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fe4da5cc | 1 | /////////////////////////////////////////////////////////////////// |
2 | // // | |
3 | // Generate the final state of the interaction as the input // | |
4 | // to the MonteCarlo // | |
5 | // | |
6 | //Begin_Html | |
7 | /* | |
8 | <img src="gif/AliGeneratorClass.gif"> | |
9 | </pre> | |
10 | <br clear=left> | |
11 | <font size=+2 color=red> | |
12 | <p>The responsible person for this module is | |
13 | <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>. | |
14 | </font> | |
15 | <pre> | |
16 | */ | |
17 | //End_Html | |
18 | // // | |
19 | /////////////////////////////////////////////////////////////////// | |
20 | ||
21 | #include "AliSimpleGen.h" | |
22 | #include "AliRun.h" | |
23 | ||
24 | ClassImp(AliGenHIJINGpara) | |
25 | ||
26 | //_____________________________________________________________________________ | |
27 | static Double_t ptpi(Double_t *px, Double_t *) | |
28 | { | |
29 | // | |
30 | // PT-PARAMETERIZATION CDF, PRL 61(88) 1819 | |
31 | // POWER LAW FOR PT > 500 MEV | |
32 | // MT SCALING BELOW (T=160 MEV) | |
33 | // | |
34 | const Double_t p0 = 1.3; | |
35 | const Double_t xn = 8.28; | |
36 | const Double_t xlim=0.5; | |
37 | const Double_t t=0.160; | |
38 | const Double_t xmpi=0.139; | |
39 | const Double_t b=1.; | |
40 | Double_t y, y1, xmpi2, ynorm, a; | |
41 | Double_t x=*px; | |
42 | // | |
43 | y1=TMath::Power(p0/(p0+xlim),xn); | |
44 | xmpi2=xmpi*xmpi; | |
45 | ynorm=b*(TMath::Exp(-sqrt(xlim*xlim+xmpi2)/t)); | |
46 | a=ynorm/y1; | |
47 | if (x > xlim) | |
48 | y=a*TMath::Power(p0/(p0+x),xn); | |
49 | else | |
50 | y=b*TMath::Exp(-sqrt(x*x+xmpi2)/t); | |
51 | return y*x; | |
52 | } | |
53 | ||
54 | //_____________________________________________________________________________ | |
55 | static Double_t ptscal(Double_t pt, Int_t np) | |
56 | { | |
57 | // SCALING EN MASSE PAR RAPPORT A PTPI | |
58 | // MASS PI,K,ETA,RHO,OMEGA,ETA',PHI | |
59 | const Double_t hm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0}; | |
60 | // VALUE MESON/PI AT 5 GEV | |
61 | const Double_t fmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0}; | |
62 | np--; | |
63 | Double_t f5=TMath::Power(((sqrt(100.018215)+2.)/(sqrt(100.+hm[np]*hm[np])+2.0)),12.3); | |
64 | Double_t fmax2=f5/fmax[np]; | |
65 | // PIONS | |
66 | Double_t ptpion=100.*ptpi(&pt, (Double_t*) 0); | |
67 | Double_t fmtscal=TMath::Power(((sqrt(pt*pt+0.018215)+2.)/ | |
68 | (sqrt(pt*pt+hm[np]*hm[np])+2.0)),12.3)/ fmax2; | |
69 | return fmtscal*ptpion; | |
70 | } | |
71 | ||
72 | //_____________________________________________________________________________ | |
73 | static Double_t ptka( Double_t *px, Double_t *) | |
74 | { | |
75 | // | |
76 | // pt parametrisation for k | |
77 | // | |
78 | return ptscal(*px,2); | |
79 | } | |
80 | ||
81 | ||
82 | //_____________________________________________________________________________ | |
83 | static Double_t etapic( Double_t *py, Double_t *) | |
84 | { | |
85 | // | |
86 | // eta parametrisation for pi | |
87 | // | |
88 | const Double_t a1 = 4913.; | |
89 | const Double_t a2 = 1819.; | |
90 | const Double_t eta1 = 0.22; | |
91 | const Double_t eta2 = 3.66; | |
92 | const Double_t deta1 = 1.47; | |
93 | const Double_t deta2 = 1.51; | |
94 | Double_t y=TMath::Abs(*py); | |
95 | // | |
