Probing the flavour structure of dimension-6 EFT operators in multilepton final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

An analysis of the flavour structure of dimension-6 effective field theory (EFT) operators in multilepton final states is presented, focusing on the interactions of quarks with Z bosons. For the first time, the flavour structure of these operators is disentangled by simultaneously probing the interactions with different quark generations. The analysis targets the associated production of a top quark pair and a Z boson, as well as diboson processes in final states with at least three leptons, which can be electrons or muons. The data were recorded by the CMS experiment in the years 2016$-$2018 in proton-proton collisions at a centre-of-mass energy of 13 TeV and correspond to an integrated luminosity of 138 fb${}^{-1}$. Consistency with the standard model of particle physics is observed and limits are set on the selected Wilson coefficients, split into couplings to light- and heavy-quark generations.

Replaced 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-23-009 (CMS Public Pages)

References in corpus (35)

• 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 for the LHC Run II
• Dimension-Six Terms in the Standard Model Lagrangian
• Matching NLO QCD computations and parton shower simulations
• Parton distributions from high-precision collider data
• 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
• The Strongly-Interacting Light Higgs
• Vector boson pair production at the LHC
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Merging meets matching in MC@NLO
• NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
• The Standard Model as an Effective Field Theory
• ZZ production at hadron colliders in NNLO QCD
• W+W-, WZ and ZZ production in the POWHEG BOX
• Updated Global SMEFT Fit to Higgs, Diboson and Electroweak Data
• Higgs boson production in association with top quarks in the POWHEG BOX
• The SMEFTsim package, theory and tools
• Top, Higgs, Diboson and Electroweak Fit to the Standard Model Effective Field Theory
• Jet Flavour Classification Using DeepJet
• W+W-, WZ and ZZ production in the POWHEG BOX V2
• SMEFTsim 3.0 -- a practical guide
• The CMS statistical analysis and combination tool: COMBINE
• On the maximal use of Monte Carlo samples: re-weighting events at NLO accuracy
• Associated top quark pair production with a heavy boson: differential cross sections at NLO+NNLL accuracy
• NNLO QCD+NLO EW with MATRIX+OpenLoops: precise predictions for vector-boson pair production
• Top and Beauty synergies in SMEFT-fits at present and future colliders
• The Flavor of UV Physics
• Baryon Number, Lepton Number, and Operator Dimension in the SMEFT with Flavor Symmetries