High Energy Physics - Phenomenology · arXiv:1309.2316 v2 · submitted 9 Sep 2013
ttbar+Large missing energy from top-quark partners: a comprehensive study at NLO QCD
The paper says
“We find that predictions from leading-order plus parton shower simulations can significantly deviate from NLO QCD or LO merged samples and do not correctly model the kinematics of the ttbar + ETmiss signature.”
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Abstract
We perform a detailed study of top-quark partner production in the ttbar plus large missing energy final-state at the LHC, presenting results for both scalar and fermionic top-quark partners in the semi-leptonic and dileptonic decay modes of the top quarks. We compare the results of several simulation tools: leading-order matrix elements, next-to-leading order matrix elements, leading-order plus parton shower simulations, and merged samples that contain the signal process with an additional hard jet radiated. We find that predictions from leading-order plus parton shower simulations can significantly deviate from NLO QCD or LO merged samples and do not correctly model the kinematics of the ttbar + ETmiss signature. They are therefore not a good framework for modeling this new physics signature. On the other hand, the acceptances obtained with a merged sample of the leading-order process together with the radiation of an additional hard jet are in agreement with the NLO predictions. We also demonstrate that the scale variation of the inclusive cross section, plus that of the acceptance, does not accurately reflect the uncertainty of the cross section after cuts, which is typically larger. We show the importance of including higher-order QCD corrections when using kinematic distributions to determine the spin of the top-quark partner.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 0.99
What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.53 · human participants 0.01 · controlled comparison 0.32 · randomized assignment 0.01 · states quantitative result 0.07 · compares with prior results 0.94 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v2). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| We perform a detailed study of top-quark partner production in the ttbar plus large missing energy final-state at the LHC, presenting results for both scalar and fermionic top-quark partners in the semi-leptonic and dileptonic decay modes of the top quarks. | contribution 1.00 | 0.95 | 0.06 | asserted 0.93 |
| We compare the results of several simulation tools: leading-order matrix elements, next-to-leading order matrix elements, leading-order plus parton shower simulations, and merged samples that contain the signal process with an additional hard jet radiated. | method 0.91 | 0.88 | 0.04 | asserted 0.90 |
| We find that predictions from leading-order plus parton shower simulations can significantly deviate from NLO QCD or LO merged samples and do not correctly model the kinematics of the ttbar + ETmiss signature. | result 0.99 | 0.95 | 0.36 | asserted 0.99 |
| They are therefore not a good framework for modeling this new physics signature. | interpretation 0.99 | 0.53 | 0.22 | asserted 1.00 |
| On the other hand, the acceptances obtained with a merged sample of the leading-order process together with the radiation of an additional hard jet are in agreement with the NLO predictions. | result 1.00 | 0.91 | 0.17 | asserted 0.96 |
| We also demonstrate that the scale variation of the inclusive cross section, plus that of the acceptance, does not accurately reflect the uncertainty of the cross section after cuts, which is typically larger. | result 0.99 | 0.95 | 0.09 | asserted 1.00 |
| We show the importance of including higher-order QCD corrections when using kinematic distributions to determine the spin of the top-quark partner. | result 0.62 | 0.88 | 0.16 | asserted 1.00 |
What kind of paper the classifier reports this is: simulation study 0.99 · evidence from simulation or computation 1.00
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- arXiv listing abstract v2
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- references and citing sentences
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- T body sentences
- C citations
- R cross-paper relations
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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,736 input tokens, $0.0002 reported.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 3 Pith papers
Reviewed papers on Pith that cite this one. The full citation record
- Closing the stop gap hep-ph · Jul 2014
- Off-shell Top Quarks with One Jet at the LHC: A comprehensive analysis at NLO QCD hep-ph · Sep 2016
- Scalar versus fermionic top partner interpretations of $t\bar t + E_T^{\rm miss}$ searches at the LHC hep-ph · Jul 2016
How the literature uses it
9 arXiv papers cite this in 12 sentences
Papers citing it · 6 sentences without a confident label
Compares with it 1 paper
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For comparison, typical predictions of new physics scenarios such as models with the vector, axial-vector, pseudoscalar, and scalar interaction between the top quark and the dark matter particle are also at the same level, see e.g. Refs. [ref] .
Towards constraining Dark Matter at the LHC: Higher order QCD predictions for $t\bar{t}+Z(Z\to \nu_\ell \bar{\nu}_\ell)$ · Integrated cross section and its scale dependence for the fixed scale · 0.95
Cites it as background 5 papers
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Light stops have been widely studied in the recent literature by both the theoretical [ref] and experimental [ref] communities.
Light stop squarks and b-tagging · Introduction · 0.99
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Light stops have been subject to intense recent studies both in the theory [ref] and experimental [ref] communities.
Spot the stop with a b-tag · Introduction · 0.99
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Phenomenological studies systematically including the NLO QCD corrections to the combined production and decays of squark–squark and stop–antistop pairs have been respectively performed in [ref] and [ref] .
Electroweak corrections to squark-antisquark production at the LHC · Introduction · 0.90
What it cites · 20 sentences without a confident label
Builds on 1 paper
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We calculate the NLO QCD corrections to the processes $pp →T T̅ →b b̅ l νj j A_0 A̅_0$ and $pp →T T̅ →b b̅ l l̅ νν̅A_0 A̅_0$ by extending the framework of Ref. [ref] for top-quark pair production.
NLO QCD corrections to top quark pair production and decay at hadron colliders · Calculational framework · 0.98
Uses the method or tool of 6 papers
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We numerically calculate virtual corrections for the production process via $D$-dimensional generalized unitarity methods [ref] .
Full one-loop amplitudes from tree amplitudes · Calculational framework · 1.00
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We subtract the soft singularity in $T →A_0 t g$ with the dipoles of Ref. [ref] which were developed for the decay $t→W b$ retaining a finite $b$-quark mass.
Top-quark processes at NLO in production and decay · Calculational framework · 0.96
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The signal is modeled using leading-order Madgraph [ref] matrix elements attached to a Pythia shower [ref] .
MadGraph/MadEvent v4: The New Web Generation · Introduction · 0.94
Compares with 2 papers
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For fermionic top partners, we compared against the NLO inclusive hadronic cross section of [ref] , and found agreement at the 0.2% level.
-- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR · Checks of the result · 1.00
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We also compared our result for the scalar-top transverse momentum spectrum with the one from Ref. [ref] , and found complete agreement (see Fig. [ref]).
Supersymmetric top and bottom squark production at hadron colliders · Checks of the result · 1.00
Cites as background 6 papers
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Top-quark plus missing energy signatures have been considered numerous times in the theoretical literature [ref] , and have been searched for experimentally [ref] .
Probing natural SUSY from stop pair production at the LHC · Introduction · 0.98
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Top-quark plus missing energy signatures have been considered numerous times in the theoretical literature [ref] , and have been searched for experimentally [ref] .
Search for New Phenomena in ttbar Events with Large Missing Transverse Momentum in Proton-Proton Collisions at sqrt(s) = 7 TeV with the ATLAS Detector · Introduction · 0.98
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Top-quark plus missing energy signatures have been considered numerous times in the theoretical literature [ref] , and have been searched for experimentally [ref] .
New Physics from the Top at the LHC · Introduction · 0.98
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