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ParticleHypothesisTests.cpp
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1 // This file is part of the Acts project.
2 //
3 // Copyright (C) 2023 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 #include <boost/test/unit_test.hpp>
10 
11 #include "Acts/Definitions/Units.hpp"
12 #include "Acts/EventData/Charge.hpp"
13 #include "Acts/EventData/ParticleHypothesis.hpp"
14 #include "Acts/Tests/CommonHelpers/FloatComparisons.hpp"
15 
16 #include <limits>
17 #include <type_traits>
18 
19 using namespace Acts::UnitLiterals;
20 
21 static auto eps = std::numeric_limits<double>::epsilon();
22 
23 BOOST_AUTO_TEST_SUITE(EventDataParticleHypothesis)
24 
25 BOOST_AUTO_TEST_CASE(Neutral) {
26  auto p = Acts::NeutralParticleHypothesis::pion0();
27 
28  BOOST_CHECK_EQUAL(p.extractCharge(1.23), 0_e);
29  BOOST_CHECK_EQUAL(p.extractCharge(2.54), 0_e);
30  BOOST_CHECK_EQUAL(p.extractCharge(-1.98), 0_e);
31  BOOST_CHECK_EQUAL(p.extractCharge(-2.23), 0_e);
32  CHECK_CLOSE_REL(p.extractMomentum(1 / 64_GeV), 64_GeV, eps);
33  CHECK_CLOSE_REL(p.extractMomentum(1 / 128_MeV), 128_MeV, eps);
34 }
35 
36 BOOST_AUTO_TEST_CASE(SinglyCharged) {
37  auto p = Acts::SinglyChargedParticleHypothesis::pion();
38 
39  BOOST_CHECK_EQUAL(p.extractCharge(1.23), 1_e);
40  BOOST_CHECK_EQUAL(p.extractCharge(2.54), 1_e);
41  BOOST_CHECK_EQUAL(p.extractCharge(-1.98), -1_e);
42  BOOST_CHECK_EQUAL(p.extractCharge(-2.23), -1_e);
43  CHECK_CLOSE_REL(p.extractMomentum(1_e / 64_GeV), 64_GeV, eps);
44  CHECK_CLOSE_REL(p.extractMomentum(1_e / 128_MeV), 128_MeV, eps);
45  CHECK_CLOSE_REL(p.extractMomentum(-1_e / 128_MeV), 128_MeV, eps);
46 }
47 
48 BOOST_AUTO_TEST_CASE(NonNeutralChargeSingle) {
49  auto p = Acts::NonNeutralChargedParticleHypothesis::pion();
50 
51  BOOST_CHECK_EQUAL(p.extractCharge(1.23), 1_e);
52  BOOST_CHECK_EQUAL(p.extractCharge(2.54), 1_e);
53  BOOST_CHECK_EQUAL(p.extractCharge(-1.98), -1_e);
54  BOOST_CHECK_EQUAL(p.extractCharge(-2.23), -1_e);
55  CHECK_CLOSE_REL(p.extractMomentum(1_e / 64_GeV), 64_GeV, eps);
56  CHECK_CLOSE_REL(p.extractMomentum(1_e / 128_MeV), 128_MeV, eps);
57  CHECK_CLOSE_REL(p.extractMomentum(-1_e / 128_MeV), 128_MeV, eps);
58 }
59 
60 BOOST_AUTO_TEST_CASE(NonNeutralChargeMultiple) {
61  auto p = Acts::NonNeutralChargedParticleHypothesis::pionLike(3_e);
62 
63  BOOST_CHECK_EQUAL(p.extractCharge(1.23), 3_e);
64  BOOST_CHECK_EQUAL(p.extractCharge(2.54), 3_e);
65  BOOST_CHECK_EQUAL(p.extractCharge(-1.98), -3_e);
66  BOOST_CHECK_EQUAL(p.extractCharge(-2.23), -3_e);
67  CHECK_CLOSE_REL(p.extractMomentum(3_e / 64_GeV), 64_GeV, eps);
68  CHECK_CLOSE_REL(p.extractMomentum(3_e / 128_MeV), 128_MeV, eps);
69  CHECK_CLOSE_REL(p.extractMomentum(-3_e / 128_MeV), 128_MeV, eps);
70 }
71 
72 BOOST_AUTO_TEST_CASE(AnyChargeNeutral) {
73  auto p = Acts::ParticleHypothesis::pion0();
74 
75  BOOST_CHECK_EQUAL(p.extractCharge(1.23), 0_e);
76  BOOST_CHECK_EQUAL(p.extractCharge(2.54), 0_e);
77  BOOST_CHECK_EQUAL(p.extractCharge(-1.98), 0_e);
78  BOOST_CHECK_EQUAL(p.extractCharge(-2.23), 0_e);
79  CHECK_CLOSE_REL(p.extractMomentum(1 / 64_GeV), 64_GeV, eps);
80  CHECK_CLOSE_REL(p.extractMomentum(1 / 128_MeV), 128_MeV, eps);
81 
82  // negative inputs should not occur for neutral particles
83  // the result is not defined, but we check it anyway
84  CHECK_CLOSE_REL(p.extractMomentum(-1 / 128_MeV), -128_MeV, eps);
85 }
86 
87 BOOST_AUTO_TEST_CASE(AnyChargeSingle) {
88  auto p = Acts::ParticleHypothesis::pion();
89 
90  BOOST_CHECK_EQUAL(p.extractCharge(1.23), 1_e);
91  BOOST_CHECK_EQUAL(p.extractCharge(2.54), 1_e);
92  BOOST_CHECK_EQUAL(p.extractCharge(-1.98), -1_e);
93  BOOST_CHECK_EQUAL(p.extractCharge(-2.23), -1_e);
94  CHECK_CLOSE_REL(p.extractMomentum(1_e / 64_GeV), 64_GeV, eps);
95  CHECK_CLOSE_REL(p.extractMomentum(1_e / 128_MeV), 128_MeV, eps);
96  CHECK_CLOSE_REL(p.extractMomentum(-1_e / 128_MeV), 128_MeV, eps);
97 }
98 
99 BOOST_AUTO_TEST_CASE(AnyChargeMultiple) {
100  auto p = Acts::ParticleHypothesis::pionLike(3_e);
101 
102  BOOST_CHECK_EQUAL(p.extractCharge(1.23), 3_e);
103  BOOST_CHECK_EQUAL(p.extractCharge(2.54), 3_e);
104  BOOST_CHECK_EQUAL(p.extractCharge(-1.98), -3_e);
105  BOOST_CHECK_EQUAL(p.extractCharge(-2.23), -3_e);
106  CHECK_CLOSE_REL(p.extractMomentum(3_e / 64_GeV), 64_GeV, eps);
107  CHECK_CLOSE_REL(p.extractMomentum(3_e / 128_MeV), 128_MeV, eps);
108  CHECK_CLOSE_REL(p.extractMomentum(-3_e / 128_MeV), 128_MeV, eps);
109 }
110 
111 BOOST_AUTO_TEST_SUITE_END()