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1 | /************************************************************************** | |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* | |
17 | $Log$ | |
18 | Revision 1.17 2000/12/08 12:53:27 cblume | |
19 | Change in Copy() function for HP-compiler | |
20 | ||
21 | Revision 1.16 2000/12/07 12:20:46 cblume | |
22 | Go back to array compression. Use sampled PRF to speed up digitization | |
23 | ||
24 | Revision 1.15 2000/11/23 14:34:08 cblume | |
25 | Fixed bug in expansion routine of arrays (initialize buffers properly) | |
26 | ||
27 | Revision 1.14 2000/11/20 08:54:44 cblume | |
28 | Switch off compression as default | |
29 | ||
30 | Revision 1.13 2000/11/10 14:57:52 cblume | |
31 | Changes in the geometry constants for the DEC compiler | |
32 | ||
33 | Revision 1.12 2000/11/01 14:53:20 cblume | |
34 | Merge with TRD-develop | |
35 | ||
36 | Revision 1.1.4.9 2000/10/26 17:00:22 cblume | |
37 | Fixed bug in CheckDetector() | |
38 | ||
39 | Revision 1.1.4.8 2000/10/23 13:41:35 cblume | |
40 | Added protection against Log(0) in the gas gain calulation | |
41 | ||
42 | Revision 1.1.4.7 2000/10/17 02:27:34 cblume | |
43 | Get rid of global constants | |
44 | ||
45 | Revision 1.1.4.6 2000/10/16 01:16:53 cblume | |
46 | Changed timebin 0 to be the one closest to the readout | |
47 | ||
48 | Revision 1.1.4.5 2000/10/15 23:34:29 cblume | |
49 | Faster version of the digitizer | |
50 | ||
51 | Revision 1.1.4.4 2000/10/06 16:49:46 cblume | |
52 | Made Getters const | |
53 | ||
54 | Revision 1.1.4.3 2000/10/04 16:34:58 cblume | |
55 | Replace include files by forward declarations | |
56 | ||
57 | Revision 1.1.4.2 2000/09/22 14:41:10 cblume | |
58 | Bug fix in PRF. Included time response. New structure | |
59 | ||
60 | Revision 1.10 2000/10/05 07:27:53 cblume | |
61 | Changes in the header-files by FCA | |
62 | ||
63 | Revision 1.9 2000/10/02 21:28:19 fca | |
64 | Removal of useless dependecies via forward declarations | |
65 | ||
66 | Revision 1.8 2000/06/09 11:10:07 cblume | |
67 | Compiler warnings and coding conventions, next round | |
68 | ||
69 | Revision 1.7 2000/06/08 18:32:58 cblume | |
70 | Make code compliant to coding conventions | |
71 | ||
72 | Revision 1.6 2000/06/07 16:27:32 cblume | |
73 | Try to remove compiler warnings on Sun and HP | |
74 | ||
75 | Revision 1.5 2000/05/09 16:38:57 cblume | |
76 | Removed PadResponse(). Merge problem | |
77 | ||
78 | Revision 1.4 2000/05/08 15:53:45 cblume | |
79 | Resolved merge conflict | |
80 | ||
81 | Revision 1.3 2000/04/28 14:49:27 cblume | |
82 | Only one declaration of iDict in MakeDigits() | |
83 | ||
84 | Revision 1.1.4.1 2000/05/08 14:42:04 cblume | |
85 | Introduced AliTRDdigitsManager | |
86 | ||
87 | Revision 1.1 2000/02/28 19:00:13 cblume | |
88 | Add new TRD classes | |
89 | ||
90 | */ | |
91 | ||
92 | /////////////////////////////////////////////////////////////////////////////// | |
93 | // // | |
94 | // Creates and handles digits from TRD hits // | |
95 | // // | |
96 | // The following effects are included: // | |
97 | // - Diffusion // | |
98 | // - ExB effects // | |
99 | // - Gas gain including fluctuations // | |
100 | // - Pad-response (simple Gaussian approximation) // | |
101 | // - Electronics noise // | |
102 | // - Electronics gain // | |
103 | // - Digitization // | |
104 | // - ADC threshold // | |
105 | // The corresponding parameter can be adjusted via the various // | |
106 | // Set-functions. If these parameters are not explicitly set, default // | |
107 | // values are used (see Init-function). // | |
108 | // To produce digits from a root-file with TRD-hits use the // | |
109 | // slowDigitsCreate.C macro. // | |
110 | // // | |
111 | /////////////////////////////////////////////////////////////////////////////// | |
112 | ||
113 | #include <stdlib.h> | |
114 | ||
115 | #include <TMath.h> | |
116 | #include <TVector.h> | |
117 | #include <TRandom.h> | |
118 | #include <TROOT.h> | |
119 | #include <TTree.h> | |
120 | #include <TFile.h> | |
121 | #include <TF1.h> | |
122 | ||
123 | #include "AliRun.h" | |
124 | ||
125 | #include "AliTRD.h" | |
126 | #include "AliTRDhit.h" | |
127 | #include "AliTRDdigitizer.h" | |
128 | #include "AliTRDdataArrayI.h" | |
129 | #include "AliTRDdataArrayF.h" | |
130 | #include "AliTRDsegmentArray.h" | |
131 | #include "AliTRDdigitsManager.h" | |
132 | #include "AliTRDgeometry.h" | |
133 | ||
134 | ClassImp(AliTRDdigitizer) | |
135 | ||
136 | //_____________________________________________________________________________ | |
137 | AliTRDdigitizer::AliTRDdigitizer():TNamed() | |
138 | { | |
139 | // | |
140 | // AliTRDdigitizer default constructor | |
141 | // | |
142 | ||
143 | fInputFile = NULL; | |
