Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 8 TeV

CMS Collaboration

REVIEW

Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 8 TeV

CMS Collaboration

High Energy Physics - Experiment · Submitted 29 Dec 2013 · 38 references

Pith's verdict: A careful, incremental 8 TeV ttbar dilepton cross-section measurement — 239 ± 13 pb, well-executed, no surprises, worth a referee's time.

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arXiv ID1312.7582 (version 2)

Pith IDNYD7Q4F3, Pith's permanent record of this paper and its review

CitationCMS Collaboration. "Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 8 TeV." arXiv:1312.7582 (2013). https://pith.science/paper/NYD7Q4F3

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Editor's note

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This is the CMS 8 TeV dilepton ttbar cross-section paper, and it is exactly what it says it is: the 7 TeV analysis (their ref. [4]) rerun on 5.3 fb^-1 at 8 TeV with the same event selection, the same Rout/in Drell-Yan estimate, and the same loose-tight non-prompt method. The new thing is the number: 239 ± 2 (stat) ± 11 (syst) ± 6 (lum) pb, with the three channels (244.3, 235.3, 239.0 pb) combined by BLUE. That is a genuine new measurement at a new energy, and it is the kind of result that feeds PDF fits and αs extractions. It is not a new method, and the paper does not pretend otherwise. Worth saying plainly: the analysis is clean. Backgrounds are anchored to data where they can be, the systematic budget is broken out per source and per channel in Table 1, and the correlations used in the combination are stated. The mass-dependence parametrization in Eq. (1) is a useful addition for anyone rescaling to a different mt. The soft spots are the usual ones and they are not fatal. The Drell-Yan scale factors are large (1.3 to 1.7) and they dominate the same-flavour systematics — 10.8 and 10.3 pb in Table 1 — which is why the ee and mumu channels are so much weaker than emu. The signal acceptance comes from MadGraph+PYTHIA, and a bias there propagates one-for-one into σtt; the paper bounds it with scale variation (2.3%), matching thresholds (1.6%), PYTHIA-vs-HERWIG (1.4%), and a MadGraph-vs-Powheg check (2.2%). Those agree at the ~2% level, so the concern is real but bounded, and I would not treat it as load-bearing. The one thing I would push on is the abstract's 'in agreement with the standard model': 239 versus 252.9 pb is a ~1σ downward shift, and the theory uncertainty is comparable to the experimental one, so 'consistent' is fair but 'agreement' is doing a little work. Minor. Who should read it: anyone doing top physics, PDF fits, or BSM searches where ttbar is the dominant background. It deserves a serious referee — the measurement is standard but the systematics table and the combination are the parts that need checking.

Referee report

Major objections (1)

[§5 and Table 1] The signal-acceptance uncertainty budget does not separately vary the PDFs in the acceptance calculation. The paper varies the renormalisation and factorisation scales (2.3%), the matrix-element/parton-shower matching thresholds (1.6%), the hadronisation model (1.4%), and compares LO and NLO generators (2.2%), all at the ~2% level, but the PDF dependence of the acceptance (as distinct from the PDF dependence of the total cross section, which is covered by the 11.7 pb theory uncertainty) is not tested. Since epsilon_total in Table 3 is the denominator of the cross section, a PDF-induced bias in the acceptance would propagate one-for-one into sigma_tt. The paper should state this explicitly and, if possible, estimate the size of the effect by reweighting the simulated signal to alternative PDF sets. The impact is likely small given the consistency of the existing tests, but the gap should be acknowledged in the systematic budget.

Minor objections (10)

