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#include <iostream>
#include <memory>
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/one/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/Run.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "SimDataFormats/GeneratorProducts/interface/LHEEventProduct.h"
#include "SimDataFormats/GeneratorProducts/interface/LHERunInfoProduct.h"
#include "SimDataFormats/GeneratorProducts/interface/GenEventInfoProduct.h"
#include <sstream>
//class that reweights a pure parton level event from the originale COM energy to
//an energy that is < than original COM energy.
//
// class declaration
//
class LHECOMWeightProducer : public edm::one::EDProducer<edm::one::WatchRuns> {
public:
explicit LHECOMWeightProducer(const edm::ParameterSet&);
~LHECOMWeightProducer() override = default;
private:
void beginJob() override;
void beginRun(edm::Run const& run, const edm::EventSetup& es) override;
void endRun(edm::Run const& run, const edm::EventSetup& es) override {}
void produce(edm::Event&, const edm::EventSetup&) override;
const edm::InputTag lheTag_;
const double _newECMS;
const edm::EDGetTokenT<LHERunInfoProduct> tokenLHERun_;
const edm::EDGetTokenT<LHEEventProduct> tokenLHEEvent_;
int _pdfset;
int _pdfmember;
double _origECMS;
std::string _label;
};
#include "SimDataFormats/GeneratorProducts/interface/GenEventInfoProduct.h"
namespace LHAPDF {
void initPDFSet(int nset, int setid, int member = 0);
int numberPDF(int nset);
void usePDFMember(int nset, int member);
double xfx(int nset, double x, double Q, int fl);
double getXmin(int nset, int member);
double getXmax(int nset, int member);
double getQ2min(int nset, int member);
double getQ2max(int nset, int member);
void extrapolate(bool extrapolate = true);
} // namespace LHAPDF
/////////////////////////////////////////////////////////////////////////////////////
LHECOMWeightProducer::LHECOMWeightProducer(const edm::ParameterSet& pset)
: lheTag_(pset.getParameter<edm::InputTag>("lheSrc")),
_newECMS(pset.getParameter<double>("NewECMS")),
tokenLHERun_(consumes<LHERunInfoProduct, edm::InRun>(lheTag_)),
tokenLHEEvent_(consumes<LHEEventProduct>(lheTag_)) {
std::stringstream labelStr;
labelStr << "com"
<< "To" << _newECMS;
_label = labelStr.str();
produces<GenEventInfoProduct>(_label);
}
/////////////////////////////////////////////////////////////////////////////////////
void LHECOMWeightProducer::beginRun(edm::Run const& run, const edm::EventSetup& es) {
using namespace edm;
const edm::Handle<LHERunInfoProduct>& lheRun = run.getHandle(tokenLHERun_);
//assumes the same pdf is used for both beams
_pdfset = lheRun->heprup().PDFSUP.first;
_pdfmember = lheRun->heprup().PDFGUP.first;
_origECMS = lheRun->heprup().EBMUP.first + lheRun->heprup().EBMUP.second;
edm::LogInfo("LHECOMWeightProducer") << "PDFSET: " << _pdfset << "; member: " << _pdfmember
<< "; COM energy: " << _origECMS;
if (_newECMS > _origECMS)
throw cms::Exception("LHECOMWeightProducer") << "You cannot reweight COM energy to a higher than original energy ";
LHAPDF::initPDFSet(1, _pdfset, _pdfmember);
}
/////////////////////////////////////////////////////////////////////////////////////
void LHECOMWeightProducer::beginJob() {
//LHAPDF::initPDFSet(1,pdfSetName_);
}
/////////////////////////////////////////////////////////////////////////////////////
void LHECOMWeightProducer::produce(edm::Event& iEvent, const edm::EventSetup&) {
using namespace std;
bool verbose = false;
if (iEvent.isRealData())
return;
const edm::Handle<LHEEventProduct>& lheevent = iEvent.getHandle(tokenLHEEvent_);
float Q = lheevent->hepeup().SCALUP;
int id1 = lheevent->hepeup().IDUP[0];
double x1 = fabs(lheevent->hepeup().PUP[0][2] / (_origECMS / 2));
double x1prime = fabs(lheevent->hepeup().PUP[0][2] / (_newECMS / 2));
int id2 = lheevent->hepeup().IDUP[1];
double x2 = fabs(lheevent->hepeup().PUP[1][2] / (_origECMS / 2));
double x2prime = fabs(lheevent->hepeup().PUP[1][2] / (_newECMS / 2));
LogTrace("LHECOMWeightProducer") << "*******LHECOMWeightProducer*******\n"
<< " Q : " << Q << "\n"
<< " id1: " << id1 << "\n"
<< " x1 : " << x1 << "\n"
<< " x1': " << x1prime << "\n"
<< " id2: " << id2 << "\n"
<< " x2 : " << x2 << "\n"
<< " x2': " << x2prime;
//gluon is 0 in the LHAPDF numbering
if (id1 == 21)
id1 = 0;
if (id2 == 21)
id2 = 0;
// Put PDF weights in the event
if (verbose)
cout << " Set : " << _pdfset << " member : " << _pdfmember << endl;
LHAPDF::usePDFMember(1, _pdfmember);
double oldpdf1 = LHAPDF::xfx(1, x1, Q, id1) / x1;
double oldpdf2 = LHAPDF::xfx(1, x2, Q, id2) / x2;
double newpdf1 = LHAPDF::xfx(1, x1prime, Q, id1) / x1prime;
double newpdf2 = LHAPDF::xfx(1, x2prime, Q, id2) / x2prime;
LogTrace("LHECOMWeightProducer") << " xfx1 : " << oldpdf1 << "\n"
<< " xfx2 : " << oldpdf2 << "\n"
<< " xfx1': " << newpdf1 << "\n"
<< " xfx2': " << newpdf2 << "\n"
<< " weight:" << (newpdf1 / oldpdf1) * (newpdf2 / oldpdf2);
double weight = (newpdf1 / oldpdf1) * (newpdf2 / oldpdf2);
std::vector<double> weights;
weights.push_back(weight);
std::unique_ptr<GenEventInfoProduct> info(new GenEventInfoProduct());
info->setWeights(weights);
iEvent.put(std::move(info), _label);
}
DEFINE_FWK_MODULE(LHECOMWeightProducer);
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