144 | fDigits = NULL; | |
145 | fTRD = NULL; | |
146 | fGeo = NULL; | |
147 | fPRF = NULL; | |
148 | fPRFsmp = NULL; | |
149 | fTRF = NULL; | |
150 | fTRFint = NULL; | |
151 | ||
152 | fEvent = 0; | |
153 | fGasGain = 0.0; | |
154 | fNoise = 0.0; | |
155 | fChipGain = 0.0; | |
156 | fADCoutRange = 0.0; | |
157 | fADCinRange = 0.0; | |
158 | fADCthreshold = 0; | |
159 | fDiffusionOn = 0; | |
160 | fDiffusionT = 0.0; | |
161 | fDiffusionL = 0.0; | |
162 | fElAttachOn = 0; | |
163 | fElAttachProp = 0.0; | |
164 | fExBOn = 0; | |
165 | fOmegaTau = 0.0; | |
166 | fPRFOn = 0; | |
167 | fTRFOn = 0; | |
168 | fDriftVelocity = 0.0; | |
169 | ||
170 | fPRFbin = 0; | |
171 | fPRFlo = 0.0; | |
172 | fPRFhi = 0.0; | |
173 | fPRFwid = 0.0; | |
174 | fPRFpad = 0; | |
175 | fTRFbin = 0; | |
176 | fTRFlo = 0.0; | |
177 | fTRFhi = 0.0; | |
178 | fTRFwid = 0.0; | |
179 | ||
180 | fCompress = kTRUE; | |
181 | fVerbose = 1; | |
182 | ||
183 | } | |
184 | ||
185 | //_____________________________________________________________________________ | |
186 | AliTRDdigitizer::AliTRDdigitizer(const Text_t *name, const Text_t *title) | |
187 | :TNamed(name,title) | |
188 | { | |
189 | // | |
190 | // AliTRDdigitizer default constructor | |
191 | // | |
192 | ||
193 | fInputFile = NULL; | |
194 | fDigits = NULL; | |
195 | fTRD = NULL; | |
196 | fGeo = NULL; | |
197 | fPRF = NULL; | |
198 | fPRFsmp = NULL; | |
199 | fTRF = NULL; | |
200 | fTRFint = NULL; | |
201 | ||
202 | fEvent = 0; | |
203 | ||
204 | fCompress = kTRUE; | |
205 | fVerbose = 1; | |
206 | ||
207 | Init(); | |
208 | ||
209 | } | |
210 | ||
211 | //_____________________________________________________________________________ | |
212 | AliTRDdigitizer::AliTRDdigitizer(const AliTRDdigitizer &d) | |
213 | { | |
214 | // | |
215 | // AliTRDdigitizer copy constructor | |
216 | // | |
217 | ||
218 | ((AliTRDdigitizer &) d).Copy(*this); | |
219 | ||
220 | } | |
221 | ||
222 | //_____________________________________________________________________________ | |
223 | AliTRDdigitizer::~AliTRDdigitizer() | |
224 | { | |
225 | // | |
226 | // AliTRDdigitizer destructor | |
227 | // | |
228 | ||
229 | if (fInputFile) { | |
230 | fInputFile->Close(); | |
231 | delete fInputFile; | |
232 | } | |
233 | ||
234 | if (fDigits) { | |
235 | delete fDigits; | |
236 | } | |
237 | ||
238 | if (fPRF) delete fPRF; | |
239 | if (fTRF) delete fTRF; | |
240 | ||
241 | } | |
242 | ||
243 | //_____________________________________________________________________________ | |
244 | AliTRDdigitizer &AliTRDdigitizer::operator=(const AliTRDdigitizer &d) | |
245 | { | |
246 | // | |
247 | // Assignment operator | |
248 | // | |
249 | ||
250 | if (this != &d) ((AliTRDdigitizer &) d).Copy(*this); | |
251 | return *this; | |
252 | ||
253 | } | |
254 | ||
255 | //_____________________________________________________________________________ | |
256 | void AliTRDdigitizer::Copy(TObject &d) | |
257 | { | |
258 | // | |
259 | // Copy function | |
260 | // | |
261 | ||
262 | Int_t iBin; | |
263 | ||
264 | ((AliTRDdigitizer &) d).fInputFile = NULL; | |
265 | ((AliTRDdigitizer &) d).fDigits = NULL; | |
266 | ((AliTRDdigitizer &) d).fTRD = NULL; | |
267 | ((AliTRDdigitizer &) d).fGeo = NULL; | |
268 | ||
269 | ((AliTRDdigitizer &) d).fEvent = 0; | |
270 | ||
271 | ((AliTRDdigitizer &) d).fGasGain = fGasGain; | |
272 | ((AliTRDdigitizer &) d).fNoise = fNoise; | |
273 | ((AliTRDdigitizer &) d).fChipGain = fChipGain; | |
274 | ((AliTRDdigitizer &) d).fADCoutRange = fADCoutRange; | |
275 | ((AliTRDdigitizer &) d).fADCinRange = fADCinRange; | |
276 | ((AliTRDdigitizer &) d).fADCthreshold = fADCthreshold; | |
277 | ((AliTRDdigitizer &) d).fDiffusionOn = fDiffusionOn; | |
278 | ((AliTRDdigitizer &) d).fDiffusionT = fDiffusionT; | |
279 | ((AliTRDdigitizer &) d).fDiffusionL = fDiffusionL; | |
280 | ((AliTRDdigitizer &) d).fElAttachOn = fElAttachOn; | |
281 | ((AliTRDdigitizer &) d).fElAttachProp = fElAttachProp; | |
282 | ((AliTRDdigitizer &) d).fExBOn = fExBOn; | |
283 | ((AliTRDdigitizer &) d).fOmegaTau = fOmegaTau; | |
284 | ((AliTRDdigitizer &) d).fLorentzFactor = fLorentzFactor; | |
285 | ((AliTRDdigitizer &) d).fPRFOn = fPRFOn; | |
286 | ((AliTRDdigitizer &) d).fTRFOn = fTRFOn; | |
287 | ||
288 | ((AliTRDdigitizer &) d).fCompress = fCompress; | |
289 | ((AliTRDdigitizer &) d).fVerbose = fVerbose; | |
290 | ||
291 | fPRF->Copy(*((AliTRDdigitizer &) d).fPRF); | |
292 | fTRF->Copy(*((AliTRDdigitizer &) d).fTRF); | |
293 | ||
294 | ((AliTRDdigitizer &) d).fPRFbin = fPRFbin; | |
295 | ((AliTRDdigitizer &) d).fPRFlo = fPRFlo; | |
296 | ((AliTRDdigitizer &) d).fPRFhi = fPRFhi; | |
297 | ((AliTRDdigitizer &) d).fPRFwid = fPRFwid; | |
298 | ((AliTRDdigitizer &) d).fPRFpad = fPRFpad; | |