[§3] The sentence 'the pair of opposite-sign leptons with the largest value of total transverse momentum is selected' is ambiguous: 'total transverse momentum' could mean the vector sum, which would be small for a back-to-back pair. It should read 'sum of transverse momenta' or 'scalar sum of transverse momenta'.
[§4] The non-prompt lepton method is cited to reference [25], which is listed as 'Submitted to JHEP' and was unpublished at the time of writing. The text describes the method in enough detail that the citation is not the sole support, but a published reference would be preferable.
[§6, Eq. (1)] The parametrization coefficients in Eq. (1) are quoted without uncertainties, and the range 160-185 GeV is much wider than the present uncertainty on the top-quark mass (about 1 GeV). The paper should either state the uncertainty on the coefficients or restrict the quoted range to the region actually used.
[Table 1] The 'Total systematic' row is the quadrature sum of the individual rows, which is correct, but the table does not state this explicitly. A footnote would help the reader check the arithmetic.
[Table 3] The epsilon_total uncertainties (0.012, 0.017, 0.033) are not decomposed, so the reader cannot check that they are consistent with the efficiency-related rows of Table 1. A brief statement in the text would help.
[§3] The trigger efficiency is stated to be 'approximately 90% to 93% for the three final states', while the data-to-simulation scale factors have an average value of 0.96. The relationship between the two numbers is not entirely clear; a sentence would help.
[Figure 3 caption] The caption says the distributions are shown 'after the b-jet multiplicity selection', while the text says the same for Fig. 3 and 'before the b-jet requirement' for the right panel of Fig. 2. The wording is slightly inconsistent; the caption should clarify whether the b-jet requirement is applied.
[§5] The tau-lepton modeling uncertainty (TAUOLA) is not separately estimated. Since tau -> lepton decays contribute to the acceptance, a brief statement on the size of this effect would help.
[§4] The Drell-Yan data-to-simulation scale factors (1.3 ± 0.4, 1.7 ± 0.5, 1.6 ± 0.5) are all significantly above unity, and the Rout/in method assumes the data/MC ratio is the same inside and outside the Z window. The paper assigns a large uncertainty (10.8 and 10.3 pb) in the e+e- and mu+mu- channels, which covers the effect, but the assumption itself is not tested. Since the e±mu∓ channel dominates the combination and has only 1.5 pb Drell-Yan uncertainty, this does not affect the headline result, but the paper should state the assumption explicitly and, if possible, test it with an alternative control region.
[Abstract] The abstract quotes 239 ± 2 ± 11 ± 6 pb, while the text quotes 239.0 ± 2.1 ± 11.3 ± 6.2 pb. The rounding is fine, but the abstract could state that the values are rounded.

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The paper

The paper claims

The CMS experiment measures how often proton collisions at 8 TeV produce a top quark and its antiparticle, finding 239 picobarns with about 5% total uncertainty.

The reading

This paper reports a counting measurement of the top-antitop quark pair production rate in proton-proton collisions at a centre-of-mass energy of 8 TeV, using 5.3 inverse femtobarns of data recorded by CMS at the LHC. The authors select the cleanest of the top-pair decay modes, the dilepton channel, where each top quark decays to a W boson and a bottom quark and the two W bosons both decay to an electron or a muon, leaving two opposite-charge leptons, missing transverse momentum from the neutrinos, and two jets of which at least one carries the displaced vertex signature of a bottom quark. Counting the surviving events and dividing by the acceptance times efficiency computed from simulation gives the cross section. The result, $239.0$ pb, sits close to the standard-model prediction of $252.9$ pb computed at next-to-next-to-leading order with soft-gluon resummation, and the three separate final states (electron-electron, muon-muon, electron-muon) give compatible numbers. The value of the measurement is that it converts a well-understood theoretical prediction into a tested number: if the standard model's QCD calculation and the quark content of the proton are right, this is the rate that must come out, so the comparison constrains both.

What carries the argument

The load-bearing machinery is the product $epsilon_{total}$ of geometric acceptance, selection efficiency, and dilepton branching fraction, computed from MadGraph plus Pythia simulation, together with a set of data-driven background estimates. The cross section is obtained by subtracting the estimated background from the observed event count and dividing by $epsilon_{total}$ times the integrated luminosity, so the whole measurement pivots on how faithfully the simulation models which top-pair events survive the lepton, jet, missing-energy, and bottom-tagging requirements. Backgrounds are handled with three separate data-driven devices: the Rout/in method, which normalises simulated Drell-Yan events to the observed yield inside the Z mass window and extrapolates outside it; a loose-to-tight lepton ratio measured in Z-enriched and dijet samples, used to weight loose-loose events into an estimate of non-prompt leptons; and simulated yields for single-top and diboson processes, assigned a 20% cross-section uncertainty. The three channels are then combined with the BLUE method, treating systematic uncertainties as fully correlated except the lepton-efficiency terms.

