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45575004 | 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 | ||
6aff9852 | 16 | // $Id: AliCollider.cxx,v 1.9 2004/01/12 08:23:22 nick Exp $ |
fdbea0ce | 17 | |
18 | /////////////////////////////////////////////////////////////////////////// | |
19 | // Class AliCollider | |
20 | // Pythia based universal physics event generator. | |
4b570fab | 21 | // This class is derived from TPythia6 and has some extensions to |
fdbea0ce | 22 | // support also generation of nucleus-nucleus interactions and to allow |
23 | // investigation of the effect of detector resolving power. | |
24 | // Furthermore, the produced event information is provided in a format | |
25 | // using the AliEvent structure. | |
26 | // For the produced AliTrack objects, the particle ID code is set to the | |
27 | // Pythia KF value, which is compatible with the PDG identifier. | |
28 | // This will allow a direct analysis of the produced data using the | |
29 | // Ralice physics analysis tools. | |
30 | // | |
31 | // For further details concerning the produced output structure, | |
32 | // see the docs of the memberfunctions SetVertexMode and SetResolution. | |
33 | // | |
34 | // Example job of minimum biased Pb+Pb interactions : | |
35 | // -------------------------------------------------- | |
36 | // { | |
37 | // gSystem->Load("libEG"); | |
38 | // gSystem->Load("libEGPythia6"); | |
39 | // gSystem->Load("ralice"); | |
40 | // | |
41 | // AliCollider* gen=new AliCollider(); | |
42 | // | |
43 | // gen->SetOutputFile("test.root"); | |
44 | // gen->SetVertexMode(3); | |
45 | // gen->SetResolution(1e-4); // 1 micron vertex resolution | |
46 | // | |
47 | // gen->SetRunNumber(1); | |
48 | // | |
49 | // Int_t zp=82; | |
50 | // Int_t ap=208; | |
51 | // Int_t zt=82; | |
52 | // Int_t at=208; | |
53 | // | |
54 | // gen->Init("fixt",zp,ap,zt,at,158); | |
55 | // | |
47dddbe4 | 56 | // gen->SetTitle("SPS Pb-Pb collision at 158A GeV/c beam energy"); |
57 | // | |
fdbea0ce | 58 | // Int_t nevents=5; |
59 | // | |
60 | // AliRandom rndm; | |
61 | // Float_t* rans=new Float_t[nevents]; | |
62 | // rndm.Uniform(rans,nevents,2,ap+at); | |
63 | // Int_t npart; | |
64 | // for (Int_t i=0; i<nevents; i++) | |
65 | // { | |
66 | // npart=rans[i]; | |
67 | // gen->MakeEvent(npart); | |
68 | // | |
69 | // AliEvent* evt=gen->GetEvent(); | |
70 | // | |
71 | // evt->List(); | |
72 | // } | |
73 | // | |
74 | // gen->EndRun(); | |
75 | // } | |
76 | // | |
77 | // | |
78 | // Example job of a cosmic nu+p atmospheric interaction. | |
79 | // ----------------------------------------------------- | |
80 | // { | |
81 | // gSystem->Load("libEG"); | |
82 | // gSystem->Load("libEGPythia6"); | |
83 | // gSystem->Load("ralice"); | |
84 | // | |
85 | // AliCollider* gen=new AliCollider(); | |
86 | // | |
87 | // gen->SetOutputFile("test.root"); | |
88 | // | |
89 | // gen->SetRunNumber(1); | |
90 | // | |
91 | // gen->Init("fixt","nu_mu","p",1e11); | |
92 | // | |
47dddbe4 | 93 | // gen->SetTitle("Atmospheric nu_mu-p interaction at 1e20 eV"); |
94 | // | |
fdbea0ce | 95 | // Int_t nevents=10; |
96 | // | |
97 | // for (Int_t i=0; i<nevents; i++) | |
98 | // { | |
99 | // gen->MakeEvent(0,1); | |
100 | // | |
101 | // AliEvent* evt=gen->GetEvent(); | |
102 | // | |
84bb7c66 | 103 | // evt->Data(); |
fdbea0ce | 104 | // } |
105 | // | |
106 | // gen->EndRun(); | |
107 | // } | |
108 | // | |
109 | // | |
110 | //--- Author: Nick van Eijndhoven 22-nov-2002 Utrecht University | |
6aff9852 | 111 | //- Modified: NvE $Date: 2004/01/12 08:23:22 $ Utrecht University |
fdbea0ce | 112 | /////////////////////////////////////////////////////////////////////////// |
113 | ||
114 | #include "AliCollider.h" | |
c72198f1 | 115 | #include "Riostream.h" |
fdbea0ce | 116 | |
117 | ClassImp(AliCollider) // Class implementation to enable ROOT I/O | |
118 | ||
c72198f1 | 119 | AliCollider::AliCollider() : TPythia6() |
fdbea0ce | 120 | { |
121 | // Default constructor. | |
122 | // All variables initialised to default values. | |
123 | fVertexmode=0; // No vertex structure creation | |
124 | fResolution=1e-5; // Standard resolution is 0.1 micron | |
125 | fRunnum=0; | |
126 | fEventnum=0; | |
127 | fPrintfreq=1; | |
128 | ||
129 | fEvent=0; | |
130 | ||
47dddbe4 | 131 | fSpecpmin=0; |
132 | ||
fdbea0ce | 133 | fFrame="none"; |
134 | fWin=0; | |
135 | ||
136 | fNucl=0; | |
137 | fZproj=0; | |
138 | fAproj=0; | |
139 | fZtarg=0; | |
140 | fAtarg=0; | |
141 | fFracpp=0; | |
142 | fFracnp=0; | |
143 | fFracpn=0; | |
144 | fFracnn=0; | |
145 | ||
146 | fOutFile=0; | |
147 | fOutTree=0; | |
47dddbe4 | 148 | |
149 | fSelections=0; | |
150 | fSelect=0; | |
151 | ||
152 | TString s=GetName(); | |
153 | s+=" (AliCollider)"; | |
154 | SetName(s.Data()); | |
fdbea0ce | 155 | } |
