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Searches for heavy diboson resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

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ATLAS Collaboration

High Energy Physics - Experiment · Submitted 15 Jun 2016 · 97 references

Pith's verdict: A solid, standard ATLAS diboson resonance search on the first 3.2 fb^-1 at 13 TeV; the exclusions are real and the soft spots are the usual ones, neither load-bearing.

T0 · AI review

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arXiv ID1606.04833 (version 2)
Pith IDFX2DKK6Q, Pith's permanent record of this paper and its review
CitationATLAS Collaboration. "Searches for heavy diboson resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector." arXiv:1606.04833 (2016). https://pith.science/paper/FX2DKK6Q
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The paper

The paper claims

ATLAS finds no diboson resonances in the first 13 TeV data, and converts the null result into mass exclusions reaching 2.65 TeV for a scalar singlet, 2.6 TeV for a heavy vector triplet, and 1.1 TeV for a warped graviton.

The reading

The paper asks whether the 13 TeV proton–proton collisions recorded by ATLAS in 2015 contain a heavy particle that decays into a pair of W or Z bosons. It answers by combining four mutually exclusive event selections — $qqqq$, $qqqq$ with missing energy ($qqqq$ replaced by $qqqq$; specifically $qqqq$, $qqqq$, $qqqq$, $qqqq$ meaning fully hadronic, missing-transverse-momentum, one-lepton and two-lepton plus hadronic-jet final states) — each of which reconstructs at least one highly boosted W or Z as a single large-radius jet and identifies it through its mass and two-prong substructure. No bump appears above the smoothly falling Standard Model backgrounds in any channel, so the paper turns the absence into 95% confidence-level upper limits on production cross-section times branching ratio as a function of resonance mass. Read against three named benchmark models, those limits translate into concrete exclusions: a CP-even scalar singlet below 2650 GeV in the Unsuppressed scenario, a heavy vector-boson triplet in model-B with $g_V = 3$ below 2600 GeV, and a bulk Randall–Sundrum graviton with $c = 1$ below 1100 GeV. The value to a reader is that these are the reach statements that matter for model builders: the 8 TeV run excluded the corresponding EGM $W'$ only below 1.81 TeV and the bulk graviton only below 810 GeV, so the same logic applied to 3.2 fb$^{-1}$ at higher energy roughly doubles the graviton reach and pushes the vector-triplet reach past 2.5 TeV.

What carries the argument

Three pieces of machinery carry the argument. First, boosted-boson tagging: hadronically decaying W and Z bosons are reconstructed as trimmed large-radius jets with $p_T > 200$ GeV, selected by a mass window of $pm 15$ GeV around the measured W (83.2 GeV) or Z (93.4 GeV) peak together with a $p_T$-dependent cut on the two-prong observable $D_2^{beta=1}$, tuned to about 50% efficiency on longitudinally polarised bosons while rejecting more than 90% of quark and gluon jets. Second, channel-specific background estimation: the semileptonic channels use simulated W+jets, Z+jets, $tbar{t}$ and diboson shapes with normalisations constrained by dedicated control regions inside the same fit, while the fully hadronic channel, dominated by multi-jet events, models the $m_{JJ}$ spectrum with the four-parameter form $f(x) = N(1-x)^{p_2+xi p_3} x^{p_3}$ with $x = m_{JJ}/sqrt{s}$, validated on simulated dijet samples and on data sidebands with the boson mass window shifted to 110–140 GeV or 50–65 GeV. Third, the statistical combination: a product of Poisson likelihoods across channels and discriminant bins, with nuisance parameters for jet energy and mass scale and resolution, background modelling, luminosity and signal acceptance, turned into limits through the asymptotic distributions of the profile-likelihood-ratio test statistic.

