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TutorialVertexFinderExample.cpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2020 CERN for the benefit of the Acts project
4 //
5 // This Source Code Form is subject to the terms of the Mozilla Public
6 // License, v. 2.0. If a copy of the MPL was not distributed with this
7 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 
20 
21 #include <memory>
22 
23 using namespace Acts::UnitLiterals;
24 using namespace ActsExamples;
25 
26 int main(int argc, char* argv[]) {
27  // setup and parse options
28  auto desc = Options::makeDefaultOptions();
35  Options::addOutputOptions(desc, OutputFormat::DirectoryOnly);
37  auto vars = Options::parse(desc, argc, argv);
38  if (vars.empty()) {
39  return EXIT_FAILURE;
40  }
41 
42  // basic setup
43  auto logLevel = Options::readLogLevel(vars);
44  auto rnd =
45  std::make_shared<RandomNumbers>(Options::readRandomNumbersConfig(vars));
46  Sequencer sequencer(Options::readSequencerConfig(vars));
47 
48  // Setup the magnetic field
50 
51  // setup event generator
53  evgen.outputParticles = "particles_generated";
54  evgen.randomNumbers = rnd;
55  sequencer.addReader(std::make_shared<EventGenerator>(evgen, logLevel));
56 
57  // pre-select particles
58  ParticleSelector::Config selectParticles =
60  selectParticles.inputParticles = evgen.outputParticles;
61  selectParticles.outputParticles = "particles_selected";
62  // smearing only works with charge particles for now
63  selectParticles.removeNeutral = true;
64  selectParticles.absEtaMax = vars["vertexing-eta-max"].as<double>();
65  selectParticles.rhoMax = vars["vertexing-rho-max"].as<double>() * 1_mm;
66  selectParticles.ptMin = vars["vertexing-pt-min"].as<double>() * 1_MeV;
67  sequencer.addAlgorithm(
68  std::make_shared<ParticleSelector>(selectParticles, logLevel));
69 
70  // Run the particle smearing
71  auto particleSmearingCfg = setupParticleSmearing(
72  vars, sequencer, rnd, selectParticles.outputParticles);
73 
74  // find vertices
76  findVertices.bField = magneticField;
77  findVertices.inputTrackParameters = particleSmearingCfg.outputTrackParameters;
78  findVertices.outputProtoVertices = "protovertices";
79  sequencer.addAlgorithm(
80  std::make_shared<TutorialVertexFinderAlgorithm>(findVertices, logLevel));
81 
82  return sequencer.run();
83 }