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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 | ||
b09247a2 | 114 | #include <cstdlib> |
fdbea0ce | 115 | #include "AliCollider.h" |
c72198f1 | 116 | #include "Riostream.h" |
fdbea0ce | 117 | |
118 | ClassImp(AliCollider) // Class implementation to enable ROOT I/O | |
119 | ||
c72198f1 | 120 | AliCollider::AliCollider() : TPythia6() |
fdbea0ce | 121 | { |
122 | // Default constructor. | |
123 | // All variables initialised to default values. | |
965bd237 | 124 | // |
125 | // Some Pythia default MC parameters are automatically modified to provide | |
126 | // more suitable running conditions for soft processes in view of | |
127 | // nucleus-nucleus interactions and astrophysical processes. | |
128 | // The user may initialise the generator with all the default Pythia | |
129 | // parameters and obtain full user control to modify the settings by means | |
130 | // of the SetUserControl memberfunction. | |
131 | // | |
132 | // Refer to the SetElastic memberfunction for the inclusion of elastic | |
133 | // and diffractive processes. | |
134 | // By default these processes are not included. | |
135 | ||
fdbea0ce | 136 | fVertexmode=0; // No vertex structure creation |
25eefd00 | 137 | fResolution=1e-7; // Standard resolution is 0.1 micron |
fdbea0ce | 138 | fRunnum=0; |
139 | fEventnum=0; | |
140 | fPrintfreq=1; | |
965bd237 | 141 | fUserctrl=0; // Automatic optimisation of some MC parameters |
142 | fElastic=0; // No elastic and diffractive processes | |
fdbea0ce | 143 | |
144 | fEvent=0; | |
145 | ||
47dddbe4 | 146 | fSpecpmin=0; |
147 | ||
fdbea0ce | 148 | fFrame="none"; |
149 | fWin=0; | |
150 | ||
151 | fNucl=0; | |
152 | fZproj=0; | |
153 | fAproj=0; | |
154 | fZtarg=0; | |
155 | fAtarg=0; | |
156 | fFracpp=0; | |
157 | fFracnp=0; | |
158 | fFracpn=0; | |
159 | fFracnn=0; | |
160 | ||
161 | fOutFile=0; | |
162 | fOutTree=0; | |
47dddbe4 | 163 | |
164 | fSelections=0; | |
165 | fSelect=0; | |
166 | ||
167 | TString s=GetName(); | |
168 | s+=" (AliCollider)"; | |
169 | SetName(s.Data()); | |
fdbea0ce | 170 | } |
171 | /////////////////////////////////////////////////////////////////////////// | |
172 | AliCollider::~AliCollider() | |
173 | { | |
174 | // Default destructor | |
175 | if (fEvent) | |
176 | { | |
177 | delete fEvent; | |
178 | fEvent=0; | |
179 | } | |
180 | if (fOutFile) | |
181 | { | |
182 | delete fOutFile; | |
183 | fOutFile=0; | |
184 | } | |
185 | if (fOutTree) | |
186 | { | |
187 | delete fOutTree; | |
188 | fOutTree=0; | |
189 | } | |
47dddbe4 | 190 | if (fSelections) |
191 | { | |
192 | delete fSelections; | |
193 | fSelections=0; | |
194 | } | |
fdbea0ce | 195 | } |
196 | /////////////////////////////////////////////////////////////////////////// | |
197 | void AliCollider::SetOutputFile(TString s) | |
198 | { | |
199 | // Create the output file containing all the data in ROOT output format. | |
200 | if (fOutFile) | |
201 | { | |
202 | delete fOutFile; | |
203 | fOutFile=0; | |
204 | } | |
205 | fOutFile=new TFile(s.Data(),"RECREATE","AliCollider data"); | |
206 | ||
207 | if (fOutTree) | |
208 | { | |
209 | delete fOutTree; | |
210 | fOutTree=0; | |
211 | } | |
212 | fOutTree=new TTree("T","AliCollider event data"); | |
213 | ||
214 | Int_t bsize=32000; | |
215 | Int_t split=0; | |
216 | fOutTree->Branch("Events","AliEvent",&fEvent,bsize,split); | |
217 | } | |
218 | /////////////////////////////////////////////////////////////////////////// | |
219 | void AliCollider::SetVertexMode(Int_t mode) | |
220 | { | |
221 | // Set the mode of the vertex structure creation. | |
222 | // | |
223 | // By default all generated tracks will only appear in the AliEvent | |
224 | // structure without any primary (and secondary) vertex structure. | |
225 | // The user can build the vertex structure if he/she wants by means | |
226 | // of the beginpoint location of each AliTrack. | |
227 | // | |
228 | // However, one can also let AliCollider automatically create | |
229 | // the primary (and secondary) vertex structure(s). | |
230 | // In this case the primary vertex is given Id=1 and all sec. vertices | |
231 | // are given Id's 2,3,4,.... | |
232 | // All vertices are created as standalone entities in the AliEvent structure | |
233 | // without any linking between the various vertices. | |
234 | // For this automated process, the user-selected resolution | |
235 | // (see SetResolution) is used to decide whether or not certain vertex | |
236 | // locations can be resolved. | |
237 | // In case no vertex creation is selected (i.e. the default mode=0), | |
238 | // the value of the resolution is totally irrelevant. | |
239 | // | |
240 | // The user can also let AliCollider automatically connect the sec. vertices | |
241 | // to the primary vertex (i.e. mode=3). This process will also automatically | |
242 | // generate the tracks connecting the vertices. | |
243 | // Note that the result of the mode=3 operation may be very sensitive to | |
244 | // the resolution parameter. Therefore, no attempt is made to distinguish | |
245 | // between secondary, tertiary etc... vertices. All sec. vertices are | |
246 | // linked to the primary one. | |
247 | // | |
248 | // Irrespective of the selected mode, all generated tracks can be obtained | |
249 | // directly from the AliEvent structure. | |
