MVA Tools

Introduction

This page collects information relevant for the study of MVA inside CMS software

Starting Ntuples

We can start our studies /optimization/comparison from the ntuples located at

rfdir /castor/cern.ch/user/d/degrutto/2011/MVA/

you'll find tar ball there to untar. The /test folder contains ntuples and TMVA macros already pointing to them. The scripts are TMVAClassification_X.C pointing to X*.root (X=ZH,WH,ZinvH). Here then we have three set of analyses we can performL

  • ZH analyses: low mass Higgs decaying into b-b pairs in association with a Z decay into leptons
  • WH analyses: low mass Higgs decaying into b-b pairs in association with a W decay into leptons
  • ZinvH analyses: low mass Higgs decaying into b-b pairs in association with a Z decay into neutrinos

We can maybe choose one of the three or all of them.

The variables name in the ntuples should be self explanatory: just a reminder

always require Zpt (Wpt, MetEt ) > 150, because the Zjets background has been   generated with that requirement: this a a boost Higgs analyses! 

Looking for example at the file TMVA/test/WHWH-115.root we get the following variables:

hjjMass --> mass of the jet-jet pair (hopefully around 115 GeV ;) )
hjjPt --> pt of the jet-jet pair 
WenPt --> pt of the W-->e + nu, please require always pt>150 
WenPt --> pt of the W-->mu + nu, please require always pt>150
jcsv1 --> CSV tag of the leading jet (hopefully >~ 0.5)
jcsv2 --> CSV tag of the second jet (hopefully >~ 0.5)
jjdr --> deltaR beetween the two jets
hjjWendPhi --> deltaPhi between the H and W candidate (hopefully back to back!)
.......................

The list of samples used and their correspondent lumi is given in the figure attached samples.png

Documentation

Responsible: MicheleDegruttola

-- MicheleDegruttola - 12-May-2011

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PNGpng samples.png r1 manage 1053.5 K 2011-05-12 - 11:51 MicheleDegruttola samples
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