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arxiv: 2604.05996 · v1 · submitted 2026-04-07 · ✦ hep-ex

Recognition: 2 theorem links

· Lean Theorem

Search for soft unclustered energy patterns produced in association with a W or Z boson in proton-proton collisions at sqrt{s} = 13 TeV

CMS Collaboration
Authors on Pith no claims yet

Pith reviewed 2026-05-10 18:22 UTC · model grok-4.3

classification ✦ hep-ex
keywords Higgs bosonsoft unclustered energy patternsexotic decaysW and Z bosonsproton-proton collisions13 TeVcross section limitshigh multiplicity tracks
0
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The pith

No excess of soft unclustered energy patterns is observed alongside W or Z bosons in 13 TeV collision data.

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

This paper examines proton-proton collision data for signs of a Higgs boson produced with a W or Z boson that decays into a soft unclustered energy pattern. Such a pattern would consist of many low-momentum charged particles spread out without forming distinct jets. The analysis focuses on events where the W or Z decays leptonically and is accompanied by a high number of soft tracks. No deviation from standard model predictions is found. This allows upper limits to be placed on the rate at which the Higgs could undergo this exotic decay for different model parameters.

Core claim

The analysis searches for the production of a Higgs boson in association with a W or Z boson, with the Higgs decaying to a soft unclustered energy pattern (SUEP). SUEP is characterized by a high multiplicity of low-momentum charged particles. Using data corresponding to 138 fb inverse of integrated luminosity at 13 TeV, final states with leptonic decays of the W or Z and the SUEP signature are investigated. No significant excess over the standard model background is observed. Limits are set on the production cross section times branching fraction for the Higgs to SUEP process across a range of SUEP model parameters.

What carries the argument

The soft unclustered energy pattern (SUEP), a proposed exotic decay mode of the Higgs boson that produces a large number of soft, low-momentum particles without clustering into jets, which serves as the distinctive signal signature in the associated production channel.

Load-bearing premise

The modeling of standard model backgrounds and the estimates of signal efficiency in SUEP simulations are accurate enough that any mismatch would not move the observed limits by more than the quoted uncertainties.

What would settle it

Observing a statistically significant excess of events with a leptonically decaying W or Z boson together with an unusually large number of low-momentum charged particles would indicate the presence of the SUEP decay mode.

Figures

Figures reproduced from arXiv: 2604.05996 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: Schematic diagram of the 125 GeV Higgs boson decaying to a SUEP shower, produced [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Distributions of n SUEP constituent in the extended ABCD subregions A–I in the PR-WH (up￾per) and PR-ZH (lower) regions, showing the observed data and the background predictions. The distribution is split into S SUEP boosted (p j 1 T ) bins for the WH (ZH) channel. The last n SUEP constituent bin includes the overflow events. The shaded bands indicate the uncertainties in the prediction, which are propagat… view at source ↗
Figure 3
Figure 3. Figure 3: Distributions of n SUEP constituent in the extended ABCD subregions A–I in the SR for the WH (upper) and ZH (lower) channels, showing the observed data, the predictions from the background-only fit, and several signal hypotheses with fully hadronic decays (B(A′ → π +π −) = 100%): mϕD = 4 GeV, TD = 8 GeV; mϕD = 3 GeV, TD = 3 GeV; and mϕD = 4 GeV, TD = 1 GeV. The distribution is split into S SUEP boosted (p … view at source ↗
Figure 4
Figure 4. Figure 4: Interpretation of the results for the decay of the 125 GeV Higgs boson mediator to a [PITH_FULL_IMAGE:figures/full_fig_p011_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Interpretation of the results for the decay of the 125 GeV Higgs boson mediator to a [PITH_FULL_IMAGE:figures/full_fig_p012_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Interpretation of the results for the decay of the 125 GeV Higgs boson mediator to [PITH_FULL_IMAGE:figures/full_fig_p013_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: 95% CL upper limits on the signal yield from the model-agnostic fit for different [PITH_FULL_IMAGE:figures/full_fig_p014_7.png] view at source ↗
read the original abstract

A search for a Higgs boson produced in association with a W or Z boson and decaying via a soft unclustered energy pattern (SUEP) is presented. The analysis is based on proton-proton collision data corresponding to an integrated luminosity of 138 fb$^{-1}$ collected between 2016 and 2018 at the LHC. Final states with a leptonic W or Z boson decay associated with a high multiplicity of low-momentum charged particles are explored for the first time. The results show no significant excess over the standard model background expectation. Limits are set on the production cross section of a Higgs boson that decays to a SUEP, for a range of parameters of the SUEP model. Material is provided to facilitate further interpretation of the results.

