ParametricParticleGenerator.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2017-2020 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#pragma once

#include "Acts/Definitions/PdgParticle.hpp"
#include "Acts/Definitions/Units.hpp"
#include "ActsExamples/EventData/SimParticle.hpp"
#include "ActsExamples/Framework/RandomNumbers.hpp"
#include "ActsExamples/Generators/EventGenerator.hpp"

#include <array>
#include <cmath>
#include <cstddef>
#include <limits>
#include <optional>

namespace ActsExamples {

class ParametricParticleGenerator : public EventGenerator::ParticlesGenerator {
 public:
  struct Config {
    double phiMin = -M_PI;
    double phiMax = M_PI;
    double thetaMin = std::numeric_limits<double>::min();
    double thetaMax = M_PI - std::numeric_limits<double>::epsilon();
    bool etaUniform = false;
    double pMin = 1 * Acts::UnitConstants::GeV;
    double pMax = 10 * Acts::UnitConstants::GeV;
    bool pTransverse = false;
    Acts::PdgParticle pdg = Acts::PdgParticle::eMuon;
    bool randomizeCharge = false;
    size_t numParticles = 1;

    std::optional<double> charge;
    std::optional<double> mass;
  };

  ParametricParticleGenerator(const Config& cfg);

  SimParticleContainer operator()(RandomEngine& rng) override;

 private:
  Config m_cfg;
  // will be automatically set from PDG data tables
  double m_charge;
  double m_mass;
  double m_cosThetaMin;
  double m_cosThetaMax;
  double m_etaMin;
  double m_etaMax;
};

}  // namespace ActsExamples