D0ROOT version v9.3

• Change Log
• Instructions
• Links
• Known Problems

Change Log

p16 compatible

D0jetInfo objects

d0root_analysis/objects/D0JetInfo.cpp & d0root_analysis/objects/D0JetInfo.h
General updating of the D0JetInfo object.  Many additional classes to get at
heavy-flavor relevant information.  This class needs to be linked to the JES
package jetcorr.

d0root_tmbtree/src/TMBReadEvent.cpp
Removed much of the Monte Carlo information access methods.  Modified the
readJet class so as to include the jet energy scale information in the D0Jet
object.

d0root_btag/algorithms/D0JetInfoMaker.cpp &
d0root_btag/algorithms/D0JetInfoMaker.h
A new method, originally stuffed in TMBReadEvent.cpp.  It builds D0JetInfo
objects...highly-useful constructs which are designed for heavy-flavor
identification.

d0root_btag/analysis/DatabDiJet.cpp & d0root_btag/analysis/DatabDiJet.h
An updated version of the analysis aimed at finding two b-jets with a large
dijet mass.  Has examples for implementing the D0JetInfo object.

d0root_btag/runDatabDiJet.C
Updated method for running d0root_btag/analysis/DatabDiJet.cpp.

Instructions (TMBTree)

In order to run the script, you first need to create a new release area:

//Create release area
//----------------------------------

kinit

newrel -t p14.05.02 mydir
cd mydir
d0setwa
source Maked0root_v9.3.csh


Please read the comments in Maked0root_v9.csh script for different options.

Run analysis code

from mydir directory:
root d0root_btag/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, X state, and B->J/Psi K+ vertices, do:

    b->Process_diMuons("myOutputFileName", muon_pt, PVbeamConstraint);

• "myOutputFileName" is the name of the output root tree.
• muon_pt is the minimum global muon pT in GeV/c, by default 1.5 GeV/c.
• PVbeamConstraint is set to 0 (false) by default.
• All Loose muons are considered

In order to open the ROOT-tuple and plot the 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.mass>2.8 && PSI.mass<3.3")

Please send questions/comments/improvements/ or report problems to the

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