Top quark pair production with fully hadronic final states at the LHC

Description

This public dataset was used to develop HyPER (Hypergraph for Particle Event Reconstruction). HyPER uses blended graph-hypergraph representation learning to reconstruct short-lived particles produced at the LHC. Production Software Matrix Elements (ME) and NLO Matching: MadGraph5_aMC@NLO (v2.9.16 LTS) at \(\sqrt{s}=13\) TeV. Parton Distribution Function (PDF): NNPDF3.0nlo from LHAPDF6 (v6.3.0). Parton Shower: PYTHIA8 (v8.306). Detector: Delphes (v3.5.0), ATLAS detector geometry. Jet Reconstruction: Fastjet (v3.4.0), anti-\(k_t\) algorithm with \(R=0.4\) Jet truth matching Jets are matched to their originating particles using the \(\Delta R\) truth matching scheme. If the angular distance between a particle and its nearest jet satisfies \(\Delta R < 0.4\), then the jet is matched to the particle. We use the following integer labels in jet_truthmatch: 0, 1, 2, 3, 4, 5, 6 ("not matched", b1, W1q1, W1q2, b2, W2q1, W2q2). Event selections Events contain at least 6 jets, of which 2 or more are b-tagged. At least one identifiable W boson (two jets are matched to the decays of a W boson). Reconstructed jets have a minimum \(p_T\) of 25 GeV and an absolute pseudorapidity \(|\eta|<2.5\). Dataset Information   Training Validation Testing Size-reduced Dataset name ttbar_train.root ttbar_val.root ttbar_test.root ttbar_reduced.root Internal ID 762705-{0-53} 762705-{54-56} 762705-{57-59} Sampled from ttbar_train.root Number of events* 54M 3M 3M 3M Pass selections 7,921,299 439,692 440,069 439,598 Both tops matched 2,116,231 117,487 116,960 117,812 Max number of jets 20 20 18 20 *Only events that have passed selections are saved. Dataset structure Events are saved in ROOT files. They have the following structure: - Delphes ---- njet // Int; Number or jets ---- nbTagged // Int; Number of b-tagged jets ---- allMatchedEvent // Int; Event is fully matched (1 or 0) ---- leastOneMatchedW // Int; Event contains at least one matched W (1 or 0) ---- jet_pt // vector; Transverse momentum of jets ---- jet_eta // vector; Pseudo-rapidity of jets ---- jet_phi // vector; Azimuthal angle of jets ---- jet_e // vector; Energy of jets ---- jet_m // vector; Invariant mass of jets ---- jet_bTag // vector; B-tagging status of jets---- jet_truthmatch // vector; DeltaR jet truth matching results ---- particle_pid // vector; Particle PDGID ---- particle_pt // vector; Transverse momentum of particles ---- particle_eta // vector; Pseudo-rapidity of particles ---- particle_phi // vector; Azimuthal angle of particles ---- particle_m // vector; Invariant mass of particles jet_* branches containing information on the final-state jets. Information on short-lived particles is obtained from generator history are saved to particle_* branches.  

Resources

Name Format Description Link
0 http://data.europa.eu/88u/dataset/oai-zenodo-org-10653837
0 http://data.europa.eu/88u/dataset/oai-zenodo-org-10653837
0 http://data.europa.eu/88u/dataset/oai-zenodo-org-10653837
0 http://data.europa.eu/88u/dataset/oai-zenodo-org-10653837
0 http://data.europa.eu/88u/dataset/oai-zenodo-org-10653837

Tags

  • top-quark
  • ml
  • particle-physics
  • hep
  • lhc

Topics

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