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#include "PythiaAllDauVFilter.h"
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
#include <iostream>
#include <memory>
#include <vector>
using namespace edm;
using namespace std;
using namespace Pythia8;
PythiaAllDauVFilter::PythiaAllDauVFilter(const edm::ParameterSet& iConfig)
: fVerbose(iConfig.getUntrackedParameter("verbose", 0)),
token_(consumes<edm::HepMCProduct>(iConfig.getUntrackedParameter<edm::InputTag>("moduleLabel"))),
particleID(iConfig.getUntrackedParameter("ParticleID", 0)),
motherID(iConfig.getUntrackedParameter("MotherID", 0)),
chargeconju(iConfig.getUntrackedParameter("ChargeConjugation", true)),
ndaughters(iConfig.getUntrackedParameter("NumberDaughters", 0)),
maxptcut(iConfig.getUntrackedParameter("MaxPt", 14000.)) {
//now do what ever initialization is needed
vector<int> defdauID;
defdauID.push_back(0);
dauIDs = iConfig.getUntrackedParameter<vector<int> >("DaughterIDs", defdauID);
vector<double> defminptcut;
defminptcut.push_back(0.);
minptcut = iConfig.getUntrackedParameter<vector<double> >("MinPt", defminptcut);
vector<double> defminetacut;
defminetacut.push_back(-10.);
minetacut = iConfig.getUntrackedParameter<vector<double> >("MinEta", defminetacut);
vector<double> defmaxetacut;
defmaxetacut.push_back(10.);
maxetacut = iConfig.getUntrackedParameter<vector<double> >("MaxEta", defmaxetacut);
// create pythia8 instance to access particle data
edm::LogInfo("PythiaAllDauVFilter") << "Creating pythia8 instance for particle properties" << endl;
if (!fLookupGen.get())
fLookupGen = std::make_unique<Pythia>();
if (chargeconju) {
antiParticleID = -particleID;
if (!(fLookupGen->particleData.isParticle(antiParticleID)))
antiParticleID = particleID;
int antiId;
for (size_t i = 0; i < dauIDs.size(); i++) {
antiId = -dauIDs[i];
if (!(fLookupGen->particleData.isParticle(antiId)))
antiId = dauIDs[i];
antiDauIDs.push_back(antiId);
}
}
edm::LogInfo("PythiaAllDauVFilter") << "----------------------------------------------------------------------"
<< endl;
edm::LogInfo("PythiaAllDauVFilter") << "--- PythiaAllDauVFilter" << endl;
for (unsigned int i = 0; i < dauIDs.size(); ++i) {
edm::LogInfo("PythiaAllDauVFilter") << "ID: " << dauIDs[i] << " pT > " << minptcut[i] << " " << minetacut[i]
<< " eta < " << maxetacut[i] << endl;
}
if (chargeconju)
for (unsigned int i = 0; i < antiDauIDs.size(); ++i) {
edm::LogInfo("PythiaAllDauVFilter") << "ID: " << antiDauIDs[i] << " pT > " << minptcut[i] << " " << minetacut[i]
<< " eta < " << maxetacut[i] << endl;
}
edm::LogInfo("PythiaAllDauVFilter") << "maxptcut = " << maxptcut << endl;
edm::LogInfo("PythiaAllDauVFilter") << "particleID = " << particleID << endl;
if (chargeconju)
edm::LogInfo("PythiaAllDauVFilter") << "antiParticleID = " << antiParticleID << endl;
edm::LogInfo("PythiaAllDauVFilter") << "motherID = " << motherID << endl;
}
PythiaAllDauVFilter::~PythiaAllDauVFilter() {
// do anything here that needs to be done at desctruction time
// (e.g. close files, deallocate resources etc.)
