Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=5.02$ TeV with the ATLAS detector

Abstract

The inclusive top-quark pair ($t\bar{t}$) production cross-section ${\sigma }_{t\bar{t}}$ is measured in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=5.02$ TeV, using 257 pb${}^{-1}$ of data collected in 2017 by the ATLAS experiment at the LHC. The $t\bar{t}$ cross-section is measured in both the dilepton and single-lepton final states of the $t\bar{t}$ system and then combined. The combination of the two measurements yields ${\sigma }_{t\bar{t}}=67.5\pm 0.9\text{(stat.)}\pm 2.3\text{(syst.)}\pm 1.1\text{(lumi.)}\pm 0.2\text{(beam)}$ pb, where the four uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, and imperfect knowledge of both the integrated luminosity and the LHC beam energy, giving a total uncertainty of 3.9%. The result is in agreement with theoretical quantum chromodynamic calculations at next-to-next-to-leading order in the strong coupling constant, including the resummation of next-to-next-to-leading logarithmic soft-gluon terms, and constrains the parton distribution functions of the proton at large Bjorken-$x$.

arXiv comment50 pages in total, 9 figures, 3 tables. All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2018-40/

References in corpus (44)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Parton distributions for the LHC
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Parton distributions for the LHC Run II
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• Herwig++ Physics and Manual
• Parton distributions with LHC data
• Parton distributions from high-precision collider data
• PDF4LHC recommendations for LHC Run II
• New parton distribution functions from a global analysis of quantum chromodynamics
• The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• Herwig 7.0 / Herwig++ 3.0 Release Note
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• Event Generation with Sherpa 2.2
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
• Single-top hadroproduction in association with a W boson
• Percent level precision physics at the Tevatron: first genuine NNLO QCD corrections to q qbar -> t tbar + X
• Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation
• MCFM for the Tevatron and the LHC
• NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels
• NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction
• Soft-gluon resummation for Higgs boson production at hadron colliders
• The CT10 NNLO Global Analysis of QCD
• Uncertainties on alpha_S in global PDF analyses and implications for predicted hadronic cross sections
• Parton distributions from LHC, HERA, Tevatron and fixed target data: MSHT20 PDFs
• Parton Distribution Functions, ${\alpha }_s$ and Heavy-Quark Masses for LHC Run II
• The Path to Proton Structure at One-Percent Accuracy
• The t-tbar cross-section at 1.8 and 1.96 TeV: a study of the systematics due to parton densities and scale dependence
• Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO
• Precise Predictions for W + 4 Jet Production at the Large Hadron Collider
• Top-quark pair hadroproduction at next-to-next-to-leading order in QCD
• Isolating Wt production at the LHC
• A method and tool for combining differential or inclusive measurements obtained with simultaneously constrained uncertainties

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