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#include "HepMC3/GenEvent.h"
#include "HepMC3/ReaderAscii.h"
#include "HepMC3/WriterAscii.h"
#include "HepMC3/Print.h"
#include <iostream>
using namespace HepMC3;
void neutrons_zdc(){
//-------------------------------------
WriterAscii hepmc_output("neutrons_zdc.hepmc");
int events_parsed = 0;
GenEvent evt(Units::GEV, Units::MM);
for (events_parsed = 0; events_parsed < 100; events_parsed++) {
// type 4 is beam
GenParticlePtr p1 =
std::make_shared<GenParticle>(FourVector(0.0, 0.0, 10.0, 10.0), 11, 4);
GenParticlePtr p2 = std::make_shared<GenParticle>(FourVector(0.0, 0.0, 0.0, 0.938), 2212, 4);
double pz_part = 1.0 + events_parsed*1.0;
// type 1 is final state
GenParticlePtr p3 =
std::make_shared<GenParticle>(FourVector(0.0,0.0,pz_part, std::sqrt(pz_part*pz_part + 0.938*0.938) ), 2112, 1);
GenVertexPtr v1 = std::make_shared<GenVertex>();
v1->add_particle_in(p1);
v1->add_particle_in(p2);
v1->add_particle_out(p3);
evt.add_vertex(v1);
if (events_parsed == 0) {
std::cout << "First event: " << std::endl;
Print::listing(evt);
}
hepmc_output.write_event(evt);
if (events_parsed % 10 == 0) {
std::cout << "Event: " << events_parsed << std::endl;
}
evt.clear();
}
hepmc_output.close();
std::cout << "Events parsed and written: " << events_parsed << std::endl;
}