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

0001 #include <ostream>
0002 
0003 #include "IOMC/ParticleGuns/interface/GaussRandomPThetaGunProducer.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/RandGaussQ.h"
0015 #include "CLHEP/Random/RandFlat.h"
0016 
0017 //#define DebugLog
0018 
0019 namespace CLHEP {
0020   class HepRandomEngine;
0021 }
0022 
0023 using namespace edm;
0024 
0025 GaussRandomPThetaGunProducer::GaussRandomPThetaGunProducer(const edm::ParameterSet& pset)
0026     : FlatBaseThetaGunProducer(pset) {
0027   edm::ParameterSet defpset;
0028   edm::ParameterSet pgun_params = pset.getParameter<edm::ParameterSet>("PGunParameters");
0029 
0030   // doesn't seem necessary to check if pset is empty - if this
0031   // is the case, default values will be taken for params
0032   fMeanP = pgun_params.getParameter<double>("MeanP");
0033   fSigmaP = pgun_params.getParameter<double>("SigmaP");
0034   fMeanTheta = 0.5 * (fMinTheta + fMaxTheta);
0035   fSigmaTheta = 0.5 * (fMaxTheta - fMinTheta);
0036 
0037   produces<HepMCProduct>("unsmeared");
0038   produces<GenEventInfoProduct>();
0039 }
0040 
0041 GaussRandomPThetaGunProducer::~GaussRandomPThetaGunProducer() {}
0042 
0043 void GaussRandomPThetaGunProducer::produce(edm::Event& e, const edm::EventSetup& es) {
0044 #ifdef DebugLog
0045   if (fVerbosity >= 0)
0046     std::cout << "GaussRandomPThetaGunProducer : Begin New Event Generation\n";
0047 #endif
0048   edm::Service<edm::RandomNumberGenerator> rng;
0049   CLHEP::HepRandomEngine* engine = &rng->getEngine(e.streamID());
0050 
0051   // event loop (well, another step in it...)
0052 
0053   // no need to clean up GenEvent memory - done in HepMCProduct
0054 
0055   // here re-create fEvt (memory)
0056   //
0057   fEvt = new HepMC::GenEvent();
0058 
0059   // now actualy, cook up the event from PDGTable and gun parameters
0060   //
0061 
0062   // 1st, primary vertex
0063   //
0064   HepMC::GenVertex* Vtx = new HepMC::GenVertex(HepMC::FourVector(0., 0., 0.));
0065 
0066   // loop over particles
0067   //
0068   int barcode = 1;
0069   for (unsigned int ip = 0; ip < fPartIDs.size(); ip++) {
0070     double mom = CLHEP::RandGaussQ::shoot(engine, fMeanP, fSigmaP);
0071     double theta = CLHEP::RandGaussQ::shoot(engine, fMeanTheta, fSigmaTheta);
0072     double phi = CLHEP::RandFlat::shoot(engine, fMinPhi, fMaxPhi);
0073     int PartID = fPartIDs[ip];
0074     const HepPDT::ParticleData* PData = fPDGTable->particle(HepPDT::ParticleID(abs(PartID)));
0075     double mass = PData->mass().value();
0076     double energy = sqrt(mom * mom + mass * mass);
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 #ifdef DebugLog
0104   if (fVerbosity >= 0)
0105     fEvt->print();
0106 #endif
0107 
0108   std::unique_ptr<HepMCProduct> BProduct(new HepMCProduct());
0109   BProduct->addHepMCData(fEvt);
0110   e.put(std::move(BProduct), "unsmeared");
0111 
0112   std::unique_ptr<GenEventInfoProduct> genEventInfo(new GenEventInfoProduct(fEvt));
0113   e.put(std::move(genEventInfo));
0114 
0115 #ifdef DebugLog
0116   if (fVerbosity >= 0)
0117     std::cout << "GaussRandomPThetaGunProducer : Event Generation Done\n";
0118 #endif
0119 }