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b86e74f5 | 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 | /* $Id$ */ | |
17 | ||
18 | ///////////////////////////////////////////////////////////////////////////// | |
19 | // | |
20 | // Contain parametrizations to generate atmospheric muons, and also | |
21 | // to generate single muons and muon bundles at surface level. | |
22 | // | |
23 | //Begin_Html | |
24 | /* | |
25 | <img src="picts/AliGenACORDEClass.gif"> | |
26 | </pre> | |
27 | <br clear=left> | |
28 | <font size=+2 color=red> | |
29 | <p>The responsible person for this module is | |
30 | <a href="mailto:Enrique.Gamez.Flores@cern.ch">Enrique Gamez</a>. | |
31 | </font> | |
32 | <pre> | |
33 | */ | |
34 | //End_Html | |
35 | // | |
36 | ///////////////////////////////////////////////////////////////////////////// | |
37 | ||
38 | #include "AliGenACORDE.h" | |
39 | ||
40 | #include <TMCProcess.h> | |
41 | #include <TPDGCode.h> | |
42 | #include <TClonesArray.h> | |
43 | #include <TF1.h> | |
44 | #include <TH1F.h> | |
45 | ||
46 | #include "AliRun.h" | |
47 | #include "AliConst.h" | |
48 | ||
49 | ClassImp(AliGenACORDE) | |
50 | ||
51 | //_____________________________________________________________________________ | |
52 | AliGenACORDE::AliGenACORDE() | |
53 | : AliGenerator(), | |
54 | fIpart(0), | |
55 | fCRMode(kSingleMuons), | |
56 | fCRModeName(0), | |
57 | fXwidth(0), | |
58 | fNx(1), | |
59 | fZwidth(0), | |
60 | fNz(1), | |
61 | fMuonGrid(kFALSE), | |
62 | fZenithMin(0), | |
63 | fZenithMax(0), | |
64 | fAzimuthMin(0), | |
65 | fAzimuthMax(0), | |
66 | fPRange(0), | |
67 | fPResolution(1), | |
68 | fAp(0), | |
69 | fMomentumDist(0), | |
70 | fUnfoldedMomentumDist(0), | |
71 | fZenithDist(0), | |
72 | fPDist(0) | |
73 | { | |
74 | // | |
75 | // Default ctor. | |
76 | // | |
77 | } | |
78 | ||
79 | //_____________________________________________________________________________ | |
80 | AliGenACORDE::AliGenACORDE(Int_t npart) | |
81 | : AliGenerator(npart), | |
82 | fIpart(kMuonMinus), | |
83 | fCRMode(kSingleMuons), | |
84 | fCRModeName(0), | |
85 | fXwidth(0), | |
86 | fNx(1), | |
87 | fZwidth(0), | |
88 | fNz(1), | |
89 | fMuonGrid(kFALSE), | |
90 | fZenithMin(0), | |
91 | fZenithMax(0), | |
92 | fAzimuthMin(0), | |
93 | fAzimuthMax(0), | |
94 | fPRange(0), | |
95 | fPResolution(1), | |
96 | fAp(0), | |
97 | fMomentumDist(0), | |
98 | fUnfoldedMomentumDist(0), | |
99 | fZenithDist(0), | |
100 | fPDist(0) | |
101 | { | |
102 | // | |
103 | // Standard ctor. | |
104 | // | |
105 | fName = "ACORDE"; | |
106 | fTitle = "Cosmic Muons generator"; | |
107 | ||
108 | // Set the origin above the vertex, on the surface. | |
109 | fOrigin[0] = 0.; | |
110 | fOrigin[1] = AliACORDEConstants::Instance()->Depth(); // At the surface by default. | |
111 | fOrigin[2] = 0.; | |
112 | } | |
113 | ||
b86e74f5 | 114 | //_____________________________________________________________________________ |
115 | AliGenACORDE::~AliGenACORDE() | |
116 | { | |
117 | // | |
118 | // Default dtor. | |
119 | // | |
120 | if ( fPDist ) {fPDist->Delete(); delete fPDist; fPDist = 0;} | |
121 | if ( fUnfoldedMomentumDist ) delete fUnfoldedMomentumDist; | |