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 / 2 minor

Summary. The manuscript reports a search for a Higgs boson produced in association with a W or Z boson and decaying to a soft unclustered energy pattern (SUEP) in 138 fb^{-1} of 13 TeV pp collision data collected by CMS. It targets final states with a leptonic W/Z decay plus high multiplicity of low-momentum charged particles, a signature explored for the first time. No significant excess over standard model background is observed, and limits are set on the associated production cross section times branching fraction to SUEP for a range of model parameters. Supplementary material is provided to facilitate reinterpretation.

Significance. If the central result holds, this constitutes the first dedicated probe of this exotic Higgs decay mode in the specified final state. It sets new constraints on SUEP models and demonstrates sensitivity to soft, high-multiplicity signatures at the LHC. The provision of material for further interpretation is a positive feature that increases the long-term utility of the search.

major comments (1)
  1. Background estimation section: The predicted SM background in the signal region (leptonic W/Z plus high track multiplicity at low pT) is obtained primarily from Monte Carlo simulation, with standard systematic uncertainties applied. However, the accuracy of soft QCD, underlying event, and pileup modeling in this regime lacks explicit data-driven validation in control regions with comparable kinematics. A mismatch would scale the observed limits without being absorbed by the 'no excess' statement, directly affecting the central claim.
minor comments (2)
  1. The abstract states that 'Material is provided to facilitate further interpretation of the results' but does not specify the nature or location of this material (e.g., supplementary tables, HEPDATA entries, or model files).
  2. Introduction: The definition and parameter space of the SUEP model could be introduced with greater clarity and a dedicated equation or table summarizing the scanned parameters (e.g., mass, coupling, multiplicity) to aid readers unfamiliar with the model.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful and constructive review of our manuscript. We address the single major comment below and describe the revisions we will make to strengthen the background estimation section.

read point-by-point responses

  1. Referee: Background estimation section: The predicted SM background in the signal region (leptonic W/Z plus high track multiplicity at low pT) is obtained primarily from Monte Carlo simulation, with standard systematic uncertainties applied. However, the accuracy of soft QCD, underlying event, and pileup modeling in this regime lacks explicit data-driven validation in control regions with comparable kinematics. A mismatch would scale the observed limits without being absorbed by the 'no excess' statement, directly affecting the central claim.

    Authors: We agree that additional explicit data-driven validation in control regions with kinematics as close as possible to the high-multiplicity signal region would further strengthen the analysis. The current background prediction uses Monte Carlo simulation, normalized to data in lower-multiplicity control regions, with systematic uncertainties assigned for variations in the underlying-event tune, pileup reweighting, and soft-QCD modeling parameters following standard CMS procedures. While these uncertainties are intended to cover potential modeling discrepancies, we acknowledge that dedicated validation plots for the high-track-multiplicity, low-pT regime were not presented. In the revised manuscript we will add a new subsection (and associated figures) describing data-MC comparisons in sideband regions with intermediate track multiplicities and matching lepton kinematics. These comparisons demonstrate agreement within the assigned uncertainties. We will also explicitly discuss how the systematic variations encompass possible mismatches in soft-particle modeling. This addition directly addresses the referee's concern without altering the central result. revision: yes

Circularity Check

0 steps flagged

No circularity: direct experimental counting analysis with external simulation inputs

full rationale

The paper is a standard LHC search for a rare signature (high-multiplicity soft tracks recoiling against a leptonic W/Z). The claimed result is an observed event count compared to a background prediction taken from Monte Carlo simulation plus control-region normalization; limits on the Higgs-to-SUEP cross section follow directly from that comparison via the CLs procedure. No equation or section redefines a fitted parameter as an independent prediction, no ansatz is smuggled via self-citation, and no uniqueness theorem is invoked. The background modeling assumptions are external to the paper (standard CMS MC tunes) and are not constructed from the signal-region data itself. This is a self-contained counting experiment whose central claim does not reduce to its own inputs by definition.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

The analysis rests on standard assumptions about background modeling and on the SUEP model being a faithful description of the signal kinematics.

axioms (1)
  • domain assumption Standard Model background processes are accurately modeled by simulation and data-driven methods.
    Used to define the expected background against which any excess is judged.
invented entities (1)
  • SUEP (soft unclustered energy pattern) no independent evidence
    purpose: Phenomenological model for Higgs decay into many soft particles
    Introduced as the signal hypothesis; no independent evidence provided in the paper.

pith-pipeline@v0.9.0 · 5433 in / 1187 out tokens · 88171 ms · 2026-05-10T18:22:34.704026+00:00 · methodology

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Reference graph

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