156 | /////////////////////////////////////////////////////////////////////////// | |
157 | AliCollider::~AliCollider() | |
158 | { | |
159 | // Default destructor | |
160 | if (fEvent) | |
161 | { | |
162 | delete fEvent; | |
163 | fEvent=0; | |
164 | } | |
165 | if (fOutFile) | |
166 | { | |
167 | delete fOutFile; | |
168 | fOutFile=0; | |
169 | } | |
170 | if (fOutTree) | |
171 | { | |
172 | delete fOutTree; | |
173 | fOutTree=0; | |
174 | } | |
47dddbe4 | 175 | if (fSelections) |
176 | { | |
177 | delete fSelections; | |
178 | fSelections=0; | |
179 | } | |
fdbea0ce | 180 | } |
181 | /////////////////////////////////////////////////////////////////////////// | |
182 | void AliCollider::SetOutputFile(TString s) | |
183 | { | |
184 | // Create the output file containing all the data in ROOT output format. | |
185 | if (fOutFile) | |
186 | { | |
187 | delete fOutFile; | |
188 | fOutFile=0; | |
189 | } | |
190 | fOutFile=new TFile(s.Data(),"RECREATE","AliCollider data"); | |
191 | ||
192 | if (fOutTree) | |
193 | { | |
194 | delete fOutTree; | |
195 | fOutTree=0; | |
196 | } | |
197 | fOutTree=new TTree("T","AliCollider event data"); | |
198 | ||
199 | Int_t bsize=32000; | |
200 | Int_t split=0; | |
201 | fOutTree->Branch("Events","AliEvent",&fEvent,bsize,split); | |
202 | } | |
203 | /////////////////////////////////////////////////////////////////////////// | |
204 | void AliCollider::SetVertexMode(Int_t mode) | |
205 | { | |
206 | // Set the mode of the vertex structure creation. | |
207 | // | |
208 | // By default all generated tracks will only appear in the AliEvent | |
209 | // structure without any primary (and secondary) vertex structure. | |
210 | // The user can build the vertex structure if he/she wants by means | |
211 | // of the beginpoint location of each AliTrack. | |
212 | // | |
213 | // However, one can also let AliCollider automatically create | |
214 | // the primary (and secondary) vertex structure(s). | |
215 | // In this case the primary vertex is given Id=1 and all sec. vertices | |
216 | // are given Id's 2,3,4,.... | |
217 | // All vertices are created as standalone entities in the AliEvent structure | |
218 | // without any linking between the various vertices. | |
219 | // For this automated process, the user-selected resolution | |
220 | // (see SetResolution) is used to decide whether or not certain vertex | |
221 | // locations can be resolved. | |
222 | // In case no vertex creation is selected (i.e. the default mode=0), | |
223 | // the value of the resolution is totally irrelevant. | |
224 | // | |
225 | // The user can also let AliCollider automatically connect the sec. vertices | |
226 | // to the primary vertex (i.e. mode=3). This process will also automatically | |
227 | // generate the tracks connecting the vertices. | |
228 | // Note that the result of the mode=3 operation may be very sensitive to | |
229 | // the resolution parameter. Therefore, no attempt is made to distinguish | |
230 | // between secondary, tertiary etc... vertices. All sec. vertices are | |
231 | // linked to the primary one. | |
232 | // | |
233 | // Irrespective of the selected mode, all generated tracks can be obtained | |
234 | // directly from the AliEvent structure. | |
235 | // In case (sec.) vertex creation is selected, all generated vertices can | |
236 | // also be obtained directly from the AliEvent structure. | |
237 | // These (sec.) vertices contain only the corresponding pointers to the various | |
238 | // tracks which are stored in the AliEvent structure. | |
239 | // | |
240 | // Overview of vertex creation modes : | |
241 | // ----------------------------------- | |
242 | // mode = 0 ==> No vertex structure will be created | |
243 | // 1 ==> Only primary vertex structure will be created | |
244 | // 2 ==> Unconnected primary and secondary vertices will be created | |
245 | // 3 ==> Primary and secondary vertices will be created where all the | |
246 | // sec. vertices will be connected to the primary vertex. | |
247 | // Also the vertex connecting tracks will be automatically | |
248 | // generated. | |
249 | // | |
250 | if (mode<0 || mode >3) | |
251 | { | |
252 | cout << " *AliCollider::SetVertexMode* Invalid argument mode : " << mode << endl; | |
253 | fVertexmode=0; | |
254 | } | |
255 | else | |
256 | { | |
257 | fVertexmode=mode; | |
258 | } | |
259 | } | |
260 | /////////////////////////////////////////////////////////////////////////// | |
261 | Int_t AliCollider::GetVertexMode() | |
262 | { | |
263 | // Provide the current mode for vertex structure creation. | |
264 | return fVertexmode; | |
265 | } | |
266 | /////////////////////////////////////////////////////////////////////////// | |
267 | void AliCollider::SetResolution(Double_t res) | |
268 | { | |
269 | // Set the resolution (in cm) for resolving (sec.) vertices. | |
270 | // By default this resolution is set to 0.1 micron. | |