122 | if ( fMomentumDist ) delete fMomentumDist; | |
123 | if ( fAp ) delete fAp; | |
124 | if ( fCRModeName ) delete fCRModeName; | |
125 | } | |
126 | ||
127 | //_____________________________________________________________________________ | |
128 | void AliGenACORDE::Generate() | |
129 | { | |
130 | // | |
131 | // Generate on one trigger | |
132 | // Call the respective method inside the loop for the number | |
133 | // of tracks per trigger. | |
134 | ||
135 | for (Int_t i = 0; i < fNpart; i++ ) { | |
136 | ||
137 | if ( fCRMode == kMuonBundle ) { | |
138 | this->GenerateOneMuonBundle(); | |
139 | ||
140 | } else if ( fCRMode == kSingleMuons ) { | |
141 | this->GenerateOneSingleMuon(kTRUE); | |
142 | ||
143 | } else { | |
144 | // Generate only single muons following the parametrizations | |
145 | // for atmospheric muons. | |
146 | this->GenerateOneSingleMuon(); | |
147 | ||
148 | } | |
149 | ||
150 | } | |
151 | } | |
152 | ||
153 | //_____________________________________________________________________________ | |
154 | void AliGenACORDE::Init() | |
155 | { | |
156 | // | |
157 | // Initialize some internal methods. | |
158 | // | |
159 | ||
160 | // Determine some specific data members. | |
161 | fPRange = TMath::Abs(fPMax-fPMin); | |
162 | ||
163 | if ( fCRMode == kSingleMuons ) { | |
164 | fCRModeName = new TString("Single Muons"); | |
165 | // Initialisation, check consistency of selected ranges | |
166 | if(TestBit(kPtRange)&&TestBit(kMomentumRange)) | |
167 | Fatal("Init","You should not set the momentum range and the pt range!"); | |
168 | ||
169 | if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange))) | |
170 | Fatal("Init","You should set either the momentum or the pt range!"); | |
171 | ||
172 | } else if ( fCRMode == kMuonBundle ) { | |
173 | fCRModeName = new TString("Muon Bundles"); | |
174 | ||
175 | } else if ( fCRMode == kMuonFlux ) { | |
176 | fCRModeName = new TString("Muon Fluxes"); | |
177 | // Initialize the ditribution functions. | |
178 | this->InitMomentumGeneration(); | |
179 | this->InitZenithalAngleGeneration(); | |
180 | ||
181 | } else { | |
182 | Fatal("Generate", "Generation Mode unknown!\n"); | |
183 | ||
184 | } | |
185 | ||
186 | } | |
187 | ||
188 | //____________________________________________________________________________ | |
189 | void AliGenACORDE::GenerateOneSingleMuon(Bool_t withFlatMomentum) | |
190 | { | |
191 | // | |
192 | // Generate One Single Muon | |
193 | // This method will generate only one muon. | |
194 | // The momentum will be randomly flat distributed if | |
195 | // the paremeter "withFlatMomentum" is set to kTRUE, | |
196 | // otherwise the momentum will generate acordingly the parametrization | |
197 | // given by | |
198 | // and adpted from Bruno Alessandro's implementation with the | |
199 | // CERNLIB to AliRoot. | |
200 | // The "withFlatMomentum" parameter also will be used to generate | |
201 | // the muons with a flat Zenithal angle distribution. | |
202 | // Do the smearing here, so that means per track. | |
203 | ||
204 | Float_t polar[3]= {0,0,0}; // Polarization parameters | |
205 | Float_t origin[3]; | |
206 | Int_t nt; | |
207 | Float_t p[3]; | |
