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b584e2f5 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | // Author: Andreas Morsch 27/10/2007 | |
17 | //////////////////////////////////////////////////////////////////////////////// | |
18 | // // | |
19 | // TPythia8 // | |
20 | // // | |
21 | // TPythia is an interface class to C++ version of Pythia 8.1 // | |
22 | // event generators, written by T.Sjostrand. // | |
23 | // // | |
24 | // The user is assumed to be familiar with the Pythia package. // | |
25 | // This class includes only a basic interface to Pythia8. Because Pythia8 is // | |
26 | // also written in C++, its functions/classes can be called directly from a // | |
27 | // compiled C++ script. // | |
28 | // To call Pythia functions not available in this interface a dictionary must // | |
29 | // be generated. // | |
30 | // see $ROOTSYS/tutorials/pythia/pythia8.C for an example of use from CINT. // | |
31 | // // | |
32 | //////////////////////////////////////////////////////////////////////////////// | |
33 | /* | |
34 | *------------------------------------------------------------------------------------* | |
35 | | | | |
36 | | *------------------------------------------------------------------------------* | | |
37 | | | | | | |
38 | | | | | | |
39 | | | PPP Y Y TTTTT H H III A Welcome to the Lund Monte Carlo! | | | |
40 | | | P P Y Y T H H I A A This is PYTHIA version 8.100 | | | |
41 | | | PPP Y T HHHHH I AAAAA Last date of change: 20 Oct 2007 | | | |
42 | | | P Y T H H I A A | | | |
43 | | | P Y T H H III A A Now is 27 Oct 2007 at 18:26:53 | | | |
44 | | | | | | |
45 | | | Main author: Torbjorn Sjostrand; CERN/PH, CH-1211 Geneva, Switzerland, | | | |
46 | | | and Department of Theoretical Physics, Lund University, Lund, Sweden; | | | |
47 | | | phone: + 41 - 22 - 767 82 27; e-mail: torbjorn@thep.lu.se | | | |
48 | | | Author: Stephen Mrenna; Computing Division, Simulations Group, | | | |
49 | | | Fermi National Accelerator Laboratory, MS 234, Batavia, IL 60510, USA; | | | |
50 | | | phone: + 1 - 630 - 840 - 2556; e-mail: mrenna@fnal.gov | | | |
51 | | | Author: Peter Skands; CERN/PH, CH-1211 Geneva, Switzerland, | | | |
52 | | | and Theoretical Physics Department, | | | |
53 | | | Fermi National Accelerator Laboratory, MS 106, Batavia, IL 60510, USA; | | | |
54 | | | phone: + 41 - 22 - 767 24 59; e-mail: skands@fnal.gov | | | |
55 | | | | | | |
56 | | | The main program reference is the 'Brief Introduction to PYTHIA 8.1', | | | |
57 | | | T. Sjostrand, S. Mrenna and P. Skands, arXiv:0710.3820 | | | |
58 | | | | | | |
59 | | | The main physics reference is the 'PYTHIA 6.4 Physics and Manual', | | | |
60 | | | T. Sjostrand, S. Mrenna and P. Skands, JHEP05 (2006) 026 [hep-ph/0603175]. | | | |
61 | | | | | | |
62 | | | An archive of program versions and documentation is found on the web: | | | |
63 | | | http://www.thep.lu.se/~torbjorn/Pythia.html | | | |
64 | | | | | | |
65 | | | This program is released under the GNU General Public Licence version 2. | | | |
66 | | | Please respect the MCnet Guidelines for Event Generator Authors and Users. | | | |
67 | | | | | | |
68 | | | Disclaimer: this program comes without any guarantees. | | | |
69 | | | Beware of errors and use common sense when interpreting results. | | | |
70 | | | | | | |
71 | | | Copyright (C) 2007 Torbjorn Sjostrand | | | |
72 | | | | | | |
73 | | | | | | |
74 | | *------------------------------------------------------------------------------* | | |
75 | | | | |
76 | *------------------------------------------------------------------------------------* | |
77 | */ | |
78 | ||
79 | #include "AliTPythia8.h" | |
80 | ||
81 | #include "TClonesArray.h" | |
82 | #include "TParticle.h" | |
83 | #include "TDatabasePDG.h" | |
84 | #include "TLorentzVector.h" | |
85 | ||
86 | ClassImp(AliTPythia8) | |
87 | ||
88 | AliTPythia8* AliTPythia8::fgInstance = 0; | |
89 | ||
90 | //___________________________________________________________________________ | |
91 | AliTPythia8::AliTPythia8(): | |
92 | TGenerator("AliTPythia8", "AliTPythia8"), | |
93 | fPythia(0), | |
94 | fNumberOfParticles(0) | |
95 | { | |
96 | // Constructor | |
97 | if (fgInstance) | |
