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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 | ||
965bd237 | 16 | // $Id: AliCollider.cxx,v 1.12 2004/05/04 15:33:04 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); | |
25eefd00 | 45 | // gen->SetResolution(1e-6); // 1 micron vertex resolution |
fdbea0ce | 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 | |
965bd237 | 111 | //- Modified: NvE $Date: 2004/05/04 15:33:04 $ 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. | |
965bd237 | 123 | // |
124 | // Some Pythia default MC parameters are automatically modified to provide | |
125 | // more suitable running conditions for soft processes in view of | |
126 | // nucleus-nucleus interactions and astrophysical processes. | |
127 | // The user may initialise the generator with all the default Pythia | |
128 | // parameters and obtain full user control to modify the settings by means | |
129 | // of the SetUserControl memberfunction. | |
130 | // | |
131 | // Refer to the SetElastic memberfunction for the inclusion of elastic | |
132 | // and diffractive processes. | |
133 | // By default these processes are not included. | |
134 | ||
fdbea0ce | 135 | fVertexmode=0; // No vertex structure creation |
25eefd00 | 136 | fResolution=1e-7; // Standard resolution is 0.1 micron |
fdbea0ce | 137 | fRunnum=0; |
138 | fEventnum=0; | |
139 | fPrintfreq=1; | |
965bd237 | 140 | fUserctrl=0; // Automatic optimisation of some MC parameters |
141 | fElastic=0; // No elastic and diffractive processes | |
fdbea0ce | 142 | |
143 | fEvent=0; | |
144 | ||
47dddbe4 | 145 | fSpecpmin=0; |
146 | ||
fdbea0ce | 147 | fFrame="none"; |
148 | fWin=0; | |
149 | ||
150 | fNucl=0; | |
151 | fZproj=0; | |
152 | fAproj=0; | |
153 | fZtarg=0; | |
154 | fAtarg=0; | |
155 | fFracpp=0; | |
156 | fFracnp=0; | |
157 | fFracpn=0; | |
158 | fFracnn=0; | |
159 | ||
160 | fOutFile=0; | |
161 | fOutTree=0; | |
47dddbe4 | 162 | |
163 | fSelections=0; | |
164 | fSelect=0; | |
165 | ||
166 | TString s=GetName(); | |
167 | s+=" (AliCollider)"; | |
168 | SetName(s.Data()); | |
fdbea0ce | 169 | } |
170 | /////////////////////////////////////////////////////////////////////////// | |
171 | AliCollider::~AliCollider() | |
172 | { | |
173 | // Default destructor | |
174 | if (fEvent) | |
175 | { | |
176 | delete fEvent; | |
177 | fEvent=0; | |
178 | } | |
179 | if (fOutFile) | |
180 | { | |
181 | delete fOutFile; | |
182 | fOutFile=0; | |
183 | } | |
184 | if (fOutTree) | |
185 | { | |
186 | delete fOutTree; | |
187 | fOutTree=0; | |
188 | } | |
47dddbe4 | 189 | if (fSelections) |
190 | { | |
191 | delete fSelections; | |
192 | fSelections=0; | |
193 | } | |
fdbea0ce | 194 | } |
195 | /////////////////////////////////////////////////////////////////////////// | |
196 | void AliCollider::SetOutputFile(TString s) | |
197 | { | |
198 | // Create the output file containing all the data in ROOT output format. | |
199 | if (fOutFile) | |
200 | { | |
201 | delete fOutFile; | |
202 | fOutFile=0; | |
203 | } | |
204 | fOutFile=new TFile(s.Data(),"RECREATE","AliCollider data"); | |
205 | ||
206 | if (fOutTree) | |
207 | { | |
208 | delete fOutTree; | |
209 | fOutTree=0; | |
210 | } | |
211 | fOutTree=new TTree("T","AliCollider event data"); | |
212 | ||
213 | Int_t bsize=32000; | |
214 | Int_t split=0; | |
215 | fOutTree->Branch("Events","AliEvent",&fEvent,bsize,split); | |
216 | } | |
217 | /////////////////////////////////////////////////////////////////////////// | |
218 | void AliCollider::SetVertexMode(Int_t mode) | |
219 | { | |
220 | // Set the mode of the vertex structure creation. | |
221 | // | |
222 | // By default all generated tracks will only appear in the AliEvent | |
223 | // structure without any primary (and secondary) vertex structure. | |
224 | // The user can build the vertex structure if he/she wants by means | |
225 | // of the beginpoint location of each AliTrack. | |
226 | // | |
227 | // However, one can also let AliCollider automatically create | |
228 | // the primary (and secondary) vertex structure(s). | |
229 | // In this case the primary vertex is given Id=1 and all sec. vertices | |
230 | // are given Id's 2,3,4,.... | |
231 | // All vertices are created as standalone entities in the AliEvent structure | |
232 | // without any linking between the various vertices. | |
233 | // For this automated process, the user-selected resolution | |
234 | // (see SetResolution) is used to decide whether or not certain vertex | |
235 | // locations can be resolved. | |
236 | // In case no vertex creation is selected (i.e. the default mode=0), | |
237 | // the value of the resolution is totally irrelevant. | |
238 | // | |
239 | // The user can also let AliCollider automatically connect the sec. vertices | |
240 | // to the primary vertex (i.e. mode=3). This process will also automatically | |
241 | // generate the tracks connecting the vertices. | |
242 | // Note that the result of the mode=3 operation may be very sensitive to | |
243 | // the resolution parameter. Therefore, no attempt is made to distinguish | |
244 | // between secondary, tertiary etc... vertices. All sec. vertices are | |
245 | // linked to the primary one. | |
246 | // | |
247 | // Irrespective of the selected mode, all generated tracks can be obtained | |
248 | // directly from the AliEvent structure. | |