}
//
// member functions
//
// ------------ method called to produce the data ------------
bool PythiaAllDauVFilter::filter(edm::StreamID, edm::Event& iEvent, const edm::EventSetup& iSetup) const {
using namespace edm;
bool accepted = false;
Handle<HepMCProduct> evt;
iEvent.getByToken(token_, evt);
int OK(1);
vector<int> vparticles;
vector<bool> foundDaughter(dauIDs.size(), false);
const std::vector<int>* dauCollection = nullptr;
HepMC::GenEvent* myGenEvent = new HepMC::GenEvent(*(evt->GetEvent()));
if (fVerbose > 5) {
edm::LogInfo("PythiaAllDauVFilter") << "looking for " << particleID << endl;
}
for (HepMC::GenEvent::particle_iterator p = myGenEvent->particles_begin(); p != myGenEvent->particles_end(); ++p) {
if ((*p)->pdg_id() == particleID) {
dauCollection = &(dauIDs);
} else if (chargeconju and ((*p)->pdg_id() == antiParticleID)) {
dauCollection = &(antiDauIDs);
} else {
continue;
}
// -- Check for mother of this particle
if (0 != motherID) {
OK = 0;
for (HepMC::GenVertex::particles_in_const_iterator des = (*p)->production_vertex()->particles_in_const_begin();
des != (*p)->production_vertex()->particles_in_const_end();
++des) {
if (fVerbose > 10) {
edm::LogInfo("PythiaAllDauVFilter") << "mother: " << (*des)->pdg_id() << " pT: " << (*des)->momentum().perp()
<< " eta: " << (*des)->momentum().eta() << endl;
}
if (abs(motherID) == abs((*des)->pdg_id())) {
OK = 1;
break;
}
}
}
if (0 == OK)
continue;
// -- check for daugthers
int ndau = 0;
for (unsigned int i = 0; i < foundDaughter.size(); ++i) {
foundDaughter[i] = false;
}
if (fVerbose > 5) {
edm::LogInfo("PythiaAllDauVFilter") << "found ID: " << (*p)->pdg_id() << " pT: " << (*p)->momentum().perp()
<< " eta: " << (*p)->momentum().eta() << endl;
}
if ((*p)->end_vertex()) {
for (HepMC::GenVertex::particle_iterator des = (*p)->end_vertex()->particles_begin(HepMC::children);
des != (*p)->end_vertex()->particles_end(HepMC::children);
++des) {
++ndau;
if (fVerbose > 5) {
edm::LogInfo("PythiaAllDauVFilter")
<< "\t daughter : ID: " << (*des)->pdg_id() << " pT: " << (*des)->momentum().perp()
<< " eta: " << (*des)->momentum().eta() << endl;
}
for (unsigned int i = 0; i < dauCollection->size(); ++i) {
if ((*des)->pdg_id() != dauCollection->at(i))
continue;
// possible to have more than one daughter of same pdgID and same/different kinematic constraints
if (foundDaughter[i])
continue;
if (fVerbose > 5) {
edm::LogInfo("PythiaAllDauVFilter")
<< "\t\t checking cuts of , daughter i = " << i << " pT = " << (*des)->momentum().perp()
<< " eta = " << (*des)->momentum().eta() << endl;
}
if ((*des)->momentum().perp() > minptcut[i] && (*des)->momentum().perp() < maxptcut &&
(*des)->momentum().eta() > minetacut[i] && (*des)->momentum().eta() < maxetacut[i]) {
foundDaughter[i] = true;
vparticles.push_back((*des)->pdg_id());
if (fVerbose > 2) {
edm::LogInfo("PythiaAllDauVFilter")
<< "\t accepted this particle " << (*des)->pdg_id() << " pT = " << (*des)->momentum().perp()
<< " eta = " << (*des)->momentum().eta() << endl;
}
break;
}
}
}
}
// -- ( number of daughtrs == daughters passing cut ) and ( all daughters specified are found)
if (ndau == ndaughters) {
accepted = true;
for (unsigned int i = 0; i < foundDaughter.size(); ++i) {
if (!foundDaughter[i]) {
accepted = false;
}
}
if (accepted and (fVerbose > 0)) {
edm::LogInfo("PythiaAllDauVFilter") << " accepted this decay from " << (*p)->pdg_id();
for (unsigned int iv = 0; iv < vparticles.size(); ++iv)
edm::LogInfo("PythiaAllDauVFilter") << vparticles[iv] << " ";
edm::LogInfo("PythiaAllDauVFilter") << " from mother = " << motherID << endl;
}
}
if (accepted)
break;
}
delete myGenEvent;
return accepted;
}
//define this as a plug-in
DEFINE_FWK_MODULE(PythiaAllDauVFilter);
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