MCMATCH : Matching of a Monte Carlo truth track with a reconstructed track

The routine MCMATCH checks if a ``truth" track at the FKIN (generator) level is reconstructed or not after GALEPH and JULIA. See the note of D.Brown ALEPH 94-135 (PHYSIC 94-118) for more details.

IMCTRU

Input argument : Alpha index of a ``truth" track (between KFMCT and KLMCT)

IRECTR

Alpha index of the matching reconstructed charged track (between KFCHT and KLCHT)

= 0 if no matching found

IFLAG

Flag describing the matching status:

• -3 No match (lost ``truth" track)
• -2 Track decays before making hits
• -1 No well matching track
• 0 MC track double counted
• 1 Normal good match from primary vertex
• 2 Normal good match from secondary vertex
• 2 Normal good match from V0 decay
• 4 Kink fit as 2 tracks
• 5 Kink fit as 1 track
• 6 Normal good match from material interaction