299 | if (((AliTRDdigitizer &) d).fPRFsmp) delete ((AliTRDdigitizer &) d).fPRFsmp; | |
300 | ((AliTRDdigitizer &) d).fPRFsmp = new Float_t[fPRFbin]; | |
301 | for (iBin = 0; iBin < fPRFbin; iBin++) { | |
302 | ((AliTRDdigitizer &) d).fPRFsmp[iBin] = fPRFsmp[iBin]; | |
303 | } | |
304 | ((AliTRDdigitizer &) d).fTRFbin = fTRFbin; | |
305 | ((AliTRDdigitizer &) d).fTRFlo = fTRFlo; | |
306 | ((AliTRDdigitizer &) d).fTRFhi = fTRFhi; | |
307 | ((AliTRDdigitizer &) d).fTRFwid = fTRFwid; | |
308 | if (((AliTRDdigitizer &) d).fTRFint) delete ((AliTRDdigitizer &) d).fTRFint; | |
309 | ((AliTRDdigitizer &) d).fTRFint = new Float_t[fTRFbin]; | |
310 | for (iBin = 0; iBin < fTRFbin; iBin++) { | |
311 | ((AliTRDdigitizer &) d).fTRFint[iBin] = fTRFint[iBin]; | |
312 | } | |
313 | ||
314 | } | |
315 | ||
316 | //_____________________________________________________________________________ | |
317 | Int_t AliTRDdigitizer::Diffusion(Float_t driftlength, Float_t *xyz) | |
318 | { | |
319 | // | |
320 | // Applies the diffusion smearing to the position of a single electron | |
321 | // | |
322 | ||
323 | Float_t driftSqrt = TMath::Sqrt(driftlength); | |
324 | Float_t sigmaT = driftSqrt * fDiffusionT; | |
325 | Float_t sigmaL = driftSqrt * fDiffusionL; | |
326 | xyz[0] = gRandom->Gaus(xyz[0], sigmaL * fLorentzFactor); | |
327 | xyz[1] = gRandom->Gaus(xyz[1], sigmaT * fLorentzFactor); | |
328 | xyz[2] = gRandom->Gaus(xyz[2], sigmaT); | |
329 | ||
330 | return 1; | |
331 | ||
332 | } | |
333 | ||
334 | //_____________________________________________________________________________ | |
335 | Int_t AliTRDdigitizer::ExB(Float_t driftlength, Float_t *xyz) | |
336 | { | |
337 | // | |
338 | // Applies E x B effects to the position of a single electron | |
339 | // | |
340 | ||
341 | xyz[0] = xyz[0]; | |
342 | xyz[1] = xyz[1] + fOmegaTau * driftlength; | |
343 | xyz[2] = xyz[2]; | |
344 | ||
345 | return 1; | |
346 | ||
347 | } | |
348 | ||
349 | //_____________________________________________________________________________ | |
350 | Int_t AliTRDdigitizer::PadResponse(Float_t signal, Float_t dist, Float_t *pad) | |
351 | { | |
352 | // | |
353 | // Applies the pad response | |
354 | // | |
355 | ||
356 | Int_t iBin = ((Int_t) (( - dist - fPRFlo) / fPRFwid)); | |
357 | ||
358 | Int_t iBin0 = iBin - fPRFpad; | |
359 | Int_t iBin1 = iBin; | |
360 | Int_t iBin2 = iBin + fPRFpad; | |
361 | ||
362 | if ((iBin0 >= 0) && (iBin2 < fPRFbin)) { | |
363 | ||
364 | pad[0] = signal * fPRFsmp[iBin0]; | |
365 | pad[1] = signal * fPRFsmp[iBin1]; | |
366 | pad[2] = signal * fPRFsmp[iBin2]; | |
367 | ||
368 | return 1; | |
369 | ||
370 | } | |
371 | else { | |
372 | ||
373 | return 0; | |
374 | ||
375 | } | |
376 | ||
377 | } | |
378 | ||
379 | //_____________________________________________________________________________ | |
380 | Float_t AliTRDdigitizer::TimeResponse(Float_t time) | |
381 | { | |
382 | // | |
383 | // Applies the preamp shaper time response | |
384 | // | |
385 | ||
386 | Int_t iBin = ((Int_t) ((time - fTRFlo) / fTRFwid)); | |
387 | if ((iBin >= 0) && (iBin < fTRFbin)) { | |
388 | return fTRFint[iBin]; | |
389 | } | |
390 | else { | |
391 | return 0.0; | |
392 | } | |
393 | ||
394 | } | |
395 | ||
396 | //_____________________________________________________________________________ | |
397 | void AliTRDdigitizer::Init() | |
398 | { | |
399 | // | |
400 | // Initializes the digitization procedure with standard values | |
401 | // | |
402 | ||
403 | // The default parameter for the digitization | |
404 | fGasGain = 8.0E3; | |
405 | fNoise = 3000.; | |
406 | fChipGain = 10.; | |
407 | fADCoutRange = 255.; | |
408 | fADCinRange = 2000.; | |
409 | fADCthreshold = 1; | |
410 | ||
411 | // Transverse and longitudinal diffusion coefficients (Xe/Isobutane) | |
412 | fDiffusionOn = 1; | |
413 | fDiffusionT = 0.060; | |
414 | fDiffusionL = 0.017; | |
415 | ||
416 | // Propability for electron attachment | |
417 | fElAttachOn = 0; | |
418 | fElAttachProp = 0.0; | |
419 | ||
420 | // E x B effects | |
421 | fExBOn = 0; | |
422 | // omega * tau. (tau ~ 12 * 10^-12, B = 0.2T) | |
423 | fOmegaTau = 17.6 * 12.0 * 0.2 * 0.01; | |
424 | ||
425 | // The pad response function | |
426 | fPRFOn = 1; | |
427 | fPRFlo = -3.0; | |
428 | fPRFhi = 3.0; | |
429 | fPRFbin = 1200; | |
430 | fPRFwid = (fPRFhi - fPRFlo) / ((Float_t) fPRFbin); | |
431 | fPRFpad = ((Int_t) (1.0 / fPRFwid)); | |
432 | fPRF = new TF1("PRF","[0]*([1]+exp(-x*x/(2.0*[2])))",fPRFlo,fPRFhi); | |
433 | fPRF->SetParameter(0, 0.8872); | |
434 | fPRF->SetParameter(1,-0.00573); | |
435 | fPRF->SetParameter(2, 0.454 * 0.454); | |
436 | ||
437 | // The drift velocity (cm / mus) | |
438 | fDriftVelocity = 1.0; | |
439 | ||
440 | // The time response function | |
441 | fTRFOn = 1; | |
