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26 // 26 //
27 /// \file eventgenerator/pythia/pythia8decayer 27 /// \file eventgenerator/pythia/pythia8decayer/src/Py8Decayer.cc
28 /// \brief Implementation of the Py8Decayer cl 28 /// \brief Implementation of the Py8Decayer class
29 /// 29 ///
30 /// \author J. Yarba; FNAL 30 /// \author J. Yarba; FNAL
31 31
32 #include "Py8Decayer.hh" 32 #include "Py8Decayer.hh"
33 33
34 #include "Py8DecayerEngine.hh" <<
35 <<
36 #include "G4DynamicParticle.hh" 34 #include "G4DynamicParticle.hh"
37 #include "G4ParticleTable.hh" 35 #include "G4ParticleTable.hh"
38 #include "G4SystemOfUnits.hh" <<
39 #include "G4Track.hh" 36 #include "G4Track.hh"
>> 37 #include "G4SystemOfUnits.hh"
40 38
41 using namespace Pythia8; 39 using namespace Pythia8;
42 40
43 //....oooOO0OOooo........oooOO0OOooo........oo 41 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44 42
45 Py8Decayer::Py8Decayer() : G4VExtDecayer("Py8D << 43 Py8Decayer::Py8Decayer()
>> 44 : G4VExtDecayer("Py8Decayer"),
>> 45 fDecayer(nullptr)
46 { 46 {
47 // use default path to the xml/configs but d << 47
48 // << 48 // use default path to the xml/configs but do NOT print banner
49 fDecayer = new Pythia("../share/Pythia8/xmld << 49 //
50 << 50 fDecayer = new Pythia( "../share/Pythia8/xmldoc", false );
51 fDecayer->setRndmEnginePtr(std::make_shared< << 51
52 << 52 // this is the trick to make Pythia8 work as "decayer"
53 // this is the trick to make Pythia8 work as << 53 //
54 // << 54 fDecayer->readString("ProcessLevel:all = off");
55 fDecayer->readString("ProcessLevel:all = off << 55
56 << 56 fDecayer->readString("ProcessLevel:resonanceDecays=on");
57 fDecayer->readString("ProcessLevel:resonance << 57
58 << 58 // shut off Pythia8 (default) verbosty
59 // shut off Pythia8 (default) verbosty << 59 //
60 // << 60 fDecayer->readString("Init:showAllSettings=false");
61 fDecayer->readString("Init:showAllSettings=f << 61 fDecayer->readString("Init:showChangedSettings=false");
62 fDecayer->readString("Init:showChangedSettin << 62 fDecayer->readString("Init:showAllParticleData=false");
63 fDecayer->readString("Init:showAllParticleDa << 63 fDecayer->readString("Init:showChangedParticleData=false");
64 fDecayer->readString("Init:showChangedPartic << 64 //
65 // << 65 // specify how many Py8 events to print out, at either level
66 // specify how many Py8 events to print out, << 66 // in this particular case print out a maximum of 10 events
67 // in this particular case print out a maxim << 67 //
68 // << 68 fDecayer->readString("Next:numberShowProcess = 0" );
69 fDecayer->readString("Next:numberShowProcess << 69 fDecayer->readString("Next:numberShowEvent = 10");
70 fDecayer->readString("Next:numberShowEvent = << 70
71 << 71 fDecayer->init();
72 fDecayer->init(); << 72
73 << 73 // shut off decays of pi0's as we want Geant4 to handle them
74 // shut off decays of pi0's as we want Geant << 74 // if other immediate decay products should be handled by Geant4,
75 // if other immediate decay products should << 75 // their respective decay modes should be shut off as well
76 // their respective decay modes should be sh << 76 //
77 // << 77 fDecayer->readString("111:onMode = off");
78 fDecayer->readString("111:onMode = off"); <<
79 } 78 }
80 79
81 //....oooOO0OOooo........oooOO0OOooo........oo 80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
82 81
83 Py8Decayer::~Py8Decayer() 82 Py8Decayer::~Py8Decayer()
84 { 83 {
85 delete fDecayer; << 84
>> 85 delete fDecayer;
>> 86
86 } 87 }
87 88
88 //....oooOO0OOooo........oooOO0OOooo........oo 89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
89 90
90 G4DecayProducts* Py8Decayer::ImportDecayProduc 91 G4DecayProducts* Py8Decayer::ImportDecayProducts(const G4Track& track)
91 { 92 {
92 fDecayer->event.reset(); <<
93 <<
94 G4DecayProducts* dproducts = nullptr; <<
95 93
96 G4ParticleDefinition* pd = track.GetDefiniti << 94 fDecayer->event.reset();
97 int pdgid = pd->GetPDGEncoding(); << 95
>> 96 G4DecayProducts* dproducts = nullptr;
>> 97
>> 98 G4ParticleDefinition* pd = track.GetDefinition();
>> 99 int pdgid = pd->GetPDGEncoding();
>> 100
>> 101 // check if pdgid is consistent with Pythia8 particle table
>> 102 //
>> 103 if ( !fDecayer->particleData.findParticle( pdgid ) )
>> 104 {
>> 105 G4cout << " can NOT find pdgid = " << pdgid
>> 106 << " in Pythia8::ParticleData" << G4endl;
>> 107 return dproducts;
>> 108 }
>> 109
>> 110 if ( !fDecayer->particleData.canDecay(pdgid) )
>> 111 {
>> 112 G4cout << " Particle of pdgid = " << pdgid
>> 113 << " can NOT be decayed by Pythia8" << G4endl;
>> 114 return dproducts;
>> 115 }