208 | Float_t pmom, pt; | |
209 | Float_t random[6]; | |
210 | ||
211 | // Take the azimuth random. | |
212 | Rndm(random, 2); | |
213 | Float_t azimuth = fAzimuthMin + (fAzimuthMax-fAzimuthMin)*random[0]; | |
214 | Float_t zenith = fZenithMin + (fZenithMax - fZenithMin)*random[1]; | |
215 | ||
216 | if ( withFlatMomentum ) { | |
217 | Rndm(random,3); | |
218 | if(TestBit(kMomentumRange)) { | |
219 | pmom = -( fPMin + random[0]*(fPMax - fPMin) ); // always downwards. | |
220 | pt = pmom*TMath::Sin(zenith*kDegrad); | |
221 | } else { | |
222 | pt = -( fPtMin + random[1]*(fPtMax - fPtMin)); // always downwards. | |
223 | pmom = pt/TMath::Sin(zenith*kDegrad); | |
224 | } | |
225 | ||
226 | } else { | |
227 | if ( fMomentumDist ) { | |
228 | pmom = -this->GetMomentum(); // Always downwards. | |
229 | } else { | |
230 | pmom = -fPMin; | |
231 | } | |
232 | zenith = this->GetZenithAngle(pmom); // In degrees | |
233 | pt = pmom*TMath::Sin(zenith*kDegrad); | |
234 | } | |
235 | ||
236 | p[0] = pt*TMath::Sin(azimuth*kDegrad); | |
237 | p[1] = pmom*TMath::Cos(zenith*kDegrad); | |
238 | p[2] = pt*TMath::Cos(azimuth*kDegrad); | |
239 | ||
240 | // Finaly the origin, with the smearing | |
241 | Rndm(random,6); | |
242 | origin[0] = AliACORDEConstants::Instance()->Depth()*TMath::Tan(zenith*kDegrad)* | |
243 | TMath::Sin(azimuth*kDegrad) | |
244 | + fOsigma[0]* TMath::Cos(2*random[0]*TMath::Pi())*TMath::Sqrt(-2*TMath::Log(random[1])); | |
245 | ||
246 | origin[1] = AliACORDEConstants::Instance()->Depth(); | |
247 | ||
248 | origin[2] = AliACORDEConstants::Instance()->Depth()*TMath::Tan(zenith*kDegrad)* | |
249 | TMath::Cos(azimuth*kDegrad) | |
250 | + fOsigma[2]* TMath::Cos(2*random[2]*TMath::Pi())*TMath::Sqrt(-2*TMath::Log(random[3])); | |
251 | ||
252 | // Put the track on the stack. | |
253 | PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); | |
254 | ||
255 | } | |
256 | ||
257 | //____________________________________________________________________________ | |
258 | void AliGenACORDE::GenerateOneMuonBundle() | |
259 | { | |
260 | // | |
261 | // Generate One Muon Bundle method | |
262 | // This method will generate a bunch of muons following the | |
263 | // procedure of the AliGenScan class. | |
264 | // These muons will be generated with flat momentum. | |
265 | ||
266 | Float_t polar[3]= {0,0,0}; // Polarization parameters | |
267 | Float_t origin[3]; | |
268 | Float_t p[3]; | |
269 | Int_t nt; | |
270 | Float_t pmom; | |
271 | Float_t random[6]; | |
272 | ||
273 | Rndm(random, 3); | |
274 | Float_t zenith = fZenithMin + (fZenithMax - fZenithMin)*random[1]; | |
275 | Float_t azimuth = fAzimuthMin + (fAzimuthMax-fAzimuthMin)*random[2]; | |
276 | //Float_t zenith = 10; | |
277 | //Float_t azimuth = 30; | |
278 | ||
279 | // Generate the kinematics a la AliGenScan (Andreas Morchs) | |
280 | Float_t dx, dz; | |
281 | if ( fNx > 0 ) { | |
282 | dx = fXwidth/fNx; | |
283 | } else { | |
284 | dx = 1e10; | |
285 | //dx = 100.; | |
286 | } | |
287 | ||
288 | if ( fNz > 0 ) { | |
289 | dz = fZwidth/fNz; | |
290 | } else { | |
291 | dz = 1e10; | |
292 | //dz = 100.; | |
293 | } | |
294 | ||
295 | origin[0] = AliACORDEConstants::Instance()->Depth()*TMath::Tan(zenith*kDegrad)* | |
