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Update of PDF reweighting supporting MadGraph use case, use first PDF as... #78

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merged 1 commit into from Aug 6, 2013
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Update of PDF reweighting supporting MadGraph use case, use first PDF as... #78

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7 changes: 7 additions & 0 deletions ElectroWeakAnalysis/Utilities/src/PdfWeightProducer.cc
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Expand Up @@ -28,6 +28,7 @@ class PdfWeightProducer : public edm::EDProducer {
virtual void endJob() ;

std::string fixPOWHEG_;
bool useFirstAsDefault_;
edm::InputTag genTag_;
edm::InputTag pdfInfoTag_;
std::vector<std::string> pdfSetNames_;
Expand All @@ -50,6 +51,7 @@ namespace LHAPDF {
/////////////////////////////////////////////////////////////////////////////////////
PdfWeightProducer::PdfWeightProducer(const edm::ParameterSet& pset) :
fixPOWHEG_(pset.getUntrackedParameter<std::string> ("FixPOWHEG", "")),
useFirstAsDefault_(pset.getUntrackedParameter<bool>("useFirstAsDefault",false)),
genTag_(pset.getUntrackedParameter<edm::InputTag> ("GenTag", edm::InputTag("genParticles"))),
pdfInfoTag_(pset.getUntrackedParameter<edm::InputTag> ("PdfInfoTag", edm::InputTag("generator"))),
pdfSetNames_(pset.getUntrackedParameter<std::vector<std::string> > ("PdfSetNames"))
Expand Down Expand Up @@ -106,6 +108,11 @@ void PdfWeightProducer::produce(edm::Event& iEvent, const edm::EventSetup&) {
int id2 = pdfstuff->pdf()->id.second;
double x2 = pdfstuff->pdf()->x.second;
double pdf2 = pdfstuff->pdf()->xPDF.second;
if (useFirstAsDefault_ && pdf1 == -1. && pdf2 == -1. ) {
LHAPDF::usePDFMember(1,0);
pdf1 = LHAPDF::xfx(1, x1, Q, id1)/x1;
pdf2 = LHAPDF::xfx(1, x2, Q, id2)/x2;
}

// Ad-hoc fix for POWHEG
if (fixPOWHEG_!="") {
Expand Down