271 | // Note : In case no vertex creation has been selected, the value of | |
272 | // the resolution is totally irrelevant. | |
273 | fResolution=fabs(res); | |
274 | } | |
275 | /////////////////////////////////////////////////////////////////////////// | |
276 | Double_t AliCollider::GetResolution() | |
277 | { | |
278 | // Provide the current resolution (in cm) for resolving (sec.) vertices. | |
279 | return fResolution; | |
280 | } | |
281 | /////////////////////////////////////////////////////////////////////////// | |
282 | void AliCollider::SetRunNumber(Int_t run) | |
283 | { | |
284 | // Set the user defined run number. | |
285 | // By default the run number is set to 0. | |
286 | fRunnum=run; | |
287 | } | |
288 | /////////////////////////////////////////////////////////////////////////// | |
289 | Int_t AliCollider::GetRunNumber() | |
290 | { | |
291 | // Provide the user defined run number. | |
292 | return fRunnum; | |
293 | } | |
294 | /////////////////////////////////////////////////////////////////////////// | |
295 | void AliCollider::SetPrintFreq(Int_t n) | |
296 | { | |
297 | // Set the print frequency for every 'n' events. | |
298 | // By default the printfrequency is set to 1 (i.e. every event). | |
299 | fPrintfreq=n; | |
300 | } | |
301 | /////////////////////////////////////////////////////////////////////////// | |
302 | Int_t AliCollider::GetPrintFreq() | |
303 | { | |
304 | // Provide the user selected print frequency. | |
305 | return fPrintfreq; | |
306 | } | |
307 | /////////////////////////////////////////////////////////////////////////// | |
308 | void AliCollider::Init(char* frame,char* beam,char* target,Float_t win) | |
309 | { | |
310 | // Initialisation of the underlying Pythia generator package. | |
311 | // This routine just invokes TPythia6::Initialize(...) and the arguments | |
312 | // have the corresponding meaning. | |
313 | // The event number is reset to 0. | |
314 | fEventnum=0; | |
315 | fNucl=0; | |
316 | fFrame=frame; | |
317 | fWin=win; | |
318 | Initialize(frame,beam,target,win); | |
c72198f1 | 319 | |
320 | cout << " *AliCollider::Init* Standard Pythia initialisation." << endl; | |
321 | cout << " Beam particle : " << beam << " Target particle : " << target | |
322 | << " Frame = " << frame << " Energy = " << win | |
323 | << endl; | |
fdbea0ce | 324 | } |
325 | /////////////////////////////////////////////////////////////////////////// | |
326 | void AliCollider::Init(char* frame,Int_t zp,Int_t ap,Int_t zt,Int_t at,Float_t win) | |
327 | { | |
328 | // Initialisation of the underlying Pythia generator package for the generation | |
329 | // of nucleus-nucleus interactions. | |
330 | // In addition to the Pythia standard arguments 'frame' and 'win', the user | |
da17f667 | 331 | // can specify here (Z,A) values of the projectile and target nuclei. |
332 | // | |
333 | // Note : The 'win' value denotes either the cms energy per nucleon-nucleon collision | |
334 | // (i.e. frame="cms") or the momentum per nucleon in all other cases. | |
335 | // | |
fdbea0ce | 336 | // The event number is reset to 0. |
337 | fEventnum=0; | |
338 | fNucl=1; | |
339 | fFrame=frame; | |
340 | fWin=win; | |
341 | fZproj=0; | |
342 | fAproj=0; | |
343 | fZtarg=0; | |
344 | fAtarg=0; | |
345 | fFracpp=0; | |
346 | fFracnp=0; | |
347 | fFracpn=0; | |
348 | fFracnn=0; | |
349 | ||
350 | if (ap<1 || at<1 || zp>ap || zt>at) | |
351 | { | |
352 | cout << " *AliCollider::Init* Invalid input value(s). Zproj = " << zp | |
353 | << " Aproj = " << ap << " Ztarg = " << zt << " Atarg = " << at << endl; | |
354 | return; | |
355 | } | |
356 | ||
357 | fZproj=zp; | |
358 | fAproj=ap; | |
359 | fZtarg=zt; | |
360 | fAtarg=at; | |
361 | ||
362 | cout << " *AliCollider::Init* Nucleus-Nucleus generator initialisation." << endl; | |
363 | cout << " Zproj = " << zp << " Aproj = " << ap << " Ztarg = " << zt << " Atarg = " << at | |
364 | << " Frame = " << frame << " Energy = " << win | |
365 | << endl; | |
366 | } | |
367 | /////////////////////////////////////////////////////////////////////////// | |
368 | void AliCollider::GetFractions(Float_t zp,Float_t ap,Float_t zt,Float_t at) | |
369 | { | |
370 | // Determine the fractions for the various N-N collision processes. | |
371 | // The various processes are : p+p, n+p, p+n and n+n. | |
372 | if (zp<0) zp=0; | |
373 | if (zt<0) zt=0; | |
374 | ||
375 | fFracpp=0; | |
376 | fFracnp=0; | |
377 | fFracpn=0; | |
378 | fFracnn=0; | |
379 | ||
380 | if (ap>0 && at>0) | |
381 | { | |
382 | fFracpp=(zp/ap)*(zt/at); | |
383 | fFracnp=(1.-zp/ap)*(zt/at); | |
384 | fFracpn=(zp/ap)*(1.-zt/at); | |
385 | fFracnn=(1.-zp/ap)*(1.-zt/at); | |
386 | } | |
387 | } | |
388 | /////////////////////////////////////////////////////////////////////////// | |
389 | void AliCollider::MakeEvent(Int_t npt,Int_t mlist,Int_t medit) | |