250 | // In case (sec.) vertex creation is selected, all generated vertices can | |
251 | // also be obtained directly from the AliEvent structure. | |
252 | // These (sec.) vertices contain only the corresponding pointers to the various | |
253 | // tracks which are stored in the AliEvent structure. | |
254 | // | |
255 | // Overview of vertex creation modes : | |
256 | // ----------------------------------- | |
257 | // mode = 0 ==> No vertex structure will be created | |
258 | // 1 ==> Only primary vertex structure will be created | |
259 | // 2 ==> Unconnected primary and secondary vertices will be created | |
260 | // 3 ==> Primary and secondary vertices will be created where all the | |
261 | // sec. vertices will be connected to the primary vertex. | |
262 | // Also the vertex connecting tracks will be automatically | |
263 | // generated. | |
264 | // | |
265 | if (mode<0 || mode >3) | |
266 | { | |
267 | cout << " *AliCollider::SetVertexMode* Invalid argument mode : " << mode << endl; | |
268 | fVertexmode=0; | |
269 | } | |
270 | else | |
271 | { | |
272 | fVertexmode=mode; | |
273 | } | |
274 | } | |
275 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 276 | Int_t AliCollider::GetVertexMode() const |
fdbea0ce | 277 | { |
278 | // Provide the current mode for vertex structure creation. | |
279 | return fVertexmode; | |
280 | } | |
281 | /////////////////////////////////////////////////////////////////////////// | |
282 | void AliCollider::SetResolution(Double_t res) | |
283 | { | |
25eefd00 | 284 | // Set the resolution (in meter) for resolving (sec.) vertices. |
fdbea0ce | 285 | // By default this resolution is set to 0.1 micron. |
286 | // Note : In case no vertex creation has been selected, the value of | |
287 | // the resolution is totally irrelevant. | |
288 | fResolution=fabs(res); | |
289 | } | |
290 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 291 | Double_t AliCollider::GetResolution() const |
fdbea0ce | 292 | { |
25eefd00 | 293 | // Provide the current resolution (in meter) for resolving (sec.) vertices. |
fdbea0ce | 294 | return fResolution; |
295 | } | |
296 | /////////////////////////////////////////////////////////////////////////// | |
297 | void AliCollider::SetRunNumber(Int_t run) | |
298 | { | |
299 | // Set the user defined run number. | |
300 | // By default the run number is set to 0. | |
301 | fRunnum=run; | |
302 | } | |
303 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 304 | Int_t AliCollider::GetRunNumber() const |
fdbea0ce | 305 | { |
306 | // Provide the user defined run number. | |
307 | return fRunnum; | |
308 | } | |
309 | /////////////////////////////////////////////////////////////////////////// | |
310 | void AliCollider::SetPrintFreq(Int_t n) | |
311 | { | |
312 | // Set the print frequency for every 'n' events. | |
313 | // By default the printfrequency is set to 1 (i.e. every event). | |
314 | fPrintfreq=n; | |
315 | } | |
316 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 317 | Int_t AliCollider::GetPrintFreq() const |
fdbea0ce | 318 | { |
319 | // Provide the user selected print frequency. | |
320 | return fPrintfreq; | |
321 | } | |
322 | /////////////////////////////////////////////////////////////////////////// | |
965bd237 | 323 | void AliCollider::SetUserControl(Int_t flag) |
324 | { | |
325 | // Set the user control flag w.r.t. disabling automatic optimisation | |
326 | // of some Pythia default MC parameters for soft interactions in view of | |
327 | // nucleus-nucleus collisions and astrophysical processes. | |
328 | // Flag = 0 : Limited user control (automatic optimisation enabled) | |
329 | // 1 : Full user control (automatic optimisation disabled) | |
330 | // By default the user control is set to 0 (i.e. automatic optimisation). | |
331 | // See the Init() memberfunctions for further details w.r.t. the optimisations. | |
332 | fUserctrl=flag; | |
333 | } | |
334 | /////////////////////////////////////////////////////////////////////////// | |
335 | Int_t AliCollider::GetUserControl() const | |
336 | { | |
337 | // Provide the value of the user control flag. | |
338 | return fUserctrl; | |
339 | } | |
340 | /////////////////////////////////////////////////////////////////////////// | |
341 | void AliCollider::SetElastic(Int_t flag) | |
342 | { | |
343 | // Set the flag w.r.t. inclusion of elastic and diffractive processes. | |
344 | // By default these processes are not included. | |
345 | // Flag = 0 : Do not include elastic and diffractive processes | |
346 | // 1 : Elastic and diffractive processes will be included | |
347 | fElastic=flag; | |
348 | } | |
349 | /////////////////////////////////////////////////////////////////////////// | |
350 | Int_t AliCollider::GetElastic() const | |
351 | { | |
352 | // Provide the value of the control flag for elastic and diffractive processes. | |
353 | return fElastic; | |
354 | } | |
355 | /////////////////////////////////////////////////////////////////////////// | |
fdbea0ce | 356 | void AliCollider::Init(char* frame,char* beam,char* target,Float_t win) |
357 | { | |
358 | // Initialisation of the underlying Pythia generator package. | |
965bd237 | 359 | // The event number is reset to 0. |
fdbea0ce | 360 | // This routine just invokes TPythia6::Initialize(...) and the arguments |
