Analysis of the channel H → WW → lν_l jj

Technical aspects

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setenv SCRAM_ARCH slc5_amd64_gcc462
cmsrel CMSSW_5_2_5
cd CMSSW_5_2_5/src
cmsenv
cvs co -d PhysicsTools/NtupleUtils UserCode/Bicocca/PhysicsTools/NtupleUtils
cvs co -d PhysicsTools/MiBiCommonPAT UserCode/DiMatteo/MiBiCommonPAT
cvs co -r V00-02-05 -d CMGTools/External UserCode/CMG/CMGTools/External
scramv1 b -j9

export CVS_RSH=ssh
export CVSROOT=:ext:USERNAME@cmscvs.cern.ch:/cvs_server/repositories/CMSSW
cvs co -d NtuplePackage UserCode/abenagli/Fall10/NtuplePackage
cvs co -d KinFitter UserCode/abenagli/Fall10/KinFitter
cvs co -d VBFAnalysisPackage UserCode/abenagli/Fall10/VBFAnalysisPackage

cd NtuplePackage
source scripts/setup.(c)sh
make

cd KinFitter
source scripts/setup.(c)sh
make

cd VBFAnalysisPackage
source scripts/setup.(c)sh
make
make exe

Analysis @ 7 TeV

The current version of the analysis is based on the official Fall10 MonteCarlo production.
For signal samples, the cross-section and branching-ratio values are taken from the LHC Higgs Cross Section Working Group

Cross-section values for background samples are taken from ...

VBF Preselection

A first preselection of the events is performed on signal and background samples. This preselection is intended to be in common with all VBF channels. The event requirements are as follow:

• At least one lepton (e/mu) with pT > 10 GeV/c, loosely isolated Sum pT trakcs / pT < 0.5 and, if electron, passing the RobustLoose eID
• At least two jets with eT > 15 GeV (if not corrected) or eT > 30 GeV (if L2L3 corrected)

Events passing these first requirements are saved in a root ntuple. Here the instructions:

INSTRUCTIONS FOR SIGNAL SAMPLES:

Go to folder HiggsAnalysis/VBFHiggsToVV/scripts/signal.
Change parameters in file params_lxbatch.CFG according to your needs.
The production of the ntuples is sent to the CERN batch system typing perl launchJobs_lxbatch.pl params_lxbatch.CFG.

INSTRUCTIONS FOR BACKGROUND SAMPLES:

Since background samples are available on the grid, crab is used to launch the ntuple production. Go to folder HiggsAnalysis/VBFHiggsToVV/scripts/background.
Specify the samples you want to run over in file multicrab.cfg and edit the user-dependent parameters in file crab_background.cfg.
Launch the production of ntuples typing multicrab -create -submit -cfg multicrab.cfg

LOCATION:

In both cases, ntuples are named VBFPreselection_%d.root and are stored on hercules, in folder

/gwteray/users/benaglia/NTUPLES/Fall10/

VBFHiggsToWWTolnujjPreselection

A second, more stringent preselection of the events is performed on signal and background samples. This preselection is intended to be specific for the VBF H -> WW -> lnu jj channel. The event requirements are as follow:

• at least 1 lepton (e/mu) with pT > 10 GeV/c, loosely isolated Sum pT trakcs / pT < 0.5 and, if electron, passing the RobustLoose eID
• at least 4 jets with eT > 15 GeV (if not corrected) or eT > 30 GeV (if L2L3 corrected)
• at least a couple of jets with Deta > 1.5 and mJJ > 250 GeV/c2

INSTRUCTIONS

This second preselection is run outside CMSSW. Just go to the base directory of the VBFAnalysisPackage and set the necessary environement variables by typing source scripts/setup.(c)sh.

Create the list of samples to run over by typing the command rfdir $CASTOR/NTUPLES/VBF/Summer09_10TeV | awk '{print $9}' > data/listOfSamples.txt. A file called listOfSamples.txt is created under data/ and contains the list of the names of all castor folders.

To launch the ntuple production, go to folder scripts/VBFHiggsToWWTolnujjPreselection, modify the file params_lxbatch.CFG as required and then perl launchJobs_lxbatch.pl params_lxbathc.CFG

In both cases, ntuples are named VBFHiggsToWWTolnujjPreselection_%d.root and are stored on castor, in folder

/castor/cern.ch/user/a/abenagli/NTUPLES/VBF/Summer09_10TeV/sample_name

Note that, at this stage, ntuple size should be small enough to allow for a disk copy of all samples. To automatically launch the copy of the ntuples in /tmp/abenagli just do perl launchCopy.pl params_lxbatch.CFG.

-- AndreaBenaglia - 21-Nov-2009