Standard Model Top Quark Asymmetry at the Fermilab Tevatron

D. Rainwater; M.T. Bowen; S.D. Ellis

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Standard Model Top Quark Asymmetry at the Fermilab Tevatron

M.T. Bowen, S.D. Ellis, D. Rainwater

High Energy Physics - Phenomenology · Submitted 23 Sep 2005

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We conclude that the measurement of this asymmetry at the Tevatron will be challenging, but important both for our understanding of QCD and for our efforts to model it.

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What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.80 · human participants 0.01 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.04 · compares with prior results 0.23 · mentions code or data availability 0.02.

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Top quark pair production at proton-antiproton colliders is known to exhibit a forward-backward asymmetry due to higher-order QCD effects. We explore how this asymmetry might be studied at the Fermilab Tevatron, including how the asymmetry depends on the kinematics of extra hard partons. We consider results for top quark pair events with one and two additional hard jets. We further note that a similar asymmetry, correlated with the presence of jets, arises in specific models for parton showers in Monte Carlo simulations. We conclude that the measurement of this asymmetry at the Tevatron will be challenging, but important both for our understanding of QCD and for our efforts to model it.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Top quark pair production at proton-antiproton colliders is known to exhibit a forward-backward asymmetry due to higher-order QCD effects.	background 1.00	0.04	0.03	asserted 1.00
s1	We explore how this asymmetry might be studied at the Fermilab Tevatron, including how the asymmetry depends on the kinematics of extra hard partons.	contribution 0.99	0.39	0.04	speculative 0.77
s2	We consider results for top quark pair events with one and two additional hard jets.	contribution 0.79	0.65	0.02	asserted 0.84
s3	We further note that a similar asymmetry, correlated with the presence of jets, arises in specific models for parton showers in Monte Carlo simulations.	background 0.41	0.15	0.02	asserted 0.90
s4	We conclude that the measurement of this asymmetry at the Tevatron will be challenging, but important both for our understanding of QCD and for our efforts to model it.	interpretation 0.79	0.26	0.93	asserted 0.87

What kind of paper the classifier reports this is: position or commentary 0.38 · evidence from argument 0.55.

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full text
figures and tables
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T body sentences
C citations
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The paper

Original abstract

Top quark pair production at proton-antiproton colliders is known to exhibit a forward-backward asymmetry due to higher-order QCD effects. We explore how this asymmetry might be studied at the Fermilab Tevatron, including how the asymmetry depends on the kinematics of extra hard partons. We consider results for top quark pair events with one and two additional hard jets. We further note that a similar asymmetry, correlated with the presence of jets, arises in specific models for parton showers in Monte Carlo simulations. We conclude that the measurement of this asymmetry at the Tevatron will be challenging, but important both for our understanding of QCD and for our efforts to model it.

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References

Forward citations

Cited by 10 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

NLO QCD corrections to t tbar + jet production at hadron colliders
hep-ph 2007-03 accept novelty 7.0 of 10

Next-to-leading-order QCD corrections to top-antitop plus jet production are computed for the first time, reducing the scale uncertainty on the rate and cutting the predicted forward-backward top asymmetry from about ...
Axigluons cannot explain the observed top quark forward-backward asymmetry
hep-ph 2010-07 conditional novelty 6.0 of 10

Flavor-changing B_d mixing and related constraints exclude the axigluon parameter region that best fits the Tevatron top forward-backward asymmetry, leaving too small an effect.
Top quark forward-backward asymmetry from new t-channel physics
hep-ph 2009-07 conditional novelty 6.0 of 10

A 160 GeV Z' with flavor-changing up-top couplings can generate an 18% top forward-backward asymmetry at the Tevatron without conflicting with cross-section, like-sign top, or flavor measurements.
Top quark and leptonic charge asymmetries for the Tevatron and LHC
hep-ph 2012-05 accept novelty 5.0 of 10

Standard Model predictions at NLO QCD plus electroweak order are given for top-quark and leptonic charge asymmetries at the Tevatron and LHC, including new LHC dilepton asymmetries.
A Polarized View of the Top Asymmetry
hep-ph 2011-05 conditional novelty 5.0 of 10

Lepton charge asymmetries, top polarization, and spin correlations can establish a new-physics origin for the top forward-backward asymmetry and separate competing models at roughly three sigma with 5 inverse femtobar...