361 | // have the corresponding meaning. | |
965bd237 | 362 | // Some Pythia default MC parameters are automatically modified to provide |
363 | // more suitable running conditions for soft processes in view of | |
364 | // astrophysical processes. | |
365 | // The optimisations consist of : | |
25eefd00 | 366 | // * Usage of real photons for photon beams or targets |
965bd237 | 367 | // * Minimum CMS energy of 3 GeV for the event |
368 | // * Activation of the default K factor values | |
369 | // with separate settings for ordinary and color annihilation graphs. | |
370 | // The user may initialise the generator with all the default Pythia | |
371 | // parameters and obtain full user control to modify the settings by means | |
372 | // of invoking the SetUserControl memberfunction before this initialisation. | |
373 | // Note that the inclusion of elastic and diffractive processes is controlled | |
374 | // by invokation of the SetElastic memberfunction before this initialisation, | |
375 | // irrespective of the UserControl selection. | |
376 | ||
377 | if (!fUserctrl) // Optimisation of some MC parameters | |
378 | { | |
379 | SetMSTP(14,10); // Real photons for photon beams or targets | |
380 | SetPARP(2,3.); // Minimum CMS energy for the event | |
381 | SetMSTP(33,2); // Activate K factor. Separate for ordinary and color annih. graphs | |
382 | } | |
383 | ||
384 | if (fElastic) SetMSEL(2); // Include low-Pt, elastic and diffractive events | |
385 | ||
fdbea0ce | 386 | fEventnum=0; |
387 | fNucl=0; | |
388 | fFrame=frame; | |
389 | fWin=win; | |
390 | Initialize(frame,beam,target,win); | |
c72198f1 | 391 | |
e313997a | 392 | cout << endl; |
c72198f1 | 393 | cout << " *AliCollider::Init* Standard Pythia initialisation." << endl; |
394 | cout << " Beam particle : " << beam << " Target particle : " << target | |
395 | << " Frame = " << frame << " Energy = " << win | |
396 | << endl; | |
fdbea0ce | 397 | } |
398 | /////////////////////////////////////////////////////////////////////////// | |
399 | void AliCollider::Init(char* frame,Int_t zp,Int_t ap,Int_t zt,Int_t at,Float_t win) | |
400 | { | |
401 | // Initialisation of the underlying Pythia generator package for the generation | |
402 | // of nucleus-nucleus interactions. | |
965bd237 | 403 | // The event number is reset to 0. |
fdbea0ce | 404 | // In addition to the Pythia standard arguments 'frame' and 'win', the user |
da17f667 | 405 | // can specify here (Z,A) values of the projectile and target nuclei. |
406 | // | |
407 | // Note : The 'win' value denotes either the cms energy per nucleon-nucleon collision | |
408 | // (i.e. frame="cms") or the momentum per nucleon in all other cases. | |
409 | // | |
965bd237 | 410 | // Some Pythia default MC parameters are automatically modified to provide |
411 | // more suitable running conditions for soft processes in view of | |
412 | // nucleus-nucleus interactions and astrophysical processes. | |
413 | // The optimisations consist of : | |
414 | // * Minimum CMS energy of 3 GeV for the event | |
415 | // * Activation of the default K factor values | |
416 | // with separate settings for ordinary and color annihilation graphs. | |
417 | // The user may initialise the generator with all the default Pythia | |
418 | // parameters and obtain full user control to modify the settings by means | |
419 | // of invoking the SetUserControl memberfunction before this initialisation. | |
420 | // Note that the inclusion of elastic and diffractive processes is controlled | |
421 | // by invokation of the SetElastic memberfunction before this initialisation, | |
422 | // irrespective of the UserControl selection. | |
423 | ||
424 | if (!fUserctrl) // Optimisation of some MC parameters | |
425 | { | |
426 | SetPARP(2,3.); // Minimum CMS energy for the event | |
427 | SetMSTP(33,2); // Activate K factor. Separate for ordinary and color annih. graphs | |
428 | } | |
429 | ||
430 | if (fElastic) SetMSEL(2); // Include low-Pt, elastic and diffractive events | |
431 | ||
fdbea0ce | 432 | fEventnum=0; |
433 | fNucl=1; | |
434 | fFrame=frame; | |
435 | fWin=win; | |
436 | fZproj=0; | |
437 | fAproj=0; | |
438 | fZtarg=0; | |
439 | fAtarg=0; | |
440 | fFracpp=0; | |
441 | fFracnp=0; | |
442 | fFracpn=0; | |
443 | fFracnn=0; | |
444 | ||
445 | if (ap<1 || at<1 || zp>ap || zt>at) | |
446 | { | |
e313997a | 447 | cout << endl; |
fdbea0ce | 448 | cout << " *AliCollider::Init* Invalid input value(s). Zproj = " << zp |
449 | << " Aproj = " << ap << " Ztarg = " << zt << " Atarg = " << at << endl; | |
450 | return; | |
451 | } | |
452 | ||
453 | fZproj=zp; | |
454 | fAproj=ap; | |
455 | fZtarg=zt; | |
456 | fAtarg=at; | |
457 | ||
e313997a | 458 | cout << endl; |
fdbea0ce | 459 | cout << " *AliCollider::Init* Nucleus-Nucleus generator initialisation." << endl; |
460 | cout << " Zproj = " << zp << " Aproj = " << ap << " Ztarg = " << zt << " Atarg = " << at | |
461 | << " Frame = " << frame << " Energy = " << win | |
462 | << endl; | |
463 | } | |
464 | /////////////////////////////////////////////////////////////////////////// | |
465 | void AliCollider::GetFractions(Float_t zp,Float_t ap,Float_t zt,Float_t at) | |
466 | { | |
467 | // Determine the fractions for the various N-N collision processes. | |
468 | // The various processes are : p+p, n+p, p+n and n+n. | |
469 | if (zp<0) zp=0; | |