296 | TMath::Sin(azimuth*kDegrad); | |
297 | //origin[0] = 0.; | |
298 | origin[1] = AliACORDEConstants::Instance()->Depth(); | |
299 | //origin[1] = 900; | |
300 | origin[2] = AliACORDEConstants::Instance()->Depth()*TMath::Tan(zenith*kDegrad)* | |
301 | TMath::Cos(azimuth*kDegrad); | |
302 | //origin[2] = 0.; | |
303 | ||
304 | for (Int_t ix = 0; ix < fNx; ix++ ) { | |
305 | for (Int_t iz = 0; iz < fNz; iz++ ) { | |
306 | Rndm(random,6); | |
307 | origin[0]+=ix*dx+2*(random[1]-0.5)*fOsigma[0]; | |
308 | origin[2]+=iz*dz+2*(random[2]-0.5)*fOsigma[2]; | |
309 | if ( random[4] < 0.5 ) { | |
310 | origin[0] = -1*origin[0]; | |
311 | } | |
312 | if ( random[5] < 0.5 ) { | |
313 | origin[2] = -1*origin[2]; | |
314 | } | |
315 | ||
316 | pmom = -(fPMin + random[3] *(fPMax - fPMax) ); // Always downwards | |
317 | p[0] = TMath::Sin(zenith*kDegrad)*TMath::Sin(azimuth*kDegrad)*pmom; | |
318 | p[1] = TMath::Cos(zenith*kDegrad)*pmom; | |
319 | p[2] = TMath::Sin(zenith*kDegrad)*TMath::Cos(azimuth*kDegrad)*pmom; | |
320 | ||
321 | PushTrack(fTrackIt, -1, fIpart, p, origin, polar, 0, kPPrimary, nt); | |
322 | } | |
323 | ||
324 | } | |
325 | ||
326 | } | |
327 | ||
328 | //____________________________________________________________________________ | |
329 | void AliGenACORDE::SetGridRange(Int_t nx,Float_t xwidth, Int_t nz, Float_t zwidth) | |
330 | { | |
331 | // | |
332 | // Define the grid | |
333 | // This data shuold be used for Muon bundles generation. | |
334 | // | |
335 | fXwidth=xwidth; | |
336 | fNx=nx; | |
337 | fZwidth=zwidth; | |
338 | fNz=nz; | |
339 | ||
340 | // Print a message about the use, if the Mode has not been set, or | |
341 | // it has to a different Mode. | |
342 | if ( fCRMode != kMuonBundle ) { | |
343 | Warning("SetRange","You have been specified a grid to generate muon bundles, but seems that you haven't choose this generation mode, or you have already select a different one"); | |
344 | fMuonGrid = kTRUE; | |
345 | } | |
346 | } | |
347 | ||
348 | //____________________________________________________________________________ | |
349 | void AliGenACORDE::InitApWeightFactors() | |
350 | { | |
351 | // | |
352 | // This factors will be to correct the zenithal angle distribution | |
353 | // acording the momentum | |
354 | ||
355 | // | |
356 | // Fill the array for the flux zenith angle dependence. | |
357 | // at the index 0 of fAp[] will be the "factor" if we have a muon | |
358 | // of 0 GeV. | |
359 | Float_t a[6] = {-1.61, -1.50, -1.28, -0.94, -0.61, -0.22}; | |
360 | Float_t p[6] = { 0., 10., 30., 100., 300., 1000.}; | |
361 | ||
362 | // Get the information from the momentum | |
363 | Int_t pEnd = TMath::Abs(TMath::Nint(fPMax/fPResolution)) + 1; | |
364 | // Initialize the Array of floats to hold the a(p) factors. | |
365 | fAp = new TArrayF(pEnd); | |
366 | ||
367 | Int_t index = 0; | |
368 | ||
369 | for (Int_t i = 0; i < pEnd; i++ ) { | |
370 | Float_t currentP = ((Float_t)i)*fPResolution; | |
371 | if ( currentP < p[1] ) index = 0; | |
372 | else if ( currentP >= p[1] && currentP < p[2] ) index = 1; | |
373 | else if ( currentP >= p[2] && currentP < p[3] ) index = 2; | |
374 | else if ( currentP >= p[3] && currentP < p[4] ) index = 3; | |
