UZH

Physik-Institut

CMS Wiki Pages

User Tools

Site Tools

Trace:
ntuple:ivf

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
ntuple:ivf [2013/09/20 15:22] – clangentuple:ivf [2013/10/23 18:00] (current) – [Steps for MSSM Hbb analysis] clange
Line 1: Line 1:
 ====== Inclusive Vertex Finder (IVF) ====== ====== Inclusive Vertex Finder (IVF) ======
  
-need to check out two additional packages:+The IVF will run out-of-the-box in CMSSW_5_3_11. If unsure, you can check out the following two packages: 
 + 
 +  cvs co -r V02-02-06 RecoVertex/AdaptiveVertexFinder 
 +  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/BCandidateProducer UserCode/BbCorrelation/CMSSW/BAnalysis/BCandidateProducer   cvs co -d IVF/BCandidateProducer UserCode/BbCorrelation/CMSSW/BAnalysis/BCandidateProducer
Line 9: Line 14:
 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://twiki.cern.ch/twiki/bin/viewauth/CMS/VHbbAnalysisNewCode#NtupleV42_CMSSW_5_3_3_patch2+==== General vertexing ==== 
 + 
 +In order to get the IVF to work one has to perform inclusive vertexing by including [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/python/inclusiveVertexing_cff.py|inclusiveVertexing_cff.py]]: 
 + 
 +  process.load('RecoVertex/AdaptiveVertexFinder/inclusiveVertexing_cff') 
 + 
 +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://github.com/cms-sw/cmssw/tree/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder|adaptive vertex finder package]]: 
 + 
 +  * Source code: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/plugins/InclusiveVertexFinder.cc|InclusiveVertexFinder.cc]] 
 +  * Configuration file: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/python/inclusiveVertexFinder_cfi.py|inclusiveVertexFinder_cfi.py]] 
 + 
 +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://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/plugins/VertexMerger.cc|VertexMerger.cc]] 
 +  * Configuration file: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/python/vertexMerger_cfi.py|vertexMerger_cfi.py]] 
 +  * 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://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/plugins/TrackVertexArbitrator.cc|TrackVertexArbitrator.cc]] 
 +  * [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/python/trackVertexArbitrator_cfi.py|trackVertexArbitrator_cfi.py]] 
 + 
 +These refitted vertices are then again merged depending on their significance in distance and the fraction of tracks they share: 
 + 
 +  * Source code: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/plugins/VertexMerger.cc|VertexMerger.cc]] 
 +  * Configuration file: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/python/vertexMerger_cfi.py|vertexMerger_cfi.py]] 
 +  * config is overwritten by [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/python/inclusiveVertexing_cff.py|inclusiveVertexing_cff.py]] to: 
 +    * maxFraction = 0.2 
 +    * minSignificance = 10 
 + 
 +==== b-vertex filtering ==== 
 + 
 +The optimised vertices undergo a b-vertex filter: 
 + 
 +  * Source code: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoBTag/SecondaryVertex/plugins/BVertexFilter.cc|BVertexFilter.cc]] 
 +  * Configuration file: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoBTag/SecondaryVertex/python/bVertexFilter_cfi.py|bVertexFilter_cfi.py]] 
 + 
 +==== 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://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoBTag/SecondaryVertex/plugins/BtoCharmDecayVertexMerger.cc|BtoCharmDecayVertexMerger.cc]] 
 +  * Configuration file: [[https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoBTag/SecondaryVertex/python/bToCharmDecayVertexMerger_cfi.py|bToCharmDecayVertexMerger_cfi.py]] 
 + 
 +===== Useful links ===== 
 +partly used in VHbb ntuples: 
 +  * VHbb recipe: https://twiki.cern.ch/twiki/bin/viewauth/CMS/VHbbAnalysisNewCode#NtupleV42_CMSSW_5_3_3_patch2
   * http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/UserCode/VHbbAnalysis/HbbAnalyzer/test/patData.py?revision=1.9&view=markup   * http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/UserCode/VHbbAnalysis/HbbAnalyzer/test/patData.py?revision=1.9&view=markup
  
Line 19: Line 72:
  
 twiki documentation: twiki documentation:
-  * https://twiki.cern.ch/twiki/bin/viewauth/CMS/CSVIVF 
   * official recipe: https://twiki.cern.ch/twiki/bin/viewauth/CMS/InclusiveVertexFinderRecipes   * official recipe: https://twiki.cern.ch/twiki/bin/viewauth/CMS/InclusiveVertexFinderRecipes
 +  * combination with CSV tagger: https://twiki.cern.ch/twiki/bin/viewauth/CMS/CSVIVF
  
 CMSSW: CMSSW:
-  * http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/CMSSW/RecoVertex/AdaptiveVertexFinder/+  * https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoVertex/AdaptiveVertexFinder/ 
 +  * https://github.com/cms-sw/cmssw/blob/CMSSW_5_3_X/RecoBTag/SecondaryVertex/ 
 +===== Current errors ===== 
 + 
 +none 
 + 
 + 
 +===== Steps for MSSM Hbb analysis === 
 + 
 +  cvs co -r V02-02-06 RecoVertex/AdaptiveVertexFinder 
 +  cvs co -r V01-10-02 RecoBTag/SecondaryVertex 
 +   
 +Replace ''PhysicsTools/PatAlgos/python/tools/jetTools.py'' by this [[https://twiki.cern.ch/twiki/pub/CMS/InclusiveVertexFinderRecipes/jetTools.py.txt|version]]. 
 + 
 +Check for details of information: 
 +  RecoBTag/SecondaryVertex/test/runIVFAnalyzer_cff.py 
 +  RecoBTag/SecondaryVertex/test/IVFAnalyzer.cc 
 +   
 +And voila: 
 + 
 +  The bdiscriminators below will be written to the jet collection in the PATtuple (default is all, see PatAlgos/PhysicsTools/python/tools/jetTools.py) 
 +  jetBProbabilityBJetTags 
 +  jetProbabilityBJetTags 
 +  trackCountingHighPurBJetTags 
 +  trackCountingHighEffBJetTags 
 +  simpleSecondaryVertexHighEffBJetTags 
 +  simpleSecondaryVertexHighPurBJetTags 
 +  simpleInclusiveSecondaryVertexHighEffBJetTags 
 +  simpleInclusiveSecondaryVertexHighPurBJetTags 
 +  combinedSecondaryVertexBJetTags 
 +  combinedSecondaryVertexMVABJetTags 
 +  softMuonBJetTags 
 +  softMuonByPtBJetTags 
 +  softMuonByIP3dBJetTags 
 +  simpleSecondaryVertexNegativeHighEffBJetTags 
 +  simpleSecondaryVertexNegativeHighPurBJetTags 
 +  negativeTrackCountingHighEffJetTags 
 +  negativeTrackCountingHighPurJetTags 
 +  combinedInclusiveSecondaryVertexBJetTags 
 +  combinedMVABJetTags 
 +  doubleSecondaryVertexHighEffBJetTags 
ntuple/ivf.1379683343.txt.gz · Last modified: 2013/09/20 15:22 by clange

Page Tools

Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
CC Attribution-Share Alike 4.0 International Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki