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// $Id: PDFProducerMod.cc,v 1.2 2009/12/06 14:59:28 ceballos Exp $
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#include "MitPhysics/Mods/interface/PDFProducerMod.h"
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#include "MitCommon/MathTools/interface/MathUtils.h"
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#include "MitAna/DataTree/interface/MCEventInfo.h"
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#include "MitAna/DataTree/interface/ParticleCol.h"
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#include "MitPhysics/Init/interface/ModNames.h"
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#include <TH1D.h>
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#include <TH2D.h>
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#include <TSystem.h>
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#include "LHAPDF/LHAPDF.h"
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using namespace mithep;
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ClassImp(mithep::PDFProducerMod)
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//--------------------------------------------------------------------------------------------------
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PDFProducerMod::PDFProducerMod(const char *name, const char *title) :
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BaseMod(name,title),
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fPrintDebug(kFALSE),
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fMCEvInfoName(Names::gkMCEvtInfoBrn),
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fPDFName("cteq65.LHgrid"),
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fRunPDF(kFALSE),
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fMCEventInfo(0)
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{
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// Constructor
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}
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//--------------------------------------------------------------------------------------------------
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void PDFProducerMod::Process()
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{
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// Process entries of the tree.
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LoadBranch(fMCEvInfoName);
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Double_t Q = fMCEventInfo->Scale();
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Int_t id1 = fMCEventInfo->Id1();
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Double_t x1 = fMCEventInfo->X1();
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Double_t pdf1 = fMCEventInfo->Pdf1();
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Int_t id2 = fMCEventInfo->Id2();
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Double_t x2 = fMCEventInfo->X2();
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Double_t pdf2 = fMCEventInfo->Pdf2();
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if (GetFillHist()) {
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hDPDFHisto[0]->Fill(TMath::Min(Q,999.999));
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hDPDFHisto[1]->Fill(TMath::Min(pdf1,999.999));
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hDPDFHisto[2]->Fill(TMath::Min(pdf2,999.999));
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hDPDFHisto[3]->Fill(TMath::Min(x1,0.999));
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hDPDFHisto[4]->Fill(TMath::Min(x2,0.999));
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if(x1 + x2 > 0){
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hDPDFHisto[5]->Fill(TMath::Min(x1/(x1+x2),0.999));
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}
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}
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UInt_t nmembers = LHAPDF::numberPDF() + 1;
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// Array to be filled
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FArrDouble *PDFArr = new FArrDouble(nmembers);
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if(fRunPDF == kTRUE){
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ParticleOArr *leptons = GetObjThisEvt<ParticleOArr>(ModNames::gkMergedLeptonsName);
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if(leptons->GetEntries() >= 2){ // Nlep >= 2 to fill it
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if (fPrintDebug)
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cout << "Start loop over PDF members:" << endl;
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for (UInt_t i=0; i<nmembers; ++i) {
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LHAPDF::usePDFMember(i);
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Double_t newpdf1 = LHAPDF::xfx(x1, Q, id1)/x1;
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Double_t newpdf2 = LHAPDF::xfx(x2, Q, id2)/x2;
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Double_t TheWeight = newpdf1/pdf1*newpdf2/pdf2;
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if (fPrintDebug) {
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cout << i << " --> " << pdf1 << " " << pdf2 << " | "
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<< x1 << " " << x2 << " | "
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<< id1 << " " << id2 << " | "
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<< Q << " : " << TheWeight << endl;
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}
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if (GetFillHist()) {
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hDPDFHisto[6]->Fill(TMath::Min(TheWeight,99.999));
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hDPDFHisto[7]->Fill(TheWeight);
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}
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PDFArr->Add(TheWeight);
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}
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} // Nlep >= 2 to fill it
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else {
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for (UInt_t i=0; i<nmembers; ++i) PDFArr->Add(1.0);
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}
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}
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AddObjThisEvt(PDFArr, "PDFWeights");
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}
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//--------------------------------------------------------------------------------------------------
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void PDFProducerMod::SlaveBegin()
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{
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// Setup LHAPDF and book branch and histograms if wanted.
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gSystem->Setenv("LHAPATH","");
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LHAPDF::setVerbosity(LHAPDF::SILENT);
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LHAPDF::initPDFSet(fPDFName.Data());
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LHAPDF::getDescription();
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ReqBranch(fMCEvInfoName, fMCEventInfo);
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if (GetFillHist()) {
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char sb[1024];
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sprintf(sb,"hDPDFHisto_%d", 0); hDPDFHisto[0] = new TH1D(sb,sb,500,0,1000);
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sprintf(sb,"hDPDFHisto_%d", 1); hDPDFHisto[1] = new TH1D(sb,sb,500,0,1000);
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sprintf(sb,"hDPDFHisto_%d", 2); hDPDFHisto[2] = new TH1D(sb,sb,500,0,1000);
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sprintf(sb,"hDPDFHisto_%d", 3); hDPDFHisto[3] = new TH1D(sb,sb,100,0,1);
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sprintf(sb,"hDPDFHisto_%d", 4); hDPDFHisto[4] = new TH1D(sb,sb,100,0,1);
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sprintf(sb,"hDPDFHisto_%d", 5); hDPDFHisto[5] = new TH1D(sb,sb,100,0,1);
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sprintf(sb,"hDPDFHisto_%d", 6); hDPDFHisto[6] = new TH1D(sb,sb,500,0,100);
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sprintf(sb,"hDPDFHisto_%d", 7); hDPDFHisto[7] = new TH1D(sb,sb,1,0,1);
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for(int i=0; i<8; i++){
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AddOutput(hDPDFHisto[i]);
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}
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}
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}
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