249 | // In case (sec.) vertex creation is selected, all generated vertices can | |
250 | // also be obtained directly from the AliEvent structure. | |
251 | // These (sec.) vertices contain only the corresponding pointers to the various | |
252 | // tracks which are stored in the AliEvent structure. | |
253 | // | |
254 | // Overview of vertex creation modes : | |
255 | // ----------------------------------- | |
256 | // mode = 0 ==> No vertex structure will be created | |
257 | // 1 ==> Only primary vertex structure will be created | |
258 | // 2 ==> Unconnected primary and secondary vertices will be created | |
259 | // 3 ==> Primary and secondary vertices will be created where all the | |
260 | // sec. vertices will be connected to the primary vertex. | |
261 | // Also the vertex connecting tracks will be automatically | |
262 | // generated. | |
263 | // | |
264 | if (mode<0 || mode >3) | |
265 | { | |
266 | cout << " *AliCollider::SetVertexMode* Invalid argument mode : " << mode << endl; | |
267 | fVertexmode=0; | |
268 | } | |
269 | else | |
270 | { | |
271 | fVertexmode=mode; | |
272 | } | |
273 | } | |
274 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 275 | Int_t AliCollider::GetVertexMode() const |
fdbea0ce | 276 | { |
277 | // Provide the current mode for vertex structure creation. | |
278 | return fVertexmode; | |
279 | } | |
280 | /////////////////////////////////////////////////////////////////////////// | |
281 | void AliCollider::SetResolution(Double_t res) | |
282 | { | |
25eefd00 | 283 | // Set the resolution (in meter) for resolving (sec.) vertices. |
fdbea0ce | 284 | // By default this resolution is set to 0.1 micron. |
285 | // Note : In case no vertex creation has been selected, the value of | |
286 | // the resolution is totally irrelevant. | |
287 | fResolution=fabs(res); | |
288 | } | |
289 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 290 | Double_t AliCollider::GetResolution() const |
fdbea0ce | 291 | { |
25eefd00 | 292 | // Provide the current resolution (in meter) for resolving (sec.) vertices. |
fdbea0ce | 293 | return fResolution; |
294 | } | |
295 | /////////////////////////////////////////////////////////////////////////// | |
296 | void AliCollider::SetRunNumber(Int_t run) | |
297 | { | |
298 | // Set the user defined run number. | |
299 | // By default the run number is set to 0. | |
300 | fRunnum=run; | |
301 | } | |
302 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 303 | Int_t AliCollider::GetRunNumber() const |
fdbea0ce | 304 | { |
305 | // Provide the user defined run number. | |
306 | return fRunnum; | |
307 | } | |
308 | /////////////////////////////////////////////////////////////////////////// | |
309 | void AliCollider::SetPrintFreq(Int_t n) | |
310 | { | |
311 | // Set the print frequency for every 'n' events. | |
312 | // By default the printfrequency is set to 1 (i.e. every event). | |
313 | fPrintfreq=n; | |
314 | } | |
315 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 316 | Int_t AliCollider::GetPrintFreq() const |
fdbea0ce | 317 | { |
318 | // Provide the user selected print frequency. | |
319 | return fPrintfreq; | |
320 | } | |
321 | /////////////////////////////////////////////////////////////////////////// | |
965bd237 | 322 | void AliCollider::SetUserControl(Int_t flag) |
323 | { | |
324 | // Set the user control flag w.r.t. disabling automatic optimisation | |
325 | // of some Pythia default MC parameters for soft interactions in view of | |
326 | // nucleus-nucleus collisions and astrophysical processes. | |
327 | // Flag = 0 : Limited user control (automatic optimisation enabled) | |
328 | // 1 : Full user control (automatic optimisation disabled) | |
329 | // By default the user control is set to 0 (i.e. automatic optimisation). | |
330 | // See the Init() memberfunctions for further details w.r.t. the optimisations. | |
331 | fUserctrl=flag; | |
332 | } | |
333 | /////////////////////////////////////////////////////////////////////////// | |
334 | Int_t AliCollider::GetUserControl() const | |
335 | { | |
336 | // Provide the value of the user control flag. | |
337 | return fUserctrl; | |
338 | } | |
339 | /////////////////////////////////////////////////////////////////////////// | |
340 | void AliCollider::SetElastic(Int_t flag) | |
341 | { | |
342 | // Set the flag w.r.t. inclusion of elastic and diffractive processes. | |
343 | // By default these processes are not included. | |
344 | // Flag = 0 : Do not include elastic and diffractive processes | |
345 | // 1 : Elastic and diffractive processes will be included | |
346 | fElastic=flag; | |
347 | } | |
348 | /////////////////////////////////////////////////////////////////////////// | |
349 | Int_t AliCollider::GetElastic() const | |
350 | { | |
351 | // Provide the value of the control flag for elastic and diffractive processes. | |
352 | return fElastic; | |
353 | } | |
354 | /////////////////////////////////////////////////////////////////////////// | |
fdbea0ce | 355 | void AliCollider::Init(char* frame,char* beam,char* target,Float_t win) |
356 | { | |
357 | // Initialisation of the underlying Pythia generator package. | |
965bd237 | 358 | // The event number is reset to 0. |
fdbea0ce | 359 | // This routine just invokes TPythia6::Initialize(...) and the arguments |