390 | { | |
391 | // Generate one event. | |
392 | // In case of a nucleus-nucleus interaction, the argument 'npt' denotes | |
393 | // the number of participant nucleons. | |
47dddbe4 | 394 | // Normally also the spectator tracks will be stored into the event structure. |
395 | // The spectator tracks have a negative user Id to distinguish them from the | |
396 | // ordinary generated tracks. | |
397 | // In case the user has selected the creation of vertex structures, the spectator | |
398 | // tracks will be linked to the primary vertex. | |
399 | // However, specification of npt<0 will suppress the storage of spectator tracks. | |
400 | // In the latter case abs(npt) will be taken as the number of participants. | |
fdbea0ce | 401 | // In case of a standard Pythia run for 'elementary' particle interactions, |
402 | // the value of npt is totally irrelevant. | |
da17f667 | 403 | // |
fdbea0ce | 404 | // The argument 'mlist' denotes the list mode used for Pylist(). |
da17f667 | 405 | // Note : mlist<0 suppresses the invokation of Pylist(). |
406 | // By default, no listing is produced (i.e. mlist=-1). | |
407 | // | |
c72198f1 | 408 | // The argument 'medit' denotes the edit mode used for Pyedit(). |
409 | // Note : medit<0 suppresses the invokation of Pyedit(). | |
410 | // By default, only 'stable' final particles are kept (i.e. medit=1). | |
411 | // | |
da17f667 | 412 | // In the case of a standard Pythia run concerning 'elementary' particle |
413 | // interactions, the projectile and target particle ID's for the created | |
414 | // event structure are set to the corresponding Pythia KF codes. | |
415 | // All the A and Z values are in that case set to zero. | |
416 | // In case of a nucleus-nucleus interaction, the proper A and Z values for | |
417 | // the projectile and target particles are set in the event structure. | |
418 | // However, in this case both particle ID's are set to zero. | |
47dddbe4 | 419 | // |
420 | // Note : Only in case an event passed the selection criteria as specified | |
421 | // via SelectEvent(), the event will appear on the output file. | |
fdbea0ce | 422 | |
423 | fEventnum++; | |
424 | ||
47dddbe4 | 425 | Int_t specmode=1; |
426 | if (npt<0) | |
427 | { | |
428 | specmode=0; | |
429 | npt=abs(npt); | |
430 | } | |
431 | ||
fdbea0ce | 432 | // Counters for the various (proj,targ) combinations : p+p, n+p, p+n and n+n |
433 | Int_t ncols[4]={0,0,0,0}; | |
434 | ||
47dddbe4 | 435 | Int_t zp=0; |
436 | Int_t ap=0; | |
437 | Int_t zt=0; | |
438 | Int_t at=0; | |
439 | ||
c72198f1 | 440 | Int_t ncol=1; |
fdbea0ce | 441 | if (fNucl) |
442 | { | |
443 | if (npt<1 || npt>(fAproj+fAtarg)) | |
444 | { | |
445 | cout << " *AliCollider::MakeEvent* Invalid input value. npt = " << npt | |
446 | << " Aproj = " << fAproj << " Atarg = " << fAtarg << endl; | |
447 | return; | |
448 | } | |
449 | ||
450 | // Determine the number of nucleon-nucleon collisions | |
c72198f1 | 451 | ncol=npt/2; |
fdbea0ce | 452 | if (npt%2 && fRan.Uniform()>0.5) ncol+=1; |
453 | ||
454 | // Determine the number of the various types of N+N interactions | |
47dddbe4 | 455 | zp=fZproj; |
456 | ap=fAproj; | |
457 | zt=fZtarg; | |
458 | at=fAtarg; | |
fdbea0ce | 459 | Int_t maxa=2; // Indicator whether proj (1) or target (2) has maximal A left |
460 | if (ap>at) maxa=1; | |
461 | Float_t* rans=new Float_t[ncol]; | |
462 | fRan.Uniform(rans,ncol); | |
463 | Float_t rndm=0; | |
464 | for (Int_t i=0; i<ncol; i++) | |
465 | { | |
466 | GetFractions(zp,ap,zt,at); | |
467 | rndm=rans[i]; | |
468 | if (rndm<=fFracpp) // p+p interaction | |
469 | { | |
470 | ncols[0]++; | |
4b570fab | 471 | if (maxa==2) |
fdbea0ce | 472 | { |
473 | at--; | |
474 | zt--; | |
475 | } | |
476 | else | |
477 | { | |
478 | ap--; | |
479 | zp--; | |
480 | } | |
481 | } | |
482 | if (rndm>fFracpp && rndm<=(fFracpp+fFracnp)) // n+p interaction | |
483 | { | |
484 | ncols[1]++; | |
4b570fab | 485 | if (maxa==2) |
fdbea0ce | 486 | { |
487 | at--; | |
488 | zt--; | |
489 | } | |
490 | else | |
491 | { | |
492 | ap--; | |
493 | } | |
494 | } | |
495 | if (rndm>(fFracpp+fFracnp) && rndm<=(fFracpp+fFracnp+fFracpn)) // p+n interaction | |
496 | { | |
497 | ncols[2]++; | |
4b570fab | 498 | if (maxa==2) |
fdbea0ce | 499 | { |
500 | at--; | |
501 | } | |
502 | else | |
503 | { | |
504 | ap--; | |
505 | zp--; | |
506 | } | |
507 | } | |
508 | if (rndm>(fFracpp+fFracnp+fFracpn)) // n+n interaction | |
509 | { | |
510 | ncols[3]++; | |
4b570fab | 511 | if (maxa==2) |
fdbea0ce | 512 | { |
513 | at--; | |
514 | } | |
515 | else | |
516 | { | |
517 | ap--; | |
518 | } | |
519 | } | |
520 | } | |
521 | delete [] rans; | |
c72198f1 | 522 | } |
fdbea0ce | 523 | |
1c01b4f8 | 524 | if (!(fEventnum%fPrintfreq)) |
525 | { | |
526 | cout << " *AliCollider::MakeEvent* Run : " << fRunnum << " Event : " << fEventnum | |
527 | << endl; | |