98 | Fatal("AliTPythia8", "There's already an instance of AliTPythia8"); | |
99 | ||
100 | delete fParticles; // was allocated as TObjArray in TGenerator | |
101 | ||
102 | fParticles = new TClonesArray("TParticle",50); | |
103 | fPythia = new Pythia8::Pythia(); | |
104 | } | |
105 | ||
106 | //___________________________________________________________________________ | |
107 | AliTPythia8::AliTPythia8(const char *xmlDir): | |
108 | TGenerator("AliTPythia8", "AliTPythia8"), | |
109 | fPythia(0), | |
110 | fNumberOfParticles(0) | |
111 | { | |
112 | // Constructor with an xmlDir (eg "../xmldoc" | |
113 | if (fgInstance) | |
114 | Fatal("AliTPythia8", "There's already an instance of AliTPythia8"); | |
115 | ||
116 | delete fParticles; // was allocated as TObjArray in TGenerator | |
117 | ||
118 | fParticles = new TClonesArray("TParticle",50); | |
119 | fPythia = new Pythia8::Pythia(xmlDir); | |
120 | } | |
121 | ||
122 | //___________________________________________________________________________ | |
123 | AliTPythia8::~AliTPythia8() | |
124 | { | |
125 | // Destructor | |
126 | if (fParticles) { | |
127 | fParticles->Delete(); | |
128 | delete fParticles; | |
129 | fParticles = 0; | |
130 | } | |
131 | delete fPythia; | |
132 | } | |
133 | ||
134 | //___________________________________________________________________________ | |
135 | AliTPythia8* AliTPythia8::Instance() | |
136 | { | |
137 | // Return an instance of AliTPythia8 | |
138 | return fgInstance ? fgInstance : (fgInstance = new AliTPythia8()) ; | |
139 | } | |
140 | ||
141 | //___________________________________________________________________________ | |
142 | Bool_t AliTPythia8::Initialize(Int_t idAin, Int_t idBin, Double_t ecms) | |
143 | { | |
144 | // Initialization | |
145 | AddParticlesToPdgDataBase(); | |
146 | return fPythia->init(idAin, idBin, ecms); | |
147 | } | |
148 | ||
149 | //___________________________________________________________________________ | |
150 | void AliTPythia8::GenerateEvent() | |
151 | { | |
152 | // Generate the next event | |
153 | fPythia->next(); | |
154 | fNumberOfParticles = fPythia->event.size() - 1; | |
155 | ImportParticles(); | |
156 | } | |
157 | ||
158 | //___________________________________________________________________________ | |
159 | Int_t AliTPythia8::ImportParticles(TClonesArray *particles, Option_t *option) | |
160 | { | |
161 | // Import particles from Pythia stack | |
162 | if (particles == 0) return 0; | |
163 | TClonesArray &clonesParticles = *particles; | |
164 | clonesParticles.Clear(); | |
165 | Int_t nparts=0; | |
166 | Int_t i; | |
25131802 | 167 | Int_t ioff = 0; |
168 | fNumberOfParticles = fPythia->event.size(); | |
169 | if (fPythia->event[0].id() == 90) { | |
170 | fNumberOfParticles--; | |
171 | ioff = -1; | |
172 | } | |
b584e2f5 | 173 | |
174 | if (!strcmp(option,"") || !strcmp(option,"Final")) { | |
25131802 | 175 | for (i = 0; i < fNumberOfParticles; i++) { |
b584e2f5 | 176 | if (fPythia->event[i].id() == 90) continue; |
177 | if (fPythia->event[i].isFinal()) { | |
178 | new(clonesParticles[nparts]) TParticle( | |
179 | fPythia->event[i].id(), | |
180 | fPythia->event[i].isFinal(), | |
25131802 | 181 | fPythia->event[i].mother1() + ioff, |
182 | fPythia->event[i].mother2() + ioff, | |
183 | fPythia->event[i].daughter1() + ioff, | |
184 | fPythia->event[i].daughter2() + ioff, | |
b584e2f5 | 185 | fPythia->event[i].px(), // [GeV/c] |
186 | fPythia->event[i].py(), // [GeV/c] | |
187 | fPythia->event[i].pz(), // [GeV/c] | |
188 | fPythia->event[i].e(), // [GeV] | |
189 | fPythia->event[i].xProd(), // [mm] | |
190 | fPythia->event[i].yProd(), // [mm] | |
191 | fPythia->event[i].zProd(), // [mm] | |
192 | fPythia->event[i].tProd()); // [mm/c] | |
193 | nparts++; | |
194 | } // final state partice | |
195 | } // particle loop | |
196 | } else if (!strcmp(option,"All")) { | |
25131802 | 197 | for (i = 0; i < fNumberOfParticles; i++) { |
b584e2f5 | 198 | if (fPythia->event[i].id() == 90) continue; |
199 | new(clonesParticles[nparts]) TParticle( | |
200 | fPythia->event[i].id(), | |
201 | fPythia->event[i].isFinal(), | |
25131802 | 202 | fPythia->event[i].mother1() + ioff, |
203 | fPythia->event[i].mother2() + ioff, | |
204 | fPythia->event[i].daughter1() + ioff, | |