360 | // have the corresponding meaning. | |
965bd237 | 361 | // Some Pythia default MC parameters are automatically modified to provide |
362 | // more suitable running conditions for soft processes in view of | |
363 | // astrophysical processes. | |
364 | // The optimisations consist of : | |
25eefd00 | 365 | // * Usage of real photons for photon beams or targets |
965bd237 | 366 | // * Minimum CMS energy of 3 GeV for the event |
367 | // * Activation of the default K factor values | |
368 | // with separate settings for ordinary and color annihilation graphs. | |
369 | // The user may initialise the generator with all the default Pythia | |
370 | // parameters and obtain full user control to modify the settings by means | |
371 | // of invoking the SetUserControl memberfunction before this initialisation. | |
372 | // Note that the inclusion of elastic and diffractive processes is controlled | |
373 | // by invokation of the SetElastic memberfunction before this initialisation, | |
374 | // irrespective of the UserControl selection. | |
375 | ||
376 | if (!fUserctrl) // Optimisation of some MC parameters | |
377 | { | |
378 | SetMSTP(14,10); // Real photons for photon beams or targets | |
379 | SetPARP(2,3.); // Minimum CMS energy for the event | |
380 | SetMSTP(33,2); // Activate K factor. Separate for ordinary and color annih. graphs | |
381 | } | |
382 | ||
383 | if (fElastic) SetMSEL(2); // Include low-Pt, elastic and diffractive events | |
384 | ||
fdbea0ce | 385 | fEventnum=0; |
386 | fNucl=0; | |
387 | fFrame=frame; | |
388 | fWin=win; | |
389 | Initialize(frame,beam,target,win); | |
c72198f1 | 390 | |
e313997a | 391 | cout << endl; |
c72198f1 | 392 | cout << " *AliCollider::Init* Standard Pythia initialisation." << endl; |
393 | cout << " Beam particle : " << beam << " Target particle : " << target | |
394 | << " Frame = " << frame << " Energy = " << win | |
395 | << endl; | |
fdbea0ce | 396 | } |
397 | /////////////////////////////////////////////////////////////////////////// | |
398 | void AliCollider::Init(char* frame,Int_t zp,Int_t ap,Int_t zt,Int_t at,Float_t win) | |
399 | { | |
400 | // Initialisation of the underlying Pythia generator package for the generation | |
401 | // of nucleus-nucleus interactions. | |
965bd237 | 402 | // The event number is reset to 0. |
fdbea0ce | 403 | // In addition to the Pythia standard arguments 'frame' and 'win', the user |
da17f667 | 404 | // can specify here (Z,A) values of the projectile and target nuclei. |
405 | // | |
406 | // Note : The 'win' value denotes either the cms energy per nucleon-nucleon collision | |
407 | // (i.e. frame="cms") or the momentum per nucleon in all other cases. | |
408 | // | |
965bd237 | 409 | // Some Pythia default MC parameters are automatically modified to provide |
410 | // more suitable running conditions for soft processes in view of | |
411 | // nucleus-nucleus interactions and astrophysical processes. | |
412 | // The optimisations consist of : | |
413 | // * Minimum CMS energy of 3 GeV for the event | |
414 | // * Activation of the default K factor values | |
415 | // with separate settings for ordinary and color annihilation graphs. | |
416 | // The user may initialise the generator with all the default Pythia | |
417 | // parameters and obtain full user control to modify the settings by means | |
418 | // of invoking the SetUserControl memberfunction before this initialisation. | |
419 | // Note that the inclusion of elastic and diffractive processes is controlled | |
420 | // by invokation of the SetElastic memberfunction before this initialisation, | |
421 | // irrespective of the UserControl selection. | |
422 | ||
423 | if (!fUserctrl) // Optimisation of some MC parameters | |
424 | { | |
425 | SetPARP(2,3.); // Minimum CMS energy for the event | |
426 | SetMSTP(33,2); // Activate K factor. Separate for ordinary and color annih. graphs | |
427 | } | |
428 | ||
429 | if (fElastic) SetMSEL(2); // Include low-Pt, elastic and diffractive events | |
430 | ||
fdbea0ce | 431 | fEventnum=0; |
432 | fNucl=1; | |
433 | fFrame=frame; | |
434 | fWin=win; | |
435 | fZproj=0; | |
436 | fAproj=0; | |
437 | fZtarg=0; | |
438 | fAtarg=0; | |
439 | fFracpp=0; | |
440 | fFracnp=0; | |
441 | fFracpn=0; | |
442 | fFracnn=0; | |
443 | ||
444 | if (ap<1 || at<1 || zp>ap || zt>at) | |
445 | { | |
e313997a | 446 | cout << endl; |
fdbea0ce | 447 | cout << " *AliCollider::Init* Invalid input value(s). Zproj = " << zp |
448 | << " Aproj = " << ap << " Ztarg = " << zt << " Atarg = " << at << endl; | |
449 | return; | |
450 | } | |
451 | ||
452 | fZproj=zp; | |
453 | fAproj=ap; | |
454 | fZtarg=zt; | |
455 | fAtarg=at; | |
456 | ||
e313997a | 457 | cout << endl; |
fdbea0ce | 458 | cout << " *AliCollider::Init* Nucleus-Nucleus generator initialisation." << endl; |
459 | cout << " Zproj = " << zp << " Aproj = " << ap << " Ztarg = " << zt << " Atarg = " << at | |
460 | << " Frame = " << frame << " Energy = " << win | |
461 | << endl; | |
462 | } | |
463 | /////////////////////////////////////////////////////////////////////////// | |
464 | void AliCollider::GetFractions(Float_t zp,Float_t ap,Float_t zt,Float_t at) | |
465 | { | |
466 | // Determine the fractions for the various N-N collision processes. | |
467 | // The various processes are : p+p, n+p, p+n and n+n. | |