Extended reading notes

Core claim

The central claim is a set of exclusions, not a detection. Combining the $qqqq$, $qqqq$, $qqqq$ and $qqqq$ channels in a profile-likelihood fit with the modified-frequentist $CL_s$ prescription, ATLAS observes no significant deviation from the Standard Model; the largest local excess is 2.5 standard deviations, in the scalar selection near 1.6 TeV, and it is not claimed as evidence. The quoted 95% CL lower mass limits are 2650 GeV for the scalar singlet in the Unsuppressed benchmark, 2600 GeV for the HVT model-B triplet with $g_V = 3$, and 1100 GeV for the bulk Randall–Sundrum graviton with $c = 1$. The paper also reports model-independent limits on cross-section times branching ratio into $WW$ and $ZZ$ as a function of mass, and recasts them as exclusion contours in the scalar coupling plane $(c_H/$, $c_3/$) and in the HVT coupling plane $(g^2 c_F/g_V, g_V c_H)$, so that a reader with a different parameter choice can read off whether their point survives.

Load-bearing premise

The high-mass reach rests on the fully hadronic channel, and that channel assumes the entire multi-jet background follows one smooth four-parameter curve fitted to the very mass spectrum used to set the limit, with only simulated dijet events and shifted-mass sidebands as validation.

Editorial extensions

If this is right

  • Any model predicting a colour-singlet resonance that decays to $WW$, $WZ$ or $ZZ$ with a narrow width and a mass below roughly 2.6 TeV now has to survive these limits or explain why its production or branching ratio falls below them.
  • The bulk Randall–Sundrum graviton with $c = 1$ is pushed above 1.1 TeV, roughly a factor 1.4 beyond the 8 TeV exclusion of 810 GeV, which tightens the curvature-scale window that warped-extra-dimension model builders can still occupy.
  • The published cross-section limits as a function of mass and the coupling-plane contours let anyone re-derive an exclusion for a benchmark the paper did not tabulate, without redoing the analysis.
  • The 2.5 standard deviation local excess near 1.6 TeV in the scalar selection becomes a concrete target: more luminosity at 13 TeV either confirms a bump there or removes it.
  • The demonstrated combination of fully hadronic and semileptonic diboson channels at 13 TeV sets the template that later, larger datasets extend simply by rescaling the same selections.

Reading between the lines

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

  • The exclusion pattern is driven less by statistics than by kinematics: because a 2.6 TeV resonance produces W and Z bosons with transverse momenta of order a TeV, the boosted-jet technique is what converts a modest 3.2 fb$^{-1}$ into TeV-scale reach, so further gains should come from tagger efficiency at the highest $p_T$ rather than from luminosity alone.
  • The three benchmark exclusions are not equally robust: the scalar and graviton limits lean on the fully hadronic channel at high mass, where the background is a fitted functional form rather than a simulated or data-driven template, whereas the vector-triplet limit draws on all four channels. A reader comparing the three numbers should weight them differently.
  • Because the limits are quoted for narrow resonances, a broad or strongly interfering resonance of the same mass could hide inside these bounds; the coupling-plane contours already hint at where the narrow-width assumption starts to bite through the 5% width ellipse.
  • The absence of any excess in the $qqqq$ channel at 13 TeV, where the 8 TeV combination had a 2.5 standard deviation bump near 2 TeV, is itself informative: it suggests that earlier feature was a fluctuation rather than a signal.
Original abstract

Searches for new heavy resonances decaying to $WW$, $WZ$, and $ZZ$ bosons are presented, using a data sample corresponding to 3.2 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting $\nu\nu qq$, $\ell\nu qq$, $\ell\ell qq$ and $qqqq$ final states are combined, searching for a narrow-width resonance with mass between 500 and 3000 GeV. The discriminating variable is either an invariant mass or a transverse mass. No significant deviations from the Standard Model predictions are observed. Three benchmark models are tested: a model predicting the existence of a new heavy scalar singlet, a simplified model predicting a heavy vector-boson triplet, and a bulk Randall-Sundrum model with a heavy spin-2 graviton. Cross-section limits are set at the 95% confidence level and are compared to theoretical cross-section predictions for a variety of models. The data exclude a scalar singlet with mass below 2650 GeV, a heavy vector-boson triplet with mass below 2600 GeV, and a graviton with mass below 1100 GeV. These results significantly extend the previous limits set using $pp$ collisions at $\sqrt{s}=8$ TeV.

