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26 //
27 /// \file eventgenerator/pythia/decayer6/src/Pythia6.cc
28 /// \brief Implementation of the Pythia6 class
29
30 // ----------------------------------------------------------------------------
31 // According to TPythia6 class from Root:
32 // (The TPythia6 class is an interface class to F77 routines in Pythia6 //
33 // CERNLIB event generators, written by T.Sjostrand.)
34 // http://root.cern.ch/
35 // see http://root.cern.ch/root/License.html
36 //
37 // The complete Pythia6 documentation can be found at:
38 // http://home.thep.lu.se/~torbjorn/pythiaaux/recent.html
39 // ----------------------------------------------------------------------------
40
41 // ******************************************************************************
42 // ******************************************************************************
43 // ** **
44 // ** **
45 // ** *......* Welcome to the Lund Monte Carlo! **
46 // ** *:::!!:::::::::::* **
47 // ** *::::::!!::::::::::::::* PPP Y Y TTTTT H H III A **
48 // ** *::::::::!!::::::::::::::::* P P Y Y T H H I A A **
49 // ** *:::::::::!!:::::::::::::::::* PPP Y T HHHHH I AAAAA **
50 // ** *:::::::::!!:::::::::::::::::* P Y T H H I A A **
51 // ** *::::::::!!::::::::::::::::*! P Y T H H III A A **
52 // ** *::::::!!::::::::::::::* !! **
53 // ** !! *:::!!:::::::::::* !! This is PYTHIA version 6.418 **
54 // ** !! !* -><- * !! Last date of change: 9 Jun 2008 **
55 // ** !! !! !! **
56 // ** !! !! !! Now is 0 Jan 2000 at 0:00:00 **
57 // ** !! !! **
58 // ** !! lh !! Disclaimer: this program comes **
59 // ** !! !! without any guarantees. Beware **
60 // ** !! hh !! of errors and use common sense **
61 // ** !! ll !! when interpreting results. **
62 // ** !! !! **
63 // ** !! Copyright T. Sjostrand (2008) **
64 // ** **
65 // ** An archive of program versions and documentation is found on the web: **
66 // ** http://www.thep.lu.se/~torbjorn/Pythia.html **
67 // ** **
68 // ** When you cite this program, the official reference is to the 6.4 manual: **
69 // ** T. Sjostrand, S. Mrenna and P. Skands, JHEP05 (2006) 026 **
70 // ** (LU TP 06-13, FERMILAB-PUB-06-052-CD-T) [hep-ph/0603175]. **
71 // ** **
72 // ** Also remember that the program, to a large extent, represents original **
73 // ** physics research. Other publications of special relevance to your **
74 // ** studies may therefore deserve separate mention. **
75 // ** **
76 // ** Main author: Torbjorn Sjostrand; Department of Theoretical Physics, **
77 // ** Lund University, Solvegatan 14A, S-223 62 Lund, Sweden; **
78 // ** phone: + 46 - 46 - 222 48 16; e-mail: torbjorn@thep.lu.se **
79 // ** Author: Stephen Mrenna; Computing Division, GDS Group, **
80 // ** Fermi National Accelerator Laboratory, MS 234, Batavia, IL 60510, USA; **
81 // ** phone: + 1 - 630 - 840 - 2556; e-mail: mrenna@fnal.gov **
82 // ** Author: Peter Skands; Theoretical Physics Department, **
83 // ** Fermi National Accelerator Laboratory, MS 106, Batavia, IL 60510, USA; **
84 // ** and CERN/PH, CH-1211 Geneva, Switzerland; **
85 // ** phone: + 41 - 22 - 767 24 59; e-mail: skands@fnal.gov **
86 // ** **
87 // ** **
88 // ******************************************************************************
89
90 #include "Pythia6.hh"
91
92 #include <cstdlib>
93 #include <cstring>
94 #include <iostream>
95
96 #ifndef WIN32
97 # define pycomp pycomp_
98 # define py1ent py1ent_
99 # define type_of_call
100 #else
101 # define pycomp PYCOMP
102 # define py1ent PY1ENT
103 # define type_of_call _stdcall
104 #endif
105
106 // pythia6 functions
107 extern "C"
108 {
109 int type_of_call pycomp(int* kf);
110 void type_of_call py1ent(int&, int&, double&, double&, double&);
111 void* pythia6_common_address(const char*);
112 }
113
114 // Direct declaration of pythia6 common blocks
115 // extern "C" {
116 // extern Pyjets_t pyjets_;
117 // extern Pydat1_t pydat1_;
118 // extern Pydat3_t pydat3_;
119 // }
120
121 Pythia6* Pythia6::fgInstance = 0;
122
123 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
124
125 Pythia6* Pythia6::Instance()
126 {
127 /// Static access method
128
129 if (!fgInstance) fgInstance = new Pythia6();
130
131 return fgInstance;
132 }
133
134 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
135
136 Pythia6::Pythia6() : fParticles(0), fPyjets(0), fPydat1(0), fPydat3(0)
137 {
138 /// Pythia6 constructor: creates a vector of Pythia6Particle in which it will
139 /// store all particles. Note that there may be only one functional Pythia6
140 /// object at a time, so it's not use to create more than one instance of it.