96 | Double_t ex1 = (y-eta1)*(y-eta1)/(2*deta1*deta1); | |
97 | Double_t ex2 = (y-eta2)*(y-eta2)/(2*deta2*deta2); | |
98 | return a1*TMath::Exp(-ex1)+a2*TMath::Exp(-ex2); | |
99 | } | |
100 | ||
101 | //_____________________________________________________________________________ | |
102 | static Double_t etakac( Double_t *py, Double_t *) | |
103 | { | |
104 | // | |
105 | // eta parametrisation for ka | |
106 | // | |
107 | const Double_t a1 = 497.6; | |
108 | const Double_t a2 = 215.6; | |
109 | const Double_t eta1 = 0.79; | |
110 | const Double_t eta2 = 4.09; | |
111 | const Double_t deta1 = 1.54; | |
112 | const Double_t deta2 = 1.40; | |
113 | Double_t y=TMath::Abs(*py); | |
114 | // | |
115 | Double_t ex1 = (y-eta1)*(y-eta1)/(2*deta1*deta1); | |
116 | Double_t ex2 = (y-eta2)*(y-eta2)/(2*deta2*deta2); | |
117 | return a1*TMath::Exp(-ex1)+a2*TMath::Exp(-ex2); | |
118 | } | |
119 | ||
120 | //_____________________________________________________________________________ | |
121 | AliGenHIJINGpara::AliGenHIJINGpara() | |
122 | :AliGenerator() | |
123 | { | |
124 | // | |
125 | // Default constructor | |
126 | // | |
127 | fPtpi = 0; | |
128 | fPtka = 0; | |
129 | fETApic = 0; | |
130 | fETAkac = 0; | |
131 | } | |
132 | ||
133 | //_____________________________________________________________________________ | |
134 | AliGenHIJINGpara::AliGenHIJINGpara(Int_t npart) | |
135 | :AliGenerator(npart) | |
136 | { | |
137 | // | |
138 | // Standard constructor | |
139 | // | |
140 | fName="HIGINGpara"; | |
141 | fTitle="HIJING Parametrisation Particle Generator"; | |
142 | fPtpi = 0; | |
143 | fPtka = 0; | |
144 | fETApic = 0; | |
145 | fETAkac = 0; | |
146 | } | |
147 | ||
148 | //_____________________________________________________________________________ | |
149 | AliGenHIJINGpara::~AliGenHIJINGpara() | |
150 | { | |
151 | // | |
152 | // Standard destructor | |
153 | // | |
154 | delete fPtpi; | |
155 | delete fPtka; | |
156 | delete fETApic; | |
157 | delete fETAkac; | |
158 | } | |
159 | ||
160 | //_____________________________________________________________________________ | |
161 | void AliGenHIJINGpara::Init() | |
162 | { | |
163 | // | |
164 | // Initialise the HIJING parametrisation | |
165 | // | |
166 | Float_t etaMin = -TMath::Log(TMath::Tan(TMath::Min((Double_t)fThetaMax/2,TMath::Pi()/2-1.e-10))); | |
167 | Float_t etaMax = -TMath::Log(TMath::Tan(TMath::Max((Double_t)fThetaMin/2, 1.e-10))); | |
168 | fPtpi = new TF1("ptpi",&ptpi,0,20,0); | |
169 | fPtka = new TF1("ptka",&ptka,0,20,0); | |
170 | fETApic = new TF1("etapic",&etapic,etaMin,etaMax,0); | |
171 | fETAkac = new TF1("etakac",&etakac,etaMin,etaMax,0); | |
172 | TF1 *ETApic0 = new TF1("etapic",&etapic,-7,7,0); | |
173 | TF1 *ETAkac0 = new TF1("etakac",&etakac,-7,7,0); | |
174 | Float_t IntETApi = ETApic0->Integral(-0.5, 0.5); | |
175 | Float_t IntETAka = ETAkac0->Integral(-0.5, 0.5); | |
176 | Float_t scalePi=7316/(IntETApi/1.5); | |
177 | Float_t scaleKa= 684/(IntETAka/2.0); | |
178 | ||
179 | Float_t IntPt = (0.877*ETApic0->Integral(0, 15)+ | |
180 | 0.123*ETAkac0->Integral(0, 15)); | |
181 | Float_t IntPtSel = (0.877*ETApic0->Integral(fPtMin, fPtMax)+ | |
182 | 0.123*ETAkac0->Integral(fPtMin, fPtMax)); | |
183 | Float_t PtFrac = IntPtSel/IntPt; | |
184 | ||
185 | ||
186 | Float_t IntETASel = (scalePi*ETApic0->Integral(etaMin, etaMax)+ | |
