StHbtMaker/CorrFctn/MinvCorrFctnM_vs_Pt.cxx

/***************************************************************************
 *
 * $Id: MinvCorrFctnM_vs_Pt.cxx,v 1.1 2000/03/16 21:16:26 laue Exp $
 *
 * Author: Frank Laue, Ohio State, laue@mps.ohio-state.edu
 ***************************************************************************
 *
 * Description: part of STAR HBT Framework: StHbtMaker package
 *     A simple invariant-mass correlation function
 *
 ***************************************************************************
 *
 * $Log: MinvCorrFctnM_vs_Pt.cxx,v $
 * Revision 1.1  2000/03/16 21:16:26  laue
 * Correlation function added
 *
 * Revision 1.2  1999/07/06 22:33:19  lisa
 * Adjusted all to work in pro and new - dev itself is broken
 *
 * Revision 1.1.1.1  1999/06/29 16:02:57  lisa
 * Installation of StHbtMaker
 *
 **************************************************************************/


#include "StHbtMaker/CorrFctn/MinvCorrFctnM_vs_Pt.h"
//#include "StHbtMaker/Infrastructure/StHbtHisto.hh"
#include <cstdio>

#ifdef __ROOT__
ClassImp(MinvCorrFctnM_vs_Pt)
#endif

//____________________________
MinvCorrFctnM_vs_Pt::MinvCorrFctnM_vs_Pt(char* title, 
                                         const int& nbins1, const float& MinvLo1, const float& MinvHi1,
                                         const int& nbins2, const float& MinvLo2, const float& MinvHi2){
  // set up numerator
  char theTitle[100];
  char* TitNum = "MinvCorrFctnM_vs_Pt_Num";
  sprintf(theTitle,"Num %s",title);
  mNumerator = new StHbt2DHisto(TitNum,theTitle,nbins1,MinvLo1,MinvHi1,nbins2,MinvLo2,MinvHi2);
  // set up denominator
  char* TitDen = "MinvCorrFctnM_vs_Pt_Den";
  sprintf(theTitle,"Den %s",title);
  mDenominator = new StHbt2DHisto(TitDen,theTitle,nbins1,MinvLo1,MinvHi1,nbins2,MinvLo2,MinvHi2);
  // set up difference
  char* TitDif = "MinvCorrFctnM_vs_Pt_Dif";
  sprintf(theTitle,"Dif %s",title);
  mDifference = new StHbt2DHisto(TitDif,theTitle,nbins1,MinvLo1,MinvHi1,nbins2,MinvLo2,MinvHi2);
  // this next bit is unfortunately needed so that we can have many histos of same "title"
  // it is neccessary if we typedef StHbt1DHisto to TH1d (which we do)
  mNumerator->SetDirectory(0);
  mDenominator->SetDirectory(0);
  mDifference->SetDirectory(0);
}

//____________________________
MinvCorrFctnM_vs_Pt::~MinvCorrFctnM_vs_Pt(){
  delete mNumerator;
  delete mDenominator;
  delete mDifference;
}
//_________________________
void MinvCorrFctnM_vs_Pt::Finish(){
  // here is where we should normalize, fit, etc...
  // we should NOT Draw() the histos (as I had done it below),
  // since we want to insulate ourselves from root at this level
  // of the code.  Do it instead at root command line with browser.
  //  mNumerator->Draw();
  //  mDenominator->Draw();
  //mRatio->Draw();
  double NumeratorInt = mNumerator->Integral();
  double DenominatorInt = mDenominator->Integral();
  mDifference->Add(mNumerator,mDenominator,1.0,-1*NumeratorInt/DenominatorInt);

}

//____________________________
StHbtString MinvCorrFctnM_vs_Pt::Report(){
  string stemp = "Minv Correlation Function Report:\n";
  char ctemp[100];
  sprintf(ctemp,"Number of entries in numerator:\t%E\n",mNumerator->GetEntries());
  stemp += ctemp;
  sprintf(ctemp,"Number of entries in denominator:\t%E\n",mDenominator->GetEntries());
  stemp += ctemp;
  sprintf(ctemp,"Number of entries in difference:\t%E\n",mDifference->GetEntries());
  stemp += ctemp;
  StHbtString returnThis = stemp;
  return returnThis;
}
//____________________________
void MinvCorrFctnM_vs_Pt::AddRealPair(const StHbtPair* pair){
  mNumerator->Fill( pair->mInv(), pair->fourMomentumSum().vect().perp(), 1.);
}
//____________________________
void MinvCorrFctnM_vs_Pt::AddMixedPair(const StHbtPair* pair){
  mDenominator->Fill( pair->mInv(), pair->fourMomentumSum().vect().perp(), 1.);
}

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