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Tracking Down the Top Quark Forward-Backward Asymmetry with Monotops
High Energy Physics - Phenomenology · Submitted 16 Aug 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim After performing a global fit to top data from both the Tevatron and the LHC, we obtain a viable region of parameter space consistent with all phenomenological and collider constraints.
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The abstract, sentence by sentence
We revisit the possibility that the top quark forward-backward asymmetry arises from the on-shell production and decay of scalar top partners to top-antitop pairs with missing transverse energy. Although the asymmetry is produced by t-channel exchange of a light mediator, the model remains unconstrained by low energy atomic parity violation tests. An interesting connection to the active neutrino sector through a Type-I seesaw operator helps to evade stringent monojet constraints and opens up a richer collider phenomenology. After performing a global fit to top data from both the Tevatron and the LHC, we obtain a viable region of parameter space consistent with all phenomenological and collider constraints. We also discuss the discovery potential of a predicted monotop signal and related lepton charge asymmetry at the LHC.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We revisit the possibility that the top quark forward-backward asymmetry arises from the on-shell production and decay of scalar top partners to top-antitop pairs with missing transverse energy. | contribution 0.90 | 0.37 | 0.14 | hedged possibility 0.93 |
| s1 | Although the asymmetry is produced by t-channel exchange of a light mediator, the model remains unconstrained by low energy atomic parity violation tests. | interpretation 0.41 | 0.21 | 0.06 | asserted 1.00 |
| s2 | An interesting connection to the active neutrino sector through a Type-I seesaw operator helps to evade stringent monojet constraints and opens up a richer collider phenomenology. | contribution 0.52 | 0.28 | 0.06 | asserted 0.83 |
| s3 | After performing a global fit to top data from both the Tevatron and the LHC, we obtain a viable region of parameter space consistent with all phenomenological and collider constraints. | result 0.97 | 0.96 | 0.65 | asserted 0.93 |
| s4 | We also discuss the discovery potential of a predicted monotop signal and related lepton charge asymmetry at the LHC. | contribution 0.77 | 0.62 | 0.09 | asserted 0.46 |
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The paper
Original abstract
We revisit the possibility that the top quark forward-backward asymmetry arises from the on-shell production and decay of scalar top partners to top-antitop pairs with missing transverse energy. Although the asymmetry is produced by t-channel exchange of a light mediator, the model remains unconstrained by low energy atomic parity violation tests. An interesting connection to the active neutrino sector through a Type-I seesaw operator helps to evade stringent monojet constraints and opens up a richer collider phenomenology. After performing a global fit to top data from both the Tevatron and the LHC, we obtain a viable region of parameter space consistent with all phenomenological and collider constraints. We also discuss the discovery potential of a predicted monotop signal and related lepton charge asymmetry at the LHC.
Human review
How the literature uses it
9 arXiv papers cite this in 15 sentences
Papers citing it · 8 sentences without a confident label
Compares with it 1 paper
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Although this bound is weaker than the one obtained from FCNC top decays [ref] , the monotop signature (especially if the leptonic and hadronic [ref] signatures were combined) nonetheless appears to be interesting also for studying FCNC $utZ$ interactions.
Leptonic Monotops at LHC · $Z$ mediated $ΔT=1$ FCNCs · 0.97
Cites it as background 5 papers
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We note that in the past the top–up flavour-changing coupling has been extensively studied [ref] , while the top–charm coupling has received less attention.
Signatures of top flavour-changing dark matter · Introduction · 0.90
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As examples, one finds supersymmetric models with $R$-parity violation in which a singly-produced top squark decays into a top quark and a long-lived neutralino giving rise to missing transverse energy [ref] , models with an extended gauge symmetry featuring leptoquarks than can decay into a particle pair constituted of a top quark and a neutrino [ref] or hylogenesis scenarios for dark matter where the top quark is produced together with several dark matter candidates carrying missing momentum [ref] .
Monotop phenomenology at the Large Hadron Collider · Introduction · 0.86
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Another model implements a coloured electroweak-singlet scalar and three Majorana fermions, uncharged under the SM gauge symmetry, to address the non-zero forward-backward top asymmetry through on shell production of the coloured scalar [ref] .
Probing Radiative Neutrino Mass Generation through Monotop Production · Introduction · 0.85
What it cites · 19 sentences without a confident label
Uses the method or tool of 2 papers
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To calculate the asymmetry, we simulate the NP process $pp →ξξ^* →tt̅χ_tχ_t$ at $√(s)= 1.96$ & $7$ TeV at the Tevatron and LHC respectively, using MadGraph5v1.5.10 [ref] and the CTEQ6L1 pdf set [ref] .
MadGraph 5 : Going Beyond · Global Fit to Top Data from Tevatron and LHC · 1.00
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We simulate all NP signals at the LHC for $√(s)=7$ using MadGraph5v1.5.10 [ref] interfaced with PYTHIA [ref] to account for parton shower and hadronization effects.
