This muon finder is specialized on halo muons which are close to the beam pipe and hit both FCAL and RCAL. In principle the condensate based muon finder should find these halo muons too but for some cases the vetoing of candidates removes a beam pipe halo muon candidate.
This finder simply searches pairs of condensates, one in the FCAL ( ) and one in the RCAL ( ).
In this finder a candidate is vetoed if the event, when the candidate is removed, still passes the trigger conditions.
For each such pair MUFFIN calculates the candidate parameters precisely and then calls the user-supplied classification routine (see section 6.7.3) to positively identify the candidate.