Extended reading notes

Core claim

The paper's central claim is that the top-antitop production cross section in proton-proton collisions at $8$ TeV, measured in the dilepton final state with at least one identified bottom-quark jet, is $239.0$ pb for an assumed top-quark mass of $172.5$ GeV, with uncertainties of $2.1$ pb statistical, $11.3$ pb systematic, and $6.2$ pb from the integrated luminosity. The individual channels give $244.3$ pb ($e^+e^-$), $235.3$ pb ($mu^+mu^-$), and $239.0$ pb ($e^pm mu^mp$), combined with the BLUE method under stated correlations. The authors present this as agreement with the standard-model prediction of $252.9$ pb from TOP++ at next-to-next-to-leading order with next-to-next-to-leading-log resummation, and they provide a parametrisation of the mass dependence so that the number can be rescaled for any assumed top-quark mass between 160 and 185 GeV; for the then-current world-average mass of $173.2$ GeV they quote $237.5$ pb. This is not a discovery of a new phenomenon but a precision anchor: it fixes a standard-model rate to roughly five percent and thereby makes the same final state usable as a calibrated background estimate in searches for new physics.

Load-bearing premise

The extracted cross section is only as good as the simulated acceptance: the analysis assumes that MadGraph plus Pythia, with the variations the authors chose to test, correctly predicts which top-pair events survive the lepton, jet, missing-energy, and bottom-tag selections, so any unmodelled bias in that acceptance shifts the quoted number proportionally.

Editorial extensions

If this is right

The top-antitop rate at 8 TeV is pinned to about five percent, so any model predicting a different production rate in this channel is now constrained at that level.
Because the dilepton final state is a background to searches for new physics, the measured rate gives those searches a data-anchored normalisation rather than a purely theoretical one.
The quoted mass dependence, $\sigma_{t\bar t}/\sigma_{t\bar t}(172.5) = 1.00 - 0.009(m_t - 172.5) - 0.000168(m_t - 172.5)^2$, lets the same event counts be reinterpreted for any assumed top-quark mass without redoing the analysis.
Agreement between the three lepton channels, which have different backgrounds and different jet-energy-scale sensitivity, bounds channel-specific mismodelling of the detector response.
Combined with the equivalent 7 TeV measurement, the ratio of rates at the two energies tests the gluon distribution inside the proton at the momentum fractions that dominate top-pair production.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

The precision here is limited not by statistics (2 pb) but by the modelling of the signal acceptance and by the jet energy scale, which suggests that the next real gain in this channel comes from better generators and jet calibration rather than more data.
The systematic budget in the electron and muon pair channels is dominated by the Drell-Yan estimate and by missing-energy response to jets, both of which are small in the mixed-flavour channel; this is why the mixed channel dominates the combination and why a future analysis might weight it even more heavily.
Because the measured value sits slightly below the prediction, and the prediction's own uncertainty from scales and parton distributions is comparable to the measurement's, the interesting quantity is the ratio of measured to predicted rather than either number alone; a global fit that treats this ratio jointly with the 7 TeV result would sharpen constraints on the gluon density.
The same event-selection chain, with the bottom-tag requirement inverted or relaxed, would give a data-driven estimate of the mistag background for other analyses; the paper's loose-to-tight and Rout/in techniques are portable to any dilepton search at the LHC.

Original abstract

The top-antitop quark (t t-bar) production cross section is measured in proton-proton collisions at sqrt(s) = 8 TeV with the CMS experiment at the LHC, using a data sample corresponding to an integrated luminosity of 5.3 inverse femtobarns. The measurement is performed by analysing events with a pair of electrons or muons, or one electron and one muon, and at least two jets, one of which is identified as originating from hadronisation of a bottom quark. The measured cross section is 239 +/- 2 (stat.) +/- 11 (syst.) +/- 6 (lum.) pb, for an assumed top-quark mass of 172.5 GeV, in agreement with the prediction of the standard model.

The compiled record

The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,179 input tokens, $0.0001 reported.

What the abstract itself states, as probabilities: claims first 0.02 · states limitation 0.16 · human participants 0.01 · controlled comparison 0.10 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.62 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; show every role.

