KFP Selector in online

Introduction

The merge request introduces an event selector based on the KFParticleFinder into cbm::algo namespace. The codebase consists from following classes:

• cbm::algo::kfp::KfpSelector: central class, defines input to the KFParticleFinder:

  • defines PID hypotheses for tracks in the reconstructed event
  • selects tracks (has proper PID hypothesis, enough number of hits, valid track parameters)
  • re-fits selected tracks with the given PID hypothesis, provides magnetic field coefficients and calculates chi value to primary vertex
  • configures KFParticleFinder and fills the trigger bitmap with found decays (the list of trigger decays is defined in the config)

• cbm::algo::kfp::TrackFitter: refits tracks for a given PID hypothesis

• cbm::algo::kfp::SelectorPid: performs PID in the input reconstructed event

• cbm::algo::kfp::PidParameters: defines parameters for PID in different detectors:

  • cbm::algo::kfp::TofParameters: parameters of m2_mean(p) and m2_sigma(p) in TOF for different charged particles
  • cbm::algo::kfp::StsParameters: decision tree to distinguish the He3/p and He4/d using energy loss in STS

• cbm::algo::KfpSelectorChain: steering class

TODO:

• Framework classes for the KFPF selector in cbm::algo
• PID for KFPF selector (STS and TOF)
• Track fitter for KFPF selector
• KFParticle converter
• KFPTopoReconsructor settings
• QA
• Integration to event reconstruction
• Testing (requires global tracking)