# Jets calibration using events

## What

events with semileptonic decay of Ws.

## Where

http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/UserCode/Bicocca/HiggsAnalysis/TTBarAnalysis/

## How

How to prepare the environment for the analysis
cmsrel CMSSW_3_3_4
cd CMSSW_3_3_4/src/
cmsenv
cvs co -d HiggsAnalysis/TTBarAnalysis UserCode/Bicocca/HiggsAnalysis/TTBarAnalysis
cvs co -d PhysicsTools/NtupleUtils UserCode/Bicocca/PhysicsTools/NtupleUtils


cd HiggsAnalysis/TTBarAnalysis
scramv1 b


## Results

### Feasibility study: MC analysis

#### Calibration algorithms

Main idea: invariant mass of the reconstructed jets M.

Jet correction coefficients are defined by

where is the reconstructed momentum of the jet, is the correct momentum of the jet and k, the correction function, may depend on and of the jets. The purpose is to estimate the function
The function k has been "binned" in and rectangle in the plane. The width of these bins are determined by the number of events required by calibration algorithm (and then the number of events in a given integrated luminosity) and the accuracy on k that is required. It may be useful enable a dynamic binning of the function k according to the occupancy plot in the plane.

• MiB : Minuit Bare minimization
• kUpdate
• RUL3 : Random Update L3
• SL3: Squared L3
• RUFit : Random Update Fit
• SFit: Squared Fit

### Result: events and background

-- AndreaMassironi - 20-Jan-2010

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Topic revision: r2 - 2010-01-20 - AndreaMassironi

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