The top-antitop quark (t t-bar) production cross section is measured in proton-proton collisions at sqrt(s) = 8 TeV with the CMS experiment at the LHC, using a data sample corresponding to an integrated luminosity of 5.3 inverse femtobarns. The measurement is performed by analysing events with a pair of electrons or muons, or one electron and one muon, and at least two jets, one of which is identified as originating from hadronisation of a bottom quark. The measured cross section is 239 +/- 2 (stat.) +/- 11 (syst.) +/- 6 (lum.) pb, for an assumed top-quark mass of 172.5 GeV, in agreement with the prediction of the standard model.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	The top-antitop quark (t t-bar) production cross section is measured in proton-proton collisions at sqrt(s) = 8 TeV with the CMS experiment at the LHC, using a data sample corresponding to an integrated luminosity of 5.3 inverse femtobarns.	contribution 0.83	0.95	0.06	asserted 1.00
s1	The measurement is performed by analysing events with a pair of electrons or muons, or one electron and one muon, and at least two jets, one of which is identified as originating from hadronisation of a bottom quark.	method 1.00	0.90	0.03	asserted 0.99
s2	The measured cross section is 239 +/- 2 (stat.) +/- 11 (syst.) +/- 6 (lum.) pb, for an assumed top-quark mass of 172.5 GeV, in agreement with the prediction of the standard model.	result 1.00	0.97	0.95	asserted 1.00

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.92.

What was examined, and what was not

sources read

arXiv listing abstract v2

not examined

full text
figures and tables
references and citing sentences
relations to other papers

levels run

P abstract

not run

S sections
T body sentences
C citations
R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

Figures

**Figure 1.** shows the pT distributions of the highest-pT lepton and jet after jet multiplicity selection, for all three final states combined. In this and the following figures the signal yields refer to an assumed top-quark mass of 172.5 GeV. The hatched regions correspond to the total statistical uncertainties in the predicted event yields. The ratio of the data to the sum of simulations and data-based predictions for the signal and backgrounds is shown in the bottom panels. A detailed description of the different background estimates is given in section 4. The multiplicities of selected…

**Figure 2.** Jet multiplicity (left) in events passing the dilepton criteria, and (right) b-jet multi

**Figure 3.** Distributions of (upper left) the dilepton invariant-mass, (upper right) the

Figures reproduced from arXiv:1312.7582 by the authors.

References

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Renormalisation group evolution effects on global SMEFT analyses
hep-ph 2024-12 conditional novelty 6.0 of 10

Including RGE effects in a global SMEFT fit improves bounds on poorly constrained four-quark operators but weakens limits on modified Z q qbar couplings by up to a factor of ten.
The Path to Proton Structure at One-Percent Accuracy
hep-ph 2021-09 accept novelty 6.0 of 10

NNPDF4.0 delivers a global proton PDF set with roughly halved uncertainties, an automatically selected neural-network fitting methodology, and an open-source release of the full fitting framework.
Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs
hep-ph 2020-12 accept novelty 6.0 of 10

A new global fit of proton parton distributions to 4363 data points, including LHC W, Z, jet and top measurements, shifts the down valence quark, the d-bar/u-bar ratio and the strange quark, and reduces many uncertainties.
Top, Higgs, Diboson and Electroweak Fit to the Standard Model Effective Field Theory
hep-ph 2020-12 accept novelty 6.0 of 10

Combining top, Higgs, diboson and electroweak data in a single linear dimension-6 SMEFT fit yields no significant evidence for physics beyond the Standard Model, with 95% CL limits on 34 operator coefficients.
Multi-jet merged top-pair production including electroweak corrections
hep-ph 2018-03 accept novelty 6.0 of 10

First NLO electroweak calculation of top-pair plus jet production, folded into a multi-jet merged QCD+EW prediction that matches the ATLAS boosted top transverse-momentum spectrum.
Parton distributions with small-x resummation: evidence for BFKL dynamics in HERA data
hep-ph 2017-10 conditional novelty 6.0 of 10

Adding NLLx small-x resummation to a global NNPDF fit removes a fixed-order instability at low x and improves the description of HERA inclusive and charm data by about 120 units of chi-squared at NNLO.
Parton distributions from high-precision collider data
hep-ph 2017-06 conditional novelty 6.0 of 10

NNPDF3.1 delivers a new global set of proton parton distributions with a freely fitted charm quark, top-pair and Z-boson transverse momentum data included for the first time, and substantially reduced gluon uncertainties.
NLO electroweak corrections to off-shell top-antitop production with leptonic decays at the LHC
hep-ph 2016-07 accept novelty 6.0 of 10

