Event Data Model

Data Driven Workflow Engine


From Roberto(feels like reversed?):

f-tag is used to generate ESD(which is trashed), at t0 and AOD.

r-tag is the one for the daod (not entirely sure)

Run2 EDM

xAOD::IParticle - xAOD::AuxContainerBase

Pure-virtual base class for all particles.

  • All objects of particle type(e, mu, gamma, jet, etc)
  • clustered energy deposits.
  • reconstructed charged particle tracks.
  • e.g. xAOD::Muon_v1 is interfaced with xAOD::Muon

All particle objects are stored in "containers"

  • like a vector of pointers to xAOD objects.

Objects can have references ("ElementLinks") to other objects

  • Electron links to xAOD::TrackParticle or xAOD::CaloCluster.

xAOD::TrackParticle (AOD)

Created from Trk::Track (ESD)
Can hold track parameters at multiple positions, but usually only defining parameters.

xAOD::Egamma - xAOD::EgammaAuxContainer

Egamma Twiki

Helper functions:

xAOD::Electron - xAOD::ElectronAuxContainer

Each electron has a “link” to its cluster and track(CaloClusterContainer, TrackParticleContainer).

  • An electron holds its 4-mom, shower-shape variables, isolation variables, ...
  • A cluster has a 4-mom, sampling and moment details, and links to cells, ...
  • A track has a 4-mom, hits details, covariance matrix, ...
Helper functions:

xAOD::Photon - xAOD::PhotonAuxContainer

For Photons, there is a “VertexContainer” instead of the TrackParticle container.

Helper functions:


xAOD Muon Twiki


Muon Selection Tool

Isolation Selection Tool


MCP guide

cvmfs code: /cvmfs/atlas.cern.ch/repo/sw/database/GroupData/MuonEfficiencyCorrections/170916_Rel21PreRec/

MCP Derivation Twiki


How To Read xAOD

Can be accessed by vanilla ROOT(just usual version of root) interactively. Just to check mistakes.

Additional info about how to read xAOD

xAOD EDM Twiki

xAOD Analysis in CMake

-- RongkunWang - 2017-09-26

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Topic revision: r5 - 2019-05-03 - RongkunWang
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