442 | Float_t loTRF = -200.0; | |
443 | Float_t hiTRF = 1000.0; | |
444 | fTRF = new TF1("TRF",TRFlandau,loTRF,hiTRF,3); | |
445 | fTRF->SetParameter(0, 1.0 / 24.24249); | |
446 | fTRF->SetParameter(1, 0.0); | |
447 | fTRF->SetParameter(2, 25.0); | |
448 | fTRFbin = 1200; | |
449 | fTRFlo = loTRF * fDriftVelocity / 1000.0; | |
450 | fTRFhi = hiTRF * fDriftVelocity / 1000.0; | |
451 | fTRFwid = (fTRFhi - fTRFlo) / ((Float_t) fTRFbin); | |
452 | ||
453 | } | |
454 | ||
455 | //_____________________________________________________________________________ | |
456 | void AliTRDdigitizer::IntegrateTRF() | |
457 | { | |
458 | // | |
459 | // Integrates the time response function over the time bin size | |
460 | // | |
461 | ||
462 | if (fTRFint) delete fTRFint; | |
463 | fTRFint = new Float_t[fTRFbin]; | |
464 | Float_t hiTRF = fTRFhi / fDriftVelocity * 1000.0; | |
465 | Float_t loTRF = fTRFlo / fDriftVelocity * 1000.0; | |
466 | Float_t timeBin = fGeo->GetTimeBinSize() / fDriftVelocity * 1000.0; | |
467 | Float_t binWidth = (hiTRF - loTRF) / ((Float_t) fTRFbin); | |
468 | for (Int_t iBin = 0; iBin < fTRFbin; iBin++) { | |
469 | Float_t bin = iBin * binWidth + loTRF - 0.5 * timeBin; | |
470 | fTRFint[iBin] = fTRF->Integral(bin,bin + timeBin); | |
471 | } | |
472 | ||
473 | } | |
474 | ||
475 | //_____________________________________________________________________________ | |
476 | void AliTRDdigitizer::SamplePRF() | |
477 | { | |
478 | // | |
479 | // Samples the pad response function | |
480 | // | |
481 | ||
482 | if (fPRFsmp) delete fPRFsmp; | |
483 | fPRFsmp = new Float_t[fPRFbin]; | |
484 | for (Int_t iBin = 0; iBin < fPRFbin; iBin++) { | |
485 | Float_t bin = (((Float_t ) iBin) + 0.5) * fPRFwid + fPRFlo; | |
486 | fPRFsmp[iBin] = TMath::Max(fPRF->Eval(bin),0.0); | |
487 | } | |
488 | ||
489 | } | |
490 | ||
491 | //_____________________________________________________________________________ | |
492 | Bool_t AliTRDdigitizer::Open(const Char_t *name, Int_t nEvent) | |
493 | { | |
494 | // | |
495 | // Opens a ROOT-file with TRD-hits and reads in the hit-tree | |
496 | // | |
497 | ||
498 | // Connect the AliRoot file containing Geometry, Kine, and Hits | |
499 | fInputFile = (TFile*) gROOT->GetListOfFiles()->FindObject(name); | |
500 | if (!fInputFile) { | |
501 | printf("AliTRDdigitizer::Open -- "); | |
502 | printf("Open the ALIROOT-file %s.\n",name); | |
503 | fInputFile = new TFile(name,"UPDATE"); | |
504 | } | |
505 | else { | |
506 | printf("AliTRDdigitizer::Open -- "); | |
507 | printf("%s is already open.\n",name); | |
508 | } | |
509 | ||
510 | gAlice = (AliRun*) fInputFile->Get("gAlice"); | |
511 | if (gAlice) { | |
512 | printf("AliTRDdigitizer::Open -- "); | |
513 | printf("AliRun object found on file.\n"); | |
514 | } | |
515 | else { | |
516 | printf("AliTRDdigitizer::Open -- "); | |
517 | printf("Could not find AliRun object.\n"); | |
518 | return kFALSE; | |
519 | } | |
520 | ||
521 | fEvent = nEvent; | |
522 | ||
523 | // Import the Trees for the event nEvent in the file | |
524 | Int_t nparticles = gAlice->GetEvent(fEvent); | |
525 | if (nparticles <= 0) { | |
526 | printf("AliTRDdigitizer::Open -- "); | |
527 | printf("No entries in the trees for event %d.\n",fEvent); | |
528 | return kFALSE; | |
529 | } | |
530 | ||
531 | return InitDetector(); | |
532 | ||
533 | } | |
534 | ||
535 | //_____________________________________________________________________________ | |
536 | Bool_t AliTRDdigitizer::InitDetector() | |
537 | { | |
538 | // | |
539 | // Sets the pointer to the TRD detector and the geometry | |
540 | // | |
541 | ||
542 | // Get the pointer to the detector class and check for version 1 | |
543 | fTRD = (AliTRD*) gAlice->GetDetector("TRD"); | |
544 | if (fTRD->IsVersion() != 1) { | |
545 | printf("AliTRDdigitizer::Open -- "); | |
546 | printf("TRD must be version 1 (slow simulator).\n"); | |
547 | exit(1); | |
548 | } | |
549 | ||
550 | // Get the geometry | |
551 | fGeo = fTRD->GetGeometry(); | |
552 | printf("AliTRDdigitizer::Open -- "); | |
553 | printf("Geometry version %d\n",fGeo->IsVersion()); | |
554 | ||
555 | return kTRUE; | |
556 | ||
557 | } | |
558 | ||
559 | //_____________________________________________________________________________ | |
560 | Bool_t AliTRDdigitizer::MakeDigits() | |
561 | { | |
562 | // | |
563 | // Loops through the TRD-hits and creates the digits. | |
564 | // | |
565 | ||
566 | /////////////////////////////////////////////////////////////// | |
567 | // Parameter | |
568 | /////////////////////////////////////////////////////////////// | |
569 | ||
570 | // Converts number of electrons to fC | |
571 | const Float_t kEl2fC = 1.602E-19 * 1.0E15; | |
572 | ||
573 | /////////////////////////////////////////////////////////////// | |
