comments
Cite this review

Pith. "Pith review of 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 $\sqrt{s}$ = 13 TeV." pith.science (2026). https://pith.science/paper/OOSC4RXR

@misc{pith2026260526462,
  author       = {Pith},
  title        = {Pith review of: 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 $\sqrts$ = 13 TeV},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/OOSC4RXR}},
  note         = {Machine review of arXiv:2605.26462}
}
abstract

A search for a new heavy scalar resonance decaying to two Z bosons, each subsequently decaying to a pair of electrons or muons, is presented. The results are based on a proton-proton collision data set collected by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. The search is performed over a wide range of resonance masses from 130 GeV to 3 TeV, considering both narrow- and broad-width scenarios, and considering the gluon fusion and vector boson fusion production processes. For the broad-width scenario, the interference between the new resonance, the 125 GeV Higgs boson production, and the continuum background is taken into account. No significant excess with respect to the standard model background expectation is observed in the examined phase space. Upper limits at the 95% confidence level are set on the product of the heavy scalar resonance production cross section and the branching fraction for its decay into two Z bosons. The exclusion limits range from 0.05$-$0.1 pb in the low-mass region to 0.00 pb in the high-mass region.

Figures

Figures reproduced from arXiv: 2605.26462 by the authors.

Figure 1
Figure 1. Left: the mreco 4ℓ distributions for signal and background processes estimated from the MC simulation, alongside observed data. Red and pink open histograms show the lineshapes for different signal masses. Right: The Dkin bkg distributions for signal and background processes estimated from the MC simulation, together with the observed data. The masses of the X resonances written in the legends are in GeV units. The … view at source ↗
Figure 2
Figure 2. The DVBF 2jet distributions for signal, background, and observed data. Only events pass￾ing the lepton and jet multiplicity requirements for the VBF-tagged category are shown. The dotted vertical line represents the threshold of DVBF 2jet = 0.46. function (pdf) of the signal process is defined as Psig(m reco 4ℓ , D kin bkg|mX, ΓX) = {[M(m gen 4ℓ |mX, ΓX)ϵ(m gen 4ℓ )] ⊗ R(m reco 4ℓ |m gen 4ℓ )}P(D kin bkg|m reco 4ℓ )… view at source ↗
Figure 3
Figure 3. The product of signal efficiency and acceptance, as a function of [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figures from the paper (8 more)
Figure 4
Figure 4. Figure 4: The mreco 4ℓ distributions for several values of mX and ΓX obtained from the signal model, for the ggF (left) and VBF (right) signal processes. All final states and categories are combined. To build the 2D pdf, the conditional pdf P(Dkin bkg|mreco 4ℓ ) is obtained from…
Figure 5
Figure 5. Figure 5: Expected distributions of m gen 4ℓ vs. Dkin bkg for the ggF (left) and VBF (right) production mechanisms, in the 4µ final state. The distributions are estimated from the signal simulation. The signal model is validated by comparing it with the mreco 4ℓ distribution ext…
Figure 6
Figure 6. Figure 6: The left (right) plot depicts the lineshapes for the ggF (VBF) signal with [PITH_FULL_IMAGE:figures/full_fig_p015_6.png]
Figure 7
Figure 7. Figure 7: The mreco 4ℓ and Dkin bkg distributions with the 2016–2018 data set, for backgrounds and observed data. The distributions for backgrounds are extracted from the statistical model, with all nuisance parameters at their best fit values. The upper left (right) panel shows…
Figure 8
Figure 8. Figure 8: Observed and expected upper limits on σ(pp → X → ZZ) with mX from 130 GeV to 3 TeV in the narrow-width approximation, for the ggF (upper left) and VBF (upper right) production, and with fVBF as a free parameter in the fit (lower). theories [79, 80]. No such excess is f…
Figure 9
Figure 9. Figure 9: Local p-value as a function of mX, with fVBF floating. Broad-width assumptions are also tested, with ΓX fixed to 1, 10, or 100 GeV. The results are shown in [PITH_FULL_IMAGE:figures/full_fig_p021_9.png]
Figure 10
Figure 10. Figure 10: Observed and expected upper limits on σ(pp → X → ZZ) with mX from 130 GeV to 3 TeV and ΓX equal to 1 (upper), 10 (middle), and 100 (lower) GeV. The left column shows the results for pure ggF production and the right column shows the results for pure VBF produc￾tion. C…
Figure 11
Figure 11. Figure 11: Observed and expected 95% CL upper limits on [PITH_FULL_IMAGE:figures/full_fig_p024_11.png]

Discussion (0). Continue with ORCID to comment.

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Pith tools

Reviewed July 1, 2026 · model on record in the stance chip above.