470 | if (zt<0) zt=0; | |
471 | ||
472 | fFracpp=0; | |
473 | fFracnp=0; | |
474 | fFracpn=0; | |
475 | fFracnn=0; | |
476 | ||
477 | if (ap>0 && at>0) | |
478 | { | |
479 | fFracpp=(zp/ap)*(zt/at); | |
480 | fFracnp=(1.-zp/ap)*(zt/at); | |
481 | fFracpn=(zp/ap)*(1.-zt/at); | |
482 | fFracnn=(1.-zp/ap)*(1.-zt/at); | |
483 | } | |
484 | } | |
485 | /////////////////////////////////////////////////////////////////////////// | |
486 | void AliCollider::MakeEvent(Int_t npt,Int_t mlist,Int_t medit) | |
487 | { | |
488 | // Generate one event. | |
489 | // In case of a nucleus-nucleus interaction, the argument 'npt' denotes | |
490 | // the number of participant nucleons. | |
47dddbe4 | 491 | // Normally also the spectator tracks will be stored into the event structure. |
492 | // The spectator tracks have a negative user Id to distinguish them from the | |
493 | // ordinary generated tracks. | |
494 | // In case the user has selected the creation of vertex structures, the spectator | |
495 | // tracks will be linked to the primary vertex. | |
496 | // However, specification of npt<0 will suppress the storage of spectator tracks. | |
497 | // In the latter case abs(npt) will be taken as the number of participants. | |
fdbea0ce | 498 | // In case of a standard Pythia run for 'elementary' particle interactions, |
499 | // the value of npt is totally irrelevant. | |
da17f667 | 500 | // |
fdbea0ce | 501 | // The argument 'mlist' denotes the list mode used for Pylist(). |
da17f667 | 502 | // Note : mlist<0 suppresses the invokation of Pylist(). |
503 | // By default, no listing is produced (i.e. mlist=-1). | |
504 | // | |
c72198f1 | 505 | // The argument 'medit' denotes the edit mode used for Pyedit(). |
506 | // Note : medit<0 suppresses the invokation of Pyedit(). | |
507 | // By default, only 'stable' final particles are kept (i.e. medit=1). | |
508 | // | |
da17f667 | 509 | // In the case of a standard Pythia run concerning 'elementary' particle |
510 | // interactions, the projectile and target particle ID's for the created | |
511 | // event structure are set to the corresponding Pythia KF codes. | |
512 | // All the A and Z values are in that case set to zero. | |
513 | // In case of a nucleus-nucleus interaction, the proper A and Z values for | |
514 | // the projectile and target particles are set in the event structure. | |
515 | // However, in this case both particle ID's are set to zero. | |
47dddbe4 | 516 | // |
517 | // Note : Only in case an event passed the selection criteria as specified | |
518 | // via SelectEvent(), the event will appear on the output file. | |
fdbea0ce | 519 | |
520 | fEventnum++; | |
521 | ||
47dddbe4 | 522 | Int_t specmode=1; |
523 | if (npt<0) | |
524 | { | |
525 | specmode=0; | |
526 | npt=abs(npt); | |
527 | } | |
528 | ||
fdbea0ce | 529 | // Counters for the various (proj,targ) combinations : p+p, n+p, p+n and n+n |
530 | Int_t ncols[4]={0,0,0,0}; | |
531 | ||
47dddbe4 | 532 | Int_t zp=0; |
533 | Int_t ap=0; | |
534 | Int_t zt=0; | |
535 | Int_t at=0; | |
536 | ||
c72198f1 | 537 | Int_t ncol=1; |
fdbea0ce | 538 | if (fNucl) |
539 | { | |
540 | if (npt<1 || npt>(fAproj+fAtarg)) | |
541 | { | |
542 | cout << " *AliCollider::MakeEvent* Invalid input value. npt = " << npt | |
543 | << " Aproj = " << fAproj << " Atarg = " << fAtarg << endl; | |
544 | return; | |
545 | } | |
546 | ||
547 | // Determine the number of nucleon-nucleon collisions | |
c72198f1 | 548 | ncol=npt/2; |
fdbea0ce | 549 | if (npt%2 && fRan.Uniform()>0.5) ncol+=1; |
550 | ||
551 | // Determine the number of the various types of N+N interactions | |
47dddbe4 | 552 | zp=fZproj; |
553 | ap=fAproj; | |
554 | zt=fZtarg; | |
555 | at=fAtarg; | |
fdbea0ce | 556 | Int_t maxa=2; // Indicator whether proj (1) or target (2) has maximal A left |
557 | if (ap>at) maxa=1; | |
558 | Float_t* rans=new Float_t[ncol]; | |
559 | fRan.Uniform(rans,ncol); | |
560 | Float_t rndm=0; | |
561 | for (Int_t i=0; i<ncol; i++) | |
562 | { | |
563 | GetFractions(zp,ap,zt,at); | |
564 | rndm=rans[i]; | |
565 | if (rndm<=fFracpp) // p+p interaction | |
566 | { | |
567 | ncols[0]++; | |
4b570fab | 568 | if (maxa==2) |
fdbea0ce | 569 | { |
570 | at--; | |
571 | zt--; | |
572 | } | |
573 | else | |
574 | { | |
575 | ap--; | |
576 | zp--; | |
577 | } | |
578 | } | |
579 | if (rndm>fFracpp && rndm<=(fFracpp+fFracnp)) // n+p interaction | |
580 | { | |
581 | ncols[1]++; | |
4b570fab | 582 | if (maxa==2) |
fdbea0ce | 583 | { |
584 | at--; | |
585 | zt--; | |
586 | } | |
587 | else | |
588 | { | |
589 | ap--; | |
590 | } | |
591 | } | |
592 | if (rndm>(fFracpp+fFracnp) && rndm<=(fFracpp+fFracnp+fFracpn)) // p+n interaction | |
593 | { | |
594 | ncols[2]++; | |
4b570fab | 595 | if (maxa==2) |
fdbea0ce | 596 | { |
597 | at--; | |
598 | } | |
599 | else | |
600 | { | |
601 | ap--; | |
602 | zp--; | |
603 | } | |
604 | } | |
605 | if (rndm>(fFracpp+fFracnp+fFracpn)) // n+n interaction | |
606 | { | |
607 | ncols[3]++; | |
4b570fab | 608 | if (maxa==2) |
fdbea0ce | 609 | { |
610 | at--; | |
611 | } | |
612 | else | |
613 | { | |
614 | ap--; | |
615 | } | |
616 | } | |
617 | } | |
618 | delete [] rans; | |
c72198f1 | 619 | } |
fdbea0ce | 620 | |
1c01b4f8 | 621 | if (!(fEventnum%fPrintfreq)) |
622 | { | |
623 | cout << " *AliCollider::MakeEvent* Run : " << fRunnum << " Event : " << fEventnum | |