574 | ||
575 | // Number of pads included in the pad response | |
576 | const Int_t kNpad = 3; | |
577 | ||
578 | // Number of track dictionary arrays | |
579 | const Int_t kNDict = AliTRDdigitsManager::kNDict; | |
580 | ||
581 | Int_t iRow, iCol, iTime; | |
582 | Int_t iDict; | |
583 | Int_t nBytes = 0; | |
584 | ||
585 | Int_t totalSizeDigits = 0; | |
586 | Int_t totalSizeDict0 = 0; | |
587 | Int_t totalSizeDict1 = 0; | |
588 | Int_t totalSizeDict2 = 0; | |
589 | ||
590 | AliTRDdataArrayF *signals = 0; | |
591 | AliTRDdataArrayI *digits = 0; | |
592 | AliTRDdataArrayI *dictionary[kNDict]; | |
593 | ||
594 | // Create a digits manager | |
595 | fDigits = new AliTRDdigitsManager(); | |
596 | ||
597 | // Create a container for the amplitudes | |
598 | AliTRDsegmentArray *signalsArray | |
599 | = new AliTRDsegmentArray("AliTRDdataArrayF",AliTRDgeometry::Ndet()); | |
600 | ||
601 | if (!fGeo) { | |
602 | printf("AliTRDdigitizer::MakeDigits -- "); | |
603 | printf("No geometry defined\n"); | |
604 | return kFALSE; | |
605 | } | |
606 | ||
607 | printf("AliTRDdigitizer::MakeDigits -- "); | |
608 | printf("Start creating digits.\n"); | |
609 | if (fVerbose > 0) this->Dump(); | |
610 | ||
611 | // The Lorentz factor | |
612 | if (fExBOn) { | |
613 | fLorentzFactor = 1.0 / (1.0 + fOmegaTau*fOmegaTau); | |
614 | } | |
615 | else { | |
616 | fLorentzFactor = 1.0; | |
617 | } | |
618 | ||
619 | // Create the sampled PRF | |
620 | SamplePRF(); | |
621 | ||
622 | // Create the integrated TRF | |
623 | IntegrateTRF(); | |
624 | ||
625 | // Get the pointer to the hit tree | |
626 | TTree *HitTree = gAlice->TreeH(); | |
627 | ||
628 | // Get the number of entries in the hit tree | |
629 | // (Number of primary particles creating a hit somewhere) | |
630 | Int_t nTrack = (Int_t) HitTree->GetEntries(); | |
631 | if (fVerbose > 0) { | |
632 | printf("AliTRDdigitizer::MakeDigits -- "); | |
633 | printf("Found %d primary particles\n",nTrack); | |
634 | } | |
635 | ||
636 | Int_t detectorOld = -1; | |
637 | Int_t countHits = 0; | |
638 | ||
639 | // Loop through all entries in the tree | |
640 | for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) { | |
641 | ||
642 | gAlice->ResetHits(); | |
643 | nBytes += HitTree->GetEvent(iTrack); | |
644 | ||
645 | // Get the number of hits in the TRD created by this particle | |
646 | Int_t nHit = fTRD->Hits()->GetEntriesFast(); | |
647 | if (fVerbose > 0) { | |
648 | printf("AliTRDdigitizer::MakeDigits -- "); | |
649 | printf("Found %d hits for primary particle %d\n",nHit,iTrack); | |
650 | } | |
651 | ||
652 | // Loop through the TRD hits | |
653 | for (Int_t iHit = 0; iHit < nHit; iHit++) { | |
654 | ||
655 | countHits++; | |
656 | ||
657 | AliTRDhit *hit = (AliTRDhit *) fTRD->Hits()->UncheckedAt(iHit); | |
658 | Float_t pos[3]; | |
659 | pos[0] = hit->X(); | |
660 | pos[1] = hit->Y(); | |
661 | pos[2] = hit->Z(); | |
662 | Float_t q = hit->GetCharge(); | |
663 | Int_t track = hit->Track(); | |
664 | Int_t detector = hit->GetDetector(); | |
665 | Int_t plane = fGeo->GetPlane(detector); | |
666 | Int_t sector = fGeo->GetSector(detector); | |
667 | Int_t chamber = fGeo->GetChamber(detector); | |
668 | ||
669 | if (!(CheckDetector(plane,chamber,sector))) continue; | |
670 | ||
671 | Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector); | |
672 | Int_t nColMax = fGeo->GetColMax(plane); | |
673 | Int_t nTimeMax = fGeo->GetTimeMax(); | |
674 | Float_t row0 = fGeo->GetRow0(plane,chamber,sector); | |
675 | Float_t col0 = fGeo->GetCol0(plane); | |
676 | Float_t time0 = fGeo->GetTime0(plane); | |
677 | Float_t rowPadSize = fGeo->GetRowPadSize(); | |
678 | Float_t colPadSize = fGeo->GetColPadSize(); | |
679 | Float_t timeBinSize = fGeo->GetTimeBinSize(); | |
680 | ||
681 | if (fVerbose > 1) { | |
682 | printf("Analyze hit no. %d ",iHit); | |
683 | printf("-----------------------------------------------------------\n"); | |
684 | hit->Dump(); | |
685 | printf("plane = %d, sector = %d, chamber = %d\n" | |
686 | ,plane,sector,chamber); | |
687 | printf("nRowMax = %d, nColMax = %d, nTimeMax = %d\n" | |
688 | ,nRowMax,nColMax,nTimeMax); | |
689 | printf("row0 = %f, col0 = %f, time0 = %f\n" | |
690 | ,row0,col0,time0); | |
691 | printf("rowPadSize = %f, colPadSize = %f, timeBinSize = %f\n" | |
692 | ,rowPadSize,colPadSize,timeBinSize); | |
693 | } | |
694 | ||
695 | // Don't analyze test hits with amplitude 0. | |
696 | if (((Int_t) q) == 0) continue; | |
697 | ||
698 | if (detector != detectorOld) { | |
699 | ||
700 | if (fVerbose > 1) { | |
701 | printf("AliTRDdigitizer::MakeDigits -- "); | |
702 | printf("Get new container. New det = %d, Old det = %d\n" | |
703 | ,detector,detectorOld); | |
704 | } | |
705 | // Compress the old one if enabled | |