468 | if (zp<0) zp=0; | |
469 | if (zt<0) zt=0; | |
470 | ||
471 | fFracpp=0; | |
472 | fFracnp=0; | |
473 | fFracpn=0; | |
474 | fFracnn=0; | |
475 | ||
476 | if (ap>0 && at>0) | |
477 | { | |
478 | fFracpp=(zp/ap)*(zt/at); | |
479 | fFracnp=(1.-zp/ap)*(zt/at); | |
480 | fFracpn=(zp/ap)*(1.-zt/at); | |
481 | fFracnn=(1.-zp/ap)*(1.-zt/at); | |
482 | } | |
483 | } | |
484 | /////////////////////////////////////////////////////////////////////////// | |
485 | void AliCollider::MakeEvent(Int_t npt,Int_t mlist,Int_t medit) | |
486 | { | |
487 | // Generate one event. | |
488 | // In case of a nucleus-nucleus interaction, the argument 'npt' denotes | |
489 | // the number of participant nucleons. | |
47dddbe4 | 490 | // Normally also the spectator tracks will be stored into the event structure. |
491 | // The spectator tracks have a negative user Id to distinguish them from the | |
492 | // ordinary generated tracks. | |
493 | // In case the user has selected the creation of vertex structures, the spectator | |
494 | // tracks will be linked to the primary vertex. | |
495 | // However, specification of npt<0 will suppress the storage of spectator tracks. | |
496 | // In the latter case abs(npt) will be taken as the number of participants. | |
fdbea0ce | 497 | // In case of a standard Pythia run for 'elementary' particle interactions, |
498 | // the value of npt is totally irrelevant. | |
da17f667 | 499 | // |
fdbea0ce | 500 | // The argument 'mlist' denotes the list mode used for Pylist(). |
da17f667 | 501 | // Note : mlist<0 suppresses the invokation of Pylist(). |
502 | // By default, no listing is produced (i.e. mlist=-1). | |
503 | // | |
c72198f1 | 504 | // The argument 'medit' denotes the edit mode used for Pyedit(). |
505 | // Note : medit<0 suppresses the invokation of Pyedit(). | |
506 | // By default, only 'stable' final particles are kept (i.e. medit=1). | |
507 | // | |
da17f667 | 508 | // In the case of a standard Pythia run concerning 'elementary' particle |
509 | // interactions, the projectile and target particle ID's for the created | |
510 | // event structure are set to the corresponding Pythia KF codes. | |
511 | // All the A and Z values are in that case set to zero. | |
512 | // In case of a nucleus-nucleus interaction, the proper A and Z values for | |
513 | // the projectile and target particles are set in the event structure. | |
514 | // However, in this case both particle ID's are set to zero. | |
47dddbe4 | 515 | // |
516 | // Note : Only in case an event passed the selection criteria as specified | |
517 | // via SelectEvent(), the event will appear on the output file. | |
fdbea0ce | 518 | |
519 | fEventnum++; | |
520 | ||
47dddbe4 | 521 | Int_t specmode=1; |
522 | if (npt<0) | |
523 | { | |
524 | specmode=0; | |
525 | npt=abs(npt); | |
526 | } | |
527 | ||
fdbea0ce | 528 | // Counters for the various (proj,targ) combinations : p+p, n+p, p+n and n+n |
529 | Int_t ncols[4]={0,0,0,0}; | |
530 | ||
47dddbe4 | 531 | Int_t zp=0; |
532 | Int_t ap=0; | |
533 | Int_t zt=0; | |
534 | Int_t at=0; | |
535 | ||
c72198f1 | 536 | Int_t ncol=1; |
fdbea0ce | 537 | if (fNucl) |
538 | { | |
539 | if (npt<1 || npt>(fAproj+fAtarg)) | |
540 | { | |
541 | cout << " *AliCollider::MakeEvent* Invalid input value. npt = " << npt | |
542 | << " Aproj = " << fAproj << " Atarg = " << fAtarg << endl; | |
543 | return; | |
544 | } | |
545 | ||
546 | // Determine the number of nucleon-nucleon collisions | |
c72198f1 | 547 | ncol=npt/2; |
fdbea0ce | 548 | if (npt%2 && fRan.Uniform()>0.5) ncol+=1; |
549 | ||
550 | // Determine the number of the various types of N+N interactions | |
47dddbe4 | 551 | zp=fZproj; |
552 | ap=fAproj; | |
553 | zt=fZtarg; | |
554 | at=fAtarg; | |
fdbea0ce | 555 | Int_t maxa=2; // Indicator whether proj (1) or target (2) has maximal A left |
556 | if (ap>at) maxa=1; | |
557 | Float_t* rans=new Float_t[ncol]; | |
558 | fRan.Uniform(rans,ncol); | |
559 | Float_t rndm=0; | |
560 | for (Int_t i=0; i<ncol; i++) | |
561 | { | |
562 | GetFractions(zp,ap,zt,at); | |
563 | rndm=rans[i]; | |
564 | if (rndm<=fFracpp) // p+p interaction | |
565 | { | |
566 | ncols[0]++; | |
4b570fab | 567 | if (maxa==2) |
fdbea0ce | 568 | { |
569 | at--; | |
570 | zt--; | |
571 | } | |
572 | else | |
573 | { | |
574 | ap--; | |
575 | zp--; | |
576 | } | |
577 | } | |
578 | if (rndm>fFracpp && rndm<=(fFracpp+fFracnp)) // n+p interaction | |
579 | { | |
580 | ncols[1]++; | |
4b570fab | 581 | if (maxa==2) |
fdbea0ce | 582 | { |
583 | at--; | |
584 | zt--; | |
585 | } | |
586 | else | |
587 | { | |
588 | ap--; | |
589 | } | |
590 | } | |
591 | if (rndm>(fFracpp+fFracnp) && rndm<=(fFracpp+fFracnp+fFracpn)) // p+n interaction | |
592 | { | |
593 | ncols[2]++; | |
4b570fab | 594 | if (maxa==2) |
fdbea0ce | 595 | { |
596 | at--; | |
597 | } | |
598 | else | |
599 | { | |
600 | ap--; | |
601 | zp--; | |
602 | } | |
603 | } | |
604 | if (rndm>(fFracpp+fFracnp+fFracpn)) // n+n interaction | |
605 | { | |
606 | ncols[3]++; | |
4b570fab | 607 | if (maxa==2) |
fdbea0ce | 608 | { |
609 | at--; | |
610 | } | |
611 | else | |
612 | { | |
613 | ap--; | |
614 | } | |
615 | } | |
616 | } | |
617 | delete [] rans; | |
c72198f1 | 618 | } |
fdbea0ce | 619 | |
1c01b4f8 | 620 | if (!(fEventnum%fPrintfreq)) |
621 | { | |
622 | cout << " *AliCollider::MakeEvent* Run : " << fRunnum << " Event : " << fEventnum | |
