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Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
High Energy Physics - Phenomenology · Submitted 10 Jan 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find that a large class of new physics models that have been proposed to account for the $A^t_{FB}$ lead to SST quark production rate much larger than the observed rate at the LHC and consequently are severely constrained or ruled out.
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The abstract, sentence by sentence
We study the connection between the same sign top (SST) and the top quark forward-backward asymmetry $A^t_{FB}$. We find that a large class of new physics models that have been proposed to account for the $A^t_{FB}$ lead to SST quark production rate much larger than the observed rate at the LHC and consequently are severely constrained or ruled out. Our model independent, general, operator analysis shows that none of the tree-level flavor-changing operators are able to explain $A^t_{FB}$ and simultaneously remain consistent with the same-sign top-quark production constraints from the LHC data.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We study the connection between the same sign top (SST) and the top quark forward-backward asymmetry $A^t_{FB}$. | contribution 0.87 | 0.79 | 0.03 | asserted 0.51 |
| s1 | We find that a large class of new physics models that have been proposed to account for the $A^t_{FB}$ lead to SST quark production rate much larger than the observed rate at the LHC and consequently are severely constrained or ruled out. | result 0.98 | 0.92 | 0.77 | asserted 1.00 |
| s2 | Our model independent, general, operator analysis shows that none of the tree-level flavor-changing operators are able to explain $A^t_{FB}$ and simultaneously remain consistent with the same-sign top-quark production constraints from the LHC data. | result 0.95 | 0.91 | 0.54 | asserted 1.00 |
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The paper
Original abstract
We study the connection between the same sign top (SST) and the top quark forward-backward asymmetry $A^t_{FB}$. We find that a large class of new physics models that have been proposed to account for the $A^t_{FB}$ lead to SST quark production rate much larger than the observed rate at the LHC and consequently are severely constrained or ruled out. Our model independent, general, operator analysis shows that none of the tree-level flavor-changing operators are able to explain $A^t_{FB}$ and simultaneously remain consistent with the same-sign top-quark production constraints from the LHC data.
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References
How the literature uses it
9 arXiv papers cite this in 11 sentences
Papers whose main result relates to this one's
States a conflicting result 1 paper
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We find that under the current experimental constraints both models can alleviate the deviation of $A^t_{FB}$ and, meanwhile, enhance the like-sign top pair production to the detectable level of the LHC.
Papers citing it · 6 sentences without a confident label
Cites it as support 3 papers
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Despite the small cross section of the signal channels due to the presence of two anomalous vertices for t$t$ production, this final state has been shown to have very little SM background and is sensitive to new-physics effects [ref] .
Search for top quark flavour changing neutral currents in same-sign top quark production · Introduction · 0.98
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As discussed in Refs. [ref] and in [ref] this process has very little SM background and hence can be useful in constraining the couplings $ξ_tc$ and $ξ_tu$.
Constraining the flavor changing Higgs couplings to the top-quark at the LHC · Production Processes at the LHC · 0.98
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Interestingly, the direct search for new physics at the LHC can reach the parameter region that is favored by the excesses in the flavor physics [ref] .
Status of the semileptonic $B$ decays and muon g-2 in general 2HDMs with right-handed neutrinos · Summary · 0.96
Cites it as background 2 papers
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Many works have been done through $t→Hq$ rare decays [ref] , the single top quark production with Higgs boson [ref] , and same sign top quark production [ref] .
Study of the $tH$ production at 14TeV and 100TeV $pp$ colliders · Introduction · 0.97
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Same sign tops have been studied in new physics models attempting to explain the forward backward asymmetry [ref] , or in composite models [ref] .
Signs of Tops from Highly Mixed Stops · Introduction · 0.96
What it cites · 13 sentences without a confident label
Uses the method or tool of 1 paper
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This is known as Double-parton scattering (DPS) and its cross-section can be roughly estimated by [ref] ,
Same-sign W pair production as a probe of double parton scattering at the LHC · SM background · 0.80
Uses data or values from 3 papers
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Finally we enforce that the same-sign leptons (which arise due to the leptonic decays of the produced pair of same-sign tops) cross-section also remains within the LHC non-observation limits [ref] for the current data on such events.
Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector · Numerical Analysis and Results · 0.85
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As reported in Ref. [ref] , the independent measurements in the $l + j$, where $l = e^±, μ^±$ and $j$ is a jet, detection mode by the two experiments at the Fermilab Tevatron suggest $A^t_FB$ to be $A^t_FB ( DØ) = 0.19 ±0.065$, and, $A^t_FB ( CDF) = 0.158 ±0.074$ which are clearly consistent with each other within experimental errors yielding a weighted average of $0.176±0.05$.
Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production · The General New Physics Operators · 1.00
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As reported in Ref. [ref] , the independent measurements in the $l + j$, where $l = e^±, μ^±$ and $j$ is a jet, detection mode by the two experiments at the Fermilab Tevatron suggest $A^t_FB$ to be $A^t_FB ( DØ) = 0.19 ±0.065$, and, $A^t_FB ( CDF) = 0.158 ±0.074$ which are clearly consistent with each other within experimental errors yielding a weighted average of $0.176±0.05$.
Forward-backward asymmetry in top quark-antiquark production · The General New Physics Operators · 1.00
Cites as background 2 papers
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Over the years, several speculations [ref] have been made to explain the observed value of $A^t_FB$.
Top production at the Tevatron/LHC and nonstandard, strongly interacting spin one particles · Introduction · 0.97
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Over the years, several speculations [ref] have been made to explain the observed value of $A^t_FB$.
Model independent analysis of the forward-backward asymmetry of top quark production at the Tevatron · Introduction · 0.97
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