375 | else if ( currentP >= p[4] ) index = 4; | |
376 | ||
377 | Float_t ap = (currentP -p[index])*(a[index+1] - a[index])/ | |
378 | (p[index+1] - p[index]) + a[index]; | |
379 | fAp->AddAt(ap, i); | |
380 | } | |
381 | ||
382 | } | |
383 | ||
384 | //___________________________________________________________________________ | |
385 | void AliGenACORDE::InitMomentumGeneration() | |
386 | { | |
387 | // | |
388 | // Initialize a funtion to generate the momentum randomly | |
389 | // acording this function. | |
390 | // | |
391 | ||
392 | // Check if we nned to initialize the function | |
393 | if ( fPMin != fPMax ) { | |
394 | ||
395 | // Check also if the function have been defined yet. | |
396 | if ( !fMomentumDist ) { | |
397 | ||
398 | // If not, use this function | |
399 | const char* y = "log10(x)"; | |
400 | ||
401 | const char* h1Coef = "[0]*( %s*%s*%s/2 - (5*%s*%s/2) + 3*%s )"; | |
402 | const char* h2Coef = "[1]*( (-2*%s*%s*%s/3) + (3*%s*%s) - 10*%s/3 + 1 )"; | |
403 | const char* h3Coef = "[2]*( %s*%s*%s/6 - %s*%s/2 + %s/3 )"; | |
404 | const char* s2Coef = "[3]*( %s*%s*%s/3 - 2*%s*%s + 11*%s/3 - 2 )"; | |
405 | ||
406 | const char* h = "%s + %s + %s + %s"; | |
407 | const char* flux = "pow(10., %s)"; | |
408 | const char* normalizedFlux = "0.86*x*x*x*pow(10., %s)"; | |
409 | const char* paramNames[4] = {"H1", "H2", "H3", "S1"}; | |
410 | ||
411 | char buffer1[1024]; | |
412 | char buffer2[1024]; | |
413 | char buffer3[1024]; | |
414 | char buffer4[1024]; | |
415 | char buffer5[1024]; | |
416 | char buffer6[1024]; | |
417 | char buffer7[1024]; | |
418 | ||
419 | sprintf(buffer1, h1Coef, y, y, y, y, y, y); | |
420 | sprintf(buffer2, h2Coef, y, y, y, y, y, y); | |
421 | sprintf(buffer3, h3Coef, y, y, y, y, y, y); | |
422 | sprintf(buffer4, s2Coef, y, y, y, y, y, y); | |
423 | ||
424 | sprintf(buffer5, h, buffer1, buffer2, buffer3, buffer4); | |
425 | ||
426 | sprintf(buffer6, flux, buffer5); | |
427 | ||
428 | fMomentumDist = new TF1("fMomentumDist", buffer6, fPMin, fPMax); | |
429 | sprintf(buffer7, normalizedFlux, buffer5); | |
430 | fUnfoldedMomentumDist = new TF1("fUnfoldedMomentumDist", buffer7, fPMin, fPMax); | |
431 | for (Int_t i = 0; i < 4; i++ ) { | |
432 | fMomentumDist->SetParName(i, paramNames[i]); | |
433 | fUnfoldedMomentumDist->SetParName(i, paramNames[i]); | |
434 | } | |
435 | ||
436 | fMomentumDist->SetParameter(0, 0.133); | |
437 | fMomentumDist->SetParameter(1, -2.521); | |
438 | fMomentumDist->SetParameter(2, -5.78); | |
439 | fMomentumDist->SetParameter(3, -2.11); | |
440 | ||
441 | fUnfoldedMomentumDist->SetParameter(0, 0.133); | |
442 | fUnfoldedMomentumDist->SetParameter(1, -2.521); | |
443 | fUnfoldedMomentumDist->SetParameter(2, -5.78); | |
444 | fUnfoldedMomentumDist->SetParameter(3, -2.11); | |
445 | ||
446 | } | |
447 | ||
448 | } | |
449 | ||
450 | } | |
451 | ||
452 | //____________________________________________________________________________ | |
453 | void AliGenACORDE::InitZenithalAngleGeneration() | |
454 | { | |
455 | // | |
456 | // Initalize a distribution function for the zenith angle. | |
457 | // This angle will be obtained randomly acording this function. | |
