LCIO Track Model

What is a track?

A track is a collection of hits. Five parameters Momentum subtracks

A description of the track parameter in lcio can be found in. 1

The classes in LCIO related to tracking are:

• EVENT::Track The LCIO track class
• IMPL::TrackImpl Implementation of the LCIO track class
• EVENT::TrackState The LCIO TrackState class
• IMPL::TrackStateImpl Implementation of the LCIO TrackState class
• EVENT::TrackerHit A generic tracker hit to be used by pattern recognition
• IMPL::TrackerHitImpl Implementation of the generic tracker hit

A track in an electromagnetic field is usually thought to be a helix. However, this is not quite true due to the energy loss in the tracker.
Therefore, it is better to use more classes of parameters to describe a track.

A track state is the five parameters of a track. The Track state have serveral possible attributes.

• AtOther ??
• AtIP
• AtFirstHit
• AtLastHit
• AtCalorimeter
• AtVertex
• LastLocation ??

addTrack (Not used anymore) addTrackState