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Zero and one jet combined NLO analysis of the top quark forward-backward asymmetry
High Energy Physics - Phenomenology · Submitted 12 Jun 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find agreement with experimental data on the transverse momentum dependence of the asymmetry.
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The abstract, sentence by sentence
We present an analysis of the forward-backward asymmetry in the production of top quark pairs at the Tevatron collider. We use novel Monte Carlo methods for merging matrix elements and parton showers to combine NLO QCD predictions for tt and tt+jet production. Theoretical uncertainties are quantified in detail. We find agreement with experimental data on the transverse momentum dependence of the asymmetry.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present an analysis of the forward-backward asymmetry in the production of top quark pairs at the Tevatron collider. | contribution 0.97 | 0.92 | 0.06 | asserted 0.78 |
| s1 | We use novel Monte Carlo methods for merging matrix elements and parton showers to combine NLO QCD predictions for tt and tt+jet production. | method 0.96 | 0.93 | 0.05 | asserted 1.00 |
| s2 | Theoretical uncertainties are quantified in detail. | method 0.73 | 0.88 | 0.05 | asserted 0.97 |
| s3 | We find agreement with experimental data on the transverse momentum dependence of the asymmetry. | result 1.00 | 0.94 | 0.65 | asserted 1.00 |
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The paper
Original abstract
We present an analysis of the forward-backward asymmetry in the production of top quark pairs at the Tevatron collider. We use novel Monte Carlo methods for merging matrix elements and parton showers to combine NLO QCD predictions for tt and tt+jet production. Theoretical uncertainties are quantified in detail. We find agreement with experimental data on the transverse momentum dependence of the asymmetry.
Human review
References
How the literature uses it
32 arXiv papers cite this in 39 sentences
Papers citing it · 17 sentences without a confident label
Builds on it 1 paper
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The original scheme was extended in Ref. [ref] to incorporate heavy-quark mass effects.
NLO and off-shell effects in top quark mass determinations · The different stages of the theoretical description · 0.86
Uses its method or tool 8 papers
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The shown calculations are constructed from calculations for the individual parton multiplicities, matched using the methods of [ref] [The applicability of this method to processes of most general colour structures was demonstrated in [ref] .], according to the algorithm developed in [ref] .
Merging of matrix elements and parton showers at NLO accuracy · Recent results · 0.95
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The + interface was used to generate a code providing a merged simulation of $tt̅$ and $tt̅+$jet production at hadron colliders, which preserves both the NLO accuracy of the fixed-order prediction and the logarithmic accuracy of the parton shower [ref] .
Interfacing GoSam with Monte Carlo Event Generators · Top-antitop forward-backward asymmetry analysis · 0.93
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Instead, in the multi-jet merging approximation, a CKKW scale [ref] has been used, with a scale $μ_$ for the $pp→t t̅$ hard process set equal to [equation] which in practice weights the contributions of the different colour flows involved in the process [ref] .
NNLO versus NLO multi-jet merging for top-pair production including electroweak corrections · Input parameters and scales · 0.99
Compares with it 3 papers
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We have verified in Ref. [ref] the consistency of our inclusive $tt̅$ NNLO calculation with NLO $tt̅ j$ predictions from Refs. [ref] and found perfect agreement with an independent evaluation performed with the package Helac-Nlo [ref] .
NNLO QCD predictions for fully-differential top-quark pair production at the Tevatron · $$ distribution and differential asymmetry · 0.96
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[ref]), is consistent with results for the NLO QCD corrections to $pp →tj$ from Refs. [ref] and agrees perfectly with an independent evaluation using Helac-Nlo [ref] .
Resolving the Tevatron Top Quark Forward-Backward Asymmetry Puzzle: Fully Differential Next-to-Next-to-Leading-Order Calculation · Results · 1.00
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The predicted NNLO $p_T,tt̅$ distribution for nonvanishing transverse momentum is consistent with results for the NLO QCD corrections to $pp →tj$ from Refs. [ref] and agrees with an independent evaluation using Helac-Nlo [ref] .
High-precision differential predictions for top-quark pairs at the LHC · Details of the calculation · 1.00
Cites it as background 9 papers
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It was first predicted by Kuhn and Rodrigo [ref] and has been revisited several times since then [ref] , including beyond NLO analysis [ref] .
Top-quark forward-backward asymmetry from a color-octet t-channel resonance · Observables · 0.95
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Particle-level Monte Carlo generators matching NLO QCD matrix elements to parton showers have been available for quite some time for inclusive production [ref] and since recently for [ref] and $tt̅+2$ jet [ref] production.
Multi-jet merged top-pair production including electroweak corrections · Introduction · 0.94
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Predictions for top-quark pair production in association with up to two jets are available at the next–to–leading order (NLO) [ref] , and NLO calculations for inclusive top-quark pair production and in association with up to one or two jets were matched to parton showers in order to provide predictions at the particle level [ref] .
Next-to-leading order QCD predictions for top-quark pair production with up to three jets · Introduction · 0.87
What it cites · 39 sentences without a confident label
Builds on 1 paper
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In the context of this work, we extended the implementation to massive partons, using kinematics and phase-space factorization in the method of Catani, Seymour, Dittmaier and Trocsanyi (CDST) [ref] .
The Dipole Formalism for Next-to-Leading Order QCD Calculations with Massive Partons · MC@NLO for massive particles · 0.83
Uses the method or tool of 19 papers
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Virtual matrix elements for $tt̅$ and $tt̅$+jet are provided by [ref] .
Automated One-Loop Calculations with GoSam · AFB results · 0.94
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We employ the leading-order matrix element generators [ref] and [ref] in conjunction with the automated dipole subtraction provided in [ref] and the implementation of the Binoth–Les Houches interface [ref] to obtain parton-level events at next-to-leading order.
A proposal for a standard interface between Monte Carlo tools and one-loop programs · AFB results · 1.00
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We employ the leading-order matrix element generators [ref] and [ref] in conjunction with the automated dipole subtraction provided in [ref] and the implementation of the Binoth–Les Houches interface [ref] to obtain parton-level events at next-to-leading order.
0709.28815 · AFB results · 1.00
Compares with 5 papers
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We present results for both the and the methods and compare them to data from the CDF collaboration [ref] , and to a fixed-order calculation for the asymmetry evaluated at scale $ŝ$ using MCFM [ref] .
Top-quark processes at NLO in production and decay · Inclusive asymmetries · 0.99
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We present results for both the and the methods and compare them to data from the CDF collaboration [ref] , and to a fixed-order calculation for the asymmetry evaluated at scale $ŝ$ using MCFM [ref] .
MCFM for the Tevatron and the LHC · Inclusive asymmetries · 0.99
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We present results for both the and the methods and compare them to data from the CDF collaboration [ref] , and to a fixed-order calculation for the asymmetry evaluated at scale $ŝ$ using MCFM [ref] .
Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties · Inclusive asymmetries · 0.99
Cites as support 1 paper
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This was shown in a detailed numerical analysis in [ref] .
QCD Coherence and the Top Quark Asymmetry · IF/FI dipole splitting kinematics and their implications on AFB · 0.96
Cites as background 3 papers
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Much attention has also been paid to the calculation of the EW contributions to the asymmetry from pure EW interactions and the interplay between EW and QCD processes [ref] .
1107.26060 · Introduction · 0.89
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Soft-gluon resummation was also performed in this context [ref] .
0907.14436 · Introduction · 0.96
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There is also hope that measurements at the LHC may bring some more insight, although the current situation still suffers from a lack of analyzed data [ref] .
1112.51002 · Conclusions · 0.84
Discussion
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