205 | fPythia->event[i].daughter2() + ioff, | |
b584e2f5 | 206 | fPythia->event[i].px(), // [GeV/c] |
207 | fPythia->event[i].py(), // [GeV/c] | |
208 | fPythia->event[i].pz(), // [GeV/c] | |
209 | fPythia->event[i].e(), // [GeV] | |
210 | fPythia->event[i].xProd(), // [mm] | |
211 | fPythia->event[i].yProd(), // [mm] | |
212 | fPythia->event[i].zProd(), // [mm] | |
213 | fPythia->event[i].tProd()); // [mm/c] | |
214 | nparts++; | |
215 | } // particle loop | |
216 | } | |
217 | return nparts; | |
218 | } | |
219 | ||
220 | //___________________________________________________________________________ | |
221 | TObjArray* AliTPythia8::ImportParticles(Option_t* /* option */) | |
222 | { | |
223 | // Import particles from Pythia stack | |
224 | fParticles->Clear(); | |
25131802 | 225 | Int_t ioff = 0; |
226 | Int_t numpart = fPythia->event.size(); | |
227 | if (fPythia->event[0].id() == 90) { | |
228 | numpart--; | |
229 | ioff = -1; | |
230 | } | |
231 | ||
232 | ||
b584e2f5 | 233 | TClonesArray &a = *((TClonesArray*)fParticles); |
234 | for (Int_t i = 1; i <= numpart; i++) { | |
235 | new(a[i]) TParticle( | |
236 | fPythia->event[i].id(), | |
237 | fPythia->event[i].isFinal(), | |
25131802 | 238 | fPythia->event[i].mother1() + ioff, |
239 | fPythia->event[i].mother2() + ioff, | |
240 | fPythia->event[i].daughter1() + ioff, | |
241 | fPythia->event[i].daughter2() + ioff, | |
b584e2f5 | 242 | fPythia->event[i].px(), // [GeV/c] |
243 | fPythia->event[i].py(), // [GeV/c] | |
244 | fPythia->event[i].pz(), // [GeV/c] | |
245 | fPythia->event[i].e(), // [GeV] | |
246 | fPythia->event[i].xProd(), // [mm] | |
247 | fPythia->event[i].yProd(), // [mm] | |
248 | fPythia->event[i].zProd(), // [mm] | |
249 | fPythia->event[i].tProd()); // [mm/c] | |
250 | } | |
251 | return fParticles; | |
252 | } | |
253 | ||
254 | //___________________________________________________________________________ | |
255 | Int_t AliTPythia8::GetN() const | |
256 | { | |
257 | // Initialization | |
258 | return (fPythia->event.size() - 1); | |
259 | } | |
260 | ||
261 | //___________________________________________________________________________ | |
262 | void AliTPythia8::ReadString(const char* string) const | |
263 | { | |
264 | // Configuration | |
265 | fPythia->readString(string); | |
266 | } | |
267 | ||
268 | //___________________________________________________________________________ | |
269 | void AliTPythia8::ReadConfigFile(const char* string) const | |
270 | { | |
271 | // Configuration | |
272 | fPythia->readFile(string); | |
273 | } | |
274 | ||
275 | //___________________________________________________________________________ | |
276 | void AliTPythia8::PrintStatistics() const | |
277 | { | |
278 | // Print end of run statistics | |
279 | fPythia->statistics(); | |
280 | } | |
281 | ||
282 | //___________________________________________________________________________ | |
283 | void AliTPythia8::EventListing() const | |
284 | { | |
285 | // Event listing | |
286 | fPythia->event.list(); | |
287 | } | |
288 | ||
289 | //___________________________________________________________________________ | |
c014d45a | 290 | void AliTPythia8::AddParticlesToPdgDataBase() const |
b584e2f5 | 291 | { |
292 | // Add some pythia specific particle code to the data base | |
293 | ||
294 | TDatabasePDG *pdgDB = TDatabasePDG::Instance(); | |
295 | pdgDB->AddParticle("string","string", 0, kTRUE, | |
296 | 0, 0, "QCD string", 90); | |
297 | pdgDB->AddParticle("rho_diff0", "rho_diff0", 0, kTRUE, | |
298 | 0, 0, "QCD diffr. state", 9900110); | |
299 | pdgDB->AddParticle("pi_diffr+", "pi_diffr+", 0, kTRUE, | |
300 | 0, 1, "QCD diffr. state", 9900210); | |
301 | pdgDB->AddParticle("omega_di", "omega_di", 0, kTRUE, | |
302 | 0, 0, "QCD diffr. state", 9900220); | |
303 | pdgDB->AddParticle("phi_diff","phi_diff", 0, kTRUE, | |
304 | 0, 0, "QCD diffr. state", 9900330); | |
305 | pdgDB->AddParticle("J/psi_di", "J/psi_di", 0, kTRUE, | |
306 | 0, 0, "QCD diffr. state", 9900440); | |
307 | pdgDB->AddParticle("n_diffr0","n_diffr0",0,kTRUE, | |
308 | 0, 0, "QCD diffr. state", 9902110); | |
309 | pdgDB->AddParticle("p_diffr+","p_diffr+", 0, kTRUE, | |
310 | 0, 1, "QCD diffr. state", 9902210); | |
311 | } | |
312 |