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loizides |
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// $Id: PDFProducerMod.cc,v 1.2 2009/08/11 10:50:38 loizides 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 "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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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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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 (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[0]->Fill(TheWeight);
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}
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PDFArr->Add(TheWeight);
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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);
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hDPDFHisto[0] = new TH1D(sb,sb,1,0,1);
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AddOutput(hDPDFHisto[0]);
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}
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}
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