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Highland.hpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2018-2020 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 
9 #pragma once
10 
11 #include <random>
12 
15 
16 namespace ActsFatras {
17 namespace detail {
18 
23 struct Highland {
32  template <typename generator_t>
33  double operator()(generator_t &generator,
34  const Acts::MaterialProperties &slab,
35  Particle &particle) const {
36  // compute the planar scattering angle
37  const auto theta0 = Acts::computeMultipleScatteringTheta0(
38  slab, particle.pdg(), particle.mass(),
39  particle.charge() / particle.absMomentum(), particle.charge());
40  // draw from the normal distribution representing the 3d angle distribution
41  return std::normal_distribution<double>(0.0, M_SQRT2 * theta0)(generator);
42  }
43 };
44 
45 } // namespace detail
46 
48 
49 } // namespace ActsFatras