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File indexing completed on 2021-02-14 14:21:09

0001 #include <ostream>
0002 
0003 #include "IOMC/ParticleGuns/interface/FlatRandomEThetaGunProducer.h"
0004 
0005 #include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
0006 #include "SimDataFormats/GeneratorProducts/interface/GenEventInfoProduct.h"
0007 
0008 #include "FWCore/Framework/interface/Event.h"
0009 #include "FWCore/ParameterSet/interface/ParameterSet.h"
0010 #include "FWCore/MessageLogger/interface/MessageLogger.h"
0011 #include "FWCore/ServiceRegistry/interface/Service.h"
0012 #include "FWCore/Utilities/interface/RandomNumberGenerator.h"
0013 
0014 #include "CLHEP/Random/RandFlat.h"
0015 
0016 namespace CLHEP {
0017   class HepRandomEngine;
0018 }
0019 
0020 using namespace edm;
0021 
0022 FlatRandomEThetaGunProducer::FlatRandomEThetaGunProducer(const edm::ParameterSet& pset)
0023     : FlatBaseThetaGunProducer(pset) {
0024   edm::ParameterSet defpset;
0025   edm::ParameterSet pgun_params = pset.getParameter<edm::ParameterSet>("PGunParameters");
0026 
0027   // doesn't seem necessary to check if pset is empty - if this
0028   // is the case, default values will be taken for params
0029   fMinE = pgun_params.getParameter<double>("MinE");
0030   fMaxE = pgun_params.getParameter<double>("MaxE");
0031 
0032   produces<HepMCProduct>("unsmeared");
0033   produces<GenEventInfoProduct>();
0034 
0035   //  edm::LogInfo("FlatThetaGun") << "Internal FlatRandomEThetaGun is initialzed"
0036   //                   << "\nIt is going to generate "
0037   //                   << remainingEvents() << " events";
0038 }
0039 
0040 FlatRandomEThetaGunProducer::~FlatRandomEThetaGunProducer() {}
0041 
0042 void FlatRandomEThetaGunProducer::produce(edm::Event& e, const edm::EventSetup& es) {
0043   if (fVerbosity > 0) {
0044     LogDebug("FlatThetaGun") << "FlatRandomEThetaGunProducer : Begin New Event Generation";
0045   }
0046 
0047   edm::Service<edm::RandomNumberGenerator> rng;
0048   CLHEP::HepRandomEngine* engine = &rng->getEngine(e.streamID());
0049 
0050   // event loop (well, another step in it...)
0051 
0052   // no need to clean up GenEvent memory - done in HepMCProduct
0053 
0054   // here re-create fEvt (memory)
0055   //
0056   fEvt = new HepMC::GenEvent();
0057 
0058   // now actualy, cook up the event from PDGTable and gun parameters
0059   //
0060 
0061   // 1st, primary vertex
0062   //
0063   HepMC::GenVertex* Vtx = new HepMC::GenVertex(HepMC::FourVector(0., 0., 0.));
0064 
0065   // loop over particles
0066   //
0067   int barcode = 1;
0068   for (unsigned int ip = 0; ip < fPartIDs.size(); ip++) {
0069     double energy = CLHEP::RandFlat::shoot(engine, fMinE, fMaxE);
0070     double theta = CLHEP::RandFlat::shoot(engine, fMinTheta, fMaxTheta);
0071     double phi = CLHEP::RandFlat::shoot(engine, fMinPhi, fMaxPhi);
0072     int PartID = fPartIDs[ip];
0073     const HepPDT::ParticleData* PData = fPDGTable->particle(HepPDT::ParticleID(abs(PartID)));
0074     double mass = PData->mass().value();
0075     double mom2 = energy * energy - mass * mass;
0076     double mom = (mom2 > 0. ? std::sqrt(mom2) : 0.);
0077     double px = mom * sin(theta) * cos(phi);
0078     double py = mom * sin(theta) * sin(phi);
0079     double pz = mom * cos(theta);
0080 
0081     HepMC::FourVector p(px, py, pz, energy);
0082     HepMC::GenParticle* Part = new HepMC::GenParticle(p, PartID, 1);
0083     Part->suggest_barcode(barcode);
0084     barcode++;
0085     Vtx->add_particle_out(Part);
0086 
0087     if (fAddAntiParticle) {
0088       HepMC::FourVector ap(-px, -py, -pz, energy);
0089       int APartID = -PartID;
0090       if (PartID == 22 || PartID == 23) {
0091         APartID = PartID;
0092       }
0093       HepMC::GenParticle* APart = new HepMC::GenParticle(ap, APartID, 1);
0094       APart->suggest_barcode(barcode);
0095       barcode++;
0096       Vtx->add_particle_out(APart);
0097     }
0098   }
0099   fEvt->add_vertex(Vtx);
0100   fEvt->set_event_number(e.id().event());
0101   fEvt->set_signal_process_id(20);
0102 
0103   if (fVerbosity > 0) {
0104     fEvt->print();
0105   }
0106 
0107   std::unique_ptr<HepMCProduct> BProduct(new HepMCProduct());
0108   BProduct->addHepMCData(fEvt);
0109   e.put(std::move(BProduct), "unsmeared");
0110 
0111   std::unique_ptr<GenEventInfoProduct> genEventInfo(new GenEventInfoProduct(fEvt));
0112   e.put(std::move(genEventInfo));
0113 
0114   if (fVerbosity > 0) {
0115     LogDebug("FlatThetaGun") << "FlatRandomEThetaGunProducer : Event Generation Done";
0116   }
0117 }