623 | << endl; | |
624 | if (fNucl) | |
fdbea0ce | 625 | { |
1c01b4f8 | 626 | cout << " npart = " << npt << " ncol = " << ncol |
627 | << " ncolpp = " << ncols[0] << " ncolnp = " << ncols[1] | |
628 | << " ncolpn = " << ncols[2] << " ncolnn = " << ncols[3] << endl; | |
fdbea0ce | 629 | } |
1c01b4f8 | 630 | } |
fdbea0ce | 631 | |
fdbea0ce | 632 | if (!fEvent) |
633 | { | |
634 | fEvent=new AliEvent(); | |
635 | fEvent->SetOwner(); | |
47dddbe4 | 636 | fEvent->SetName(GetName()); |
637 | fEvent->SetTitle(GetTitle()); | |
fdbea0ce | 638 | } |
639 | ||
640 | fEvent->Reset(); | |
641 | fEvent->SetRunNumber(fRunnum); | |
642 | fEvent->SetEventNumber(fEventnum); | |
643 | ||
da17f667 | 644 | AliTrack t; |
645 | Ali3Vector p; | |
646 | AliPosition r,rx; | |
647 | Float_t v[3]; | |
fdbea0ce | 648 | AliVertex vert; |
47dddbe4 | 649 | Ali3Vector pproj,ptarg; |
da17f667 | 650 | |
fdbea0ce | 651 | if (fVertexmode) |
652 | { | |
653 | // Make sure the primary vertex gets correct location and Id=1 | |
da17f667 | 654 | v[0]=0; |
655 | v[1]=0; | |
656 | v[2]=0; | |
657 | r.SetPosition(v,"car"); | |
658 | v[0]=fResolution; | |
659 | v[1]=fResolution; | |
660 | v[2]=fResolution; | |
661 | r.SetPositionErrors(v,"car"); | |
662 | ||
fdbea0ce | 663 | vert.SetId(1); |
664 | vert.SetTrackCopy(0); | |
665 | vert.SetVertexCopy(0); | |
da17f667 | 666 | vert.SetPosition(r); |
fdbea0ce | 667 | fEvent->AddVertex(vert,0); |
668 | } | |
669 | ||
c72198f1 | 670 | Int_t kf=0; |
fdbea0ce | 671 | Float_t charge=0,mass=0; |
6aff9852 | 672 | TString name; |
fdbea0ce | 673 | |
fdbea0ce | 674 | Int_t ntypes=4; |
675 | ||
676 | // Singular settings for a normal Pythia elementary particle interation | |
677 | if (!fNucl) | |
678 | { | |
679 | ntypes=1; | |
680 | ncols[0]=1; | |
681 | } | |
682 | ||
683 | // Generate all the various collisions | |
47dddbe4 | 684 | fSelect=0; // Flag to indicate whether the total event is selected or not |
685 | Int_t select=0; // Flag to indicate whether the sub-event is selected or not | |
686 | Int_t first=1; // Flag to indicate the first collision process | |
da17f667 | 687 | Double_t pnucl; |
fdbea0ce | 688 | Int_t npart=0,ntk=0; |
689 | Double_t dist=0; | |
690 | for (Int_t itype=0; itype<ntypes; itype++) | |
691 | { | |
692 | if (fNucl) | |
693 | { | |
694 | if (itype==0 && ncols[itype]) Initialize(fFrame,"p","p",fWin); | |
695 | if (itype==1 && ncols[itype]) Initialize(fFrame,"n","p",fWin); | |
696 | if (itype==2 && ncols[itype]) Initialize(fFrame,"p","n",fWin); | |
697 | if (itype==3 && ncols[itype]) Initialize(fFrame,"n","n",fWin); | |
698 | } | |
699 | for (Int_t jcol=0; jcol<ncols[itype]; jcol++) | |
700 | { | |
701 | GenerateEvent(); | |
702 | ||
47dddbe4 | 703 | select=IsSelected(); |
704 | if (select) fSelect=1; | |
705 | ||
25eefd00 | 706 | if (first) // Store generator parameter information in the event structure |
da17f667 | 707 | { |
25eefd00 | 708 | // Enter generator parameters as a device in the event |
709 | AliSignal params; | |
710 | params.SetNameTitle("AliCollider","AliCollider generator parameters"); | |
711 | params.SetSlotName("Medit",1); | |
712 | params.SetSlotName("Vertexmode",2); | |
713 | params.SetSlotName("Resolution",3); | |
714 | params.SetSlotName("Userctrl",4); | |
715 | params.SetSlotName("Elastic",5); | |
716 | ||
717 | params.SetSignal(medit,1); | |
718 | params.SetSignal(fVertexmode,2); | |
719 | params.SetSignal(fResolution,3); | |
720 | params.SetSignal(fUserctrl,4); | |
721 | params.SetSignal(fElastic,5); | |
722 | ||
723 | // Store projectile and target information in the event structure | |
da17f667 | 724 | if (fNucl) |
725 | { | |
726 | v[0]=GetP(1,1); | |
727 | v[1]=GetP(1,2); | |
728 | v[2]=GetP(1,3); | |
47dddbe4 | 729 | pproj.SetVector(v,"car"); |
730 | pnucl=pproj.GetNorm(); | |
da17f667 | 731 | fEvent->SetProjectile(fAproj,fZproj,pnucl); |
732 | v[0]=GetP(2,1); | |
733 | v[1]=GetP(2,2); | |
734 | v[2]=GetP(2,3); | |
47dddbe4 | 735 | ptarg.SetVector(v,"car"); |
736 | pnucl=ptarg.GetNorm(); | |
da17f667 | 737 | fEvent->SetTarget(fAtarg,fZtarg,pnucl); |
25eefd00 | 738 | |
739 | params.AddNamedSlot("specmode"); | |
740 | params.AddNamedSlot("Specpmin"); | |
741 | params.AddNamedSlot("npart"); | |
742 | params.AddNamedSlot("ncolpp"); | |
743 | params.AddNamedSlot("ncolnp"); | |
744 | params.AddNamedSlot("ncolpn"); | |
745 | params.AddNamedSlot("ncolnn"); | |
746 | ||
747 | params.SetSignal(specmode,"specmode"); | |
748 | params.SetSignal(fSpecpmin,"Specpmin"); | |
749 | params.SetSignal(npt,"npart"); | |
750 | params.SetSignal(ncols[0],"ncolpp"); | |
751 | params.SetSignal(ncols[1],"ncolnp"); | |
752 | params.SetSignal(ncols[2],"ncolpn"); | |
753 | params.SetSignal(ncols[3],"ncolnn"); | |
da17f667 | 754 | } |
755 | else | |
756 | { | |
757 | v[0]=GetP(1,1); | |
758 | v[1]=GetP(1,2); | |
759 | v[2]=GetP(1,3); | |
760 | pnucl=sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); | |
761 | kf=GetK(1,2); | |
762 | fEvent->SetProjectile(0,0,pnucl,kf); | |
763 | v[0]=GetP(2,1); | |
764 | v[1]=GetP(2,2); | |
765 | v[2]=GetP(2,3); | |
766 | pnucl=sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); | |
767 | kf=GetK(2,2); | |
768 | fEvent->SetTarget(0,0,pnucl,kf); | |
769 | } | |
25eefd00 | 770 | |
771 | fEvent->AddDevice(params); | |
772 | ||