458 | // The generated angles will been in degrees. | |
459 | ||
460 | // Check if we need to create the function. | |
461 | if ( fZenithMin != fZenithMax ) { | |
462 | ||
463 | // Check also if another function have been defined. | |
464 | if ( !fZenithDist ) { | |
465 | ||
466 | // initialize the momentum dependent coefficients, a(p) | |
467 | this->InitApWeightFactors(); | |
468 | ||
469 | Int_t pEnd = TMath::Abs(TMath::Nint(fPMax/fPResolution)) + 1; | |
470 | char name[26]; | |
471 | char title[52]; | |
472 | fPDist = new TClonesArray("TH1F", pEnd); | |
473 | TClonesArray &mom = *fPDist; | |
474 | TH1F* zenith = 0; | |
475 | Float_t weight = 0; | |
476 | for ( Int_t i = 0; i < pEnd; i++ ) { | |
477 | // Fill the distribution | |
478 | sprintf(name, "zenith%d", i+1); | |
479 | sprintf(title, "Zenith distribution, p=%f", fPMin+(Float_t)i); | |
480 | zenith = new(mom[i]) TH1F(name, title, TMath::Abs(TMath::Nint(fZenithMax-fZenithMin)), TMath::Cos(fZenithMax*TMath::Pi()/180), TMath::Cos(fZenithMin*TMath::Pi()/180)); | |
481 | ||
482 | // Make a loop for the angle and fill the histogram for the weight | |
483 | Int_t steps = 1000; | |
484 | Float_t value = 0; | |
485 | for (Int_t j = 0; j < steps; j++ ) { | |
486 | value = TMath::Cos(fZenithMin*TMath::Pi()/180) + (Float_t)j * ( TMath::Cos(fZenithMax*TMath::Pi()/180) - TMath::Cos(fZenithMin*TMath::Pi()/180))/1000; | |
487 | weight = 1 + fAp->At(i)*(1 - value); | |
488 | zenith->Fill(value, weight); | |
489 | } | |
490 | ||
491 | } | |
492 | ||
493 | } | |
494 | ||
495 | } | |
496 | ||
497 | } | |
498 | ||
499 | //____________________________________________________________________________ | |
500 | Float_t AliGenACORDE::GetZenithAngle(Float_t mom) const | |
501 | { | |
502 | ||
503 | Float_t zenith = 0.; | |
504 | // Check if you need to generate a constant zenith angle. | |
505 | if ( !fZenithDist ) { | |
506 | // Check if you have defined an array of momentum functions | |
507 | if ( fPDist ) { | |
508 | Int_t pIndex = TMath::Abs(TMath::Nint(mom)); | |
509 | TH1F* cosZenithAngle = (TH1F*)fPDist->UncheckedAt(pIndex); | |
510 | Float_t tmpzenith = TMath::ACos(cosZenithAngle->GetRandom()); | |
511 | // Correct the value | |
512 | zenith = kRaddeg*tmpzenith; | |
513 | return zenith; | |
514 | } else { | |
515 | ||
516 | if ( fCRMode != kMuonFlux ) { | |
517 | // If you aren't generating muons obeying any ditribution | |
518 | // only generate a flat zenith angle, acording the input settings | |
519 | Float_t random[2]; | |
520 | Rndm(random, 2); | |
521 | zenith = fZenithMin + (fZenithMax - fZenithMin)*random[0]; | |
522 | ||
523 | } else { | |
524 | // Even if you are generating muons acording some distribution, | |
525 | // but you don't want to ... | |
526 | zenith = fZenithMin; | |
527 | ||
528 | } | |
529 | ||
530 | } | |
531 | } else { | |
532 | zenith = fZenithDist->GetRandom(); | |
533 | } | |
534 | ||
535 | return zenith; | |
536 | } | |
537 | ||
538 | //_____________________________________________________________________________ | |
539 | Float_t AliGenACORDE::GetMomentum() const | |
540 | { | |
541 | // | |
542 | // | |
543 | // | |
544 | return fMomentumDist->GetRandom(); | |
545 | } |