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Measurement of top quark polarization in top-antitop events from proton-proton collisions at sqrt(s) = 7 TeV using the ATLAS detector
High Energy Physics - Experiment · Submitted 24 Jul 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The measurements obtained, alpha_l P_CPC = -0.035 +/- 0.014 (stat) +/- 0.037 (syst) and alpha_l P_CPV = 0.020 +/- 0.016 (stat) +0.013 -0.017 (syst), are in good agreement with the Standard Model prediction of negligible top quark polarization.
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The abstract, sentence by sentence
This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb^-1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at sqrt(s) = 7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of alpha_l P, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving (CPC) or a CP violating (CPV) production process. The measurements obtained, alpha_l P_CPC = -0.035 +/- 0.014 (stat) +/- 0.037 (syst) and alpha_l P_CPV = 0.020 +/- 0.016 (stat) +0.013 -0.017 (syst), are in good agreement with the Standard Model prediction of negligible top quark polarization.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb^-1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at sqrt(s) = 7 TeV. | contribution 0.92 | 0.96 | 0.04 | asserted 1.00 |
| s1 | Final states containing one or two isolated leptons (electrons or muons) and jets are considered. | method 0.98 | 0.53 | 0.02 | asserted 0.92 |
| s2 | Two measurements of alpha_l P, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving (CPC) or a CP violating (CPV) production process. | method 0.73 | 0.95 | 0.04 | asserted 0.99 |
| s3 | The measurements obtained, alpha_l P_CPC = -0.035 +/- 0.014 (stat) +/- 0.037 (syst) and alpha_l P_CPV = 0.020 +/- 0.016 (stat) +0.013 -0.017 (syst), are in good agreement with the Standard Model prediction of negligible top quark polarization. | result 0.99 | 0.97 | 0.92 | asserted 0.92 |
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The paper
Original abstract
This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb^-1 of proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at sqrt(s) = 7 TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of alpha_l P, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving (CPC) or a CP violating (CPV) production process. The measurements obtained, alpha_l P_CPC = -0.035 +/- 0.014 (stat) +/- 0.037 (syst) and alpha_l P_CPV = 0.020 +/- 0.016 (stat) +0.013 -0.017 (syst), are in good agreement with the Standard Model prediction of negligible top quark polarization.
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References
How the literature uses it
28 arXiv papers cite this in 30 sentences
Papers citing it · 18 sentences without a confident label
Uses its method or tool 1 paper
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Experimentally, event reconstruction in this case is performed via maximum-likelihood criteria, such as the neutrino-weighting method [ref] , used in [ref] , or matrix-element weighting techniques [ref] , as in [ref] (cf. also sec.
MT2-reconstructed invisible momenta as spin analizers, and an application to top polarization · Top polarization from angular variables · 0.88
Uses its data or values 3 papers
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The longitudinal polarization of top-quarks coming from top-squark decays into neutralinos depends on the mass difference between the top-squark and the neutralino, as well as on the mixing in both sectors, and can take any value between $-1$ and $+1$, while the measurements of ATLAS [ref] and CMS [ref] are in good agreement with the SM prediction of negligible top-quark polarization.
Top-quark Polarization and Asymmetries at the LHC in the Effective Description of Squark Interactions · Introduction · 0.87
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The ATLAS collaboration also observed the polarization at 7 TeV beam energy, assuming CP conserving $tt$ production and decay process, to be $0.035±0.040$ [ref] , in agreement with the SM prediction.
Looking for bSM physics using top-quark polarization and decay-lepton kinematic asymmetries · Status of experimental results · 0.93
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With $5.4 fb^-1$ of data taken at $√(s) = 7$ ATLAS measured $B$ in two scenarios [ref] .
Measurement of Spin Correlations in $t\bar{t}$ Events from $pp$ Collisions at $\sqrt{s}$ = 7 TeV in the Lepton + Jets Final State with the ATLAS Detector · Recent Top Polarization Measurements · 0.81
Cites it as background 7 papers
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For the case of events with two neutrinos, such as production in the dileptonic channel, more complicated methods [ref] are employed in order to resolve the share of momentum between the two neutrinos in the event [ref] .
$\nu^2$-Flows: Fast and improved neutrino reconstruction in multi-neutrino final states with conditional normalizing flows · Introduction · 0.93
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In the search for NP, there are already some results from the LHC, which include those on the top-quark polarisation and anomalous couplings in the $Wtb$ vertex [ref] , which are relevant to the discussion in this paper.
Longitudinal top polarisation measurement and anomalous $Wtb$ coupling · Introduction · 0.82
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The ATLAS and CMS experiments at the LHC (7 and 8 TeV) have performed a number of top spin correlation and polarization measurements, using various sets of observables [ref] .
A set of top quark spin correlation and polarization observables for the LHC: Standard Model predictions and new physics contributions · Introduction · 0.94
What it cites · 19 sentences without a confident label
Uses the method or tool of 18 papers
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The likelihood for the event to correspond to a decay topology is calculated for each possible assignment of four jets selected from the up to five highest jets in the event, to the two $b$-quark jets and the two jets from the $W$-boson decay [ref] .
Measurement of the top quark mass with the template method in the top antitop -> lepton + jets channel using ATLAS data · Introduction · 1.00
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Making a hypothesis for the pseudorapidities of the two neutrinos ($η_1,η_2$), a weight is assigned for each permutation of jets, based on the compatibility of the total neutrino transverse momentum vector and the measured , accounting for resolution [ref] .
Performance of missing transverse momentum reconstruction in proton-proton collisions at 7 TeV with ATLAS · Introduction · 0.99
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These templates are produced by varying the MC event generator, initial- and final- state radiation, color reconnection, fragmentation modeling, and the PDF sets, as detailed in Ref. [ref] .
Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at sqrt(s) = 7 TeV · Introduction · 0.92
Uses data or values from 1 paper
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For the $W+$jets background in the final state, the overall normalization is varied according to the residual uncertainty after the rescaling based on the measured charge asymmetry [ref] .
Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector · Introduction · 0.88
Compares with 2 papers
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The fitted $σ_$ is in good agreement with the SM prediction as obtained from NNLO QCD calculations [ref] .
Top++: a program for the calculation of the top-pair cross-section at hadron colliders · Introduction · 0.84
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The fitted $σ_$ is in good agreement with the SM prediction as obtained from NNLO QCD calculations [ref] .
The total top quark pair production cross-section at hadron colliders through O(alpha_S^4) · Introduction · 0.84
Cites as background 7 papers
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Here, $C$ represents the $tt̅$ spin correlation, $P_1$ ($P_2$) represents the degree of polarization of the top (antitop) quark along the chosen quantization axis, and $α_i$ is the spin-analyzing power of the final state object [ref] , which is a measure of the sensitivity of the daughter particle to the spin state of the parent.
QCD-corrected spin analysing power of jets in decays of polarized top quarks · Introduction · 0.83
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Here, $C$ represents the $tt̅$ spin correlation, $P_1$ ($P_2$) represents the degree of polarization of the top (antitop) quark along the chosen quantization axis, and $α_i$ is the spin-analyzing power of the final state object [ref] , which is a measure of the sensitivity of the daughter particle to the spin state of the parent.
Angular Correlations in Top Quark Pair Production and Decay at Hadron Colliders · Introduction · 0.83
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The short lifetime of the top quark [ref] implies that it decays before hadronization takes place, allowing its spin state to be studied using the angular distributions of its decay products.
Determination of the width of the top quark · Introduction · 0.82
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