528 | if (fNucl) | |
fdbea0ce | 529 | { |
1c01b4f8 | 530 | cout << " npart = " << npt << " ncol = " << ncol |
531 | << " ncolpp = " << ncols[0] << " ncolnp = " << ncols[1] | |
532 | << " ncolpn = " << ncols[2] << " ncolnn = " << ncols[3] << endl; | |
fdbea0ce | 533 | } |
1c01b4f8 | 534 | } |
fdbea0ce | 535 | |
fdbea0ce | 536 | if (!fEvent) |
537 | { | |
538 | fEvent=new AliEvent(); | |
539 | fEvent->SetOwner(); | |
47dddbe4 | 540 | fEvent->SetName(GetName()); |
541 | fEvent->SetTitle(GetTitle()); | |
fdbea0ce | 542 | } |
543 | ||
544 | fEvent->Reset(); | |
545 | fEvent->SetRunNumber(fRunnum); | |
546 | fEvent->SetEventNumber(fEventnum); | |
547 | ||
da17f667 | 548 | AliTrack t; |
549 | Ali3Vector p; | |
550 | AliPosition r,rx; | |
551 | Float_t v[3]; | |
fdbea0ce | 552 | AliVertex vert; |
47dddbe4 | 553 | Ali3Vector pproj,ptarg; |
da17f667 | 554 | |
fdbea0ce | 555 | if (fVertexmode) |
556 | { | |
557 | // Make sure the primary vertex gets correct location and Id=1 | |
da17f667 | 558 | v[0]=0; |
559 | v[1]=0; | |
560 | v[2]=0; | |
561 | r.SetPosition(v,"car"); | |
562 | v[0]=fResolution; | |
563 | v[1]=fResolution; | |
564 | v[2]=fResolution; | |
565 | r.SetPositionErrors(v,"car"); | |
566 | ||
fdbea0ce | 567 | vert.SetId(1); |
568 | vert.SetTrackCopy(0); | |
569 | vert.SetVertexCopy(0); | |
da17f667 | 570 | vert.SetPosition(r); |
fdbea0ce | 571 | fEvent->AddVertex(vert,0); |
572 | } | |
573 | ||
c72198f1 | 574 | Int_t kf=0; |
fdbea0ce | 575 | Float_t charge=0,mass=0; |
6aff9852 | 576 | TString name; |
fdbea0ce | 577 | |
fdbea0ce | 578 | Int_t ntypes=4; |
579 | ||
580 | // Singular settings for a normal Pythia elementary particle interation | |
581 | if (!fNucl) | |
582 | { | |
583 | ntypes=1; | |
584 | ncols[0]=1; | |
585 | } | |
586 | ||
587 | // Generate all the various collisions | |
47dddbe4 | 588 | fSelect=0; // Flag to indicate whether the total event is selected or not |
589 | Int_t select=0; // Flag to indicate whether the sub-event is selected or not | |
590 | Int_t first=1; // Flag to indicate the first collision process | |
da17f667 | 591 | Double_t pnucl; |
fdbea0ce | 592 | Int_t npart=0,ntk=0; |
593 | Double_t dist=0; | |
594 | for (Int_t itype=0; itype<ntypes; itype++) | |
595 | { | |
596 | if (fNucl) | |
597 | { | |
598 | if (itype==0 && ncols[itype]) Initialize(fFrame,"p","p",fWin); | |
599 | if (itype==1 && ncols[itype]) Initialize(fFrame,"n","p",fWin); | |
600 | if (itype==2 && ncols[itype]) Initialize(fFrame,"p","n",fWin); | |
601 | if (itype==3 && ncols[itype]) Initialize(fFrame,"n","n",fWin); | |
602 | } | |
603 | for (Int_t jcol=0; jcol<ncols[itype]; jcol++) | |
604 | { | |
605 | GenerateEvent(); | |
606 | ||
47dddbe4 | 607 | select=IsSelected(); |
608 | if (select) fSelect=1; | |
609 | ||
da17f667 | 610 | if (first) // Store projectile and target information in the event structure |
611 | { | |
612 | if (fNucl) | |
613 | { | |
614 | v[0]=GetP(1,1); | |
615 | v[1]=GetP(1,2); | |
616 | v[2]=GetP(1,3); | |
47dddbe4 | 617 | pproj.SetVector(v,"car"); |
618 | pnucl=pproj.GetNorm(); | |
da17f667 | 619 | fEvent->SetProjectile(fAproj,fZproj,pnucl); |
620 | v[0]=GetP(2,1); | |
621 | v[1]=GetP(2,2); | |
622 | v[2]=GetP(2,3); | |
47dddbe4 | 623 | ptarg.SetVector(v,"car"); |
624 | pnucl=ptarg.GetNorm(); | |
da17f667 | 625 | fEvent->SetTarget(fAtarg,fZtarg,pnucl); |
626 | } | |
627 | else | |
628 | { | |
629 | v[0]=GetP(1,1); | |
630 | v[1]=GetP(1,2); | |
631 | v[2]=GetP(1,3); | |
632 | pnucl=sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); | |
633 | kf=GetK(1,2); | |
634 | fEvent->SetProjectile(0,0,pnucl,kf); | |
635 | v[0]=GetP(2,1); | |
636 | v[1]=GetP(2,2); | |
637 | v[2]=GetP(2,3); | |
638 | pnucl=sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); | |
639 | kf=GetK(2,2); | |
640 | fEvent->SetTarget(0,0,pnucl,kf); | |
641 | } | |
642 | first=0; | |
643 | } | |
644 | ||
645 | if (medit >= 0) Pyedit(medit); // Define which particles are to be kept | |
fdbea0ce | 646 | |
47dddbe4 | 647 | if (mlist>=0 && select) Pylist(mlist); |
fdbea0ce | 648 | |
c72198f1 | 649 | npart=GetN(); |
650 | for (Int_t jpart=1; jpart<=npart; jpart++) | |
fdbea0ce | 651 | { |
c72198f1 | 652 | kf=GetK(jpart,2); |
653 | charge=Pychge(kf)/3.; | |
654 | mass=GetP(jpart,5); | |
6aff9852 | 655 | name=GetPyname(kf); |
fdbea0ce | 656 | |
657 | // 3-momentum in GeV/c | |
c72198f1 | 658 | v[0]=GetP(jpart,1); |
659 | v[1]=GetP(jpart,2); | |
660 | v[2]=GetP(jpart,3); | |
fdbea0ce | 661 | p.SetVector(v,"car"); |
662 | ||
663 | // Production location in cm. | |
c72198f1 | 664 | v[0]=GetV(jpart,1)/10; |
665 | v[1]=GetV(jpart,2)/10; | |
666 | v[2]=GetV(jpart,3)/10; | |
da17f667 | 667 | r.SetPosition(v,"car"); |
fdbea0ce | 668 | |
669 | ntk++; | |
670 | ||
671 | t.Reset(); | |
672 | t.SetId(ntk); | |
673 | t.SetParticleCode(kf); | |
6aff9852 | 674 | t.SetName(name.Data()); |
fdbea0ce | 675 | t.SetCharge(charge); |
