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Fix setting cross section in Rivet analaysis #15462

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merged 1 commit into from Aug 22, 2016
Merged

Fix setting cross section in Rivet analaysis #15462

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1 change: 1 addition & 0 deletions GeneratorInterface/RivetInterface/interface/RivetAnalyzer.h
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Expand Up @@ -50,6 +50,7 @@ class RivetAnalyzer : public edm::EDAnalyzer
std::string _outFileName;
bool _doFinalize;
bool _produceDQM;
double _xsection;

DQMStore *dbe;
std::vector<MonitorElement *> _mes;
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52 changes: 30 additions & 22 deletions GeneratorInterface/RivetInterface/plugins/RivetAnalyzer.cc
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Expand Up @@ -19,7 +19,8 @@ _outFileName(pset.getParameter<std::string>("OutputFile")),
//decide whether to finlaize tthe plots or not.
//deciding not to finalize them can be useful for further harvesting of many jobs
_doFinalize(pset.getParameter<bool>("DoFinalize")),
_produceDQM(pset.getParameter<bool>("ProduceDQMOutput"))
_produceDQM(pset.getParameter<bool>("ProduceDQMOutput")),
_xsection(-1.)
{
//retrive the analysis name from paarmeter set
std::vector<std::string> analysisNames = pset.getParameter<std::vector<std::string> >("AnalysisNames");
Expand Down Expand Up @@ -47,11 +48,10 @@ _produceDQM(pset.getParameter<bool>("ProduceDQMOutput"))
std::set< AnaHandle, CmpAnaHandle >::const_iterator ibeg = analyses.begin();
std::set< AnaHandle, CmpAnaHandle >::const_iterator iend = analyses.end();
std::set< AnaHandle, CmpAnaHandle >::const_iterator iana;
double xsection = -1.;
xsection = pset.getParameter<double>("CrossSection");
_xsection = pset.getParameter<double>("CrossSection");
for (iana = ibeg; iana != iend; ++iana){
if ((*iana)->needsCrossSection())
(*iana)->setCrossSection(xsection);
(*iana)->setCrossSection(_xsection);
}
if (_produceDQM){
// book stuff needed for DQM
Expand Down Expand Up @@ -89,26 +89,34 @@ void RivetAnalyzer::analyze(const edm::Event& iEvent,const edm::EventSetup& iSet
// get HepMC GenEvent
const HepMC::GenEvent *myGenEvent = evt->GetEvent();

//if you want to use an external weight we have to clone the GenEvent and change the weight
if ( _useExternalWeight ){

//if you want to use an external weight or set the cross section we have to clone the GenEvent and change the weight
if ( _useExternalWeight || _xsection > 0 ){
HepMC::GenEvent * tmpGenEvtPtr = new HepMC::GenEvent( *(evt->GetEvent()) );
if (tmpGenEvtPtr->weights().size() == 0) {
throw cms::Exception("RivetAnalyzer") << "Original weight container has 0 size ";
}
if (tmpGenEvtPtr->weights().size() > 1) {
edm::LogWarning("RivetAnalyzer") << "Original event weight size is " << tmpGenEvtPtr->weights().size() << ". Will change only the first one ";
}

if (_xsection > 0){
HepMC::GenCrossSection xsec;
xsec.set_cross_section(_xsection);
tmpGenEvtPtr->set_cross_section(xsec);
}

if ( _useExternalWeight ){
if (tmpGenEvtPtr->weights().size() == 0) {
throw cms::Exception("RivetAnalyzer") << "Original weight container has 0 size ";
}
if (tmpGenEvtPtr->weights().size() > 1) {
edm::LogWarning("RivetAnalyzer") << "Original event weight size is " << tmpGenEvtPtr->weights().size() << ". Will change only the first one ";
}

if(!_useLHEweights){
edm::Handle<GenEventInfoProduct> genEventInfoProduct;
iEvent.getByToken(_genEventInfoCollection, genEventInfoProduct);
tmpGenEvtPtr->weights()[0] = genEventInfoProduct->weight();
}else{
edm::Handle<LHEEventProduct> lheEventHandle;
iEvent.getByToken(_LHECollection,lheEventHandle);
const LHEEventProduct::WGT& wgt = lheEventHandle->weights().at(_LHEweightNumber);
tmpGenEvtPtr->weights()[0] = wgt.wgt;
if(!_useLHEweights){
edm::Handle<GenEventInfoProduct> genEventInfoProduct;
iEvent.getByToken(_genEventInfoCollection, genEventInfoProduct);
tmpGenEvtPtr->weights()[0] = genEventInfoProduct->weight();
}else{
edm::Handle<LHEEventProduct> lheEventHandle;
iEvent.getByToken(_LHECollection,lheEventHandle);
const LHEEventProduct::WGT& wgt = lheEventHandle->weights().at(_LHEweightNumber);
tmpGenEvtPtr->weights()[0] = wgt.wgt;
}
}
myGenEvent = tmpGenEvtPtr;

Expand Down