A Brief Introduction to PYTHIA 8.1 · LHC Collider Signatures · 1.00
Uses data or values from 14 papers
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- CDF and D$Ø$ combination of inclusive cross section measurements, $σ_t t̅ = 7.65 ±0.41$ (stat+syst) pb [ref] , along with the NNLO+NNLL SM calculation, $σ_t t̅ = 7.067^+0.143_-0.232$(scale)$^+0.186_-0.122$(pdf) pb [ref] . - Inclusive forward-backward asymmetry measurements from both CDF, $A_FB^t t̅= 0.164 ±0.047$ (stat+syst) [ref] , and D$Ø$, $A_FB^t t̅= 0.196 ±0.065$ (stat+syst) [ref] , along with the theoretical NLO SM calculation, $A_FB^t t̅ = 0.088 ±0.006$ (scale+pdf) [ref] . - Differential cross section measurements from CDF [ref] along with the theoretical NNLO SM calculation [ref] . - Differential forward-backward asymmetry measurements from CDF [ref] along with the theoretical NNLO SM calculation which we take from [ref] . - Inclusive cross section measurements from ATLAS, $σ_t t̅ = 165 ±17$ (stat+syst) pb [ref] , and CMS, $σ_t t̅ = 161.9 ±6.6$ (stat+syst) [ref] , along with th
Measurement of the charge asymmetry in top-quark pair production in proton-proton collisions at sqrt(s) = 7 TeV · Global Fit to Top Data from Tevatron and LHC · 0.99
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- CDF and D$Ø$ combination of inclusive cross section measurements, $σ_t t̅ = 7.65 ±0.41$ (stat+syst) pb [ref] , along with the NNLO+NNLL SM calculation, $σ_t t̅ = 7.067^+0.143_-0.232$(scale)$^+0.186_-0.122$(pdf) pb [ref] . - Inclusive forward-backward asymmetry measurements from both CDF, $A_FB^t t̅= 0.164 ±0.047$ (stat+syst) [ref] , and D$Ø$, $A_FB^t t̅= 0.196 ±0.065$ (stat+syst) [ref] , along with the theoretical NLO SM calculation, $A_FB^t t̅ = 0.088 ±0.006$ (scale+pdf) [ref] . - Differential cross section measurements from CDF [ref] along with the theoretical NNLO SM calculation [ref] . - Differential forward-backward asymmetry measurements from CDF [ref] along with the theoretical NNLO SM calculation which we take from [ref] . - Inclusive cross section measurements from ATLAS, $σ_t t̅ = 165 ±17$ (stat+syst) pb [ref] , and CMS, $σ_t t̅ = 161.9 ±6.6$ (stat+syst) [ref] , along with th
First Measurement of the $\lowercase{\ttbar}$ Differential Cross Section $\lowercase{d\sigma/d}M_{\lowercase{{t\overline{t}}}}$ in $\lowercase{\ppbar}$ Collisions at $\sqrt{\lowercase{s}}=1.96$ TeV · Global Fit to Top Data from Tevatron and LHC · 0.99
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- CDF and D$Ø$ combination of inclusive cross section measurements, $σ_t t̅ = 7.65 ±0.41$ (stat+syst) pb [ref] , along with the NNLO+NNLL SM calculation, $σ_t t̅ = 7.067^+0.143_-0.232$(scale)$^+0.186_-0.122$(pdf) pb [ref] . - Inclusive forward-backward asymmetry measurements from both CDF, $A_FB^t t̅= 0.164 ±0.047$ (stat+syst) [ref] , and D$Ø$, $A_FB^t t̅= 0.196 ±0.065$ (stat+syst) [ref] , along with the theoretical NLO SM calculation, $A_FB^t t̅ = 0.088 ±0.006$ (scale+pdf) [ref] . - Differential cross section measurements from CDF [ref] along with the theoretical NNLO SM calculation [ref] . - Differential forward-backward asymmetry measurements from CDF [ref] along with the theoretical NNLO SM calculation which we take from [ref] . - Inclusive cross section measurements from ATLAS, $σ_t t̅ = 165 ±17$ (stat+syst) pb [ref] , and CMS, $σ_t t̅ = 161.9 ±6.6$ (stat+syst) [ref] , along with th
Renormalization-Group Improved Predictions for Top-Quark Pair Production at Hadron Colliders · Global Fit to Top Data from Tevatron and LHC · 0.99
Compares with 1 paper
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The CMS collaboration has also performed a search for same-sign top quark production [ref] , however, their model-independent limit on the production cross section, 17 pb, is weaker than the above ATLAS bound.
Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector · Same-sign top quark production · 0.91
Cites as support 1 paper
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Several models explaining the top quark forward-backward asymmetry with light $t$-channel mediators connecting $u$ and $t$ quarks are strongly disfavoured by APV constraints [ref] .
Confronting Top AFB with Parity Violation Constraints · Atomic parity violation · 0.97
Cites as background 5 papers
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[ref] , a single, light, stable Majorana fermion is introduced and considered as a potential dark matter candidate.
Forward-Backward t tbar Asymmetry from Anomalous Stop Pair Production · Introduction · 0.80
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In many NP models, the signal is typically produced by a heavy resonance (much heavier than $m_t$) that decays on-shell to $t +$, generally focusing the $$ distribution in the $>$100 GeV region [ref] .
Monotops at the LHC · Monotop production · 0.83
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In many NP models, the signal is typically produced by a heavy resonance (much heavier than $m_t$) that decays on-shell to $t +$, generally focusing the $$ distribution in the $>$100 GeV region [ref] .
Search for the signal of monotop production at the early LHC · Monotop production · 0.83
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