676 | t.SetMass(mass); | |
677 | t.Set3Momentum(p); | |
678 | t.SetBeginPoint(r); | |
679 | ||
680 | fEvent->AddTrack(t); | |
681 | ||
682 | // Build the vertex structures if requested | |
683 | if (fVertexmode) | |
684 | { | |
685 | // Check if track belongs within the resolution to an existing vertex | |
686 | Int_t add=0; | |
687 | for (Int_t jv=1; jv<=fEvent->GetNvertices(); jv++) | |
688 | { | |
689 | AliVertex* vx=fEvent->GetVertex(jv); | |
690 | if (vx) | |
691 | { | |
692 | rx=vx->GetPosition(); | |
693 | dist=rx.GetDistance(r); | |
694 | if (dist < fResolution) | |
695 | { | |
696 | AliTrack* tx=fEvent->GetIdTrack(ntk); | |
697 | if (tx) | |
698 | { | |
699 | vx->AddTrack(tx); | |
700 | add=1; | |
701 | } | |
702 | } | |
703 | } | |
704 | if (add) break; // No need to look further for vertex candidates | |
705 | } | |
706 | ||
707 | // If track was not close enough to an existing vertex | |
708 | // a new secondary vertex is created | |
709 | if (!add && fVertexmode>1) | |
710 | { | |
711 | AliTrack* tx=fEvent->GetIdTrack(ntk); | |
712 | if (tx) | |
713 | { | |
da17f667 | 714 | v[0]=fResolution; |
715 | v[1]=fResolution; | |
716 | v[2]=fResolution; | |
717 | r.SetPositionErrors(v,"car"); | |
fdbea0ce | 718 | vert.Reset(); |
719 | vert.SetTrackCopy(0); | |
720 | vert.SetVertexCopy(0); | |
721 | vert.SetId((fEvent->GetNvertices())+1); | |
722 | vert.SetPosition(r); | |
723 | vert.AddTrack(tx); | |
724 | fEvent->AddVertex(vert,0); | |
725 | } | |
726 | } | |
727 | } | |
728 | } // End of loop over the produced particles for each collision | |
729 | } // End of loop over number of collisions for each type | |
730 | } // End of loop over collision types | |
731 | ||
732 | // Link sec. vertices to primary if requested | |
733 | // Note that also the connecting tracks are automatically created | |
734 | if (fVertexmode>2) | |
735 | { | |
736 | AliVertex* vp=fEvent->GetIdVertex(1); // Primary vertex | |
737 | if (vp) | |
738 | { | |
739 | for (Int_t i=2; i<=fEvent->GetNvertices(); i++) | |
740 | { | |
741 | AliVertex* vx=fEvent->GetVertex(i); | |
742 | if (vx) | |
743 | { | |
744 | if (vx->GetId() != 1) vp->AddVertex(vx); | |
745 | } | |
746 | } | |
747 | } | |
748 | } | |
749 | ||
47dddbe4 | 750 | // Include the spectator tracks in the event structure. |
751 | if (fNucl && specmode) | |
752 | { | |
47dddbe4 | 753 | v[0]=0; |
754 | v[1]=0; | |
755 | v[2]=0; | |
756 | r.SetPosition(v,"car"); | |
757 | ||
758 | zp=fZproj-(ncols[0]+ncols[2]); | |
759 | if (zp<0) zp=0; | |
760 | ap=fAproj-(ncols[0]+ncols[1]+ncols[2]+ncols[3]); | |
761 | if (ap<0) ap=0; | |
762 | zt=fZtarg-(ncols[0]+ncols[1]); | |
763 | if (zt<0) zt=0; | |
764 | at=fAtarg-(ncols[0]+ncols[1]+ncols[2]+ncols[3]); | |
765 | if (at<0) at=0; | |
766 | ||
767 | Int_t nspec=0; | |
768 | ||
769 | if (pproj.GetNorm() > fSpecpmin) | |
770 | { | |
771 | kf=2212; // Projectile spectator protons | |
772 | charge=Pychge(kf)/3.; | |
6aff9852 | 773 | mass=GetPMAS(Pycomp(kf),1); |
774 | name=GetPyname(kf); | |
47dddbe4 | 775 | for (Int_t iprojp=1; iprojp<=zp; iprojp++) |
776 | { | |
777 | nspec++; | |
778 | t.Reset(); | |
779 | t.SetId(-nspec); | |
780 | t.SetParticleCode(kf); | |
6aff9852 | 781 | t.SetName(name.Data()); |
47dddbe4 | 782 | t.SetTitle("Projectile spectator proton"); |
783 | t.SetCharge(charge); | |
784 | t.SetMass(mass); | |
785 | t.Set3Momentum(pproj); | |
786 | t.SetBeginPoint(r); | |
787 | ||
788 | fEvent->AddTrack(t); | |
789 | } | |
790 | ||
791 | kf=2112; // Projectile spectator neutrons | |
792 | charge=Pychge(kf)/3.; | |
6aff9852 | 793 | mass=GetPMAS(Pycomp(kf),1); |
794 | name=GetPyname(kf); | |
47dddbe4 | 795 | for (Int_t iprojn=1; iprojn<=(ap-zp); iprojn++) |
796 | { | |
797 | nspec++; | |
798 | t.Reset(); | |
799 | t.SetId(-nspec); | |
800 | t.SetParticleCode(kf); | |
6aff9852 | 801 | t.SetName(name.Data()); |
47dddbe4 | 802 | t.SetTitle("Projectile spectator neutron"); |
803 | t.SetCharge(charge); | |
804 | t.SetMass(mass); | |
805 | t.Set3Momentum(pproj); | |
806 | t.SetBeginPoint(r); | |
807 | ||
808 | fEvent->AddTrack(t); | |
809 | } | |
810 | } | |
811 | ||
812 | if (ptarg.GetNorm() > fSpecpmin) | |
813 | { | |
814 | kf=2212; // Target spectator protons | |
815 | charge=Pychge(kf)/3.; | |
6aff9852 | 816 | mass=GetPMAS(Pycomp(kf),1); |
817 | name=GetPyname(kf); | |
47dddbe4 | 818 | for (Int_t itargp=1; itargp<=zt; itargp++) |
819 | { | |
820 | nspec++; | |
821 | t.Reset(); | |
822 | t.SetId(-nspec); | |
823 | t.SetParticleCode(kf); | |
6aff9852 | 824 | t.SetName(name.Data()); |
47dddbe4 | 825 | t.SetTitle("Target spectator proton"); |
826 | t.SetCharge(charge); | |
827 | t.SetMass(mass); | |
828 | t.Set3Momentum(ptarg); | |
829 | t.SetBeginPoint(r); | |
830 | ||
831 | fEvent->AddTrack(t); | |
832 | } | |
833 | ||
834 | kf=2112; // Target spectator neutrons | |
835 | charge=Pychge(kf)/3.; | |