706 | if ((fCompress) && (detectorOld > -1)) { | |
707 | if (fVerbose > 1) { | |
708 | printf("AliTRDdigitizer::MakeDigits -- "); | |
709 | printf("Compress the old container ..."); | |
710 | } | |
711 | signals->Compress(1,0); | |
712 | for (iDict = 0; iDict < kNDict; iDict++) { | |
713 | dictionary[iDict]->Compress(1,0); | |
714 | } | |
715 | if (fVerbose > 1) printf("done\n"); | |
716 | } | |
717 | // Get the new container | |
718 | signals = (AliTRDdataArrayF *) signalsArray->At(detector); | |
719 | if (signals->GetNtime() == 0) { | |
720 | // Allocate a new one if not yet existing | |
721 | if (fVerbose > 1) { | |
722 | printf("AliTRDdigitizer::MakeDigits -- "); | |
723 | printf("Allocate a new container ... "); | |
724 | } | |
725 | signals->Allocate(nRowMax,nColMax,nTimeMax); | |
726 | } | |
727 | else { | |
728 | // Expand an existing one | |
729 | if (fCompress) { | |
730 | if (fVerbose > 1) { | |
731 | printf("AliTRDdigitizer::MakeDigits -- "); | |
732 | printf("Expand an existing container ... "); | |
733 | } | |
734 | signals->Expand(); | |
735 | } | |
736 | } | |
737 | // The same for the dictionary | |
738 | for (iDict = 0; iDict < kNDict; iDict++) { | |
739 | dictionary[iDict] = fDigits->GetDictionary(detector,iDict); | |
740 | if (dictionary[iDict]->GetNtime() == 0) { | |
741 | dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeMax); | |
742 | } | |
743 | else { | |
744 | if (fCompress) dictionary[iDict]->Expand(); | |
745 | } | |
746 | } | |
747 | if (fVerbose > 1) printf("done\n"); | |
748 | detectorOld = detector; | |
749 | } | |
750 | ||
751 | // Rotate the sectors on top of each other | |
752 | Float_t rot[3]; | |
753 | fGeo->Rotate(detector,pos,rot); | |
754 | ||
755 | // The driftlength | |
756 | Float_t driftlength = time0 - rot[0]; | |
757 | if ((driftlength < 0) || | |
758 | (driftlength > AliTRDgeometry::DrThick())) continue; | |
759 | Float_t driftlengthL = driftlength; | |
760 | if (fExBOn) driftlengthL /= TMath::Sqrt(fLorentzFactor); | |
761 | ||
762 | // The hit position in pad coordinates (center pad) | |
763 | // The pad row (z-direction) | |
764 | Int_t rowH = (Int_t) ((rot[2] - row0) / rowPadSize); | |
765 | // The pad column (rphi-direction) | |
766 | Int_t colH = (Int_t) ((rot[1] - col0) / colPadSize); | |
767 | // The time bucket | |
768 | Int_t timeH = (Int_t) (driftlength / timeBinSize); | |
769 | if (fVerbose > 1) { | |
770 | printf("rowH = %d, colH = %d, timeH = %d\n" | |
771 | ,rowH,colH,timeH); | |
772 | } | |
773 | ||
774 | // Loop over all electrons of this hit | |
775 | // TR photons produce hits with negative charge | |
776 | Int_t nEl = ((Int_t) TMath::Abs(q)); | |
777 | for (Int_t iEl = 0; iEl < nEl; iEl++) { | |
778 | ||
779 | Float_t xyz[3]; | |
780 | xyz[0] = rot[0]; | |
781 | xyz[1] = rot[1]; | |
782 | xyz[2] = rot[2]; | |
783 | ||
784 | // Electron attachment | |
785 | if (fElAttachOn) { | |
786 | if (gRandom->Rndm() < (driftlengthL * fElAttachProp / 100.)) | |
787 | continue; | |
788 | } | |
789 | ||
790 | // Apply the diffusion smearing | |
791 | if (fDiffusionOn) { | |
792 | if (!(Diffusion(driftlengthL,xyz))) continue; | |
793 | } | |
794 | ||
795 | // Apply E x B effects | |
796 | if (fExBOn) { | |
797 | if (!(ExB(driftlength,xyz))) continue; | |
798 | } | |
799 | ||
800 | // The electron position | |
801 | // The pad row (z-direction) | |
802 | Int_t rowE = (Int_t) ((xyz[2] - row0) / rowPadSize); | |
803 | // The pad column (rphi-direction) | |
804 | Int_t colE = (Int_t) ((xyz[1] - col0) / colPadSize); | |
805 | // The time bucket | |
806 | Int_t timeE = (Int_t) ((time0 - xyz[0]) / timeBinSize); | |
807 | ||
808 | if (( rowE < 0) || ( rowE >= nRowMax)) continue; | |
809 | if (( colE < 0) || ( colE >= nColMax)) continue; | |
810 | if ((timeE < 0) || (timeE >= nTimeMax)) continue; | |
811 | ||
812 | // Apply the gas gain including fluctuations | |
813 | Float_t ggRndm = 0.0; | |
814 | do { | |
815 | ggRndm = gRandom->Rndm(); | |
816 | } while (ggRndm <= 0); | |
817 | Int_t signal = (Int_t) (-fGasGain * TMath::Log(ggRndm)); | |
818 | ||
819 | if (fVerbose > 2) { | |
820 | printf(" electron no. %d, signal = %d\n",iEl,signal); | |
821 | printf(" rowE = %d, colE = %d, timeE = %d\n" | |
822 | ,rowE,colE,timeE); | |
823 | } | |
824 | ||
825 | // Apply the pad response | |
826 | Float_t padSignal[kNpad]; | |
827 | if (fPRFOn) { | |
828 | // The distance of the electron to the center of the pad | |
829 | // in units of pad width | |
830 | Float_t dist = (xyz[1] - col0 - (colE + 0.5) * colPadSize) | |
831 | / colPadSize; | |
832 | if (!(PadResponse(signal,dist,padSignal))) continue; | |
833 | } | |
834 | else { | |
835 | padSignal[0] = 0.0; | |
836 | padSignal[1] = signal; | |
837 | padSignal[2] = 0.0; | |