da17f667 | 773 | first=0; |
774 | } | |
775 | ||
776 | if (medit >= 0) Pyedit(medit); // Define which particles are to be kept | |
fdbea0ce | 777 | |
f4d1f676 | 778 | if (mlist>=0 && select) |
779 | { | |
780 | Pylist(mlist); | |
781 | cout << endl; | |
782 | } | |
fdbea0ce | 783 | |
c72198f1 | 784 | npart=GetN(); |
785 | for (Int_t jpart=1; jpart<=npart; jpart++) | |
fdbea0ce | 786 | { |
c72198f1 | 787 | kf=GetK(jpart,2); |
788 | charge=Pychge(kf)/3.; | |
789 | mass=GetP(jpart,5); | |
6aff9852 | 790 | name=GetPyname(kf); |
fdbea0ce | 791 | |
792 | // 3-momentum in GeV/c | |
c72198f1 | 793 | v[0]=GetP(jpart,1); |
794 | v[1]=GetP(jpart,2); | |
795 | v[2]=GetP(jpart,3); | |
fdbea0ce | 796 | p.SetVector(v,"car"); |
797 | ||
25eefd00 | 798 | // Production location in meter. |
799 | v[0]=GetV(jpart,1)/1000.; | |
800 | v[1]=GetV(jpart,2)/1000.; | |
801 | v[2]=GetV(jpart,3)/1000.; | |
da17f667 | 802 | r.SetPosition(v,"car"); |
fdbea0ce | 803 | |
804 | ntk++; | |
805 | ||
806 | t.Reset(); | |
807 | t.SetId(ntk); | |
808 | t.SetParticleCode(kf); | |
6aff9852 | 809 | t.SetName(name.Data()); |
fdbea0ce | 810 | t.SetCharge(charge); |
811 | t.SetMass(mass); | |
812 | t.Set3Momentum(p); | |
813 | t.SetBeginPoint(r); | |
814 | ||
815 | fEvent->AddTrack(t); | |
816 | ||
817 | // Build the vertex structures if requested | |
818 | if (fVertexmode) | |
819 | { | |
820 | // Check if track belongs within the resolution to an existing vertex | |
821 | Int_t add=0; | |
822 | for (Int_t jv=1; jv<=fEvent->GetNvertices(); jv++) | |
823 | { | |
824 | AliVertex* vx=fEvent->GetVertex(jv); | |
825 | if (vx) | |
826 | { | |
827 | rx=vx->GetPosition(); | |
828 | dist=rx.GetDistance(r); | |
829 | if (dist < fResolution) | |
830 | { | |
831 | AliTrack* tx=fEvent->GetIdTrack(ntk); | |
832 | if (tx) | |
833 | { | |
834 | vx->AddTrack(tx); | |
835 | add=1; | |
836 | } | |
837 | } | |
838 | } | |
839 | if (add) break; // No need to look further for vertex candidates | |
840 | } | |
841 | ||
842 | // If track was not close enough to an existing vertex | |
843 | // a new secondary vertex is created | |
844 | if (!add && fVertexmode>1) | |
845 | { | |
846 | AliTrack* tx=fEvent->GetIdTrack(ntk); | |
847 | if (tx) | |
848 | { | |
da17f667 | 849 | v[0]=fResolution; |
850 | v[1]=fResolution; | |
851 | v[2]=fResolution; | |
852 | r.SetPositionErrors(v,"car"); | |
fdbea0ce | 853 | vert.Reset(); |
854 | vert.SetTrackCopy(0); | |
855 | vert.SetVertexCopy(0); | |
856 | vert.SetId((fEvent->GetNvertices())+1); | |
857 | vert.SetPosition(r); | |
858 | vert.AddTrack(tx); | |
859 | fEvent->AddVertex(vert,0); | |
860 | } | |
861 | } | |
862 | } | |
863 | } // End of loop over the produced particles for each collision | |
864 | } // End of loop over number of collisions for each type | |
865 | } // End of loop over collision types | |
866 | ||
867 | // Link sec. vertices to primary if requested | |
868 | // Note that also the connecting tracks are automatically created | |
869 | if (fVertexmode>2) | |
870 | { | |
871 | AliVertex* vp=fEvent->GetIdVertex(1); // Primary vertex | |
872 | if (vp) | |
873 | { | |
874 | for (Int_t i=2; i<=fEvent->GetNvertices(); i++) | |
875 | { | |
876 | AliVertex* vx=fEvent->GetVertex(i); | |
877 | if (vx) | |
878 | { | |
879 | if (vx->GetId() != 1) vp->AddVertex(vx); | |
880 | } | |
881 | } | |
882 | } | |
883 | } | |
884 | ||
47dddbe4 | 885 | // Include the spectator tracks in the event structure. |
886 | if (fNucl && specmode) | |
887 | { | |
47dddbe4 | 888 | v[0]=0; |
889 | v[1]=0; | |
890 | v[2]=0; | |
891 | r.SetPosition(v,"car"); | |
892 | ||
893 | zp=fZproj-(ncols[0]+ncols[2]); | |
894 | if (zp<0) zp=0; | |
895 | ap=fAproj-(ncols[0]+ncols[1]+ncols[2]+ncols[3]); | |
896 | if (ap<0) ap=0; | |
897 | zt=fZtarg-(ncols[0]+ncols[1]); | |
898 | if (zt<0) zt=0; | |
899 | at=fAtarg-(ncols[0]+ncols[1]+ncols[2]+ncols[3]); | |
900 | if (at<0) at=0; | |
901 | ||
902 | Int_t nspec=0; | |
903 | ||
904 | if (pproj.GetNorm() > fSpecpmin) | |
905 | { | |
906 | kf=2212; // Projectile spectator protons | |
907 | charge=Pychge(kf)/3.; | |
6aff9852 | 908 | mass=GetPMAS(Pycomp(kf),1); |
909 | name=GetPyname(kf); | |
47dddbe4 | 910 | for (Int_t iprojp=1; iprojp<=zp; iprojp++) |
911 | { | |
912 | nspec++; | |
913 | t.Reset(); | |
914 | t.SetId(-nspec); | |
915 | t.SetParticleCode(kf); | |
6aff9852 | 916 | t.SetName(name.Data()); |
47dddbe4 | 917 | t.SetTitle("Projectile spectator proton"); |
918 | t.SetCharge(charge); | |
919 | t.SetMass(mass); | |
920 | t.Set3Momentum(pproj); | |
921 | t.SetBeginPoint(r); | |
922 | ||
923 | fEvent->AddTrack(t); | |
924 | } | |
925 | ||
926 | kf=2112; // Projectile spectator neutrons | |
927 | charge=Pychge(kf)/3.; | |
6aff9852 | 928 | mass=GetPMAS(Pycomp(kf),1); |
929 | name=GetPyname(kf); | |
47dddbe4 | 930 | for (Int_t iprojn=1; iprojn<=(ap-zp); iprojn++) |
931 | { | |
932 | nspec++; | |
933 | t.Reset(); | |
934 | t.SetId(-nspec); | |
935 | t.SetParticleCode(kf); | |
6aff9852 | 936 | t.SetName(name.Data()); |
47dddbe4 | 937 | t.SetTitle("Projectile spectator neutron"); |
938 | t.SetCharge(charge); | |
939 | t.SetMass(mass); | |
940 | t.Set3Momentum(pproj); | |
941 | t.SetBeginPoint(r); | |
942 | ||
943 | fEvent->AddTrack(t); | |
944 | } | |
945 | } | |
946 | ||
947 | if (ptarg.GetNorm() > fSpecpmin) | |
948 | { | |
949 | kf=2212; // Target spectator protons | |