6aff9852 | 836 | mass=GetPMAS(Pycomp(kf),1); |
837 | name=GetPyname(kf); | |
47dddbe4 | 838 | for (Int_t itargn=1; itargn<=(at-zt); itargn++) |
839 | { | |
840 | nspec++; | |
841 | t.Reset(); | |
842 | t.SetId(-nspec); | |
843 | t.SetParticleCode(kf); | |
6aff9852 | 844 | t.SetName(name.Data()); |
47dddbe4 | 845 | t.SetTitle("Target spectator neutron"); |
846 | t.SetCharge(charge); | |
847 | t.SetMass(mass); | |
848 | t.Set3Momentum(ptarg); | |
849 | t.SetBeginPoint(r); | |
850 | ||
851 | fEvent->AddTrack(t); | |
852 | } | |
853 | } | |
854 | ||
855 | // Link the spectator tracks to the primary vertex. | |
856 | if (fVertexmode) | |
857 | { | |
858 | AliVertex* vp=fEvent->GetIdVertex(1); | |
859 | if (vp) | |
860 | { | |
861 | for (Int_t ispec=1; ispec<=nspec; ispec++) | |
862 | { | |
863 | AliTrack* tx=fEvent->GetIdTrack(-ispec); | |
864 | if (tx) vp->AddTrack(tx); | |
865 | } | |
866 | } | |
867 | } | |
868 | } | |
869 | ||
c72198f1 | 870 | if (mlist && !(fEventnum%fPrintfreq)) cout << endl; // Create empty output line after the event |
47dddbe4 | 871 | |
872 | if (fOutTree && fSelect) fOutTree->Fill(); | |
fdbea0ce | 873 | } |
874 | /////////////////////////////////////////////////////////////////////////// | |
47dddbe4 | 875 | AliEvent* AliCollider::GetEvent(Int_t select) |
fdbea0ce | 876 | { |
877 | // Provide pointer to the generated event structure. | |
47dddbe4 | 878 | // |
879 | // select = 0 : Always return the pointer to the generated event. | |
880 | // 1 : Only return the pointer to the generated event in case | |
881 | // the event passed the selection criteria as specified via | |
882 | // SelectEvent(). Otherwise the value 0 will be returned. | |
883 | // | |
884 | // By invoking GetEvent() the default of select=0 will be used. | |
885 | ||
886 | if (!select || fSelect) | |
887 | { | |
888 | return fEvent; | |
889 | } | |
890 | else | |
891 | { | |
892 | return 0; | |
893 | } | |
fdbea0ce | 894 | } |
895 | /////////////////////////////////////////////////////////////////////////// | |
896 | void AliCollider::EndRun() | |
897 | { | |
898 | // Properly close the output file (if needed). | |
899 | if (fOutFile) | |
900 | { | |
901 | fOutFile->Write(); | |
902 | fOutFile->Close(); | |
903 | cout << " *AliCollider::EndRun* Output file correctly closed." << endl; | |
904 | } | |
905 | } | |
906 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 907 | void AliCollider::SetStable(Int_t id,Int_t mode) |
908 | { | |
909 | // Declare whether a particle must be regarded as stable or not. | |
910 | // The parameter "id" indicates the Pythia KF particle code, which | |
911 | // basically is the PDG particle identifier code. | |
912 | // The parameter "mode" indicates the action to be taken. | |
913 | // | |
914 | // mode = 0 : Particle will be able to decay | |
915 | // 1 : Particle will be regarded as stable. | |
916 | // | |
917 | // In case the user does NOT explicitly invoke this function, the standard | |
918 | // Pythia settings for the decay tables are used. | |
919 | // | |
920 | // When this function is invoked without the "mode" argument, then the | |
921 | // default of mode=1 will be used for the specified particle. | |
922 | // | |
923 | // Notes : | |
924 | // ------- | |
925 | // 1) This function should be invoked after the initialisation call | |
926 | // to AliCollider::Init. | |
927 | // 2) Due to the internals of Pythia, there is no need to specify particles | |
928 | // and their corresponding anti-particles separately as (un)stable. | |
929 | // Once a particle has been declared (un)stable, the corresponding | |
930 | // anti-particle will be treated in the same way. | |
931 | ||
932 | if (mode==0 || mode==1) | |
933 | { | |
934 | Int_t kc=Pycomp(id); | |
935 | Int_t decay=1-mode; | |
936 | if (kc>0) | |
937 | { | |
938 | SetMDCY(kc,1,decay); | |
939 | } | |
940 | else | |
941 | { | |
942 | cout << " *AliCollider::SetStable* Unknown particle code. id = " << id << endl; | |
943 | } | |
944 | } | |
945 | else | |
946 | { | |
947 | cout << " *AliCollider::SetStable* Invalid parameter. mode = " << mode << endl; | |
948 | } | |
949 | } | |
950 | /////////////////////////////////////////////////////////////////////////// | |
47dddbe4 | 951 | void AliCollider::SelectEvent(Int_t id) |
952 | { | |
953 | // Add a particle to the event selection list. | |
954 | // The parameter "id" indicates the Pythia KF particle code, which | |
955 | // basically is the PDG particle identifier code. | |
956 | // In case the user has built a selection list via this procedure, only the | |
957 | // events in which one of the particles specified in the list was generated | |
958 | // will be kept. | |
959 | // The investigation of the generated particles takes place when the complete | |
960 | // event is in memory, including all (shortlived) mother particles and resonances. | |