The compiled record

The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 6,450 input tokens.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.21 · human participants 0.01 · controlled comparison 0.26 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.97 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

Searches for new heavy resonances decaying to $WW$, $WZ$, and $ZZ$ bosons are presented, using a data sample corresponding to 3.2 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting $\nu\nu qq$, $\ell\nu qq$, $\ell\ell qq$ and $qqqq$ final states are combined, searching for a narrow-width resonance with mass between 500 and 3000 GeV. The discriminating variable is either an invariant mass or a transverse mass. No significant deviations from the Standard Model predictions are observed. Three benchmark models are tested: a model predicting the existence of a new heavy scalar singlet, a simplified model predicting a heavy vector-boson triplet, and a bulk Randall-Sundrum model with a heavy spin-2 graviton. Cross-section limits are set at the 95% confidence level and are compared to theoretical cross-section predictions for a variety of models. The data exclude a scalar singlet with mass below 2650 GeV, a heavy vector-boson triplet with mass below 2600 GeV, and a graviton with mass below 1100 GeV. These results significantly extend the previous limits set using $pp$ collisions at $\sqrt{s}=8$ TeV.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 Searches for new heavy resonances decaying to $WW$, $WZ$, and $ZZ$ bosons are presented, using a data sample corresponding to 3.2 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV collected with the ATLAS detector at the CERN Large Hadron Collider. contribution 0.84 0.94 0.03 asserted 0.98
s1 Analyses selecting $\nu\nu qq$, $\ell\nu qq$, $\ell\ell qq$ and $qqqq$ final states are combined, searching for a narrow-width resonance with mass between 500 and 3000 GeV. method 0.95 0.94 0.02 asserted 0.95
s2 The discriminating variable is either an invariant mass or a transverse mass. method 1.00 0.75 0.02 asserted 0.97
s3 No significant deviations from the Standard Model predictions are observed. result 1.00 0.94 0.76 asserted 0.99
s4 Three benchmark models are tested: a model predicting the existence of a new heavy scalar singlet, a simplified model predicting a heavy vector-boson triplet, and a bulk Randall-Sundrum model with a heavy spin-2 graviton. method 0.80 0.82 0.03 asserted 0.93
s5 Cross-section limits are set at the 95% confidence level and are compared to theoretical cross-section predictions for a variety of models. result 0.58 0.94 0.05 asserted 1.00
s6 The data exclude a scalar singlet with mass below 2650 GeV, a heavy vector-boson triplet with mass below 2600 GeV, and a graviton with mass below 1100 GeV. result 0.99 0.96 0.68 asserted 1.00
s7 These results significantly extend the previous limits set using $pp$ collisions at $\sqrt{s}=8$ TeV. interpretation 0.81 0.58 0.08 asserted 1.00

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.73.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

