d0root version v6.2

• Change Log
• Instructions
• Results
• Known Problems
• dimuon B-tuples

Change Log

• Require >=2 Barrel+Fdisk SMT hits for primary vertex reconstruction (instead of >=2 Barrel SMT hits) - Ariel
• Fixed bug during PV finding iteration. - Ariel.
• New Muon quality definition 0 (d0root_analysis/objects/Muon.cpp) - Brad.
• Use muons with quality 0 and add muon quality information in B-tuple block PSI - Ariel.
• Comment out PHI vertex finding to speed up code. (line 691 of d0root_btag/analysis/BphysicsAnalysis.cpp)

Instructions (TMBTree)

//Create release area
//----------------------------------
newrel -t pXX.XX.XX mydir
cd mydir
d0setwa


//Install packages
//----------------------------------
addpkg d0root_analysis v00-06-21
addpkg d0root_btag v00-06-20

addpkg jetcorr v04-00-01
addpkg em_util v00-02-69                

//Generate TMBTreeClasses file
//----------------------------------
ln -s /d0dist/dist/releases/p13.06.01/tmb_analyze/macros/ macros
cp macros/MakeTMBTreeClasses_so.C .
root -q MakeTMBTreeClasses_so.C


//Compile jetcorr package
//----------------------------------
cd jetcorr
root -q MkRootLib.C 
cd ../

//Compile em_util package
//----------------------------------
gmake em_util.all EMUTIL_SHARED=1


//Link em_util package
//----------------------------------
cd d0root_btag
ln -s ../em_util em_util
cd ../


//Compile d0root packages
//----------------------------------
gmake d0root_analysis.all
gmake d0root_btag.all

Run analysis code

cd d0root_btag
root runBphysicsAnalysis_TMBtree.C

This command will create an instance of the class BphysicsAnalysis called "b". To see the list of available methods please look at d0root_btag/analysis/BphysicsAnalysis.h

To create a B-rtuple with information about J/Psi, Phi and B vertices, do:

    b->Process_diMuons("myOutputFileName", all_muons, muon_pt, muon_quality);

• "myOutputFileName" is the name of the output root tree.
• all_muons is a boolean variable indicating which tracks are going to be vertexed: true: all tracks; false only tracks matched to muons. By default all_muons = false.
• muon_pt is the minimum global muon pT in GeV/c, by default 1.5 GeV/c.
• muon_quality is the minimum quality, by default 0.

  The Muon quality definition is defined in d0root_analysis/objects/Muon.cpp:

• muon_quality = 0: nseg >= 1
• muon_quality = 1: 0 + centralrank==1
• muon_quality = 2: 1 + whits_a > 1 && whits_bc > 2 && shits_a > 0 && shits_bc > 0
• muon_quality = 3: 2 + nseg >= 3

To open the ROOT tuple and plot the invariant J/Psi invariant mass and lifetime do:

 root myOutputFileName.root
 tree->Draw("PSI.mass","PSI.mass>2 && PSI.mass<4")
 tree->Draw("PSI.lifetime","PSI.lifetime!=0 && PSI.mass>2.8 && PSI.mass<3.3")

Back to Vertex fitting and finding in ROOT page

Results

di-muon Invariant mass (opposite sign charged tracks)

di-muon Invariant mass (opposite sign charged tracks)

B -> JPsi K candidates

Known Problems

• Muo-Candidate is not implemented in this version. Muons are read from the standard Muon branch in the TMBTree.
• Muons are selected with the pT given by the muon object instead of its matched track.
• fdisk variable in block PSI was not filled properly.

dimuon B-tuples

/rooms/study/sch/sashitest_4/d0root_btag/

dimu_set1.root    
dimu_set2.root    
dimu_set3.root 
dimu_set4.root
dimu_set5.root
dimu_set6.root
dimu_set7.root
dimu_set8.root