961 | // So, the settings of the various particle decay modes have no influence on | |
962 | // the event selection described here. | |
963 | // | |
964 | // If no list has been specified, all events will be accepted. | |
965 | // | |
966 | // Note : id=0 will delete the selection list. | |
967 | // | |
968 | // Be aware of the fact that severe selection criteria (i.e. selecting only | |
969 | // rare events) may result in long runtimes before an event sample has been | |
970 | // obtained. | |
971 | // | |
972 | if (!id) | |
973 | { | |
974 | if (fSelections) | |
975 | { | |
976 | delete fSelections; | |
977 | fSelections=0; | |
978 | } | |
979 | } | |
980 | else | |
981 | { | |
982 | Int_t kc=Pycomp(id); | |
983 | if (!fSelections) | |
984 | { | |
985 | fSelections=new TArrayI(1); | |
986 | fSelections->AddAt(kc,0); | |
987 | } | |
988 | else | |
989 | { | |
990 | Int_t exist=0; | |
991 | Int_t size=fSelections->GetSize(); | |
992 | for (Int_t i=0; i<size; i++) | |
993 | { | |
994 | if (kc==fSelections->At(i)) | |
995 | { | |
996 | exist=1; | |
997 | break; | |
998 | } | |
999 | } | |
1000 | ||
1001 | if (!exist) | |
1002 | { | |
1003 | fSelections->Set(size+1); | |
1004 | fSelections->AddAt(kc,size); | |
1005 | } | |
1006 | } | |
1007 | } | |
1008 | } | |
1009 | /////////////////////////////////////////////////////////////////////////// | |
1010 | Int_t AliCollider::GetSelectionFlag() | |
1011 | { | |
1012 | // Return the value of the selection flag for the total event. | |
1013 | // When the event passed the selection criteria as specified via | |
1014 | // SelectEvent() the value 1 is returned, otherwise the value 0 is returned. | |
1015 | return fSelect; | |
1016 | } | |
1017 | /////////////////////////////////////////////////////////////////////////// | |
1018 | Int_t AliCollider::IsSelected() | |
1019 | { | |
1020 | // Check whether the generated (sub)event contains one of the particles | |
1021 | // specified in the selection list via SelectEvent(). | |
1022 | // If this is the case or when no selection list is present, the value 1 | |
1023 | // will be returned, indicating the event is selected to be kept. | |
1024 | // Otherwise the value 0 will be returned. | |
1025 | ||
1026 | if (!fSelections) return 1; | |
1027 | ||
1028 | Int_t nsel=fSelections->GetSize(); | |
1029 | Int_t npart=GetN(); | |
1030 | Int_t kf,kc; | |
1031 | ||
1032 | Int_t select=0; | |
1033 | for (Int_t jpart=1; jpart<=npart; jpart++) | |
1034 | { | |
1035 | kf=GetK(jpart,2); | |
1036 | kc=Pycomp(kf); | |
1037 | for (Int_t i=0; i<nsel; i++) | |
1038 | { | |
1039 | if (kc==fSelections->At(i)) | |
1040 | { | |
1041 | select=1; | |
1042 | break; | |
1043 | } | |
1044 | } | |
1045 | if (select) break; | |
1046 | } | |
1047 | return select; | |
1048 | } | |
1049 | /////////////////////////////////////////////////////////////////////////// | |
1050 | void AliCollider::SetSpectatorPmin(Float_t pmin) | |
1051 | { | |
1052 | // Set minimal momentum in GeV/c for spectator tracks to be stored. | |
1053 | // Spectator tracks with a momentum below this threshold will not be stored | |
1054 | // in the (output) event structure. | |
1055 | // This facility allows to minimise the output file size. | |
1056 | // Note that when the user wants to boost the event into another reference | |
1057 | // frame these spectator tracks might have got momenta above the threshold. | |
1058 | // However, when the spectator tracks were not stored in the event structure | |
1059 | // in the original frame, there is no way to retreive them anymore. | |
1060 | fSpecpmin=pmin; | |
1061 | } | |
1062 | /////////////////////////////////////////////////////////////////////////// | |
1063 | Float_t AliCollider::GetSpectatorPmin() | |
1064 | { | |
1065 | // Provide the minimal spectator momentum in GeV/c. | |
1066 | return fSpecpmin; | |
1067 | } | |
1068 | /////////////////////////////////////////////////////////////////////////// | |
6aff9852 | 1069 | TString AliCollider::GetPyname(Int_t kf) |
1070 | { | |
1071 | // Provide the correctly truncated Pythia particle name for PGD code kf | |
1072 | // | |
1073 | // The TPythia6::Pyname returned name is copied into a TString and truncated | |
1074 | // at the first blank to prevent funny trailing characters due to incorrect | |
1075 | // stripping of empty characters in TPythia6::Pyname. | |
1076 | // The truncation at the first blank is allowed due to the Pythia convention | |
1077 | // that particle names never contain blanks. | |
1078 | char name[16]; | |
1079 | TString sname; | |
1080 | Pyname(kf,name); | |
1081 | sname=name[0]; | |
1082 | for (Int_t i=1; i<16; i++) | |
1083 | { | |
1084 | if (name[i]==' ') break; | |
1085 | sname=sname+name[i]; | |
1086 | } | |
1087 | return sname; | |
1088 | } | |
1089 | /////////////////////////////////////////////////////////////////////////// |