950 | charge=Pychge(kf)/3.; | |
6aff9852 | 951 | mass=GetPMAS(Pycomp(kf),1); |
952 | name=GetPyname(kf); | |
47dddbe4 | 953 | for (Int_t itargp=1; itargp<=zt; itargp++) |
954 | { | |
955 | nspec++; | |
956 | t.Reset(); | |
957 | t.SetId(-nspec); | |
958 | t.SetParticleCode(kf); | |
6aff9852 | 959 | t.SetName(name.Data()); |
47dddbe4 | 960 | t.SetTitle("Target spectator proton"); |
961 | t.SetCharge(charge); | |
962 | t.SetMass(mass); | |
963 | t.Set3Momentum(ptarg); | |
964 | t.SetBeginPoint(r); | |
965 | ||
966 | fEvent->AddTrack(t); | |
967 | } | |
968 | ||
969 | kf=2112; // Target spectator neutrons | |
970 | charge=Pychge(kf)/3.; | |
6aff9852 | 971 | mass=GetPMAS(Pycomp(kf),1); |
972 | name=GetPyname(kf); | |
47dddbe4 | 973 | for (Int_t itargn=1; itargn<=(at-zt); itargn++) |
974 | { | |
975 | nspec++; | |
976 | t.Reset(); | |
977 | t.SetId(-nspec); | |
978 | t.SetParticleCode(kf); | |
6aff9852 | 979 | t.SetName(name.Data()); |
47dddbe4 | 980 | t.SetTitle("Target spectator neutron"); |
981 | t.SetCharge(charge); | |
982 | t.SetMass(mass); | |
983 | t.Set3Momentum(ptarg); | |
984 | t.SetBeginPoint(r); | |
985 | ||
986 | fEvent->AddTrack(t); | |
987 | } | |
988 | } | |
989 | ||
990 | // Link the spectator tracks to the primary vertex. | |
991 | if (fVertexmode) | |
992 | { | |
993 | AliVertex* vp=fEvent->GetIdVertex(1); | |
994 | if (vp) | |
995 | { | |
996 | for (Int_t ispec=1; ispec<=nspec; ispec++) | |
997 | { | |
998 | AliTrack* tx=fEvent->GetIdTrack(-ispec); | |
999 | if (tx) vp->AddTrack(tx); | |
1000 | } | |
1001 | } | |
1002 | } | |
1003 | } | |
1004 | ||
965bd237 | 1005 | if (!(fEventnum%fPrintfreq) && (mlist || fEvent)) |
1006 | { | |
1007 | if (fEvent) | |
1008 | { | |
1009 | cout << " Number of tracks in the event structure : " | |
1010 | << fEvent->GetNtracks() << endl; | |
1011 | } | |
1012 | cout << endl; // Create empty output line after the event | |
1013 | } | |
47dddbe4 | 1014 | |
1015 | if (fOutTree && fSelect) fOutTree->Fill(); | |
fdbea0ce | 1016 | } |
1017 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 1018 | AliEvent* AliCollider::GetEvent(Int_t select) const |
fdbea0ce | 1019 | { |
1020 | // Provide pointer to the generated event structure. | |
47dddbe4 | 1021 | // |
1022 | // select = 0 : Always return the pointer to the generated event. | |
1023 | // 1 : Only return the pointer to the generated event in case | |
1024 | // the event passed the selection criteria as specified via | |
1025 | // SelectEvent(). Otherwise the value 0 will be returned. | |
1026 | // | |
1027 | // By invoking GetEvent() the default of select=0 will be used. | |
1028 | ||
1029 | if (!select || fSelect) | |
1030 | { | |
1031 | return fEvent; | |
1032 | } | |
1033 | else | |
1034 | { | |
1035 | return 0; | |
1036 | } | |
fdbea0ce | 1037 | } |
1038 | /////////////////////////////////////////////////////////////////////////// | |
1039 | void AliCollider::EndRun() | |
1040 | { | |
1041 | // Properly close the output file (if needed). | |
1042 | if (fOutFile) | |
1043 | { | |
1044 | fOutFile->Write(); | |
1045 | fOutFile->Close(); | |
1046 | cout << " *AliCollider::EndRun* Output file correctly closed." << endl; | |
1047 | } | |
1048 | } | |
1049 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 1050 | void AliCollider::SetStable(Int_t id,Int_t mode) |
1051 | { | |
1052 | // Declare whether a particle must be regarded as stable or not. | |
1053 | // The parameter "id" indicates the Pythia KF particle code, which | |
1054 | // basically is the PDG particle identifier code. | |
1055 | // The parameter "mode" indicates the action to be taken. | |
1056 | // | |
1057 | // mode = 0 : Particle will be able to decay | |
1058 | // 1 : Particle will be regarded as stable. | |
1059 | // | |
1060 | // In case the user does NOT explicitly invoke this function, the standard | |
1061 | // Pythia settings for the decay tables are used. | |
1062 | // | |
1063 | // When this function is invoked without the "mode" argument, then the | |
1064 | // default of mode=1 will be used for the specified particle. | |
1065 | // | |
1066 | // Notes : | |
1067 | // ------- | |
1068 | // 1) This function should be invoked after the initialisation call | |
1069 | // to AliCollider::Init. | |
1070 | // 2) Due to the internals of Pythia, there is no need to specify particles | |
1071 | // and their corresponding anti-particles separately as (un)stable. | |
1072 | // Once a particle has been declared (un)stable, the corresponding | |
1073 | // anti-particle will be treated in the same way. | |
1074 | ||
1075 | if (mode==0 || mode==1) | |
1076 | { | |
1077 | Int_t kc=Pycomp(id); | |
1078 | Int_t decay=1-mode; | |
1079 | if (kc>0) | |
1080 | { | |
1081 | SetMDCY(kc,1,decay); | |
1082 | } | |
1083 | else | |
1084 | { | |
1085 | cout << " *AliCollider::SetStable* Unknown particle code. id = " << id << endl; | |
1086 | } | |
1087 | } | |
1088 | else | |
1089 | { | |
1090 | cout << " *AliCollider::SetStable* Invalid parameter. mode = " << mode << endl; | |
1091 | } | |
1092 | } | |
1093 | /////////////////////////////////////////////////////////////////////////// | |
47dddbe4 | 1094 | void AliCollider::SelectEvent(Int_t id) |
1095 | { | |
1096 | // Add a particle to the event selection list. | |
1097 | // The parameter "id" indicates the Pythia KF particle code, which | |
