TrackMatcher.h(cxx)

Implementation of the MCH-MID matching algorithm.

Input / Output

It takes as input the lists or MCH ROFs, MCH tracks, MID ROFs and MID tracks. It returns the list of matched tracks with the data format TrackMCHMID.

Short description of the algorithm

The matching of each MCH track in each MCH ROF is done in 2 steps: 1) by time: finding all the MID ROFs (resolution = 1 BC) compatible with the MCH ROF (BC range) 2) by position: finding the MID track in those MID ROFs that is the most compatible (best matching chi2) with the MCH track. The chi2 must be lower than a threshold, defined via TrackMatcherParam (see below), to validate the matching.

TrackMatcherParam.h(cxx)

Definition of the sigma cut used to set the maximum matching chi2 = 4 * (sigma cut)^2. The factor 4 is because the matching is done on 4 track parameters (x, slopex, y, slopey).

The sigma cut is configurable via the command line or an INI or JSON configuration file (cf. workflow documentation).

Example of workflow

o2-muon-tracks-matcher-workflow --disable-mc

This takes as input the root files with MCH and MID tracks and ROFs and gives as ouput a root file with the matched tracks.

See the workflow documentation for more details about the track matcher workflow.