CMS DAS 2023 Tracking and Vertexing Short Exercise: Reference

Key Points

CMS Data Analysis School Tracking and Vertexing Short Exercise - The five basic track variables

  • The pre-selection of tracks to HighPurity in MiniAOD also affects the distribution of the track quality parameters.

  • All tracks are stored in the generalTracks collection in AOD.

  • In MiniAOD they are accessible in a less straightforward way (packedPFCandidates, lostTracks collection) and not all tracks are available!
CMS Data Analysis School Tracking and Vertexing Short Exercise - Tracks as particles

  • Tracks give us a direct handle on actual particles, thus they can easily be used to reconstruct other particles in the event
CMS Data Analysis School Tracking and Vertexing Short Exercise - Constructing vertices from tracks

  • Two or more tracks can be used to reconstruct their common point of origin, the vertex

  • Requiring two tracks to originate from the same vertex is a powerful tool to identify particles that decayed in the detector

  • The distribution of the proton proton interaction, the so-called interaction region, in the center of the CMS detector is an ellipse.
CMS Data Analysis School Tracking and Vertexing Short Exercise - Appendix

  • At this point it is extremely important to look at the documentation to find out moreabout the Tracking Physics Object Group (TRK POG) tasks.

Glossary

A reference document for information and explanations of acronyms and common terms in the CMS computing, grid-computing, detector, high energy physics and analysis environments.

The WorkBook Glossary is continually being updated with new and improved definitions of acronyms and concepts relating to the CERN, the CMS experiment, the LHC and GRID computing.