Full off-shell NLO electroweak corrections to pp to e+ nu mu- nubar b bbar at the 13 TeV LHC stay below 1 per cent inclusively but reach roughly 15 per cent at high transverse momentum.
Constraining the top-Higgs sector of the Standard Model Effective Field Theory
hep-ph 2016-05 accept novelty 6.0 of 10

Electric dipole moment measurements bound CP-violating top-Higgs couplings about three orders of magnitude more tightly than collider searches, once one-loop mixing of the top operators into light-fermion dipoles is included.
Reconstruction and identification of tau lepton decays to hadrons and tau neutrino at CMS
physics.ins-det 2015-10 accept novelty 6.0 of 10

CMS's hadrons-plus-strips tau reconstruction reaches 50-60% identification efficiency at 8 TeV, with jet, electron, and muon misidentification rates between roughly one per mille and a few per cent, validated against data.
Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions
hep-ph 2015-10 accept novelty 6.0 of 10

Combining EDM limits with LHC Run 1 data gives the current best bounds on CP-violating Higgs-quark and Higgs-gluon couplings, and hadronic/nuclear matrix element uncertainties dilute those bounds by up to orders of magnitude.
Search for a charged Higgs boson in pp collisions at sqrt(s) = 8 TeV
hep-ex 2015-08 accept novelty 6.0 of 10

No charged Higgs boson signal appears in 8 TeV CMS data; 95% CL upper limits reach 1.2 to 0.15% on B(t to H+b)B(H+ to tau nu) and 2.0 to 0.13 pb on sigma(pp to t(b)H+) assuming B(H+ to tb) = 1.
Parton distributions with threshold resummation
hep-ph 2015-07 conditional novelty 6.0 of 10

Fitting parton distributions with threshold-resummed cross sections suppresses the large-x PDFs and largely cancels the enhancement that resummation adds to hadronic cross sections at high invariant mass.
Top-pair production and decay at NLO matched with parton showers
hep-ph 2014-12 conditional novelty 6.0 of 10

The authors build a POWHEG generator for top-pair production and decay that includes NLO radiation from the decaying top quarks, and validate it against an exact off-shell NLO calculation.
Parton distributions for the LHC Run II
hep-ph 2014-10 accept novelty 6.0 of 10

NNPDF3.0 delivers a global PDF fit whose fitting machinery is validated by closure tests, recovering the known input PDF with 69.9% one-sigma and 94.8% two-sigma coverage against expected 68% and 95%.
NNNLO soft-gluon corrections for the top-antitop pair production cross section
hep-ph 2014-05 conditional novelty 6.0 of 10

Adding NNNLO soft-gluon corrections to the exact NNLO top-antitop cross section raises the predicted rate by 2.6 to 5.1 percent depending on collider energy and shrinks the scale-variation band.
Illuminating the photon content of the proton within a global PDF analysis
hep-ph 2017-12 accept novelty 5.0 of 10

A global PDF fit constrained by the LUXqed structure-function relation yields a photon PDF known to a few percent, carrying about 0.42% of the proton momentum at the Z mass, with photon-initiated LHC corrections reach...
Measurement of the t-tbar production cross section in the e-mu channel in proton-proton collisions at sqrt(s) = 7 and 8 TeV
hep-ex 2016-03 accept novelty 5.0 of 10

The top quark pair production cross section is measured to 3.6-3.7% precision at 7 and 8 TeV, agrees with NNLO QCD, and yields a top pole mass of 173.8 GeV.
Measurement of the differential cross-section of highly boosted top quarks as a function of their transverse momentum in $\sqrt{s}$ = 8 TeV proton-proton collisions using the ATLAS detector
hep-ex 2015-10 conditional novelty 5.0 of 10

The differential ttbar cross-section as a function of hadronic top quark pT is measured from 300 to 1200 GeV with 13 to 29 percent total uncertainty, and most NLO and LO matrix-element generators agree within the corr...
Parton distributions in the LHC era: MMHT 2014 PDFs
hep-ph 2014-12 accept novelty 5.0 of 10

