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Limits on the Production of Narrow t-tbar Resonances in p-pbar Collisions at sqrt(s)=1.96 TeV
High Energy Physics - Experiment · Submitted 29 Oct 2007
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim A topcolor leptophobic Z' is ruled out below 720 GeV/c2, and the cross section of any narrow Z'-like state decaying to t-tbar is found to be less than 0.64 pb at 95% C.L. for M(Z') above 700 GeV/c2.
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The abstract, sentence by sentence
We search for evidence of resonant top quark pair production in 955 pb-1 of p-pbar collisions at sqrt(s)=1.96 TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate t-tbar events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of t-tbar pairs to the expected superposition of standard model t-tbar, non-t-tbar backgrounds, and a simple resonance model based on a sequential Z' boson. We establish upper limits for sigma(p-pbar to Z') times Br(Z' to t-tbar) in the Z' mass interval from 450 GeV/c2 to 900 GeV/c2. A topcolor leptophobic Z' is ruled out below 720 GeV/c2, and the cross section of any narrow Z'-like state decaying to t-tbar is found to be less than 0.64 pb at 95% C.L. for M(Z') above 700 GeV/c2.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We search for evidence of resonant top quark pair production in 955 pb-1 of p-pbar collisions at sqrt(s)=1.96 TeV recorded with the CDF II detector at the Fermilab Tevatron. | contribution 0.70 | 0.96 | 0.02 | asserted 0.69 |
| s1 | For fully reconstructed candidate t-tbar events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of t-tbar pairs to the expected superposition of standard model t-tbar, non-t-tbar backgrounds, and a simple resonance model based on a sequential Z' boson. | method 0.99 | 0.94 | 0.03 | asserted 0.74 |
| s2 | We establish upper limits for sigma(p-pbar to Z') times Br(Z' to t-tbar) in the Z' mass interval from 450 GeV/c2 to 900 GeV/c2. | result 0.95 | 0.97 | 0.24 | asserted 1.00 |
| s3 | A topcolor leptophobic Z' is ruled out below 720 GeV/c2, and the cross section of any narrow Z'-like state decaying to t-tbar is found to be less than 0.64 pb at 95% C.L. for M(Z') above 700 GeV/c2. | result 0.98 | 0.96 | 0.90 | asserted 1.00 |
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The paper
Original abstract
We search for evidence of resonant top quark pair production in 955 pb-1 of p-pbar collisions at sqrt(s)=1.96 TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate t-tbar events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of t-tbar pairs to the expected superposition of standard model t-tbar, non-t-tbar backgrounds, and a simple resonance model based on a sequential Z' boson. We establish upper limits for sigma(p-pbar to Z') times Br(Z' to t-tbar) in the Z' mass interval from 450 GeV/c2 to 900 GeV/c2. A topcolor leptophobic Z' is ruled out below 720 GeV/c2, and the cross section of any narrow Z'-like state decaying to t-tbar is found to be less than 0.64 pb at 95% C.L. for M(Z') above 700 GeV/c2.
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References
How the literature uses it
20 arXiv papers cite this in 23 sentences
Papers citing it · 12 sentences without a confident label
Uses its method or tool 3 papers
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In our simulation we have followed the analysis in [ref] and have generated the events with MADGRAPH/MADEVENT v4 [ref] (with the matrix element properly modified to include the energy dependence of the width), using PYTHIA [ref] for hadronization/showering effects and PGS4 [ref] and DELPHES 1.9 [ref] for detector simulation.
Single Vectorlike Quark Production at the LHC · A benchmark model · 1.00
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In our simulation we have followed the analysis in [ref] (the same as in the previous section).
The Higgs Boson and New Physics at the TeV Scale · Yukawa couplings to fermions · 0.97
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Constrained Fit plus Template The method that uses the least assumptions reconstructs the invariant mass using a constrained fit [ref] and is performed requiring at least one identified $b$ jet.
Properties of the Top Quark · CDF · 0.98
Uses its data or values 5 papers
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Using 955 pb$^-1$, CDF finds $M_Z'>$ 720 GeV/c$^2$ (expected limit: 710 GeV/c$^2$) [ref] while finds $M_Z'>$ 760 GeV/c$^2$ (expected limit: 795 GeV/c$^2$) [ref] using 2.1 fb$^-1$ of data.
Top Quark Pair Production and Properties Measurements at the Tevatron · Search for a Narrow-Width Resonance decaying into · 0.89
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The current best limit on the cross section of a $tt̅$ resonance is 570 fb for a resonance of 900 GeV [ref] .
Prospects for top-prime quark discovery at the Tevatron · The $t^'$ search in the $(Wj)(Wj)$ final state at the Tevatron · 0.85
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With a $0.96$ data set this CDF analysis excludes a leptophobic $Z^'$ with a mass less than 720 [ref] at the $95%$ confidence level.
Top Quark Physics at the Tevatron · Search for Resonances · 0.85
Cites it as background 3 papers
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The potential to observe new physics in $m_tt̅$ at hadron colliders has been extensively discussed in previous literature [ref] .
The Higgs Boson and New Physics at the TeV Scale · The Higgs mass in the modified model · 0.96
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The potential to observe new physics in $m_tt̅$ at hadron colliders has been discussed in previous literature [ref] .
Extra Higgs bosons in ttbar production at the LHC · Top quarks from scalar Higgs bosons · 0.97
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Previous searches mostly considered cases where in one or both of the top-quark decays, the intermediate $W$ boson decays leptonically and hence the top-quark decays result in one or two isolated leptons, missing energy from the neutrinos, and jets in the final state [ref] .
Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at sqrt(s) = 7 TeV · Introduction · 0.98
What it cites · 2 sentences without a confident label
Compares with 1 paper
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This study is complementary to Ref. [ref] , which uses a different event selection and reconstruction of the $$ kinematics.
Search for resonant ttbar production in ppbar collisions at sqrt{s}=1.96 TeV · Introduction · 0.97
Cites as background 3 papers
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More recently, resonant top pairs have been suggested as signatures for Kaluza-Klein (KK) states of gluons, weak bosons, and gravitons [ref] ; in some of these models the KK excitation couples strongly to the top quark and $$ is the dominant decay mode.
Resonances from Two Universal Extra Dimensions · Introduction · 0.83
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More recently, resonant top pairs have been suggested as signatures for Kaluza-Klein (KK) states of gluons, weak bosons, and gravitons [ref] ; in some of these models the KK excitation couples strongly to the top quark and $$ is the dominant decay mode.
Searching for the Kaluza-Klein Graviton in Bulk RS Models · Introduction · 0.83
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More recently, resonant top pairs have been suggested as signatures for Kaluza-Klein (KK) states of gluons, weak bosons, and gravitons [ref] ; in some of these models the KK excitation couples strongly to the top quark and $$ is the dominant decay mode.
The Bulk RS KK-gluon at the LHC · Introduction · 0.83
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