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Signature of same-sign top pair production mediated by a nonuniversal $Z^\prime$ with QCD next-to-leading accuracy at the LHC
High Energy Physics - Phenomenology · Submitted 2 Aug 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In order to suppress the backgrounds, we further investigate the difference between the production rates of the positively and negatively charged dilepton at the LHC, and find that the same-sign dilepton signal of the new physics could be discovered more easily.
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The abstract, sentence by sentence
We present a detailed study of the same-sign top pair production mediated by a non-universal $Z^\prime$ including production and decay at the Large Hadron Collider (LHC) at the QCD next-to-leading order (NLO) level, using the narrow width approximation and helicity amplitudes method. We find that the QCD NLO corrections can loose the constraint on the model parameters and reduce the dependence of the total cross sections on the factorization scale significantly. We also study the signature and backgrounds of the process at the NLO level. In order to suppress the backgrounds, we further investigate the difference between the production rates of the positively and negatively charged dilepton at the LHC, and find that the same-sign dilepton signal of the new physics could be discovered more easily.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a detailed study of the same-sign top pair production mediated by a non-universal $Z^\prime$ including production and decay at the Large Hadron Collider (LHC) at the QCD next-to-leading order (NLO) level, using the narrow width approximation and helicity amplitudes method. | contribution 0.99 | 0.95 | 0.09 | asserted 0.98 |
| s1 | We find that the QCD NLO corrections can loose the constraint on the model parameters and reduce the dependence of the total cross sections on the factorization scale significantly. | result 0.98 | 0.95 | 0.37 | asserted 1.00 |
| s2 | We also study the signature and backgrounds of the process at the NLO level. | contribution 0.99 | 0.93 | 0.04 | asserted 0.91 |
| s3 | In order to suppress the backgrounds, we further investigate the difference between the production rates of the positively and negatively charged dilepton at the LHC, and find that the same-sign dilepton signal of the new physics could be discovered more easily. | result 0.61 | 0.92 | 0.35 | hedged possibility 0.89 |
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The paper
Original abstract
We present a detailed study of the same-sign top pair production mediated by a non-universal $Z^\prime$ including production and decay at the Large Hadron Collider (LHC) at the QCD next-to-leading order (NLO) level, using the narrow width approximation and helicity amplitudes method. We find that the QCD NLO corrections can loose the constraint on the model parameters and reduce the dependence of the total cross sections on the factorization scale significantly. We also study the signature and backgrounds of the process at the NLO level. In order to suppress the backgrounds, we further investigate the difference between the production rates of the positively and negatively charged dilepton at the LHC, and find that the same-sign dilepton signal of the new physics could be discovered more easily.
Human review
How the literature uses it
What this paper does with the arXiv papers it cites
What it cites · 15 sentences without a confident label
Builds on 6 papers
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The observable defined in Eq. ([ref]) can also be used in other same-sign top pair process, such as those discussed in Refs. [ref] .
Models and Phenomenology of Maximal Flavor Violation · Signature and background · 0.85
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The observable defined in Eq. ([ref]) can also be used in other same-sign top pair process, such as those discussed in Refs. [ref] .
Exploring compressed supersymmetry with same-sign top quarks at the Large Hadron Collider · Signature and background · 0.85
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The observable defined in Eq. ([ref]) can also be used in other same-sign top pair process, such as those discussed in Refs. [ref] .
Same-sign top pair production in an extra-dimension model of flavor at the CERN Large Hadron Collider · Signature and background · 0.85
Uses the method or tool of 2 papers
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The massless spinors are denoted as [ref] [equation] and massive spinors can be written as [equation] where $p^♭$ and $η$ are two massless momenta, which fulfill the following conditions [equation]
QCD corrections to the hadronic production of a heavy quark pair and a W-boson including decay correlations · Narrow width approximation and helicity amplitudes method · 1.00
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So we adopt the anti-$k_t$ jet algorithm [ref] and set $R=0.7$ in our calculation.
The anti-k_t jet clustering algorithm · QCD NLO Results · 1.00
Cites as background 9 papers
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The main background to this signal comes from the $t t̅$ (when the events are selected without b-tagging), $t t̅+Z$ and $t t̅+W$ productions, as discussed in Refs. [ref] .
Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC · Signature and background · 0.88
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The main background to this signal comes from the $t t̅$ (when the events are selected without b-tagging), $t t̅+Z$ and $t t̅+W$ productions, as discussed in Refs. [ref] .
Search for same-sign top-quark pair production at sqrt(s) = 7 TeV and limits on flavour changing neutral currents in the top sector · Signature and background · 0.88
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The main background to this signal comes from the $t t̅$ (when the events are selected without b-tagging), $t t̅+Z$ and $t t̅+W$ productions, as discussed in Refs. [ref] .
Search for new physics in events with same-sign dileptons and b-tagged jets in pp collisions at sqrt(s) = 7 TeV · Signature and background · 0.88
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