187 | scaleKa*ETAkac0->Integral(etaMin, etaMax)); | |
188 | Float_t PhiFrac = (fPhiMax-fPhiMin)/2/TMath::Pi(); | |
189 | fParentWeight = Float_t(fNpart)/IntETASel*PtFrac*PhiFrac; | |
190 | ||
191 | printf("\n The number of particles in the selected kinematic region corresponds to %f percent of a full event\n ", 100.*fParentWeight); | |
192 | ||
193 | } | |
194 | ||
195 | //_____________________________________________________________________________ | |
196 | void AliGenHIJINGpara::Generate() | |
197 | { | |
198 | // | |
199 | // Generate one trigger | |
200 | // | |
201 | ||
202 | AliMC* pMC = AliMC::GetMC(); | |
203 | ||
204 | const Float_t raKpic=0.14; | |
205 | const Float_t borne=1/(1+raKpic); | |
206 | Float_t polar[3]= {0,0,0}; | |
207 | // | |
208 | const Int_t pi0=7; | |
209 | const Int_t piplus=8; | |
210 | const Int_t piminus=9; | |
211 | const Int_t k0l=10; | |
212 | const Int_t k0s=16; | |
213 | const Int_t kplus=11; | |
214 | const Int_t kminus=12; | |
215 | // | |
216 | const Int_t pions[3] = {pi0, piplus, piminus}; | |
217 | const Int_t kaons[4] = {k0l, k0s, kplus, kminus}; | |
218 | // | |
219 | Float_t origin[3]; | |
220 | Float_t pt, pl, ptot; | |
221 | Float_t phi, theta; | |
222 | Float_t p[3]; | |
223 | Int_t i, part, nt, j; | |
224 | // | |
225 | TF1 *ptf; | |
226 | TF1 *etaf; | |
227 | // | |
228 | Float_t random[6]; | |
229 | // | |
230 | for (j=0;j<3;j++) origin[j]=fOrigin[j]; | |
231 | if(fVertexSmear==perEvent) { | |
232 | pMC->Rndm(random,6); | |
233 | for (j=0;j<3;j++) { | |
234 | origin[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
235 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
236 | } | |
237 | } | |
238 | for(i=0;i<fNpart;i++) { | |
239 | while(1) { | |
240 | pMC->Rndm(random,3); | |
241 | if(random[0]<borne) { | |
242 | part=pions[Int_t (random[1]*3)]; | |
243 | ptf=fPtpi; | |
244 | etaf=fETApic; | |
245 | } else { | |
246 | part=kaons[Int_t (random[1]*4)]; | |
247 | ptf=fPtka; | |
248 | etaf=fETAkac; | |
249 | } | |
250 | phi=2*random[2]*TMath::Pi(); | |
251 | if(phi<fPhiMin || phi>fPhiMax) continue; | |
252 | theta=2*TMath::ATan(TMath::Exp(-etaf->GetRandom())); | |
253 | if(theta<fThetaMin || theta>fThetaMax) continue; | |
254 | pt=ptf->GetRandom(); | |
255 | pl=pt/TMath::Tan(theta); | |
256 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
257 | if(ptot<fPMin || ptot>fPMax) continue; | |
258 | p[0]=pt*TMath::Cos(phi); | |
259 | p[1]=pt*TMath::Sin(phi); | |
260 | p[2]=pl; | |
261 | if(fVertexSmear==perTrack) { | |
262 | pMC->Rndm(random,6); | |
263 | for (j=0;j<3;j++) { | |
264 | origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
265 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
266 | } | |
267 | } | |
268 | gAlice->SetTrack(1,-1,part,p,origin,polar,0,"Primary",nt,fParentWeight); | |
269 | break; | |
270 | } | |
271 | } | |
272 | } | |
273 | ||
274 | ClassImp(AliGenFixed) | |
275 | ||
276 | //_____________________________________________________________________________ | |
277 | AliGenFixed::AliGenFixed() | |
278 | :AliGenerator() | |
279 | { | |
280 | // | |
281 | // Default constructor | |
282 | // | |
283 | fIpart = 0; | |
284 | } | |
285 | ||
286 | //_____________________________________________________________________________ | |
287 | AliGenFixed::AliGenFixed(Int_t npart) | |
288 | :AliGenerator(npart) | |
289 | { | |