New MMHT2014 proton parton distributions, fitted to an expanded global data set with improved parameterisation and theory, differ from MSTW2008 mainly in the down-up valence difference at small x and in a larger, less...
The PDF4LHC21 combination of global PDF fits for the LHC Run III
hep-ph 2022-03 accept novelty 4.0 of 10

PDF4LHC21 combines the CT18, MSHT20 and NNPDF3.1 global fits into a single Hessian and Monte Carlo PDF ensemble that agrees with PDF4LHC15 and slightly reduces gluon-driven uncertainties.
Constraining top quark effective theory in the LHC Run II era
hep-ph 2015-12 accept novelty 4.0 of 10

A global fit of 13 dimension-six top-quark operators to 227 Tevatron and LHC measurements finds all Wilson coefficients consistent with zero at 95% confidence.
Measurement of the t t-bar production cross section in the all-jets final state in pp collisions at sqrt(s) = 8 TeV
hep-ex 2015-09 accept novelty 4.0 of 10

The all-jets ttbar cross section at 8 TeV is 275.6 +/- 6.1 (stat) +/- 37.8 (syst) +/- 7.2 (lumi) pb, consistent with the standard model, while the measured top quark pT spectrum is softer than all QCD predictions tested.
Measurement of the $t\bar{t}$ production cross-section using $e\mu$ events with $b$-tagged jets in $pp$ collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS detector
hep-ex 2014-06 accept novelty 4.0 of 10

ATLAS measures the top quark pair production cross-section to be 182.9 +/- 7.1 pb at 7 TeV and 242.9 +/- 8.8 pb at 8 TeV, consistent with next-to-next-to-leading-order QCD predictions.
High precision fundamental constants at the TeV scale
hep-ph 2014-05 conditional novelty 3.0 of 10

The report compiles 2014 determinations of the strong coupling and the top quark mass, shows that independent extractions scatter beyond their quoted uncertainties, and recommends a standing working group plus scheme-...
Snowmass 2021 whitepaper: Proton structure at the precision frontier
hep-ph 2022-03 accept novelty 2.0 of 10

A Snowmass community whitepaper argues that pushing unpolarized proton PDFs to N2LO and N3LO accuracy with controlled systematics is essential infrastructure for HL-LHC and EIC physics, and lays out the experimental, ...

How the literature uses it

50 arXiv papers cite this in 67 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 22 sentences without a confident label

Uses its method or tool 2 papers

The DY contribution is estimated using the “$R_out/in$” method [ref] , in which events with and final states are used to obtain a normalisation factor.

Measurement of the t-tbar production cross section in the e-mu channel in proton-proton collisions at sqrt(s) = 7 and 8 TeV · Event counting method · 1.00
For event selections, we require the following criteria [ref] . 1.

Dark decay of the top quark · Dilepton box · 0.95

Uses its data or values 24 papers

The experimental measurements used in the fit [ref] are included in Table [ref].

Top quark physics in the Large Hadron Collider era · Experimental inputs · 1.00
The experimental measurements used in the fit [ref] are included in Table [ref].

Constraining top quark effective theory in the LHC Run II era · Experimental inputs · 1.00
We investigate the sensitivity of such an analysis (ZPLscan) by calculating the number of heavy Higgs signal and background events for the dileptonic $$ final states $(l=e,μ)$ [equation] and for the lepton plus jets final states $(l=e,μ)$ [equation] assuming the branching ratios [equation] an integrated luminosity of $ℒ=100$ fb$^-1$, and selection efficiencies [ref] $ϵ_ll=0.22$ and $ϵ_lj=0.12$.

Production of heavy Higgs bosons and decay into top quarks at the LHC · Results · 0.86

Compares with it 6 papers

Compared to previous $$ measurements at 7 TeV [ref] and at 8 TeV [ref] the latest CMS results [ref] include the full CMS data samples with integrated luminosities of 5.0 $fb^-1$ (7 TeV) and 19.7 $fb^-1$ (8 TeV).

Measurements of the top-quark mass in fixed schemes and with alternative methods using the ATLAS and CMS detectors at the LHC · CMS Top-Quark Pole Mass Measurements · 0.87
Very good agreement is found with recent ATLAS and CMS data at both 7 TeV [ref] and 8 TeV [ref] energies.