>> 116
>> 117 // NOTE: Energy should be in GeV
>> 118
>> 119 fDecayer->event.append( pdgid, 1, 0, 0,
>> 120 track.GetMomentum().x() / CLHEP::GeV,
>> 121 track.GetMomentum().y() / CLHEP::GeV,
>> 122 track.GetMomentum().z() / CLHEP::GeV,
>> 123 track.GetDynamicParticle()->GetTotalEnergy() / CLHEP::GeV,
>> 124 pd->GetPDGMass() / CLHEP::GeV );
>> 125
>> 126 // specify polarization, if any
>> 127
>> 128 // NOTE: while in Py8 polarization is a double variable ,
>> 129 // in reality it's expected to be -1, 0., or 1 in case of "external" tau's,
>> 130 // similar to LHA SPINUP; see Particle Decays, Hadron and Tau Decays in docs at
>> 131 // https://pythia.org/manuals/pythia8305/Welcome.html
>> 132 // so it's not able to handle anything like 0.99, thus we're rounding off
>> 133 fDecayer->event.back().pol(
>> 134 round( std::cos( track.GetPolarization().angle( track.GetMomentumDirection() ) )
>> 135 )
>> 136 );
>> 137
>> 138 int npart_before_decay = fDecayer->event.size();
>> 139
>> 140 fDecayer->next();
>> 141
>> 142 int npart_after_decay = fDecayer->event.size();
>> 143
>> 144 // create & fill up decay products
>> 145 //
>> 146 dproducts = new G4DecayProducts(*(track.GetDynamicParticle()));
>> 147
>> 148 // create G4DynamicParticle out of each fDecayer->event entry (except the 1st one)
>> 149 // and push into dproducts
>> 150
>> 151 for ( int ip=npart_before_decay; ip<npart_after_decay; ++ip )
>> 152 {
>> 153
>> 154 // only select final state decay products (direct or via subsequent decays);
>> 155 // skip all others
>> 156 //
>> 157 // NOTE: in general, final state decays products will have
>> 158 // positive status code between 91 and 99
>> 159 // (in case such information could be of interest in the future)
>> 160 //
>> 161 if ( fDecayer->event[ip].status() < 0 ) continue;
>> 162
>> 163 // should we also skip neutrinos ???
>> 164 // if so, skip products with abs(fDecayer->event[ip].id()) of 12, 14, or 16
>> 165
>> 166 G4ParticleDefinition* pddec =
>> 167 G4ParticleTable::GetParticleTable()->FindParticle( fDecayer->event[ip].id() );
>> 168 if ( !pddec ) continue; // maybe we should print out a warning !
>> 169 G4ThreeVector momentum = G4ThreeVector( fDecayer->event[ip].px() * CLHEP::GeV,
>> 170 fDecayer->event[ip].py() * CLHEP::GeV,
>> 171 fDecayer->event[ip].pz() * CLHEP::GeV );
>> 172 dproducts->PushProducts( new G4DynamicParticle( pddec, momentum) );
>> 173 }
>> 174
>> 175 return dproducts;
98 176
99 // check if pdgid is consistent with Pythia8 <<
100 // <<
101 if (!fDecayer->particleData.findParticle(pdg <<
102 G4cout << " can NOT find pdgid = " << pdgi <<
103 return dproducts; <<
104 } <<
105 <<
106 if (!fDecayer->particleData.canDecay(pdgid)) <<
107 G4cout << " Particle of pdgid = " << pdgid <<
108 return dproducts; <<
109 } <<
110 <<
111 // NOTE: Energy should be in GeV <<
112 <<
113 fDecayer->event.append(pdgid, 1, 0, 0, track <<
114 track.GetMomentum().y <<
115 track.GetDynamicParti <<
116 pd->GetPDGMass() / CL <<
117 <<
118 // specify polarization, if any <<
119 <<
120 // NOTE: while in Py8 polarization is a doub <<
121 // in reality it's expected to be -1, <<
122 // similar to LHA SPINUP; see Particle <<
123 // https://pythia.org/manuals/pythia83 <<
124 // so it's not able to handle anything <<
125 fDecayer->event.back().pol( <<
126 round(std::cos(track.GetPolarization().ang <<
127 <<
128 int npart_before_decay = fDecayer->event.siz <<
129 <<
130 fDecayer->next(); <<
131 <<
132 int npart_after_decay = fDecayer->event.size <<
133 <<
134 // create & fill up decay products <<
135 // <<
136 dproducts = new G4DecayProducts(*(track.GetD <<
137 <<
138 // create G4DynamicParticle out of each fDec <<
139 // and push into dproducts <<
140 <<
141 for (int ip = npart_before_decay; ip < npart <<
142 // only select final state decay products <<
143 // skip all others <<
144 // <<
145 // NOTE: in general, final state decays pr <<
146 // positive status code between 91 a <<
147 // (in case such information could b <<
148 // <<
149 if (fDecayer->event[ip].status() < 0) cont <<
150 <<
151 // should we also skip neutrinos ??? <<
152 // if so, skip products with abs(fDecayer- <<
153 <<
154 G4ParticleDefinition* pddec = <<
155 G4ParticleTable::GetParticleTable()->Fin <<
156 if (!pddec) continue; // maybe we should <<
157 G4ThreeVector momentum = <<
158 G4ThreeVector(fDecayer->event[ip].px() * <<
159 fDecayer->event[ip].pz() * <<
160 dproducts->PushProducts(new G4DynamicParti <<
161 } <<
162 <<
163 return dproducts; <<
164 } 177 }
165 178
166 //....oooOO0OOooo........oooOO0OOooo........oo 179 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 180
167 181