Jets and Heavy Flavor

• Mission Statement
  • The responsibilities of the Jets and Heavy Flavor working group are to evaluate the performance of the ePIC detector as it relates to jet and heavy flavor observables utilizing a set of performance and physics benchmarks. We also work on developing the analysis techniques and software tools needed to implement the benchmarks used in detector evaluation.
• Conveners
  • Olga Evdokimov (evdolga@uic.edu)
  • Rongrong Ma (marr@bnl.gov)
• Contact and administrative info
  • Mailing list: eic-projdet-jethf-l@lists.bnl.gov.
  • To subscribe, visit: https://lists.bnl.gov/mailman/listinfo/eic-projdet-jethf-l.
  • Indico: https://indico.bnl.gov/category/420/
  • Mattermost: https://chat.epic-eic.org/main/channels/phys-jets-hf
  • Wiki: https://wiki.bnl.gov/EPIC/index.php?title=JetsHF
• Meetings
  • Tuesdays at 11:30 am ET (bi-weekly)

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Simulations

• Repository for event generation: https://github.com/eic/HFsim
• D⁰ samples
  • e+p
    • 18x275
      • Each event contains at least one D⁰ that can decay through any channels
      • Location: SIDIS/D0_ABCONV/pythia8.306-1.0/18x275/hiDiv
    • 10x100
      • Each event contains at least one D⁰ that decays into π+K pair, and the decay daughters are within pseudorapidity of ±3.5
      • Location:
        • Q² > 1: SIDIS/D0_ABCONV/pythia8.306-1.1/10x100/q2_1/hiDiv
        • Q² > 100: SIDIS/D0_ABCONV/pythia8.306-1.1/10x100/q2_100/hiDiv
  • e+Au
    • Simulated with BeAGLE v1.03.01
    • Each event contains at least one D⁰ that decays into π+K pair
    • Location:
      • 10x100: [Simulation request submitted]
      • 5x41: [Simulation request submitted]
• L_c samples
  • e+p
    • 18x275
      • Each event contains at least one L_c that can decay through any channels
      • Location: SIDIS/Lambda_ABCONV/pythia8.306-1.0/18x275/hiDiv

Analysis macros

• Jet reader: https://github.com/eic/snippets/tree/main/JetsAndHF/jetReaderExamples
• D⁰ reconstruction based on Helix swimming: https://github.com/eic/snippets/tree/main/JetsAndHF/HF/D0_helix

EICrecon Jet Reconstruction Documentation

There are currently four jet collections in the default output of EICrecon:

• GeneratedJets, which are reconstructed from all final-state generator particles (particles from the GeneratedParticles collection) regardless of charge;
• GeneratedChargedJets, which are reconstructed from all charged final-state generator particles;
• ReconstructedJets, which are reconstructed from ReconstructedParticle objects (combinations of tracks and EMCal clusters produced by the MatchClusters algorithm);
• ReconstructedChargedJets, which are reconstructed from ReconstructedChargedParticle objects (i.e. tracks).

In all cases, the jets are formed via FastJet3 according the parameters listed in the table below, and are stored as edm4eic::ReconstructedParticle objects. As this data type was intended to describe particles rather than extended objects like jets, additional information like the jet area currently is not stored.

These parameters can be adjusted at runtime by the user, for example:

eicrecon \
  -Preco:ReconstructedChargedJets:jetAlgo=ee_genkt_algorithm \
  -Preco:ReconstructedChargedJets:rJet=0.8 \
  -Preco:ReconstructedChargedJets:pJet=-1.0 \
  <input edm4hep file>