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Adding dis benchmark.

Merged Whitney Armstrong requested to merge dis into master
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#include "HepMC3/GenEvent.h"
 
#include "HepMC3/ReaderAscii.h"
 
#include "HepMC3/WriterAscii.h"
 
#include "HepMC3/Print.h"
 
 
#include <iostream>
 
#include<random>
 
#include<cmath>
 
#include <math.h>
 
#include <TMath.h>
 
 
using namespace HepMC3;
 
 
/** Generate electrons in the central region.
 
* This is for testing detectors in the "barrel" region.
 
*/
 
void gen_central_electrons(int n_events = 100,
 
const char* out_fname = "central_electrons.hepmc")
 
{
 
double cos_theta_min = std::cos( 50.0*(M_PI/180.0));
 
double cos_theta_max = std::cos(130.0*(M_PI/180.0));
 
 
WriterAscii hepmc_output(out_fname);
 
int events_parsed = 0;
 
GenEvent evt(Units::GEV, Units::MM);
 
 
// Random number generator
 
TRandom *r1 = new TRandom();
 
 
for (events_parsed = 0; events_parsed < n_events; events_parsed++) {
 
// FourVector(px,py,pz,e,pdgid,status)
 
// type 4 is beam
 
// pdgid 11 - electron
 
// pdgid 111 - pi0
 
// pdgid 2212 - proton
 
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);
 
 
// Define momentum
 
Double_t p = r1->Uniform(1.0, 10.0);
 
Double_t phi = r1->Uniform(0.0, 2.0 * M_PI);
 
Double_t costh = r1->Uniform(cos_theta_min, cos_theta_max);
 
Double_t th = std::acos(costh);
 
Double_t px = p * std::cos(phi) * std::sin(th);
 
Double_t py = p * std::sin(phi) * std::sin(th);
 
Double_t pz = p * std::cos(th);
 
// Generates random vectors, uniformly distributed over the surface of a
 
// sphere of given radius, in this case momentum.
 
// r1->Sphere(px, py, pz, p);
 
 
//std::cout << std::sqrt(px*px + py*py + pz*pz) - p << " is zero? \n";
 
 
// type 1 is final state
 
// pdgid 11 - electron 0.510 MeV/c^2
 
GenParticlePtr p3 = std::make_shared<GenParticle>(
 
FourVector(
 
px, py, pz,
 
sqrt(p*p + (0.000511 * 0.000511))),
 
11, 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 % 10000 == 0) {
 
std::cout << "Event: " << events_parsed << std::endl;
 
}
 
evt.clear();
 
}
 
hepmc_output.close();
 
std::cout << "Events parsed and written: " << events_parsed << std::endl;
 
}
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