My Validation of HCAL calibration with DiJets


The procedure of calibration with Isolated tracks is described on CMS.StartUp page.

Once HCAL RecHits are calibrated we want to make sure that the calibration works well.

Parameters of Isolated Tracks (adjusted through

Values in this table were used to produce all plots in this analysis.

parameter value description
associationConeSize cms.double(0.5) A cone around the TrackAssosiator entrance point.
energyECALmip cms.double(500.0) MIP cut. Not applied here. Can be applied later.
MinNTrackHitsBarrel cms.int32(13) Quality of track reconstruction
MinNTECHitsEndcap cms.int32(11) Quality of track reconstruction
energyMinIso cms.double(5.0) MinPt cut for tracks
energyMaxIso cms.double(1000.0) MaxPt cut for tracks
maxPNear cms.double(2.0) Isolation parameter. No tracks with Pt > 2 GeV around.
AxB cms.string("3x3") Calibration claster (5x5 is available)

Code: Sandbox.UserCode/AndreyPozdnyakov/MyValidation




Tracks energy spectra: tracker vs HCAL (before and after calibration) (MIP events only).

10 <span class=GeV tracks" /> 50 <span class=GeV tracks" /> 100 <span class=GeV tracks" /> 300 <span class=GeV tracks" />

Most following plots are shown in the same manner:
            10 GeV                      50 GeV

            100 GeV                    300 GeV

Response in HBarrel (MIPs).

Run my code

Code on CVS: Sandbox.UserCode/AndreyPozdnyakov

# Set up:
cmsrel CMSSW_2_2_6
cd CMSSW_2_2_6/src
# Get the code from CVS:
cvs co UserCode/AndreyPozdnyakov
cd UserCode/AndreyPozdnyakov
scramv1 b
cd work
cmsRun xxxxx

Once it's done you will find ValidFile_XX.root file. In order to plot all histograms run plot.C script. Before doing that you have to change it. Change the path were to produce .png files: TString imgpath("~/public/html/validation/");. Then run:

root -b -q plot.C

Run on batch (CAF)

See work/b

Relevant links and stuff.

More plots can be found here:

See also:

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-- AndreyPozdnyakov - 30 Mar 2009

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