624 | << endl; | |
625 | if (fNucl) | |
fdbea0ce | 626 | { |
1c01b4f8 | 627 | cout << " npart = " << npt << " ncol = " << ncol |
628 | << " ncolpp = " << ncols[0] << " ncolnp = " << ncols[1] | |
629 | << " ncolpn = " << ncols[2] << " ncolnn = " << ncols[3] << endl; | |
fdbea0ce | 630 | } |
1c01b4f8 | 631 | } |
fdbea0ce | 632 | |
fdbea0ce | 633 | if (!fEvent) |
634 | { | |
635 | fEvent=new AliEvent(); | |
636 | fEvent->SetOwner(); | |
47dddbe4 | 637 | fEvent->SetName(GetName()); |
638 | fEvent->SetTitle(GetTitle()); | |
fdbea0ce | 639 | } |
640 | ||
641 | fEvent->Reset(); | |
642 | fEvent->SetRunNumber(fRunnum); | |
643 | fEvent->SetEventNumber(fEventnum); | |
644 | ||
da17f667 | 645 | AliTrack t; |
646 | Ali3Vector p; | |
647 | AliPosition r,rx; | |
648 | Float_t v[3]; | |
fdbea0ce | 649 | AliVertex vert; |
47dddbe4 | 650 | Ali3Vector pproj,ptarg; |
da17f667 | 651 | |
fdbea0ce | 652 | if (fVertexmode) |
653 | { | |
654 | // Make sure the primary vertex gets correct location and Id=1 | |
da17f667 | 655 | v[0]=0; |
656 | v[1]=0; | |
657 | v[2]=0; | |
658 | r.SetPosition(v,"car"); | |
659 | v[0]=fResolution; | |
660 | v[1]=fResolution; | |
661 | v[2]=fResolution; | |
662 | r.SetPositionErrors(v,"car"); | |
663 | ||
fdbea0ce | 664 | vert.SetId(1); |
665 | vert.SetTrackCopy(0); | |
666 | vert.SetVertexCopy(0); | |
da17f667 | 667 | vert.SetPosition(r); |
fdbea0ce | 668 | fEvent->AddVertex(vert,0); |
669 | } | |
670 | ||
c72198f1 | 671 | Int_t kf=0; |
fdbea0ce | 672 | Float_t charge=0,mass=0; |
6aff9852 | 673 | TString name; |
fdbea0ce | 674 | |
fdbea0ce | 675 | Int_t ntypes=4; |
676 | ||
677 | // Singular settings for a normal Pythia elementary particle interation | |
678 | if (!fNucl) | |
679 | { | |
680 | ntypes=1; | |
681 | ncols[0]=1; | |
682 | } | |
683 | ||
684 | // Generate all the various collisions | |
47dddbe4 | 685 | fSelect=0; // Flag to indicate whether the total event is selected or not |
686 | Int_t select=0; // Flag to indicate whether the sub-event is selected or not | |
687 | Int_t first=1; // Flag to indicate the first collision process | |
da17f667 | 688 | Double_t pnucl; |
fdbea0ce | 689 | Int_t npart=0,ntk=0; |
690 | Double_t dist=0; | |
691 | for (Int_t itype=0; itype<ntypes; itype++) | |
692 | { | |
693 | if (fNucl) | |
694 | { | |
695 | if (itype==0 && ncols[itype]) Initialize(fFrame,"p","p",fWin); | |
696 | if (itype==1 && ncols[itype]) Initialize(fFrame,"n","p",fWin); | |
697 | if (itype==2 && ncols[itype]) Initialize(fFrame,"p","n",fWin); | |
698 | if (itype==3 && ncols[itype]) Initialize(fFrame,"n","n",fWin); | |
699 | } | |
700 | for (Int_t jcol=0; jcol<ncols[itype]; jcol++) | |
701 | { | |
702 | GenerateEvent(); | |
703 | ||
47dddbe4 | 704 | select=IsSelected(); |
705 | if (select) fSelect=1; | |
706 | ||
25eefd00 | 707 | if (first) // Store generator parameter information in the event structure |
da17f667 | 708 | { |
25eefd00 | 709 | // Enter generator parameters as a device in the event |
710 | AliSignal params; | |
711 | params.SetNameTitle("AliCollider","AliCollider generator parameters"); | |
712 | params.SetSlotName("Medit",1); | |
713 | params.SetSlotName("Vertexmode",2); | |
714 | params.SetSlotName("Resolution",3); | |
715 | params.SetSlotName("Userctrl",4); | |
716 | params.SetSlotName("Elastic",5); | |
717 | ||
718 | params.SetSignal(medit,1); | |
719 | params.SetSignal(fVertexmode,2); | |
720 | params.SetSignal(fResolution,3); | |
721 | params.SetSignal(fUserctrl,4); | |
722 | params.SetSignal(fElastic,5); | |
723 | ||
724 | // Store projectile and target information in the event structure | |
da17f667 | 725 | if (fNucl) |
726 | { | |
727 | v[0]=GetP(1,1); | |
728 | v[1]=GetP(1,2); | |
729 | v[2]=GetP(1,3); | |
47dddbe4 | 730 | pproj.SetVector(v,"car"); |
731 | pnucl=pproj.GetNorm(); | |
da17f667 | 732 | fEvent->SetProjectile(fAproj,fZproj,pnucl); |
733 | v[0]=GetP(2,1); | |
734 | v[1]=GetP(2,2); | |
735 | v[2]=GetP(2,3); | |
47dddbe4 | 736 | ptarg.SetVector(v,"car"); |
737 | pnucl=ptarg.GetNorm(); | |
da17f667 | 738 | fEvent->SetTarget(fAtarg,fZtarg,pnucl); |
25eefd00 | 739 | |
740 | params.AddNamedSlot("specmode"); | |
741 | params.AddNamedSlot("Specpmin"); | |
742 | params.AddNamedSlot("npart"); | |
743 | params.AddNamedSlot("ncolpp"); | |
744 | params.AddNamedSlot("ncolnp"); | |
745 | params.AddNamedSlot("ncolpn"); | |
746 | params.AddNamedSlot("ncolnn"); | |
747 | ||
748 | params.SetSignal(specmode,"specmode"); | |
749 | params.SetSignal(fSpecpmin,"Specpmin"); | |
750 | params.SetSignal(npt,"npart"); | |
751 | params.SetSignal(ncols[0],"ncolpp"); | |
752 | params.SetSignal(ncols[1],"ncolnp"); | |
753 | params.SetSignal(ncols[2],"ncolpn"); | |
754 | params.SetSignal(ncols[3],"ncolnn"); | |
da17f667 | 755 | } |
756 | else | |
757 | { | |
758 | v[0]=GetP(1,1); | |
759 | v[1]=GetP(1,2); | |
760 | v[2]=GetP(1,3); | |
761 | pnucl=sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); | |
762 | kf=GetK(1,2); | |
763 | fEvent->SetProjectile(0,0,pnucl,kf); | |
764 | v[0]=GetP(2,1); | |
765 | v[1]=GetP(2,2); | |
766 | v[2]=GetP(2,3); | |
767 | pnucl=sqrt(v[0]*v[0]+v[1]*v[1]+v[2]*v[2]); | |
768 | kf=GetK(2,2); | |
769 | fEvent->SetTarget(0,0,pnucl,kf); | |
770 | } | |
25eefd00 | 771 | |
772 | fEvent->AddDevice(params); | |
773 | ||
da17f667 | 774 | first=0; |
775 | } | |
776 | ||
