Measurements of ttW differential cross sections and the leptonic charge asymmetry at $\sqrt{s}$ = 13 TeV

Abstract

Measurements of properties of top quark-antiquark pair production in association with a W boson in proton-proton collisions at a center-of-mass energy of 13 TeV are presented, using a data sample corresponding to an integrated luminosity of 138 fb${}^{-1}$, recorded by the CMS experiment at the CERN LHC. Events are selected based on the presence of either two leptons with the same electric charge or three leptons, and multiple jets and b-tagged jets. We present measurements of differential production cross sections as a function of kinematic variables sensitive to different aspects of the process modeling, using a multivariate discriminator in the two-lepton selection region and a simple selection-based method in the three-lepton region. The normalized cross section measurements are generally consistent with the standard model expectations, while we observe larger values compared to the expectations in the absolute cross section measurements, consistent with previous inclusive cross section measurements. In addition, we measure the leptonic charge asymmetry of this process, obtaining an observed value of $A_{\text{c}}^{\ell }$ = $-$0.19 ${}_{-0.18}^{+0.16}$, consistent with the expectation of $-$0.085 $\pm$ 0.006 predicted by next-to-leading order simulations.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-24-003 (CMS Public Pages)

References in corpus (33)

• XGBoost: A Scalable Tree Boosting System
• 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
• An Introduction to PYTHIA 8.2
• FastJet user manual
• 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 from high-precision collider data
• PDF4LHC recommendations for LHC Run II
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Merging meets matching in MC@NLO
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
• Charge asymmetry of heavy quarks at hadron colliders
• Charge asymmetry in hadroproduction of heavy quarks
• Jet Flavour Classification Using DeepJet
• Large NLO corrections in $t\bar{t}{W}^{\pm }$ and $t\bar{t}t\bar{t}$ hadroproduction from supposedly subleading EW contributions
• Efficient Identification of Boosted Semileptonic Top Quarks at the LHC
• Top-quark pair hadroproduction in association with a heavy boson at NLO+NNLL including EW corrections
• The CMS statistical analysis and combination tool: COMBINE
• Strong tW Scattering at the LHC
• On the maximal use of Monte Carlo samples: re-weighting events at NLO accuracy
• Associated production of a top quark pair with a heavy electroweak gauge boson at NLO+NNLL accuracy
• Top-quark charge asymmetry and polarization in $t\bar{t}{W}^{\pm }$ production at the LHC
• Associated top quark pair production with a heavy boson: differential cross sections at NLO+NNLL accuracy
• Higgs boson production in association with a top-antitop quark pair in next-to-next-to leading order QCD
• On improving NLO merging for $t\bar{t}W$ production
• Precise predictions for the associated production of a $W$ boson with a top-antitop quark pair at the LHC
• Top-quark pair production in association with a $W^{\pm }$ gauge boson in the POWHEG-BOX
• The simplest of them all: $t\bar{t}{W}^{\pm }$ at NLO accuracy in QCD
• Automated simulations beyond the Standard Model: supersymmetry