CutFlow < Main

---+ B-Tagging cut flow
|  Algorithm/Algtool  |  Task  |  Cuts  |
|  !BJetBuilder  | retrieves Jet/ParticleJet collection and !TrackParticle container. Calls tool for !TrackParticle - Jet association. \
Calls !BTagTool for *every* Jet in the input collection | cuts on the jet: !PtMin = 10*GeV, !EtaMax   = 2.5, !NbTrackMin = 1. \
*but these cuts are bypassed by default* with !TagJetIfNotSelected  = True  |
|  !BTagTool  | sets general !JetTag datamembers (4 mom, aso.). Calls truth matching tool (if no truth match possible, it is set to "N/A". \
retrieves primary vertex container.  | If there is *no* primary vertex *no* tag tool is called. !BTagTool returns SC::Success to !BJetBuilder.  |
|  !TagTools  | each tool does a dedicated tag (lifetime, secvtx)  | Loops over the !TrackParticles in the Jet and selects them: pt > 1.GeV, d0 to primary vertex < 1 mm, z0 to pri vtx < 1.5 mm, precision hits (pixel + sct) >= 9, Pixel hits >= 2, B-layer hits >= 1.  |
||  !SecVtxTool special cuts  | also cut on a0/sig(a0) > 1. and in the vertex fit: chi2 per track < 4. and distance between \
primary and secondary vertex > 0.2 mm  |

---++ Conclusion: when is a Jet not tagged
|  Algorithm/Algtool  |  Stops tagging  |
|  !BJetBuilder  | *never*, all jets are passed through unless !TagJetIfNotSelected is set to *False* via job options |
|  !BTagTool  | stops if there is *no primary vertex* in the event. No tag at all will be called. The info map of the !JetTag object has size 1 and will contain the !TruthInfo object only.  |
|  !LifetimeTag  | stops if a Jet has less than 2 good tracks, no info object will be appended to the !JetTag object  |
|  !SecVtxTag  | stops if a Jet has less than 2 good tracks, no info object will be appended to the !JetTag object \
*in addition* does not give a usefull tag if no secondary vertex could be fitted. *however* in this case a info object will \
be given to the !JetTag object which also will be used for tagging ... *Advice:* when reading the sec vtx info part of the !JetTag \
check for the variable !SecVtxInfo::fitType() not equal !SecVtxInfo::NoFit  |

-- Main.DerSchrecklicheSven - 23 May 2005

This topic: Main > DerSchrecklicheSven > AthenaStuff > CutFlow
Topic revision: r2 - 2005-05-30 - AndreasWildauer

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