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Phenomenology of a light gluon resonance in top-physics at Tevatron and LHC
High Energy Physics - Phenomenology · Submitted 7 Jul 2011
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In contrast to most of the previous works, this analysis shows that for masses below ~1 TeV resonant New Physics could accommodate the experimental data.
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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
We present a phenomenological analysis of the recent Tevatron results on the $t \bar t$ forward-backward asymmetry and invariant-mass spectrum assuming a new contribution from an s-channel gluon resonance with a mass in the range from 700 to 2500 GeV. In contrast to most of the previous works, this analysis shows that for masses below ~1 TeV resonant New Physics could accommodate the experimental data. In general, we find that axial-like couplings are preferred for light and top quark couplings, and that only top quark couples strongly to New Physics. We find that composite model scenarios arise naturally from only phenomenological analyses of the experimental results. We show that our results are compatible with recent LHC limits in dijet and $t \bar t$ production, and find some tension for large resonance mass ~2.5 TeV. We indicate as best observables for discriminating a relatively light new gluon a better resolution in CDF forward-backward asymmetry, as well as the $t \bar t$ charge asymmetry and invariant-mass spectrum at the LHC.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a phenomenological analysis of the recent Tevatron results on the $t \bar t$ forward-backward asymmetry and invariant-mass spectrum assuming a new contribution from an s-channel gluon resonance with a mass in the range from 700 to 2500 GeV. | contribution 1.00 | 0.91 | 0.08 | asserted 0.93 |
| s1 | In contrast to most of the previous works, this analysis shows that for masses below ~1 TeV resonant New Physics could accommodate the experimental data. | result 0.96 | 0.92 | 0.46 | hedged possibility 0.86 |
| s2 | In general, we find that axial-like couplings are preferred for light and top quark couplings, and that only top quark couples strongly to New Physics. | result 0.97 | 0.94 | 0.21 | asserted 1.00 |
| s3 | We find that composite model scenarios arise naturally from only phenomenological analyses of the experimental results. | interpretation 0.74 | 0.87 | 0.14 | asserted 0.99 |
| s4 | We show that our results are compatible with recent LHC limits in dijet and $t \bar t$ production, and find some tension for large resonance mass ~2.5 TeV. | result 0.95 | 0.95 | 0.11 | asserted 0.96 |
| s5 | We indicate as best observables for discriminating a relatively light new gluon a better resolution in CDF forward-backward asymmetry, as well as the $t \bar t$ charge asymmetry and invariant-mass spectrum at the LHC. | future work 0.73 | 0.86 | 0.14 | hedged possibility 0.95 |
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The paper
Original abstract
We present a phenomenological analysis of the recent Tevatron results on the $t \bar t$ forward-backward asymmetry and invariant-mass spectrum assuming a new contribution from an s-channel gluon resonance with a mass in the range from 700 to 2500 GeV. In contrast to most of the previous works, this analysis shows that for masses below ~1 TeV resonant New Physics could accommodate the experimental data. In general, we find that axial-like couplings are preferred for light and top quark couplings, and that only top quark couples strongly to New Physics. We find that composite model scenarios arise naturally from only phenomenological analyses of the experimental results. We show that our results are compatible with recent LHC limits in dijet and $t \bar t$ production, and find some tension for large resonance mass ~2.5 TeV. We indicate as best observables for discriminating a relatively light new gluon a better resolution in CDF forward-backward asymmetry, as well as the $t \bar t$ charge asymmetry and invariant-mass spectrum at the LHC.
Human review
How the literature uses it
22 arXiv papers cite this in 24 sentences
Papers citing it · 18 sentences without a confident label
Cites it as background 6 papers
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Axigluons have a long history [ref] and there has been a significant amount of work to explain the $tt̅$ FBA via massive color octets [ref] .
Light Axigluon Contributions to b-bbar and c-cbar Asymmetry and Constraints on Flavor Changing Axigluon Currents · Introduction · 0.98
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However, from a phenomenological point of view, these models mainly fall into only two categories according to the nature of the new particle exchange: (i) $s$-channel exchange of vector mediators (e.g. axigluon models) [ref] or (ii) $t$-channel exchange of flavor-violating mediators [ref] [There is another class of models that can create effective axial QCD coupling from NP [ref] . ].
Tevatron Top $A_{FB}$ Versus LHC Top Physics · Introduction · 0.85
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Most of these produce the asymmetry through the exchange of a new particle, either an $s$-channel mediator with axial couplings to both top and light quarks [ref] , or a $t$-channel (or $u$-channel) mediator [ref] with flavor-violating couplings that convert a light quark or antiquark to a top quark.
Diagnosing the top-quark angular asymmetry using LHC intrinsic charge asymmetries · Introduction · 0.96
What it cites · 23 sentences without a confident label
Builds on 5 papers
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In Refs. [ref] we have shown how, by properly choosing the quantum numbers of the fermions under the custodial symmetry and an extra discrete symmetry (called $P_LR$ and $P_C$), one can protect the $Z$-couplings of the light fermions and reproduce the measured $A_FB^b$.[See also Refs. [ref] for other solutions.] The same mechanism can be implemented in the present set-up for $M≳2$ TeV.