1098 | // basically is the PDG particle identifier code. | |
1099 | // In case the user has built a selection list via this procedure, only the | |
1100 | // events in which one of the particles specified in the list was generated | |
1101 | // will be kept. | |
1102 | // The investigation of the generated particles takes place when the complete | |
1103 | // event is in memory, including all (shortlived) mother particles and resonances. | |
1104 | // So, the settings of the various particle decay modes have no influence on | |
1105 | // the event selection described here. | |
1106 | // | |
1107 | // If no list has been specified, all events will be accepted. | |
1108 | // | |
1109 | // Note : id=0 will delete the selection list. | |
1110 | // | |
1111 | // Be aware of the fact that severe selection criteria (i.e. selecting only | |
1112 | // rare events) may result in long runtimes before an event sample has been | |
1113 | // obtained. | |
1114 | // | |
1115 | if (!id) | |
1116 | { | |
1117 | if (fSelections) | |
1118 | { | |
1119 | delete fSelections; | |
1120 | fSelections=0; | |
1121 | } | |
1122 | } | |
1123 | else | |
1124 | { | |
1125 | Int_t kc=Pycomp(id); | |
1126 | if (!fSelections) | |
1127 | { | |
1128 | fSelections=new TArrayI(1); | |
1129 | fSelections->AddAt(kc,0); | |
1130 | } | |
1131 | else | |
1132 | { | |
1133 | Int_t exist=0; | |
1134 | Int_t size=fSelections->GetSize(); | |
1135 | for (Int_t i=0; i<size; i++) | |
1136 | { | |
1137 | if (kc==fSelections->At(i)) | |
1138 | { | |
1139 | exist=1; | |
1140 | break; | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | if (!exist) | |
1145 | { | |
1146 | fSelections->Set(size+1); | |
1147 | fSelections->AddAt(kc,size); | |
1148 | } | |
1149 | } | |
1150 | } | |
1151 | } | |
1152 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 1153 | Int_t AliCollider::GetSelectionFlag() const |
47dddbe4 | 1154 | { |
1155 | // Return the value of the selection flag for the total event. | |
1156 | // When the event passed the selection criteria as specified via | |
1157 | // SelectEvent() the value 1 is returned, otherwise the value 0 is returned. | |
1158 | return fSelect; | |
1159 | } | |
1160 | /////////////////////////////////////////////////////////////////////////// | |
1161 | Int_t AliCollider::IsSelected() | |
1162 | { | |
1163 | // Check whether the generated (sub)event contains one of the particles | |
1164 | // specified in the selection list via SelectEvent(). | |
1165 | // If this is the case or when no selection list is present, the value 1 | |
1166 | // will be returned, indicating the event is selected to be kept. | |
1167 | // Otherwise the value 0 will be returned. | |
1168 | ||
1169 | if (!fSelections) return 1; | |
1170 | ||
1171 | Int_t nsel=fSelections->GetSize(); | |
1172 | Int_t npart=GetN(); | |
1173 | Int_t kf,kc; | |
1174 | ||
1175 | Int_t select=0; | |
1176 | for (Int_t jpart=1; jpart<=npart; jpart++) | |
1177 | { | |
1178 | kf=GetK(jpart,2); | |
1179 | kc=Pycomp(kf); | |
1180 | for (Int_t i=0; i<nsel; i++) | |
1181 | { | |
1182 | if (kc==fSelections->At(i)) | |
1183 | { | |
1184 | select=1; | |
1185 | break; | |
1186 | } | |
1187 | } | |
1188 | if (select) break; | |
1189 | } | |
1190 | return select; | |
1191 | } | |
1192 | /////////////////////////////////////////////////////////////////////////// | |
1193 | void AliCollider::SetSpectatorPmin(Float_t pmin) | |
1194 | { | |
1195 | // Set minimal momentum in GeV/c for spectator tracks to be stored. | |
1196 | // Spectator tracks with a momentum below this threshold will not be stored | |
1197 | // in the (output) event structure. | |
1198 | // This facility allows to minimise the output file size. | |
1199 | // Note that when the user wants to boost the event into another reference | |
1200 | // frame these spectator tracks might have got momenta above the threshold. | |
1201 | // However, when the spectator tracks were not stored in the event structure | |
1202 | // in the original frame, there is no way to retreive them anymore. | |
1203 | fSpecpmin=pmin; | |
1204 | } | |
1205 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 1206 | Float_t AliCollider::GetSpectatorPmin() const |
47dddbe4 | 1207 | { |
1208 | // Provide the minimal spectator momentum in GeV/c. | |
1209 | return fSpecpmin; | |
1210 | } | |
1211 | /////////////////////////////////////////////////////////////////////////// | |
6aff9852 | 1212 | TString AliCollider::GetPyname(Int_t kf) |
1213 | { | |
1214 | // Provide the correctly truncated Pythia particle name for PGD code kf | |
1215 | // | |
1216 | // The TPythia6::Pyname returned name is copied into a TString and truncated | |
1217 | // at the first blank to prevent funny trailing characters due to incorrect | |
1218 | // stripping of empty characters in TPythia6::Pyname. | |
1219 | // The truncation at the first blank is allowed due to the Pythia convention | |
1220 | // that particle names never contain blanks. | |
1221 | char name[16]; | |
1222 | TString sname; | |
1223 | Pyname(kf,name); | |
1224 | sname=name[0]; | |
1225 | for (Int_t i=1; i<16; i++) | |
1226 | { | |
1227 | if (name[i]==' ') break; | |
1228 | sname=sname+name[i]; | |
1229 | } | |
1230 | return sname; | |
1231 | } | |
1232 | /////////////////////////////////////////////////////////////////////////// |