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Measuring the top energy asymmetry at the LHC: QCD and SMEFT interpretations
High Energy Physics - Phenomenology · Submitted 20 Jan 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We suggest to include the energy asymmetry as an important observable in global searches for new physics in the top sector.
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The paper's own sentences, arranged. 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.
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The abstract, sentence by sentence
The energy asymmetry in top-antitop-jet production is an observable of the top charge asymmetry designed for the LHC. We perform a realistic analysis in the boosted kinematic regime, including effects of the parton shower, hadronization and expected experimental uncertainties. Our predictions at particle level show that the energy asymmetry in the Standard Model can be measured with a significance of $3\sigma$ during Run 3, and with more than $5\sigma$ significance at the HL-LHC. Beyond the Standard Model the energy asymmetry is a sensitive probe of new physics with couplings to top quarks. In the framework of the Standard Model Effective Field Theory, we show that the sensitivity of the energy asymmetry to effective four-quark interactions is higher or comparable to other top observables and resolves blind directions in current LHC fits. We suggest to include the energy asymmetry as an important observable in global searches for new physics in the top sector.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The energy asymmetry in top-antitop-jet production is an observable of the top charge asymmetry designed for the LHC. | background 1.00 | 0.06 | 0.04 | asserted 1.00 |
| s1 | We perform a realistic analysis in the boosted kinematic regime, including effects of the parton shower, hadronization and expected experimental uncertainties. | method 0.96 | 0.93 | 0.03 | asserted 0.98 |
| s2 | Our predictions at particle level show that the energy asymmetry in the Standard Model can be measured with a significance of $3\sigma$ during Run 3, and with more than $5\sigma$ significance at the HL-LHC. | result 1.00 | 0.93 | 0.29 | asserted 1.00 |
| s3 | Beyond the Standard Model the energy asymmetry is a sensitive probe of new physics with couplings to top quarks. | interpretation 0.67 | 0.19 | 0.11 | asserted 1.00 |
| s4 | In the framework of the Standard Model Effective Field Theory, we show that the sensitivity of the energy asymmetry to effective four-quark interactions is higher or comparable to other top observables and resolves blind directions in current LHC fits. | result 0.68 | 0.94 | 0.35 | asserted 1.00 |
| s5 | We suggest to include the energy asymmetry as an important observable in global searches for new physics in the top sector. | future work 1.00 | 0.25 | 0.60 | hedged possibility 0.98 |
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The paper
Original abstract
The energy asymmetry in top-antitop-jet production is an observable of the top charge asymmetry designed for the LHC. We perform a realistic analysis in the boosted kinematic regime, including effects of the parton shower, hadronization and expected experimental uncertainties. Our predictions at particle level show that the energy asymmetry in the Standard Model can be measured with a significance of $3\sigma$ during Run 3, and with more than $5\sigma$ significance at the HL-LHC. Beyond the Standard Model the energy asymmetry is a sensitive probe of new physics with couplings to top quarks. In the framework of the Standard Model Effective Field Theory, we show that the sensitivity of the energy asymmetry to effective four-quark interactions is higher or comparable to other top observables and resolves blind directions in current LHC fits. We suggest to include the energy asymmetry as an important observable in global searches for new physics in the top sector.
Human review
How the literature uses it
6 arXiv papers cite this in 8 sentences
Papers citing it · 7 sentences without a confident label
Cites it as background 1 paper
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A further asymmetry measurement was proposed in Ref. [ref] .
Evidence for the charge asymmetry in $pp \rightarrow t\bar{t}$ production at $\sqrt{s}= 13$ TeV with the ATLAS detector · SMEFT interpretation of the results · 0.89
What it cites · 37 sentences without a confident label
Uses the method or tool of 10 papers
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For our numerical predictions of the cross section and the energy asymmetry at parton level, we use [ref] to perform fixed-order NLO QCD computations of the process $pp →tt̅ j$ at a center-of-mass energy of $√(s)=13$.
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations · LHC predictions at parton level · 1.00
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To simulate the process $pp→$ at particle level, we have generated 300 million events using [ref] at NLO QCD interfaced with [ref] for top-quark decays, including spin correlations and finite-width effects, and [ref] for parton showering and hadronization.
Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations · Event generation · 1.00
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To simulate the process $pp→$ at particle level, we have generated 300 million events using [ref] at NLO QCD interfaced with [ref] for top-quark decays, including spin correlations and finite-width effects, and [ref] for parton showering and hadronization.
An Introduction to PYTHIA 8.2 · Event generation · 1.00
Uses data or values from 2 papers
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To obtain numerical values for the uncertainties, we adopt the selection efficiencies and background estimates from a recent measurement of differential cross sections in inclusive production at the ATLAS experiment [ref] , which has similar particle-level selection criteria to ours.
Measurements of top-quark pair differential and double-differential cross-sections in the $\ell$+jets channel with $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector · Expected uncertainties of an LHC measurement · 1.00
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We thank the authors of Ref. [ref] for providing us with the symmetric and asymmetric contributions to the rapidity asymmetry in the SM.
The top-quark charge asymmetry at the LHC and Tevatron through NNLO QCD and NLO EW · Conclusions and outlook · 0.84
Compares with 1 paper
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These expected bounds are comparable to the marginalised bounds obtained from a global fit of $tt̅$ and single-top observables, as well as $tt̅ W$ and $tt̅ Z$ cross sections [ref] , which involves 22 operators with tops.
O new physics, where art thou? A global search in the top sector · Projected LHC sensitivity to effective operators · 0.99
Cites as background 13 papers
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It was first proposed in Ref. [ref] and later computed to next-to-leading order (NLO) in QCD [ref] .
Observing the Top Energy Asymmetry at the LHC · Introduction · 0.93
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It was first proposed in Ref. [ref] and later computed to next-to-leading order (NLO) in QCD [ref] .
Top-Quark Charge Asymmetry Goes Forward: Two New Observables for Hadron Colliders · Introduction · 0.93
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In the past this process has been investigated mostly in the Standard Model, in the context of jet radiation and the charge asymmetry in QCD [ref] or a precise determination of the top mass [ref] .
NLO QCD corrections to top quark pair production in association with one hard jet at hadron colliders · Introduction · 0.99
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