BetheBlochTests.cpp

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// This file is part of the Acts project.
//
// Copyright (C) 2018-2021 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/.

#include <boost/test/data/test_case.hpp>
#include <boost/test/unit_test.hpp>

#include "Acts/Tests/CommonHelpers/PredefinedMaterials.hpp"
#include "ActsFatras/EventData/Particle.hpp"
#include "ActsFatras/Physics/ElectroMagnetic/BetheBloch.hpp"

#include <array>
#include <random>

#include "Dataset.hpp"

using Generator = std::ranlux48;

BOOST_DATA_TEST_CASE(FatrasBetheBloch, Dataset::parameters, pdg, phi, lambda, p,
                     seed) {
  Generator gen(seed);
  ActsFatras::Particle before = Dataset::makeParticle(pdg, phi, lambda, p);
  ActsFatras::Particle after = before;

  ActsFatras::BetheBloch process;
  const auto outgoing = process(gen, Acts::Test::makeUnitSlab(), after);
  // energy loss changes momentum and energy
  BOOST_CHECK_LT(after.absoluteMomentum(), before.absoluteMomentum());
  BOOST_CHECK_LT(after.energy(), before.energy());
  // energy loss creates no new particles
  BOOST_CHECK(outgoing.empty());
}