REVIEW
Scale-invariant resonance tagging in multijet events and new physics in Higgs pair production
High Energy Physics - Phenomenology · Submitted 26 Mar 2013 · 99 references
Pith's verdict: A genuinely useful tagging scheme with a clean analytic core; the 'uniform background rejection' claim is the one place it oversells, and the authors half-admit it in a footnote.
T0 · AI review
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Referee report
The paper
The paper claims
The paper proposes a single jet-tagging scheme that classifies events by how many mass-drop tags they contain, so that boosted and resolved resonance decays are handled by one analysis with roughly constant efficiency.
The reading
What carries the argument
The load-bearing object is the mass ratio $r_M=M_X/(2M_Y)$ and the tag-count taxonomy built around it. Each of the two hardest anti-$k_t$ jets is reclustered with the Cambridge/Aachen algorithm at radius 1.3 and passed through the BDRS mass-drop tagger ($μ=0.67$, $y_{cut}=0.09$); events with two tags are treated as two boosted $Y$ candidates, events with one tag as a mixed 1-tag topology, and events with no tags as a resolved four-jet topology. Common quality cuts on the two candidate masses, their rapidity separation, the separation of resolved subjets, and the subjet $p_T$ asymmetry enforce the same logic in all three categories. Filtering with three subjets improves the mass resolution. This machinery is what turns an unknown boost into a discrete tag count and makes the efficiency curve flat.
Extended reading notes
Core claim
The central claim is that a resonance-pair tagger built from the number of BDRS mass-drop tags smoothly interpolates between the boosted and resolved regimes, so that no separate analyses are needed. In the toy study, the combined efficiency stays between about 30% and 40% at parton level and 20% to 30% at hadron level across $r_M$ from 1 to 20; the QCD mistag probability is approximately scale invariant and, after requiring one $b$ tag per Higgs candidate, falls to about $10^{-4}$. Applied to $HH→4b$, the tagger plus $b$ tagging gives a roughly 15% signal efficiency in the relevant mass range, and the resulting 95% CL exclusion reach is about 200 fb at 500 GeV and about 1 fb at 2 TeV for 8 TeV with 25 fb$^{-1}$, with the 14 TeV and 500 fb$^{-1}$ projection reaching about 50 fb at 500 GeV. The paper presents this as evidence that the $4b$ channel can complement other Higgs-pair searches despite the QCD background.
Load-bearing premise
The load-bearing premise is that the Pythia8 multijet background used to estimate mistags is representative enough that the quoted exclusion reach survives the factor-of-two uncertainty the authors note in multijet topology rates, together with the leading-order and $b$-tagging modeling choices.
Editorial extensions
If this is right
- A single analysis can cover resonance masses from the fully resolved threshold up to the highly boosted regime, replacing separate boosted and resolved searches.
- The $HH→4b$ channel can set 95% CL limits on $σ(pp→X) BR(X→HH)$ of order 200 fb at 500 GeV and 1 fb at 2 TeV at the 8 TeV LHC with 25 fb$^{-1}$.
- At 14 TeV with 500 fb$^{-1}$, the same channel reaches about 50 fb at 500 GeV and can probe bulk radion and bulk graviton scenarios over broad mass ranges.
- The tag-count method is general for $pp→X→2Y→4z$ and can be adapted to other pair-produced resonances, including top-quark pairs.
Reading between the lines
- Because the tag fractions themselves vary smoothly with $r_M$, they could be used as a data-driven calibration of initial-state radiation and underlying-event modeling, rather than only as a signal selector.
- The same tag-count logic could supply a background estimate directly from data: measure the 2-tag, 1-tag, and 0-tag yields in sidebands and extrapolate into the signal mass window, reducing dependence on the Pythia8 multijet rate.
- If the efficiency really is scale invariant, an experimental analysis could quote a single efficiency curve for all resonance masses and treat the tag-count migration as a systematic uncertainty, which would simplify combinations across channels.
Original abstract
We study resonant pair production of heavy particles in fully hadronic final states by means of jet substructure techniques. We propose a new resonance tagging strategy that smoothly interpolates between the highly boosted and fully resolved regimes, leading to uniform signal efficiencies and background rejection rates across a broad range of masses. Our method makes it possible to efficiently replace independent experimental searches, based on different final state topologies, with a single common analysis. As a case study, we apply our technique to pair production of Higgs bosons decaying into $b\bar{b}$ pairs in generic New Physics scenarios. We adopt as benchmark models radion and massive KK graviton production in warped extra dimensions. We find that despite the overwhelming QCD background, the $4b$ final state has enough sensitivity to provide a complementary handle in searches for enhanced Higgs pair production at the LHC.
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.