838 | } | |
839 | ||
840 | // The distance of the position to the beginning of the timebin | |
841 | Float_t timeOffset = (time0 - timeE * timeBinSize) - xyz[0]; | |
842 | Int_t timeTRDbeg = 0; | |
843 | Int_t timeTRDend = 1; | |
844 | if (fTRFOn) { | |
845 | timeTRDbeg = 2; | |
846 | timeTRDend = 11; | |
847 | } | |
848 | for (Int_t iTimeBin = TMath::Max(timeE - timeTRDbeg, 0) | |
849 | ; iTimeBin < TMath::Min(timeE + timeTRDend,nTimeMax) | |
850 | ; iTimeBin++) { | |
851 | ||
852 | // Apply the time response | |
853 | Float_t timeResponse = 1.0; | |
854 | if (fTRFOn) { | |
855 | Float_t time = (iTimeBin - timeE) * timeBinSize + timeOffset; | |
856 | timeResponse = TimeResponse(time); | |
857 | } | |
858 | ||
859 | // Add the signals | |
860 | Float_t signalOld[kNpad] = { 0.0, 0.0, 0.0 }; | |
861 | for (Int_t iPad = 0; iPad < kNpad; iPad++) { | |
862 | Int_t colPos = colE + iPad - 1; | |
863 | if (colPos < 0) continue; | |
864 | if (colPos >= nColMax) break; | |
865 | signalOld[iPad] = signals->GetData(rowE,colPos,iTimeBin); | |
866 | signalOld[iPad] += padSignal[iPad] * timeResponse; | |
867 | signals->SetData(rowE,colPos,iTimeBin,signalOld[iPad]); | |
868 | } | |
869 | if (fVerbose > 3) { | |
870 | printf(" iTimeBin = %d, timeResponse = %f\n" | |
871 | ,iTimeBin,timeResponse); | |
872 | printf(" pad-signal = %f, %f, %f\n" | |
873 | ,signalOld[0],signalOld[1],signalOld[2]); | |
874 | } | |
875 | ||
876 | // Store the track index in the dictionary | |
877 | // Note: We store index+1 in order to allow the array to be compressed | |
878 | for (iDict = 0; iDict < kNDict; iDict++) { | |
879 | Int_t oldTrack = dictionary[iDict]->GetData(rowE,colE,timeE); | |
880 | if (oldTrack == track+1) break; | |
881 | //if (oldTrack == -1) break; | |
882 | if (oldTrack == 0) { | |
883 | dictionary[iDict]->SetData(rowE,colE,timeE,track+1); | |
884 | if (fVerbose > 3) { | |
885 | printf(" track index = %d\n",track); | |
886 | } | |
887 | break; | |
888 | } | |
889 | } | |
890 | if ((fVerbose > 1) && (iDict == kNDict)) { | |
891 | printf("AliTRDdigitizer::MakeDigits -- "); | |
892 | printf("More than three tracks for one digit!\n"); | |
893 | } | |
894 | ||
895 | } | |
896 | ||
897 | } | |
898 | ||
899 | } | |
900 | ||
901 | } // All hits finished | |
902 | ||
903 | printf("AliTRDdigitizer::MakeDigits -- "); | |
904 | printf("Finished analyzing %d hits\n",countHits); | |
905 | ||
906 | // Loop through all chambers to finalize the digits | |
907 | for (Int_t iDet = 0; iDet < AliTRDgeometry::Ndet(); iDet++) { | |
908 | ||
909 | Int_t plane = fGeo->GetPlane(iDet); | |
910 | Int_t sector = fGeo->GetSector(iDet); | |
911 | Int_t chamber = fGeo->GetChamber(iDet); | |
912 | Int_t nRowMax = fGeo->GetRowMax(plane,chamber,sector); | |
913 | Int_t nColMax = fGeo->GetColMax(plane); | |
914 | Int_t nTimeMax = fGeo->GetTimeMax(); | |
915 | ||
916 | //if (!(CheckDetector(plane,chamber,sector))) continue; | |
917 | if (fVerbose > 0) { | |
918 | printf("AliTRDdigitizer::MakeDigits -- "); | |
919 | printf("Digitization for chamber %d\n",iDet); | |
920 | } | |
921 | ||
922 | // Add a container for the digits of this detector | |
923 | digits = fDigits->GetDigits(iDet); | |
924 | // Allocate memory space for the digits buffer | |
925 | digits->Allocate(nRowMax,nColMax,nTimeMax); | |
926 | ||
927 | // Get the signal container | |
928 | signals = (AliTRDdataArrayF *) signalsArray->At(iDet); | |
929 | if (signals->GetNtime() == 0) { | |
930 | // Create missing containers | |
931 | signals->Allocate(nRowMax,nColMax,nTimeMax); | |
932 | } | |
933 | else { | |
934 | // Expand the container if neccessary | |
935 | if (fCompress) signals->Expand(); | |
936 | } | |
937 | // Create the missing dictionary containers | |
938 | for (iDict = 0; iDict < kNDict; iDict++) { | |
939 | dictionary[iDict] = fDigits->GetDictionary(iDet,iDict); | |
940 | if (dictionary[iDict]->GetNtime() == 0) { | |
941 | dictionary[iDict]->Allocate(nRowMax,nColMax,nTimeMax); | |
942 | } | |
943 | } | |
944 | ||
945 | Int_t nDigits = 0; | |
946 | ||
947 | // Create the digits for this chamber | |
948 | for (iRow = 0; iRow < nRowMax; iRow++ ) { | |
949 | for (iCol = 0; iCol < nColMax; iCol++ ) { | |
950 | for (iTime = 0; iTime < nTimeMax; iTime++) { | |
951 | ||
952 | Float_t signalAmp = signals->GetData(iRow,iCol,iTime); | |
953 | ||
954 | // Add the noise | |
955 | signalAmp = TMath::Max((Double_t) gRandom->Gaus(signalAmp,fNoise),0.0); | |
956 | // Convert to fC | |
957 | signalAmp *= kEl2fC; | |
958 | // Convert to mV | |
959 | signalAmp *= fChipGain; | |
960 | // Convert to ADC counts. Set the overflow-bit fADCoutRange if the | |
961 | // signal is larger than fADCinRange | |
962 | Int_t adc = 0; | |
963 | if (signalAmp >= fADCinRange) { | |