Show 5 more citing papers

On Models of New Physics for the Tevatron Top A_FB
hep-ph 2011-03 conditional novelty 5.0 of 10

Model-dependent event-selection efficiencies, not just parton-level spectra, decide whether W-prime and Z-prime models survive the Tevatron top asymmetry and invariant-mass constraints.
Effective-Field-Theory Approach to Top-Quark Production and Decay
hep-ph 2010-08 accept novelty 5.0 of 10

Fifteen dimension-six operators capture all leading new-physics corrections to top-quark decay and production, with explicit Standard-Model interference formulas for each collider observable.
Distributions and correlations for top quark pair production and decay at the Tevatron and LHC.
hep-ph 2010-03 accept novelty 5.0 of 10

A next-to-leading-order QCD plus weak calculation of top-pair charge asymmetries and spin correlations at the Tevatron and LHC, with selection cuts, agrees with Tevatron measurements and supplies Standard Model benchm...
Charge asymmetries of top quarks at hadron colliders revisited
hep-ph 2011-09 conditional novelty 4.0 of 10

Including QED and weak corrections raises the Standard Model top charge asymmetry by about 20%, and a 20 GeV cut on the top pair transverse momentum raises it by another 30 to 50%.
Top quark physics at the LHC
hep-ph 2008-05 accept novelty 1.0 of 10

A 2008 review of what the LHC was expected to teach about top quarks: their decay, pair production, single production, spin effects, and possible new physics.

How the literature uses it

30 arXiv papers cite this in 43 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 · 28 sentences without a confident label

Uses its data or values 3 papers

The most recent updated data from CDF and D0 are [ref] [equation] in the $tt̅$ rest frame, whereas the SM prediction [ref] based on MCFM is $0.058 ±0.009$ [ref] .

Chiral U(1) flavor models and flavored Higgs doublets: the top FB asymmetry and the Wjj · Introduction · 1.00
The unexpectedly large forward-backward asymmetry in the production of pairs at the Tevatron as observed by CDF $A^= 0.193 ±0.069$ [ref] and DØ $A^ = 0.24 ±0.14$ [ref] in 2008 generated a lot of interest, because it is significantly higher than the Standard Model (SM) prediction, $A^ (SM) ≈0.06$ [ref] .

Explaining the t tbar forward-backward asymmetry without dijet or flavor anomalies · Introduction · 0.94
QCD predicts that the size of the inclusive charge asymmetry is 5 to 8% [ref] , with top quarks (antitop quarks) more abundant in the direction of the incoming proton (antiproton).

Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders · Introduction · 0.92

Compares with it 2 papers

The sole purpose of this section is to compare the results of our computational setup with previous SM computations of these asymmetries [ref] , and also with recent experimental results [ref] .

Top quark and leptonic charge asymmetries for the Tevatron and LHC · Tevatron · 1.00
Interestingly, these results are consistent with the explicit NLO results presented in Refs. [ref] , which indicate a decrease in the charge asymmetry, and even a reversal of its sign, for top pair plus jet cross sections.

Threshold Resummation for the Top Quark Charge Asymmetry · Phenomenological Results · 0.93

Cites it as background 10 papers

One especially interesting variable is the leptonic charge asymmetry [ref]

A Polarized View of the Top Asymmetry · Tevatron Analysis · 0.83
However, despite the good agreement between the SM and data in the top-quark sector, the 3$σ$ excess in the $tt̅$ charge or forward-backward (FB) asymmetry with respect to the SM predictions [ref] , observed at Tevatron by the CDF [ref] and D0 [ref] Collaborations, still needs to be clarified.

Implications of effective axial-vector coupling of gluon for $t\bar{t}$ spin polarizations at the LHC · Introduction · 0.86
In QCD, the charge asymmetry in $tt̅$ production first occurs at next-to-leading order (NLO) [ref] ; in $tt̅ j$ production it is induced at tree level due to the presence of the additional jet [ref] .

Measurement of the energy asymmetry in $t\bar{t}j$ production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework · Introduction · 0.80

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