| 1 |
// $Id: PDFProducerMod.cc,v 1.2 2009/08/11 10:50:38 loizides Exp $
|
| 2 |
|
| 3 |
#include "MitPhysics/Mods/interface/PDFProducerMod.h"
|
| 4 |
#include "MitCommon/MathTools/interface/MathUtils.h"
|
| 5 |
#include "MitAna/DataTree/interface/MCEventInfo.h"
|
| 6 |
#include "MitPhysics/Init/interface/ModNames.h"
|
| 7 |
#include <TH1D.h>
|
| 8 |
#include <TH2D.h>
|
| 9 |
#include <TSystem.h>
|
| 10 |
#include "LHAPDF/LHAPDF.h"
|
| 11 |
|
| 12 |
using namespace mithep;
|
| 13 |
|
| 14 |
ClassImp(mithep::PDFProducerMod)
|
| 15 |
|
| 16 |
//--------------------------------------------------------------------------------------------------
|
| 17 |
PDFProducerMod::PDFProducerMod(const char *name, const char *title) :
|
| 18 |
BaseMod(name,title),
|
| 19 |
fPrintDebug(kFALSE),
|
| 20 |
fMCEvInfoName(Names::gkMCEvtInfoBrn),
|
| 21 |
fPDFName("cteq65.LHgrid"),
|
| 22 |
fMCEventInfo(0)
|
| 23 |
{
|
| 24 |
// Constructor
|
| 25 |
}
|
| 26 |
|
| 27 |
//--------------------------------------------------------------------------------------------------
|
| 28 |
void PDFProducerMod::Process()
|
| 29 |
{
|
| 30 |
// Process entries of the tree.
|
| 31 |
|
| 32 |
LoadBranch(fMCEvInfoName);
|
| 33 |
|
| 34 |
Double_t Q = fMCEventInfo->Scale();
|
| 35 |
Int_t id1 = fMCEventInfo->Id1();
|
| 36 |
Double_t x1 = fMCEventInfo->X1();
|
| 37 |
Double_t pdf1 = fMCEventInfo->Pdf1();
|
| 38 |
Int_t id2 = fMCEventInfo->Id2();
|
| 39 |
Double_t x2 = fMCEventInfo->X2();
|
| 40 |
Double_t pdf2 = fMCEventInfo->Pdf2();
|
| 41 |
|
| 42 |
UInt_t nmembers = LHAPDF::numberPDF() + 1;
|
| 43 |
|
| 44 |
// Array to be filled
|
| 45 |
FArrDouble *PDFArr = new FArrDouble(nmembers);
|
| 46 |
|
| 47 |
if (fPrintDebug)
|
| 48 |
cout << "Start loop over PDF members:" << endl;
|
| 49 |
|
| 50 |
for (UInt_t i=0; i<nmembers; ++i) {
|
| 51 |
LHAPDF::usePDFMember(i);
|
| 52 |
Double_t newpdf1 = LHAPDF::xfx(x1, Q, id1)/x1;
|
| 53 |
Double_t newpdf2 = LHAPDF::xfx(x2, Q, id2)/x2;
|
| 54 |
Double_t TheWeight = newpdf1/pdf1*newpdf2/pdf2;
|
| 55 |
|
| 56 |
if (fPrintDebug) {
|
| 57 |
cout << i << " --> " << pdf1 << " " << pdf2 << " | "
|
| 58 |
<< x1 << " " << x2 << " | "
|
| 59 |
<< id1 << " " << id2 << " | "
|
| 60 |
<< Q << " : " << TheWeight << endl;
|
| 61 |
}
|
| 62 |
if (GetFillHist()) {
|
| 63 |
hDPDFHisto[0]->Fill(TheWeight);
|
| 64 |
}
|
| 65 |
PDFArr->Add(TheWeight);
|
| 66 |
}
|
| 67 |
|
| 68 |
AddObjThisEvt(PDFArr, "PDFWeights");
|
| 69 |
}
|
| 70 |
|
| 71 |
//--------------------------------------------------------------------------------------------------
|
| 72 |
void PDFProducerMod::SlaveBegin()
|
| 73 |
{
|
| 74 |
// Setup LHAPDF and book branch and histograms if wanted.
|
| 75 |
|
| 76 |
gSystem->Setenv("LHAPATH","");
|
| 77 |
LHAPDF::setVerbosity(LHAPDF::SILENT);
|
| 78 |
LHAPDF::initPDFSet(fPDFName.Data());
|
| 79 |
LHAPDF::getDescription();
|
| 80 |
|
| 81 |
ReqBranch(fMCEvInfoName, fMCEventInfo);
|
| 82 |
|
| 83 |
if (GetFillHist()) {
|
| 84 |
char sb[1024];
|
| 85 |
sprintf(sb,"hDPDFHisto_%d", 0);
|
| 86 |
hDPDFHisto[0] = new TH1D(sb,sb,1,0,1);
|
| 87 |
AddOutput(hDPDFHisto[0]);
|
| 88 |
}
|
| 89 |
}
|