777 | if (medit >= 0) Pyedit(medit); // Define which particles are to be kept | |
fdbea0ce | 778 | |
f4d1f676 | 779 | if (mlist>=0 && select) |
780 | { | |
781 | Pylist(mlist); | |
782 | cout << endl; | |
783 | } | |
fdbea0ce | 784 | |
c72198f1 | 785 | npart=GetN(); |
786 | for (Int_t jpart=1; jpart<=npart; jpart++) | |
fdbea0ce | 787 | { |
c72198f1 | 788 | kf=GetK(jpart,2); |
789 | charge=Pychge(kf)/3.; | |
790 | mass=GetP(jpart,5); | |
6aff9852 | 791 | name=GetPyname(kf); |
fdbea0ce | 792 | |
793 | // 3-momentum in GeV/c | |
c72198f1 | 794 | v[0]=GetP(jpart,1); |
795 | v[1]=GetP(jpart,2); | |
796 | v[2]=GetP(jpart,3); | |
fdbea0ce | 797 | p.SetVector(v,"car"); |
798 | ||
25eefd00 | 799 | // Production location in meter. |
800 | v[0]=GetV(jpart,1)/1000.; | |
801 | v[1]=GetV(jpart,2)/1000.; | |
802 | v[2]=GetV(jpart,3)/1000.; | |
da17f667 | 803 | r.SetPosition(v,"car"); |
fdbea0ce | 804 | |
805 | ntk++; | |
806 | ||
807 | t.Reset(); | |
808 | t.SetId(ntk); | |
809 | t.SetParticleCode(kf); | |
6aff9852 | 810 | t.SetName(name.Data()); |
fdbea0ce | 811 | t.SetCharge(charge); |
812 | t.SetMass(mass); | |
813 | t.Set3Momentum(p); | |
814 | t.SetBeginPoint(r); | |
815 | ||
816 | fEvent->AddTrack(t); | |
817 | ||
818 | // Build the vertex structures if requested | |
819 | if (fVertexmode) | |
820 | { | |
821 | // Check if track belongs within the resolution to an existing vertex | |
822 | Int_t add=0; | |
823 | for (Int_t jv=1; jv<=fEvent->GetNvertices(); jv++) | |
824 | { | |
825 | AliVertex* vx=fEvent->GetVertex(jv); | |
826 | if (vx) | |
827 | { | |
828 | rx=vx->GetPosition(); | |
829 | dist=rx.GetDistance(r); | |
830 | if (dist < fResolution) | |
831 | { | |
832 | AliTrack* tx=fEvent->GetIdTrack(ntk); | |
833 | if (tx) | |
834 | { | |
835 | vx->AddTrack(tx); | |
836 | add=1; | |
837 | } | |
838 | } | |
839 | } | |
840 | if (add) break; // No need to look further for vertex candidates | |
841 | } | |
842 | ||
843 | // If track was not close enough to an existing vertex | |
844 | // a new secondary vertex is created | |
845 | if (!add && fVertexmode>1) | |
846 | { | |
847 | AliTrack* tx=fEvent->GetIdTrack(ntk); | |
848 | if (tx) | |
849 | { | |
da17f667 | 850 | v[0]=fResolution; |
851 | v[1]=fResolution; | |
852 | v[2]=fResolution; | |
853 | r.SetPositionErrors(v,"car"); | |
fdbea0ce | 854 | vert.Reset(); |
855 | vert.SetTrackCopy(0); | |
856 | vert.SetVertexCopy(0); | |
857 | vert.SetId((fEvent->GetNvertices())+1); | |
858 | vert.SetPosition(r); | |
859 | vert.AddTrack(tx); | |
860 | fEvent->AddVertex(vert,0); | |
861 | } | |
862 | } | |
863 | } | |
864 | } // End of loop over the produced particles for each collision | |
865 | } // End of loop over number of collisions for each type | |
866 | } // End of loop over collision types | |
867 | ||
868 | // Link sec. vertices to primary if requested | |
869 | // Note that also the connecting tracks are automatically created | |
870 | if (fVertexmode>2) | |
871 | { | |
872 | AliVertex* vp=fEvent->GetIdVertex(1); // Primary vertex | |
873 | if (vp) | |
874 | { | |
875 | for (Int_t i=2; i<=fEvent->GetNvertices(); i++) | |
876 | { | |
877 | AliVertex* vx=fEvent->GetVertex(i); | |
878 | if (vx) | |
879 | { | |
880 | if (vx->GetId() != 1) vp->AddVertex(vx); | |
881 | } | |
882 | } | |
883 | } | |
884 | } | |
885 | ||
47dddbe4 | 886 | // Include the spectator tracks in the event structure. |
887 | if (fNucl && specmode) | |
888 | { | |
47dddbe4 | 889 | v[0]=0; |
890 | v[1]=0; | |
891 | v[2]=0; | |
892 | r.SetPosition(v,"car"); | |
893 | ||
894 | zp=fZproj-(ncols[0]+ncols[2]); | |
895 | if (zp<0) zp=0; | |
896 | ap=fAproj-(ncols[0]+ncols[1]+ncols[2]+ncols[3]); | |
897 | if (ap<0) ap=0; | |
898 | zt=fZtarg-(ncols[0]+ncols[1]); | |
899 | if (zt<0) zt=0; | |
900 | at=fAtarg-(ncols[0]+ncols[1]+ncols[2]+ncols[3]); | |
901 | if (at<0) at=0; | |
902 | ||
903 | Int_t nspec=0; | |
904 | ||
905 | if (pproj.GetNorm() > fSpecpmin) | |
906 | { | |
907 | kf=2212; // Projectile spectator protons | |
908 | charge=Pychge(kf)/3.; | |
6aff9852 | 909 | mass=GetPMAS(Pycomp(kf),1); |
910 | name=GetPyname(kf); | |
47dddbe4 | 911 | for (Int_t iprojp=1; iprojp<=zp; iprojp++) |
912 | { | |
913 | nspec++; | |
914 | t.Reset(); | |
915 | t.SetId(-nspec); | |
916 | t.SetParticleCode(kf); | |
6aff9852 | 917 | t.SetName(name.Data()); |
47dddbe4 | 918 | t.SetTitle("Projectile spectator proton"); |
919 | t.SetCharge(charge); | |
920 | t.SetMass(mass); | |
921 | t.Set3Momentum(pproj); | |
922 | t.SetBeginPoint(r); | |
923 | ||
924 | fEvent->AddTrack(t); | |
925 | } | |
926 | ||
927 | kf=2112; // Projectile spectator neutrons | |
928 | charge=Pychge(kf)/3.; | |
6aff9852 | 929 | mass=GetPMAS(Pycomp(kf),1); |
930 | name=GetPyname(kf); | |
47dddbe4 | 931 | for (Int_t iprojn=1; iprojn<=(ap-zp); iprojn++) |
932 | { | |
933 | nspec++; | |
934 | t.Reset(); | |
935 | t.SetId(-nspec); | |
936 | t.SetParticleCode(kf); | |
6aff9852 | 937 | t.SetName(name.Data()); |
47dddbe4 | 938 | t.SetTitle("Projectile spectator neutron"); |
939 | t.SetCharge(charge); | |
940 | t.SetMass(mass); | |
941 | t.Set3Momentum(pproj); | |
942 | t.SetBeginPoint(r); | |
943 | ||
944 | fEvent->AddTrack(t); | |
945 | } | |
946 | } | |
947 | ||
948 | if (ptarg.GetNorm() > fSpecpmin) | |
949 | { | |
950 | kf=2212; // Target spectator protons | |
951 | charge=Pychge(kf)/3.; | |
6aff9852 | 952 | mass=GetPMAS(Pycomp(kf),1); |
