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Draft: Muon standalone reconstruction and MatchVeloMuon

Adrian Casais Vidal requested to merge acasaisv-velomuon-opt into master

This MR introduces the following reconstruction algorithms:

  • FindMuonHits
  • FitMuon
  • MatchVeloMuon

The first two are devoted to reconstructing MuonTracks from the hits left at the muon stations. The first step looks for muon hits following some search windows and the second fits these hits to line both in ZX and ZY planes. At this stage it might be worth to merge this two algorithms since the best way to apply the clone killing involves using the same fit as it is used to obtain the slopes.

The last algorithm matches VELO tracks to MuonTracks using a chi2 type of metric, following the strategy started in !742 (merged).

The momentum resolution for this types of tracks is ~40% which also encapsulates to some exten the misID of the algorithm, looking at it from muonID algorithm.

Running on a Bs2MuMu sample these is the best performance obtained:

velo_tracks_muon validation:
Muon fraction in all MCPs:                                              56445/  3919389   0.01%
Muon fraction in MCPs to which a track(s) was matched:                   9367/   885491   0.01%
Correctly identified muons with isMuon:                                  4343/     9367  46.36%
Correctly identified muons from strange decays with isMuon:                 0/       27   0.00%
Correctly identified muons from B decays with isMuon:                    4286/     7926  54.08%
Tracks identified as muon with isMuon, but matched to non-muon MCP:      9672/   876124   1.10%
Ghost tracks identified as muon with isMuon:                              276/    33129   0.83%

fyi: @dcampora @gligorov

Edited by Andre Gunther

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