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ntuple:ivf
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| ntuple:ivf [2013/09/20 14:48] – created clange | ntuple:ivf [2013/10/23 18:00] (current) – [Steps for MSSM Hbb analysis] clange | ||
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| ====== Inclusive Vertex Finder (IVF) ====== | ====== Inclusive Vertex Finder (IVF) ====== | ||
| - | need to check out two additional | + | The IVF will run out-of-the-box in CMSSW_5_3_11. If unsure, you can check out the following |
| - | '' | + | |
| + | cvs co -r V01-10-02 RecoBTag/SecondaryVertex | ||
| - | '' | + | To use the same approach as the VHbb group, one also needs to check out two additional packages: |
| - | '' | + | cvs co -d IVF/ |
| + | cvs co -d ZSV/ | ||
| + | | ||
| Last command needed to update really old IVF package config files to BuildFile.xml files. | Last command needed to update really old IVF package config files to BuildFile.xml files. | ||
| - | === Useful links === | + | ===== Work flow ===== |
| - | partly used in VHbb ntuples: | + | |
| - | *https:// | + | ==== General vertexing ==== |
| + | |||
| + | In order to get the IVF to work one has to perform inclusive vertexing by including [[https:// | ||
| + | |||
| + | process.load(' | ||
| + | |||
| + | The IVF runs on pre-selected vertices. After a coarse pre-clustering based on track distances and angles, vertices are reconstructed with the Adaptive fitter (outlier resistant, iterative procedure). This is done using the inclusive vertex finder from the [[https:// | ||
| + | |||
| + | * Source code: [[https:// | ||
| + | * Configuration file: [[https:// | ||
| + | |||
| + | These vertices are then merged depending on their significance in distance and the fraction of tracks they share (in particular vertices with a large fraction of common tracks are merged): | ||
| + | |||
| + | * Source code: [[https:// | ||
| + | * Configuration file: [[https:// | ||
| + | * using the standard config: | ||
| + | * maxFraction = 0.7 | ||
| + | * minSignificance = 2 | ||
| + | |||
| + | In the next step it is made sure that all tracks belong either to a secondary vertex or the primary vertex only optimising the assignment of tracks to vertices, followed by another vertex fit: | ||
| + | |||
| + | * [[https:// | ||
| + | * [[https:// | ||
| + | |||
| + | These refitted vertices are then again merged depending on their significance in distance and the fraction of tracks they share: | ||
| + | |||
| + | * Source code: [[https:// | ||
| + | * Configuration file: [[https:// | ||
| + | * config is overwritten by [[https:// | ||
| + | * maxFraction = 0.2 | ||
| + | * minSignificance = 10 | ||
| + | |||
| + | ==== b-vertex filtering ==== | ||
| + | |||
| + | The optimised vertices undergo a b-vertex filter: | ||
| + | |||
| + | * Source code: [[https:// | ||
| + | * Configuration file: [[https:// | ||
| + | |||
| + | ==== b to charm decay vertex merging ==== | ||
| + | |||
| + | The b-to-charm decay vertex merging attempts to identify B to D meson decays and merges them based on DeltaR, the vertex mass, the angle between them and the relative transverse momentum: | ||
| + | |||
| + | * Source code: [[https:// | ||
| + | * Configuration file: [[https:// | ||
| + | |||
| + | ===== Useful links ===== | ||
| + | partly used in VHbb ntuples: | ||
| + | * VHbb recipe: | ||
| * http:// | * http:// | ||
| Line 21: | Line 72: | ||
| twiki documentation: | twiki documentation: | ||
| - | * https:// | ||
| * official recipe: https:// | * official recipe: https:// | ||
| + | * combination with CSV tagger: https:// | ||
| CMSSW: | CMSSW: | ||
| - | * http:// | + | * https:// |
| + | * https:// | ||
| + | ===== Current errors ===== | ||
| + | |||
| + | none | ||
| + | |||
| + | |||
| + | ===== Steps for MSSM Hbb analysis === | ||
| + | |||
| + | | ||
| + | cvs co -r V01-10-02 RecoBTag/ | ||
| + | |||
| + | Replace '' | ||
| + | |||
| + | Check for details of information: | ||
| + | RecoBTag/SecondaryVertex/test/runIVFAnalyzer_cff.py | ||
| + | RecoBTag/SecondaryVertex/ | ||
| + | |||
| + | And voila: | ||
| + | |||
| + | The bdiscriminators below will be written to the jet collection in the PATtuple (default is all, see PatAlgos/ | ||
| + | jetBProbabilityBJetTags | ||
| + | jetProbabilityBJetTags | ||
| + | trackCountingHighPurBJetTags | ||
| + | trackCountingHighEffBJetTags | ||
| + | simpleSecondaryVertexHighEffBJetTags | ||
| + | simpleSecondaryVertexHighPurBJetTags | ||
| + | simpleInclusiveSecondaryVertexHighEffBJetTags | ||
| + | simpleInclusiveSecondaryVertexHighPurBJetTags | ||
| + | combinedSecondaryVertexBJetTags | ||
| + | combinedSecondaryVertexMVABJetTags | ||
| + | softMuonBJetTags | ||
| + | softMuonByPtBJetTags | ||
| + | softMuonByIP3dBJetTags | ||
| + | simpleSecondaryVertexNegativeHighEffBJetTags | ||
| + | simpleSecondaryVertexNegativeHighPurBJetTags | ||
| + | negativeTrackCountingHighEffJetTags | ||
| + | negativeTrackCountingHighPurJetTags | ||
| + | combinedInclusiveSecondaryVertexBJetTags | ||
| + | combinedMVABJetTags | ||
| + | doubleSecondaryVertexHighEffBJetTags | ||
ntuple/ivf.1379681304.txt.gz · Last modified: by clange
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