NNNLO soft-gluon corrections for the top-antitop pair production cross section · Introduction · 0.98
This leads to a production cross section of [equation] in good agreement with NNLO+NNLL expectation [ref] and the latest CMS measurement [ref] .

Measurement of the ratio B(t to Wb)/B(t to Wq) in pp collisions at sqrt(s) = 8 TeV · Cross section measurement · 0.99

Cites it as background 9 papers

After initial measurement at the inclusive cross section level [ref] , where very good agreement with perturbative calculations at the NNLO+NNLL level in QCD [ref] has been observed, the attention in the study of top-pair production has shifted towards detailed differental measurements, see e.g. [ref] .

Multi-jet merged top-pair production including electroweak corrections · Introduction · 0.87
Inclusive and differential cross section measurements from proton-proton (pp) collisions at centre-of-mass energies of 7 and 8have been reported by the ATLAS [ref] and CMS collaborations [ref] .

Measurement of the t t-bar production cross section in the all-jets final state in pp collisions at sqrt(s) = 8 TeV · Introduction · 0.95
Both experiments have recently published measurements of the inclusive production cross-section in proton–proton ($pp$) collisions at centre-of-mass energies, $√(s)$, of 7 and 8 [ref] as well as differential cross-section measurements as functions of the top-quark transverse momentum () and rapidity ($y$), and of the mass ($m_tt̅$) and $y$ of the system [ref] .

Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at $\sqrt{s}=7$ TeV in the ATLAS detector · Introduction · 0.96

What it cites · 4 sentences without a confident label

Uses the method or tool of 13 papers

Jet energy corrections are also applied as a function of the jet $$ and $η$ [ref] .

Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS · Event selection · 0.99
Jets are identified as b jets using the combined secondary vertex algorithm (CSV) [ref] .

Identification of b-quark jets with the CMS experiment · Event selection · 1.00
The DY background is estimated using the “$R_out/in$” method [ref] in which the events outside of the Z mass window are obtained by normalising the event yield from simulation to the observed number of events inside the Z mass window.

Measurement of the t t-bar production cross section and the top quark mass in the dilepton channel in pp collisions at sqrt(s) =7 TeV · Background determination · 0.99

Uses data or values from 10 papers

The uncertainties on the b jet scale factors in signal events are approximately 2% for b jets and 10% for mistagged jets [ref] , depending on the $$ of the jets.

Identification of b-quark jets with the CMS experiment · Sources of systematic uncertainty · 0.96
In addition, an uncertainty in the cross sections for single-top-quark and VV backgrounds, taken from measurements and estimated to be approximately 20% [ref] , is added in quadrature.

Measurement of the ZZ production cross section and search for anomalous couplings in 2l2l' final states in pp collisions at sqrt(s) = 7 TeV · Sources of systematic uncertainty · 0.99
In addition, an uncertainty in the cross sections for single-top-quark and VV backgrounds, taken from measurements and estimated to be approximately 20% [ref] , is added in quadrature.

Measurement of WW Production and Search for the Higgs Boson in pp Collisions at sqrt(s) = 7 TeV · Sources of systematic uncertainty · 0.99

Compares with 1 paper

This value is compatible with $1.5±0.5$, which is estimated using a template fit as described in [ref] .

Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV · Background determination · 0.86

Cites as background 7 papers

A large sample of top-quark events has been collected at the Large Hadron Collider (LHC), and studies of top-quark production have been conducted in various decay channels as well as searches for deviations from the SM predictions [ref] .

Search for New Phenomena in ttbar Events with Large Missing Transverse Momentum in Proton-Proton Collisions at sqrt(s) = 7 TeV with the ATLAS Detector · Introduction · 0.93
A large sample of top-quark events has been collected at the Large Hadron Collider (LHC), and studies of top-quark production have been conducted in various decay channels as well as searches for deviations from the SM predictions [ref] .

Search for anomalous production of prompt like-sign muon pairs and constraints on physics beyond the Standard Model with the ATLAS detector · Introduction · 0.93
A large sample of top-quark events has been collected at the Large Hadron Collider (LHC), and studies of top-quark production have been conducted in various decay channels as well as searches for deviations from the SM predictions [ref] .

Measurement of the cross section for top-quark pair production in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector using final states with two high-pt leptons · Introduction · 0.93

Discussion

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