Figures
Figure 1. Signal acceptance times efficiency as a function of the resonance mass, for the different channels contrib￾uting to the searches for (a) a scalar resonance decaying to WW and ZZ, (b) HVT decaying to WW and WZ and (c) bulk RS gravitons decaying to WW and ZZ. The branching ratio of the new resonance decaying to dibosons is included in the denominator of the efficiency calculation. The coloured bands represent the total statistical and systematic uncertainties. In the case of the qqqq channel, only signals with resonance masses beyond 1.2 TeV, for which the mass peak is fully…
Figure 2. Distribution of the data compared to the background estimate for the analysis discriminant in the signal regions for the HVT search; (a) the mJJ distribution in the qqqq channel, (b) the mT distribution in the ννqq channel, (c) m`νJ in the `νqq channel, and (d) m``J in the ``qq channel. The “Top quark” distribution includes both the tt and single-top-quark backgrounds. The upper panels show the distribution of the observed data and estimated backgrounds as a function of the analysis discriminants. The observed data are shown as points, solid colours represent the different…
Figure 3. Distribution of the data compared to the background estimate for the analysis discriminant in the signal regions for the scalar and bulk RS G ∗ searches; (a) the mJJ distribution in the qqqq channel, (b) the mT distribution in the ννqq channel, (c) m`νJ in the `νqq channel, and (d) m``J in the ``qq channel. The “Top quark” distribution includes both the tt and single-top-quark backgrounds. The upper panels show the distribution of the observed data and estimated backgrounds as a function of the analysis discriminants. The observed data are shown as points, solid colours represent…
Figure 4. Observed and expected 95% CL limits on the cross-section times branching ratio to diboson final states for a narrow-width scalar resonance, as a function of its mass, combining the WW and ZZ decay modes. and that the ratio of the expected cross-section limit to the theoretical cross-section improves by a factor two for triplet masses of 2 TeV. 19
Figure 5. Observed 95% CL exclusion contours in the parameter space (cH/Λ, c3/Λ) for scalar resonances of mass 1 TeV, 2 TeV and 3 TeV. The region inside each green ellipse indicates, for the corresponding assumed mass, the part of the parameter space in which the ratio of the resonance’s total width Γ to its mass m is below 5%, which is comparable to the experimental mass resolution. Points inside the ellipse, but where the absolute values of the cH/Λ and c3/Λ parameters are larger than at the exclusion contour, are considered to be excluded at a CL greater than 95%. The solid lines…
Figure 6. The observed and expected 95% CL limits on the cross-section times branching ratio to diboson final states for the HVT scenario, compared to the theoretical predictions for the HVT model-A with gV = 1 (red line) and model-B with gV = 3 (purple line). Hc v g −3 −2 −1 0 1 2 3 v /g F c 2 g −1 −0.8 −0.6 −0.4 −0.2 0 0.2 0.4 0.6 0.8 1 ATLAS -1 s = 13 TeV, 3.2 fb 1.2 TeV 2.0 TeV 3.0 TeV =1) v A(g =3) v B(g m > 5% Γ
Figure 7. Observed 95% CL exclusion contours in the HVT parameter space (g 2 cF/gV, gVcH) for resonances of mass 1 TeV, 2 TeV and 3 TeV. Parameters for the benchmark models-A and -B are also shown. The grey area indicates the part of the parameter space in which the ratio of the resonance’s total width Γ to its mass m is higher than 5%, which is comparable to the experimental mass resolution. 21
Figure 8. The observed and expected 95% CL limits on the cross-section times branching ratio to diboson final states for bulk RS G ∗ , compared to the theoretical prediction for κ/M¯ Pl = 1 (red line). 22

Figures reproduced from arXiv:1606.04833 by the authors.

References
How later papers used it

57 later papers cite it

Evidence: substantial. 55 of the citing papers share no author with it, and 12 of those carry a confident label from Pith's citation classifier.

Pith read 15 of the 82 citing sentences, choosing only those whose citation markers point at this paper alone, and wrote the paraphrases from them. The summary, the counts, the evidence level, the links and the quotes come from code; the summary counts the papers listed below. A later paper is listed under a label when Pith's citation classifier gives one of its sentences that label at probability 0.8 or more (0.95 for support), Pith's reading finds that the citing paper itself did it, and a second check confirms the paraphrase against the sentence. This section lists uses only. It does not list criticism or disagreement, so their absence here says nothing about how the paper has been received. Papers that share an author with this one are listed apart, under "By the same authors". A quote is the citing authors' own sentence, shown when their paper's licence is CC BY, CC BY-SA or CC0. JSON

Compares with it 1 paper

  • Reported its own efficiency of 0.053 for a W' to WZ diboson signal with M_W' = 2 TeV as close to this paper's reported efficiency of around 0.06 for a W' boson signal of this mass.

    Traces of a triboson resonance (2016) · 1.00 · paraphrased: the licence does not allow quoting

How the literature uses it

57 arXiv papers cite this in 82 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 51 sentences without a confident label

Uses its method or tool 2 papers
Uses its data or values 9 papers
Compares with it 1 paper
  • This value is slightly larger than the efficiency of 0.05 found by the ATLAS Collaboration for this type of signal [ref] .

    Traces of a triboson resonance · ATLAS $ννJ$ diboson channel · 1.00

Cites it as background 15 papers

Discussion

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