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Tutorial feb2012 [message #13464] Thu, 10 May 2012 11:01 Go to previous message
Dmitry Khaneft is currently offline  Dmitry Khaneft
Messages: 75
Registered: January 2009
continuous participant
From: *kph.uni-mainz.de
Dear all,

I try to follow tutorial available at feb12.

I slightly modified it for my needsand try to plot some simple distributions but I can't see an effect of applying different PID criteria.

For example: All, VeryLoose, Loose, Tight, VeryTight give same results.

Here is a part of my code.

// *** TCandLists for the analysis
TCandList eplus, eminus;

...

while (theAnalysis->GetEvent() && i++<nevts){
    if ((i%1000)==0) cout << "Number of events analysed: " << i << endl;

    // *** Select with no PID info ('All'); type and mass are set
    theAnalysis->FillList(eplus, "ElectronTightPlus");
    //theAnalysis->FillList(eplus, "ElectronTightPlus","PidAlgoEmcBayes");
    theAnalysis->FillList(eminus, "ElectronTightPlus");
    //theAnalysis->FillList(eminus, "ElectronTightMinus","PidAlgoEmcBayes");

    // ELECTRONS ***
    for (Int_t j=0;j<eminus.GetLength();++j){
      // Fill momentum of reconstructed particles
      hP->Fill(eminus[j].GetMomentum().Mag());
      // Fill energy of reconstructed particles
      hE->Fill(eminus[j].Energy());
      // Fill momentum vs E/p
      hEP->Fill(eminus[j].GetMomentum().Mag(), eminus[j].Energy()/eminus[j].GetMomentum().Mag());
      // *** CM frame *** //
      // boost from LAB to CM
      lv_charged_cm.SetVect(eminus[j].GetMomentum());
      lv_charged_cm.SetE(TMath::Sqrt(cElectronMass*cElectronMass + eminus[j].GetMomentum().Mag()*eminus[j].GetMomentum().Mag()));
      lv_charged_cm.Boost(-(lv_bar_beam + lv_p_target).BoostVector()); 

      hCosTheta_N_CM->Fill(lv_charged_cm.CosTheta());
    }
    for (Int_t j=0;j<eplus.GetLength();++j){
      // Fill momentum of reconstructed particles
      hP->Fill(eplus[j].GetMomentum().Mag());
      // Fill energy of reconstructed particles
      hE->Fill(eplus[j].Energy());
      // Fill momentum vs E/p
      hEP->Fill(eplus[j].GetMomentum().Mag(), eplus[j].Energy()/eplus[j].GetMomentum().Mag());
      // *** CM frame *** //
      // boost from LAB to CM
      lv_charged_cm.SetVect(eplus[j].GetMomentum());
      lv_charged_cm.SetE(TMath::Sqrt(cElectronMass*cElectronMass + eplus[j].GetMomentum().Mag()*eplus[j].GetMomentum().Mag()));
      lv_charged_cm.Boost(-(lv_bar_beam + lv_p_target).BoostVector()); 

      hCosTheta_P_CM->Fill(lv_charged_cm.CosTheta());
    }
  }


In addition histograms filled with energy and momentum are the same. Using "PidAlgoEmcBayes" also gives no effect.

Is it suppose to be like this or I do something wrong?

P.S. I used trunk 15407 instead of 14709 because later couldn't be compiled.

Cheers,
Dmitry
 
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