953 | name=GetPyname(kf); | |
47dddbe4 | 954 | for (Int_t itargp=1; itargp<=zt; itargp++) |
955 | { | |
956 | nspec++; | |
957 | t.Reset(); | |
958 | t.SetId(-nspec); | |
959 | t.SetParticleCode(kf); | |
6aff9852 | 960 | t.SetName(name.Data()); |
47dddbe4 | 961 | t.SetTitle("Target spectator proton"); |
962 | t.SetCharge(charge); | |
963 | t.SetMass(mass); | |
964 | t.Set3Momentum(ptarg); | |
965 | t.SetBeginPoint(r); | |
966 | ||
967 | fEvent->AddTrack(t); | |
968 | } | |
969 | ||
970 | kf=2112; // Target spectator neutrons | |
971 | charge=Pychge(kf)/3.; | |
6aff9852 | 972 | mass=GetPMAS(Pycomp(kf),1); |
973 | name=GetPyname(kf); | |
47dddbe4 | 974 | for (Int_t itargn=1; itargn<=(at-zt); itargn++) |
975 | { | |
976 | nspec++; | |
977 | t.Reset(); | |
978 | t.SetId(-nspec); | |
979 | t.SetParticleCode(kf); | |
6aff9852 | 980 | t.SetName(name.Data()); |
47dddbe4 | 981 | t.SetTitle("Target spectator neutron"); |
982 | t.SetCharge(charge); | |
983 | t.SetMass(mass); | |
984 | t.Set3Momentum(ptarg); | |
985 | t.SetBeginPoint(r); | |
986 | ||
987 | fEvent->AddTrack(t); | |
988 | } | |
989 | } | |
990 | ||
991 | // Link the spectator tracks to the primary vertex. | |
992 | if (fVertexmode) | |
993 | { | |
994 | AliVertex* vp=fEvent->GetIdVertex(1); | |
995 | if (vp) | |
996 | { | |
997 | for (Int_t ispec=1; ispec<=nspec; ispec++) | |
998 | { | |
999 | AliTrack* tx=fEvent->GetIdTrack(-ispec); | |
1000 | if (tx) vp->AddTrack(tx); | |
1001 | } | |
1002 | } | |
1003 | } | |
1004 | } | |
1005 | ||
965bd237 | 1006 | if (!(fEventnum%fPrintfreq) && (mlist || fEvent)) |
1007 | { | |
1008 | if (fEvent) | |
1009 | { | |
1010 | cout << " Number of tracks in the event structure : " | |
1011 | << fEvent->GetNtracks() << endl; | |
1012 | } | |
1013 | cout << endl; // Create empty output line after the event | |
1014 | } | |
47dddbe4 | 1015 | |
1016 | if (fOutTree && fSelect) fOutTree->Fill(); | |
fdbea0ce | 1017 | } |
1018 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 1019 | AliEvent* AliCollider::GetEvent(Int_t select) const |
fdbea0ce | 1020 | { |
1021 | // Provide pointer to the generated event structure. | |
47dddbe4 | 1022 | // |
1023 | // select = 0 : Always return the pointer to the generated event. | |
1024 | // 1 : Only return the pointer to the generated event in case | |
1025 | // the event passed the selection criteria as specified via | |
1026 | // SelectEvent(). Otherwise the value 0 will be returned. | |
1027 | // | |
1028 | // By invoking GetEvent() the default of select=0 will be used. | |
1029 | ||
1030 | if (!select || fSelect) | |
1031 | { | |
1032 | return fEvent; | |
1033 | } | |
1034 | else | |
1035 | { | |
1036 | return 0; | |
1037 | } | |
fdbea0ce | 1038 | } |
1039 | /////////////////////////////////////////////////////////////////////////// | |
1040 | void AliCollider::EndRun() | |
1041 | { | |
1042 | // Properly close the output file (if needed). | |
1043 | if (fOutFile) | |
1044 | { | |
1045 | fOutFile->Write(); | |
1046 | fOutFile->Close(); | |
1047 | cout << " *AliCollider::EndRun* Output file correctly closed." << endl; | |
1048 | } | |
1049 | } | |
1050 | /////////////////////////////////////////////////////////////////////////// | |
5f25234b | 1051 | void AliCollider::SetStable(Int_t id,Int_t mode) |
1052 | { | |
1053 | // Declare whether a particle must be regarded as stable or not. | |
1054 | // The parameter "id" indicates the Pythia KF particle code, which | |
1055 | // basically is the PDG particle identifier code. | |
1056 | // The parameter "mode" indicates the action to be taken. | |
1057 | // | |
1058 | // mode = 0 : Particle will be able to decay | |
1059 | // 1 : Particle will be regarded as stable. | |
1060 | // | |
1061 | // In case the user does NOT explicitly invoke this function, the standard | |
1062 | // Pythia settings for the decay tables are used. | |
1063 | // | |
1064 | // When this function is invoked without the "mode" argument, then the | |
1065 | // default of mode=1 will be used for the specified particle. | |
1066 | // | |
1067 | // Notes : | |
1068 | // ------- | |
1069 | // 1) This function should be invoked after the initialisation call | |
1070 | // to AliCollider::Init. | |
1071 | // 2) Due to the internals of Pythia, there is no need to specify particles | |
1072 | // and their corresponding anti-particles separately as (un)stable. | |
1073 | // Once a particle has been declared (un)stable, the corresponding | |
1074 | // anti-particle will be treated in the same way. | |
1075 | ||
1076 | if (mode==0 || mode==1) | |
1077 | { | |
1078 | Int_t kc=Pycomp(id); | |
1079 | Int_t decay=1-mode; | |
1080 | if (kc>0) | |
1081 | { | |
1082 | SetMDCY(kc,1,decay); | |
1083 | } | |
1084 | else | |
1085 | { | |
1086 | cout << " *AliCollider::SetStable* Unknown particle code. id = " << id << endl; | |
1087 | } | |
1088 | } | |
1089 | else | |
1090 | { | |
1091 | cout << " *AliCollider::SetStable* Invalid parameter. mode = " << mode << endl; | |
1092 | } | |
1093 | } | |
1094 | /////////////////////////////////////////////////////////////////////////// | |
47dddbe4 | 1095 | void AliCollider::SelectEvent(Int_t id) |
1096 | { | |
1097 | // Add a particle to the event selection list. | |
1098 | // The parameter "id" indicates the Pythia KF particle code, which | |