The abstract, sentence by sentence
We study resonant pair production of heavy particles in fully hadronic final states by means of jet substructure techniques. We propose a new resonance tagging strategy that smoothly interpolates between the highly boosted and fully resolved regimes, leading to uniform signal efficiencies and background rejection rates across a broad range of masses. Our method makes it possible to efficiently replace independent experimental searches, based on different final state topologies, with a single common analysis. As a case study, we apply our technique to pair production of Higgs bosons decaying into $b\bar{b}$ pairs in generic New Physics scenarios. We adopt as benchmark models radion and massive KK graviton production in warped extra dimensions. We find that despite the overwhelming QCD background, the $4b$ final state has enough sensitivity to provide a complementary handle in searches for enhanced Higgs pair production at the LHC.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We study resonant pair production of heavy particles in fully hadronic final states by means of jet substructure techniques. | contribution 0.79 | 0.87 | 0.03 | asserted 0.93 |
| s1 | We propose a new resonance tagging strategy that smoothly interpolates between the highly boosted and fully resolved regimes, leading to uniform signal efficiencies and background rejection rates across a broad range of masses. | contribution 0.76 | 0.90 | 0.23 | asserted 0.96 |
| s2 | Our method makes it possible to efficiently replace independent experimental searches, based on different final state topologies, with a single common analysis. | contribution 0.53 | 0.53 | 0.14 | asserted 0.76 |
| s3 | As a case study, we apply our technique to pair production of Higgs bosons decaying into $b\bar{b}$ pairs in generic New Physics scenarios. | contribution 0.60 | 0.87 | 0.05 | asserted 0.81 |
| s4 | We adopt as benchmark models radion and massive KK graviton production in warped extra dimensions. | method 0.98 | 0.68 | 0.03 | asserted 0.95 |
| s5 | We find that despite the overwhelming QCD background, the $4b$ final state has enough sensitivity to provide a complementary handle in searches for enhanced Higgs pair production at the LHC. | result 0.91 | 0.95 | 0.80 | asserted 0.99 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
Figures
Figures reproduced from arXiv:1303.6636 by the authors.
References
How later papers used it
79 later papers cite it
4 later papers by other authors are listed below: 1 built on it and 3 used its method or tool. 2 more papers by the same authors are listed: 2 used its method or tool.
Builds on it 1 paper
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Significantly expanded on the proposals of this paper and other works in developing a reconstruction strategy for third-generation squarks.
Searching for supersymmetry scalelessly (2016) · 1.00 · paraphrased: the licence does not allow quoting
Uses its method or tool 5 of 8 papers with this label · 2 by the same authors
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Followed the scale-invariant tagging procedure of this paper, as implemented in a reference, to classify events by boosted Higgs candidate or resolved b-jet pair.
Revisiting $\mathbf{Vh(\rightarrow b \bar b)}$ at the LHC and FCC-hh (2022) · 1.00 · paraphrased: the licence does not allow quoting
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Since in our analysis, we combine these two classes of events, the tagging procedure we employ is a scale invariant one [ref] .
Improved Precision in $Vh(\rightarrow b\bar b)$ via Boosted Decision Trees (2024) · General setup of the physics analysis · 0.91
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The mass ranges are decided according to the kinematic properties and Lorentz-boost factor, estimated by the quantity $/(+)$ [ref] , which defines similar angular properties.
Search for a new resonance decaying into two spin-0 bosons in a final state with two photons and two bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV (2023) · Nonresonant background separation · 0.88
By the same authors
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Followed the scale-invariant resonance tagging method of this paper for its analysis strategy.
Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies (2016) (same authors) · 1.00 · paraphrased: the licence does not allow quoting
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Followed a strategy similar to the scale-invariant resonance tagging of this paper.
Boosting Higgs pair production in the $b\bar{b}b\bar{b}$ final state with multivariate techniques (2015) (same authors) · 0.99 · paraphrased: the licence does not allow quoting
How the literature uses it
78 arXiv papers cite this in 96 sentences
Papers whose main result relates to this one's
States the same result 1 paper
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We show using this strategy that the LHC has sensitivity to the enhanced resonant production of Higgs boson pairs decaying into $b\bar{b}$ pairs in generic New Physics scenarios.
Scale-Invariant Resonance Tagging in Multijet Final States · 0.93
Papers citing it · 59 sentences without a confident label
Builds on it 1 paper
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In this paper we develop a reconstruction strategy for third-generation squarks that accumulates sensitivity from a wide range of different phase space regions and for a variety of signal processes[We significantly expand on the proposals of [ref] and [ref] .
Searching for supersymmetry scalelessly · Introduction · 1.00
Uses its method or tool 7 papers
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These are reconstructed using jet substructure and jet flavour-tagging techniques [ref] .
Search for a massive resonance decaying to a pair of Higgs bosons in the four b quark final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV · Introduction · 0.98
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The analysis strategy follows the scale-invariant resonance tagging method of Ref. [ref] .
Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies · The $HH→bb̅bb̅$ channel · 1.00
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To this end, we follow the scale-invariant tagging procedure [ref] as implemented in ref.