The precision electroweak data in warped extra-dimension models · Discussion and UV completions · 0.93
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In Refs. [ref] we have shown how, by properly choosing the quantum numbers of the fermions under the custodial symmetry and an extra discrete symmetry (called $P_LR$ and $P_C$), one can protect the $Z$-couplings of the light fermions and reproduce the measured $A_FB^b$.[See also Refs. [ref] for other solutions.] The same mechanism can be implemented in the present set-up for $M≳2$ TeV.
Solving the A{FB}^b anomaly in natural composite models · Discussion and UV completions · 0.93
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In Refs. [ref] we have shown how, by properly choosing the quantum numbers of the fermions under the custodial symmetry and an extra discrete symmetry (called $P_LR$ and $P_C$), one can protect the $Z$-couplings of the light fermions and reproduce the measured $A_FB^b$.[See also Refs. [ref] for other solutions.] The same mechanism can be implemented in the present set-up for $M≳2$ TeV.
A composite Higgs model analysis of forward-backward asymmetries in the production of tops at Tevatron and bottoms at LEP and SLC · Discussion and UV completions · 0.93
Uses the method or tool of 3 papers
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In this numerical scan we use Madgraph/Madevent [ref] (MGME) [We have slightly modified MGME to include a running width for the resonance.] with CTEQ6L parton distribution functions [ref] to simulate Tevatron $pp̅ →tt̅$ process and compute $A_FB^t$ and at parton-level.
MadGraph/MadEvent v4: The New Web Generation · Numerical scan and results · 1.00
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In this numerical scan we use Madgraph/Madevent [ref] (MGME) [We have slightly modified MGME to include a running width for the resonance.] with CTEQ6L parton distribution functions [ref] to simulate Tevatron $pp̅ →tt̅$ process and compute $A_FB^t$ and at parton-level.
New Generation of Parton Distributions with Uncertainties from Global QCD Analysis · Numerical scan and results · 1.00
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We have simulated at LO the dijet production in our model with MGME and Pythia [ref] for hadronization and showering simulations.
PYTHIA 6.4 Physics and Manual · LHC phenomenology · 1.00
Uses data or values from 3 papers
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In particular, motivated by the not-unfolded data on $A^t_FB$ (see Fig. 10 in Ref. [ref] ), we pursue to reproduce the peak around 650 GeV as a resonant effect arising from a $G^*$ with $M ≳700$ GeV and, at the same time, to produce small corrections to the invariant mass distribution in the cross section.
Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production · Analytic study of the $qq̅ →tt̅$ process · 0.88
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As a matter of fact, CDF and D0 have published several articles [ref] in the last few years on $tt̅$ pair-production, where in CDF results the forward-backward asymmetry ($A_FB^t$) measurement did not agree with the SM NLO (next-to-leading order) expectation, whereas the cross section ($σ_tt̅$) and its invariant-mass ($M_tt̅$) spectrum did agree with the SM NLO expectation.
Forward-Backward Asymmetry in Top Quark Production in ppbar Collisions at sqrt{s}=1.96 TeV · Introduction · 0.81
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As a matter of fact, CDF and D0 have published several articles [ref] in the last few years on $tt̅$ pair-production, where in CDF results the forward-backward asymmetry ($A_FB^t$) measurement did not agree with the SM NLO (next-to-leading order) expectation, whereas the cross section ($σ_tt̅$) and its invariant-mass ($M_tt̅$) spectrum did agree with the SM NLO expectation.
First measurement of the forward-backward charge asymmetry in top quark pair production · Introduction · 0.81
Compares with 2 papers
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In order to test the different points in the parameter space, we compare our simulated $A_FB^t$ results to the CDF two-bins unfolded result on this observable [ref] .
Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production · Numerical scan and results · 0.98
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Although there is a correlation with $A_FB^t$, it is different from the one reported for the axial model in [ref] , essentially because the couplings are neither axial, nor universal, resulting in a more complicated pattern that is difficult to disentangle from the signals of other models by just analyzing these observables: $A_FB^t$ and $A_C$.
Asymmetries in t tbar production: LHC versus Tevatron · LHC phenomenology · 0.99
Cites as support 1 paper
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The motivation for this choice in the top quarks is simplicity and the existence of precision measurements in $B$-physics [ref] which constrain the couplings of the $(t_L b_L)$ doublet to new gluons.
A Flavor Protection for Warped Higgsless Models · Numerical scan and results · 0.98
Cites as background 6 papers
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Previous works [ref] have proposed new particles in $t$- and $s$-channel, and non-resonant NP as effective operators to solve this anomaly.
Effective axial-vector coupling of gluon as an explanation to the top quark asymmetry · Introduction · 0.93
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These results have raised the attention of the theoretical community which has essayed their hypothesis in several and varied publications [ref] .
New Strongly Coupled Sector at the Tevatron and the LHC · Introduction · 0.92
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For a more complete description of a large class of effective theories containing a gluon resonance as well as electroweak (EW) and fermionic resonances, look Ref. [ref] and Refs. [ref] .
A composite Higgs model analysis of forward-backward asymmetries in the production of tops at Tevatron and bottoms at LEP and SLC · Effective model · 0.97
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