290 | // | |
291 | // Standard constructor | |
292 | // | |
293 | fName="Fixed"; | |
294 | fTitle="Fixed Particle Generator"; | |
295 | // Generate Proton by default | |
296 | fIpart=14; | |
297 | } | |
298 | ||
299 | //_____________________________________________________________________________ | |
300 | void AliGenFixed::Generate() | |
301 | { | |
302 | // | |
303 | // Generate one trigger | |
304 | // | |
305 | Float_t polar[3]= {0,0,0}; | |
306 | Float_t p[3] = {fPMin*TMath::Cos(fPhiMin)*TMath::Sin(fThetaMin), | |
307 | fPMin*TMath::Sin(fPhiMin)*TMath::Sin(fThetaMin), | |
308 | fPMin*TMath::Cos(fThetaMin)}; | |
309 | Int_t i, nt; | |
310 | // | |
311 | for(i=0;i<fNpart;i++) { | |
312 | gAlice->SetTrack(1,-1,fIpart,p,fOrigin.GetArray(),polar,0,"Primary",nt); | |
313 | } | |
314 | } | |
315 | ||
316 | //_____________________________________________________________________________ | |
317 | void AliGenFixed::SetSigma(Float_t, Float_t, Float_t) | |
318 | { | |
319 | // | |
320 | // Set the interaction point sigma | |
321 | // | |
322 | printf("Vertex smearing not implemented for fixed generator\n"); | |
323 | } | |
324 | ||
325 | ||
326 | ClassImp(AliGenBox) | |
327 | ||
328 | //_____________________________________________________________________________ | |
329 | AliGenBox::AliGenBox() | |
330 | :AliGenerator() | |
331 | { | |
332 | // | |
333 | // Default constructor | |
334 | // | |
335 | fIpart=0; | |
336 | } | |
337 | ||
338 | //_____________________________________________________________________________ | |
339 | AliGenBox::AliGenBox(Int_t npart) | |
340 | :AliGenerator(npart) | |
341 | { | |
342 | // | |
343 | // Standard constructor | |
344 | // | |
345 | fName="Box"; | |
346 | fTitle="Box particle generator"; | |
347 | // Generate Proton by default | |
348 | fIpart=14; | |
349 | } | |
350 | ||
351 | //_____________________________________________________________________________ | |
352 | void AliGenBox::Generate() | |
353 | { | |
354 | // | |
355 | // Generate one trigger | |
356 | // | |
357 | AliMC* pMC = AliMC::GetMC(); | |
358 | ||
359 | Float_t polar[3]= {0,0,0}; | |
360 | // | |
361 | Float_t origin[3]; | |
362 | Float_t p[3]; | |
363 | Int_t i, j, nt; | |
364 | Float_t pmom, theta, phi; | |
365 | // | |
366 | Float_t random[6]; | |
367 | // | |
368 | for (j=0;j<3;j++) origin[j]=fOrigin[j]; | |
369 | if(fVertexSmear==perEvent) { | |
370 | pMC->Rndm(random,6); | |
371 | for (j=0;j<3;j++) { | |
372 | origin[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
373 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
374 | } | |
375 | } | |
376 | for(i=0;i<fNpart;i++) { | |
377 | pMC->Rndm(random,3); | |
378 | pmom=fPMin+random[0]*(fPMax-fPMin); | |
379 | theta=fThetaMin+random[1]*(fThetaMax-fThetaMin); | |
380 | phi=fPhiMin+random[2]*(fPhiMax-fPhiMin); | |
381 | p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta); | |
382 | p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta); | |
383 | p[2] = pmom*TMath::Cos(theta); | |
384 | if(fVertexSmear==perTrack) { | |
385 | pMC->Rndm(random,6); | |
386 | for (j=0;j<3;j++) { | |
387 | origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
388 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
389 | } | |
390 | } | |
391 | gAlice->SetTrack(1,-1,fIpart,p,origin,polar,0,"Primary",nt); | |
392 | } | |
393 | } | |
394 | ||
395 |