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Highland.hpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2018-2021 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 
12 
13 #include <random>
14 
15 namespace ActsFatras {
16 namespace detail {
17 
22 struct Highland {
31  template <typename generator_t>
32  double operator()(generator_t &generator, const Acts::MaterialSlab &slab,
33  Particle &particle) const {
34  // compute the planar scattering angle
35  const auto theta0 = Acts::computeMultipleScatteringTheta0(
36  slab, particle.absolutePdg(), particle.mass(), particle.qOverP(),
37  particle.absoluteCharge());
38  // draw from the normal distribution representing the 3d angle distribution
39  return std::normal_distribution<double>(0.0, M_SQRT2 * theta0)(generator);
40  }
41 };
42 
43 } // namespace detail
44 } // namespace ActsFatras