1099 | // basically is the PDG particle identifier code. | |
1100 | // In case the user has built a selection list via this procedure, only the | |
1101 | // events in which one of the particles specified in the list was generated | |
1102 | // will be kept. | |
1103 | // The investigation of the generated particles takes place when the complete | |
1104 | // event is in memory, including all (shortlived) mother particles and resonances. | |
1105 | // So, the settings of the various particle decay modes have no influence on | |
1106 | // the event selection described here. | |
1107 | // | |
1108 | // If no list has been specified, all events will be accepted. | |
1109 | // | |
1110 | // Note : id=0 will delete the selection list. | |
1111 | // | |
1112 | // Be aware of the fact that severe selection criteria (i.e. selecting only | |
1113 | // rare events) may result in long runtimes before an event sample has been | |
1114 | // obtained. | |
1115 | // | |
1116 | if (!id) | |
1117 | { | |
1118 | if (fSelections) | |
1119 | { | |
1120 | delete fSelections; | |
1121 | fSelections=0; | |
1122 | } | |
1123 | } | |
1124 | else | |
1125 | { | |
1126 | Int_t kc=Pycomp(id); | |
1127 | if (!fSelections) | |
1128 | { | |
1129 | fSelections=new TArrayI(1); | |
1130 | fSelections->AddAt(kc,0); | |
1131 | } | |
1132 | else | |
1133 | { | |
1134 | Int_t exist=0; | |
1135 | Int_t size=fSelections->GetSize(); | |
1136 | for (Int_t i=0; i<size; i++) | |
1137 | { | |
1138 | if (kc==fSelections->At(i)) | |
1139 | { | |
1140 | exist=1; | |
1141 | break; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | if (!exist) | |
1146 | { | |
1147 | fSelections->Set(size+1); | |
1148 | fSelections->AddAt(kc,size); | |
1149 | } | |
1150 | } | |
1151 | } | |
1152 | } | |
1153 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 1154 | Int_t AliCollider::GetSelectionFlag() const |
47dddbe4 | 1155 | { |
1156 | // Return the value of the selection flag for the total event. | |
1157 | // When the event passed the selection criteria as specified via | |
1158 | // SelectEvent() the value 1 is returned, otherwise the value 0 is returned. | |
1159 | return fSelect; | |
1160 | } | |
1161 | /////////////////////////////////////////////////////////////////////////// | |
1162 | Int_t AliCollider::IsSelected() | |
1163 | { | |
1164 | // Check whether the generated (sub)event contains one of the particles | |
1165 | // specified in the selection list via SelectEvent(). | |
1166 | // If this is the case or when no selection list is present, the value 1 | |
1167 | // will be returned, indicating the event is selected to be kept. | |
1168 | // Otherwise the value 0 will be returned. | |
1169 | ||
1170 | if (!fSelections) return 1; | |
1171 | ||
1172 | Int_t nsel=fSelections->GetSize(); | |
1173 | Int_t npart=GetN(); | |
1174 | Int_t kf,kc; | |
1175 | ||
1176 | Int_t select=0; | |
1177 | for (Int_t jpart=1; jpart<=npart; jpart++) | |
1178 | { | |
1179 | kf=GetK(jpart,2); | |
1180 | kc=Pycomp(kf); | |
1181 | for (Int_t i=0; i<nsel; i++) | |
1182 | { | |
1183 | if (kc==fSelections->At(i)) | |
1184 | { | |
1185 | select=1; | |
1186 | break; | |
1187 | } | |
1188 | } | |
1189 | if (select) break; | |
1190 | } | |
1191 | return select; | |
1192 | } | |
1193 | /////////////////////////////////////////////////////////////////////////// | |
1194 | void AliCollider::SetSpectatorPmin(Float_t pmin) | |
1195 | { | |
1196 | // Set minimal momentum in GeV/c for spectator tracks to be stored. | |
1197 | // Spectator tracks with a momentum below this threshold will not be stored | |
1198 | // in the (output) event structure. | |
1199 | // This facility allows to minimise the output file size. | |
1200 | // Note that when the user wants to boost the event into another reference | |
1201 | // frame these spectator tracks might have got momenta above the threshold. | |
1202 | // However, when the spectator tracks were not stored in the event structure | |
1203 | // in the original frame, there is no way to retreive them anymore. | |
1204 | fSpecpmin=pmin; | |
1205 | } | |
1206 | /////////////////////////////////////////////////////////////////////////// | |
261c0caf | 1207 | Float_t AliCollider::GetSpectatorPmin() const |
47dddbe4 | 1208 | { |
1209 | // Provide the minimal spectator momentum in GeV/c. | |
1210 | return fSpecpmin; | |
1211 | } | |
1212 | /////////////////////////////////////////////////////////////////////////// | |
6aff9852 | 1213 | TString AliCollider::GetPyname(Int_t kf) |
1214 | { | |
1215 | // Provide the correctly truncated Pythia particle name for PGD code kf | |
1216 | // | |
1217 | // The TPythia6::Pyname returned name is copied into a TString and truncated | |
1218 | // at the first blank to prevent funny trailing characters due to incorrect | |
1219 | // stripping of empty characters in TPythia6::Pyname. | |
1220 | // The truncation at the first blank is allowed due to the Pythia convention | |
1221 | // that particle names never contain blanks. | |
1222 | char name[16]; | |
1223 | TString sname; | |
1224 | Pyname(kf,name); | |
1225 | sname=name[0]; | |
1226 | for (Int_t i=1; i<16; i++) | |
1227 | { | |
1228 | if (name[i]==' ') break; | |
1229 | sname=sname+name[i]; | |
1230 | } | |
1231 | return sname; | |
1232 | } | |
1233 | /////////////////////////////////////////////////////////////////////////// |