Revisiting $\mathbf{Vh(\rightarrow b \bar b)}$ at the LHC and FCC-hh · Event generation and analysis · 1.00
Compares with it 1 paper
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However, the merging of $b$-jets would result in a different final state topology, aligning more closely with the one examined in Ref. [ref] .
Di-Higgs production via Axion-Like Particles · A smoking gun of the ALP-mediated di-Higgs production · 0.91
Cites it as support 4 papers
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As it can be seen and shown in [ref] , the combination of jet substructure techniques, b-tagging requirement, and invariant mass cuts reduces the contribution of the QCD multijet background negligible.
Double Higgs Production with a Jet Substructure Analysis to Probe Extra Dimensions · Event selection · 0.97
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The potential benefit of scale-invariant jet tagging has been noted in Refs. [ref] , motivating the addition of a zooming transformation to the jet preprocessing steps.
Meta-learning and data augmentation for mass-generalised jet taggers · Zooming · 0.99
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Recent phenomenological studies have demonstrated that despite the fully hadronic final state being subject to a large multijet background, searches for new physics in the process have good sensitivity for both resonant [ref] and non-resonant signals [ref] .
Search for Higgs boson pair production in the $b\bar{b} b\bar{b}$ final state from $pp$ collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector · Introduction · 0.96
Cites it as background 20 papers
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A series of studies have surveyed its observability in the $bb̅γγ$, $bb̅τ^+τ^-$, $bb̅W^+W^-$, $bb̅bb̅$, and $WW^*WW^*$ signal channels [ref] .
LHC Phenomenology of the Type II Seesaw Mechanism: Observability of Neutral Scalars in the Nondegenerate Case · Introduction · 0.90
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Numerous studies have also been performed for Higgs pair production in new physics models [ref] .
Higgs pair production with SUSY QCD correction: revisited under current experimental constraints · Introduction · 0.96
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Significant progress has been made in the studies on di-Higgs production considering either the higher-order radiative corrections within the SM, or the presence of a NP candidate [ref] .
Leptoquark-assisted Singlet-mediated Di-Higgs Production at the LHC · Introduction · 0.94
What it cites · 52 sentences without a confident label
Uses the method or tool of 7 papers
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Parton and hadron-level events were then clustered with the anti-$k_t$ jet algorithm [ref] with radius of $R=0.5$.
The anti-k_t jet clustering algorithm · Scale-invariant resonance tagging · 1.00
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We computed the production cross section of the processes $p p →G$, $ϕ$ at leading order (LO) using Madgraph5 [ref] .
MadGraph 5 : Going Beyond · Production rates at the LHC · 1.00
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In addition, in order to improve on resolution, jet masses are filtered [ref] as follows: the constituents of each tagged jet are reclustered with a smaller radius $R_filt=minΔR_sj,sj/2,R_f$, with $R_f=0.3$ and $ΔR_sj,sj$ the angular distance between the two subjets after mass-drop in the boosted case.
Jet substructure as a new Higgs search channel at the LHC · Scale-invariant resonance tagging · 1.00
Uses data or values from 4 papers
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We have used $BRH→bb̅=0.577$ from the Higgs Cross Section Working Group recommendations [ref] .
Handbook of LHC Higgs Cross Sections: 2. Differential Distributions · Model independent exclusion limits · 1.00
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The details depend not just on the detector, but also on the experimental jet reconstruction techniques.] for the detector mass resolution $f_m$ of 15% [ref] .
Searches for Dijet Resonances at Hadron Colliders · Scale-invariant resonance tagging · 0.98
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The details depend not just on the detector, but also on the experimental jet reconstruction techniques.] for the detector mass resolution $f_m$ of 15% [ref] .
ATLAS search for new phenomena in dijet mass and angular distributions using pp collisions at sqrt(s)=7 TeV · Scale-invariant resonance tagging · 0.98
Cites as background 27 papers
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New resonances and contact interactions have been searched for by ATLAS and CMS in final states with two jets [ref] , four jets [ref] , six jets [ref] , eight jets [ref] and up to ten jets for the semi-classical black holes searches [ref] .
Search for three-jet resonances in pp collisions at sqrt(s) = 7 TeV · Introduction · 0.89
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New resonances and contact interactions have been searched for by ATLAS and CMS in final states with two jets [ref] , four jets [ref] , six jets [ref] , eight jets [ref] and up to ten jets for the semi-classical black holes searches [ref] .
Search for microscopic black holes in pp collisions at sqrt(s) = 8 TeV · Introduction · 0.89
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New resonances and contact interactions have been searched for by ATLAS and CMS in final states with two jets [ref] , four jets [ref] , six jets [ref] , eight jets [ref] and up to ten jets for the semi-classical black holes searches [ref] .
Search for narrow resonances using the dijet mass spectrum in pp collisions at sqrt(s) = 8 TeV · Introduction · 0.89
Discussion
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