141
142 // Protect against multiple objects. All access should be via the
143 // Instance member function.
144 if (fgInstance) {
145 std::cerr << "There's already an instance of Pythia6" << std::endl;
146 exit(1);
147 }
148
149 fParticles = new ParticleVector();
150
151 // Initialize common-blocks
152 fPyjets = (Pyjets_t*)pythia6_common_address("PYJETS");
153 fPydat1 = (Pydat1_t*)pythia6_common_address("PYDAT1");
154 fPydat3 = (Pydat3_t*)pythia6_common_address("PYDAT3");
155
156 // Alternative way to initialize common-blocks
157 // usind direct declaration of pythia6 common blocks
158 // fPyjets = &pyjets_;
159 // fPydat1 = &pydat1_;
160 // fPydat3 = &pydat3_;
161 }
162
163 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
164
165 Pythia6::~Pythia6()
166 {
167 /// Destroy the object, delete and dispose all Pythia6Particles currently on
168 /// list.
169
170 if (fParticles) {
171 ParticleVector::const_iterator it;
172 for (it = fParticles->begin(); it != fParticles->end(); it++)
173 delete *it;
174 delete fParticles;
175 }
176 }
177
178 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
179
180 int Pythia6::Pycomp(int kf)
181 {
182 /// Interface with fortran routine pycomp
183
184 return pycomp(&kf);
185 }
186
187 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
188
189 void Pythia6::Py1ent(int ip, int kf, double pe, double theta, double phi)
190 {
191 /// Add one entry to the event record, i.e. either a parton or a
192 /// particle.
193 ///
194 /// IP: normally line number for the parton/particle. There are two
195 /// exceptions:
196 ///
197 /// If IP = 0: line number 1 is used and PYEXEC is called.
198 /// If IP < 0: line -IP is used, with status code K(-IP,2)=2
199 /// rather than 1; thus a parton system may be built
200 /// up by filling all but the last parton of the
201 /// system with IP < 0.
202 /// KF: parton/particle flavour code (PDG code)
203 /// PE: parton/particle energy. If PE is smaller than the mass,
204 /// the parton/particle is taken to be at rest.
205 /// THETA:
206 /// PHI: polar and azimuthal angle for the momentum vector of the
207 /// parton/particle.
208
209 py1ent(ip, kf, pe, theta, phi);
210 }
211
212 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
213
214 int Pythia6::ImportParticles(ParticleVector* particles, const char* option)
215 {
216 /// Default primary creation method. It reads the /HEPEVT/ common block which
217 /// has been filled by the GenerateEvent method. If the event generator does
218 /// not use the HEPEVT common block, This routine has to be overloaded by
219 /// the subclasses.
220 /// The function loops on the generated particles and store them in
221 /// the TClonesArray pointed by the argument particles.
222 /// The default action is to store only the stable particles (ISTHEP = 1)
223 /// This can be demanded explicitly by setting the option = "Final"
224 /// If the option = "All", all the particles are stored.
225
226 if (particles == 0) return 0;
227
228 ParticleVector::const_iterator it;
229 for (it = particles->begin(); it != particles->end(); it++)
230 delete *it;
231 particles->clear();
232
233 int numpart = fPyjets->N;
234 int nparts = 0;
235 if (!strcmp(option, "") || !strcmp(option, "Final")) {
236 for (int i = 0; i < numpart; i++) {
237 if (fPyjets->K[0][i] == 1) {
238 //
239 // Use the common block values for the TParticle constructor
240 //
241 particles->push_back(new Pythia6Particle(
242 fPyjets->K[0][i], fPyjets->K[1][i], fPyjets->K[2][i], fPyjets->K[3][i], fPyjets->K[4][i],
243 fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i], fPyjets->P[4][i],
244 fPyjets->V[0][i], fPyjets->V[1][i], fPyjets->V[2][i], fPyjets->V[3][i],
245 fPyjets->V[4][i]));
246
247 // if(gDebug) printf("%d %d %d! ",i,fPyjets->K[1][i],numpart);
248 nparts++;
249 }
250 }
251 }
252 else if (!strcmp(option, "All")) {
253 for (int i = 0; i < numpart; i++) {
254 particles->push_back(new Pythia6Particle(
255 fPyjets->K[0][i], fPyjets->K[1][i], fPyjets->K[2][i], fPyjets->K[3][i], fPyjets->K[4][i],
256 fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i], fPyjets->P[4][i],
257 fPyjets->V[0][i], fPyjets->V[1][i], fPyjets->V[2][i], fPyjets->V[3][i], fPyjets->V[4][i]));
258 }
259 nparts = numpart;
260 }
261
262 return nparts;
263 }
264
265 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
266