964 | adc = ((Int_t) fADCoutRange); | |
965 | } | |
966 | else { | |
967 | adc = ((Int_t) (signalAmp * (fADCoutRange / fADCinRange))); | |
968 | } | |
969 | ||
970 | // Store the amplitude of the digit if above threshold | |
971 | if (adc > fADCthreshold) { | |
972 | if (fVerbose > 2) { | |
973 | printf(" iRow = %d, iCol = %d, iTime = %d\n" | |
974 | ,iRow,iCol,iTime); | |
975 | printf(" signal = %f, adc = %d\n",signalAmp,adc); | |
976 | } | |
977 | nDigits++; | |
978 | digits->SetData(iRow,iCol,iTime,adc); | |
979 | } | |
980 | ||
981 | } | |
982 | } | |
983 | } | |
984 | ||
985 | // Compress the arrays | |
986 | digits->Compress(1,0); | |
987 | for (iDict = 0; iDict < kNDict; iDict++) { | |
988 | dictionary[iDict]->Compress(1,0); | |
989 | } | |
990 | ||
991 | totalSizeDigits += digits->GetSize(); | |
992 | totalSizeDict0 += dictionary[0]->GetSize(); | |
993 | totalSizeDict1 += dictionary[1]->GetSize(); | |
994 | totalSizeDict2 += dictionary[2]->GetSize(); | |
995 | ||
996 | Float_t nPixel = nRowMax * nColMax * nTimeMax; | |
997 | printf("AliTRDdigitizer::MakeDigits -- "); | |
998 | printf("Found %d digits in detector %d (%3.0f).\n" | |
999 | ,nDigits,iDet | |
1000 | ,100.0 * ((Float_t) nDigits) / nPixel); | |
1001 | ||
1002 | if (fCompress) signals->Compress(1,0); | |
1003 | ||
1004 | } | |
1005 | ||
1006 | printf("AliTRDdigitizer::MakeDigits -- "); | |
1007 | printf("Total number of analyzed hits = %d\n",countHits); | |
1008 | ||
1009 | printf("AliTRDdigitizer::MakeDigits -- "); | |
1010 | printf("Total digits data size = %d, %d, %d, %d\n",totalSizeDigits | |
1011 | ,totalSizeDict0 | |
1012 | ,totalSizeDict1 | |
1013 | ,totalSizeDict2); | |
1014 | ||
1015 | return kTRUE; | |
1016 | ||
1017 | } | |
1018 | ||
1019 | //_____________________________________________________________________________ | |
1020 | Bool_t AliTRDdigitizer::CheckDetector(Int_t plane, Int_t chamber, Int_t sector) | |
1021 | { | |
1022 | // | |
1023 | // Checks whether a detector is enabled | |
1024 | // | |
1025 | ||
1026 | if ((fTRD->GetSensChamber() >= 0) && | |
1027 | (fTRD->GetSensChamber() != chamber)) return kFALSE; | |
1028 | if ((fTRD->GetSensPlane() >= 0) && | |
1029 | (fTRD->GetSensPlane() != plane)) return kFALSE; | |
1030 | if ( fTRD->GetSensSector() >= 0) { | |
1031 | Int_t sens1 = fTRD->GetSensSector(); | |
1032 | Int_t sens2 = sens1 + fTRD->GetSensSectorRange(); | |
1033 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) | |
1034 | * AliTRDgeometry::Nsect(); | |
1035 | if (sens1 < sens2) { | |
1036 | if ((sector < sens1) || (sector >= sens2)) return kFALSE; | |
1037 | } | |
1038 | else { | |
1039 | if ((sector < sens1) && (sector >= sens2)) return kFALSE; | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | return kTRUE; | |
1044 | ||
1045 | } | |
1046 | ||
1047 | //_____________________________________________________________________________ | |
1048 | Bool_t AliTRDdigitizer::WriteDigits() | |
1049 | { | |
1050 | // | |
1051 | // Writes out the TRD-digits and the dictionaries | |
1052 | // | |
1053 | ||
1054 | // Create the branches | |
1055 | if (!(gAlice->TreeD()->GetBranch("TRDdigits"))) { | |
1056 | if (!fDigits->MakeBranch()) return kFALSE; | |
1057 | } | |
1058 | ||
1059 | // Store the digits and the dictionary in the tree | |
1060 | fDigits->WriteDigits(); | |
1061 | ||
1062 | // Write the new tree into the input file (use overwrite option) | |
1063 | Char_t treeName[7]; | |
1064 | sprintf(treeName,"TreeD%d",fEvent); | |
1065 | printf("AliTRDdigitizer::WriteDigits -- "); | |
1066 | printf("Write the digits tree %s for event %d.\n" | |
1067 | ,treeName,fEvent); | |
1068 | gAlice->TreeD()->Write(treeName,TObject::kOverwrite); | |
1069 | ||
1070 | return kTRUE; | |
1071 | ||
1072 | } | |
1073 | ||
1074 | //_____________________________________________________________________________ | |
1075 | void AliTRDdigitizer::SetPRF(TF1 *prf) | |
1076 | { | |
1077 | // | |
1078 | // Defines a new pad response function | |
1079 | // | |
1080 | ||
1081 | if (fPRF) delete fPRF; | |
1082 | fPRF = prf; | |
1083 | ||
1084 | } | |
1085 | ||
1086 | //_____________________________________________________________________________ | |
1087 | void AliTRDdigitizer::SetTRF(TF1 *trf) | |
1088 | { | |
1089 | // | |
1090 | // Defines a new time response function | |
1091 | // | |
1092 | ||
1093 | if (fTRF) delete fTRF; | |
1094 | fTRF = trf; | |
1095 | ||
1096 | } | |
1097 | ||
1098 | //_____________________________________________________________________________ | |
1099 | Double_t TRFlandau(Double_t *x, Double_t *par) | |
1100 | { | |
1101 | ||
1102 | Double_t xx = x[0]; | |
1103 | Double_t landau = par[0] * TMath::Landau(xx,par[1],par[2]); | |
1104 | ||
1105 | return landau; | |
1106 | ||
1107 | } |