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fe4da5cc | 1 | #include "AliGenMUONlib.h" |
2 | #include "AliRun.h" | |
3 | ClassImp(AliGenMUONlib) | |
4 | // | |
5 | // Pions | |
6 | Double_t AliGenMUONlib::PtPion(Double_t *px, Double_t *) | |
7 | { | |
8 | // | |
9 | // PT-PARAMETERIZATION CDF, PRL 61(88) 1819 | |
10 | // POWER LAW FOR PT > 500 MEV | |
11 | // MT SCALING BELOW (T=160 MEV) | |
12 | // | |
13 | const Double_t p0 = 1.3; | |
14 | const Double_t xn = 8.28; | |
15 | const Double_t xlim=0.5; | |
16 | const Double_t t=0.160; | |
17 | const Double_t xmpi=0.139; | |
18 | const Double_t b=1.; | |
19 | Double_t y, y1, xmpi2, ynorm, a; | |
20 | Double_t x=*px; | |
21 | // | |
22 | y1=TMath::Power(p0/(p0+xlim),xn); | |
23 | xmpi2=xmpi*xmpi; | |
24 | ynorm=b*(TMath::Exp(-sqrt(xlim*xlim+xmpi2)/t)); | |
25 | a=ynorm/y1; | |
26 | if (x > xlim) | |
27 | y=a*TMath::Power(p0/(p0+x),xn); | |
28 | else | |
29 | y=b*TMath::Exp(-sqrt(x*x+xmpi2)/t); | |
30 | return y*x; | |
31 | } | |
753690b0 | 32 | // |
33 | // y-distribution | |
34 | // | |
35 | Double_t AliGenMUONlib::YPion( Double_t *py, Double_t *) | |
36 | { | |
37 | const Double_t a = 7000.; | |
38 | const Double_t dy = 4.; | |
39 | ||
40 | Double_t y=TMath::Abs(*py); | |
41 | // | |
42 | Double_t ex = y*y/(2*dy*dy); | |
43 | return a*TMath::Exp(-ex); | |
44 | } | |
45 | // particle composition | |
46 | // | |
47 | Int_t AliGenMUONlib::IpPion() | |
48 | { | |
49 | AliMC* pMC = AliMC::GetMC(); | |
50 | Float_t random[1]; | |
51 | pMC->Rndm(random,1); | |
52 | if (random[0] < 0.5) { | |
53 | return 211; | |
54 | } else { | |
55 | return -211; | |
56 | } | |
57 | } | |
fe4da5cc | 58 | |
59 | //____________________________________________________________ | |
60 | // | |
61 | // Mt-scaling | |
62 | ||
63 | Double_t AliGenMUONlib::PtScal(Double_t pt, Int_t np) | |
64 | { | |
65 | // SCALING EN MASSE PAR RAPPORT A PTPI | |
66 | // MASS PI,K,ETA,RHO,OMEGA,ETA',PHI | |
67 | const Double_t hm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0}; | |
68 | // VALUE MESON/PI AT 5 GEV | |
69 | const Double_t fmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0}; | |
70 | np--; | |
71 | Double_t f5=TMath::Power(((sqrt(100.018215)+2.)/(sqrt(100.+hm[np]*hm[np])+2.0)),12.3); | |
72 | Double_t fmax2=f5/fmax[np]; | |
73 | // PIONS | |
74 | Double_t ptpion=100.*PtPion(&pt, (Double_t*) 0); | |
75 | Double_t fmtscal=TMath::Power(((sqrt(pt*pt+0.018215)+2.)/ | |
76 | (sqrt(pt*pt+hm[np]*hm[np])+2.0)),12.3)/ fmax2; | |
77 | return fmtscal*ptpion; | |
78 | } | |
79 | // | |
753690b0 | 80 | // kaon |
81 | // | |
82 | // pt-distribution | |
83 | //____________________________________________________________ | |
84 | Double_t AliGenMUONlib::PtKaon( Double_t *px, Double_t *) | |
85 | { | |
86 | return PtScal(*px,2); | |
87 | } | |
88 | ||
89 | // y-distribution | |
fe4da5cc | 90 | //____________________________________________________________ |
753690b0 | 91 | Double_t AliGenMUONlib::YKaon( Double_t *py, Double_t *) |
fe4da5cc | 92 | { |
753690b0 | 93 | const Double_t a = 1000.; |
94 | const Double_t dy = 4.; | |
95 | ||
96 | ||
fe4da5cc | 97 | Double_t y=TMath::Abs(*py); |
98 | // | |
753690b0 | 99 | Double_t ex = y*y/(2*dy*dy); |
100 | return a*TMath::Exp(-ex); | |
101 | } | |
102 | ||
103 | // particle composition | |
104 | // | |
105 | Int_t AliGenMUONlib::IpKaon() | |
106 | { | |
107 | AliMC* pMC = AliMC::GetMC(); | |
108 | Float_t random[1]; | |
109 | pMC->Rndm(random,1); | |
110 | if (random[0] < 0.5) { | |
111 | return 321; | |
112 | } else { | |
113 | return -321; | |
114 | } | |
fe4da5cc | 115 | } |
753690b0 | 116 | |
fe4da5cc | 117 | // J/Psi |
118 | // | |
119 | // | |
120 | // pt-distribution | |
121 | //____________________________________________________________ | |
122 | Double_t AliGenMUONlib::PtJpsi( Double_t *px, Double_t *) | |
123 | { | |
124 | const Double_t pt0 = 4.; | |
125 | const Double_t xn = 3.6; | |
126 | Double_t x=*px; | |
127 | // | |
128 | Double_t pass1 = 1.+(x/pt0)*(x/pt0); | |
129 | return x/TMath::Power(pass1,xn); | |
130 | } | |
131 | // | |
132 | // y-distribution | |
133 | //____________________________________________________________ | |
134 | Double_t AliGenMUONlib::YJpsi(Double_t *py, Double_t *) | |
135 | { | |
136 | const Double_t y0 = 4.; | |
137 | const Double_t b=1.; | |
138 | Double_t yj; | |
139 | Double_t y=TMath::Abs(*py); | |
140 | // | |
141 | if (y < y0) | |
142 | yj=b; | |
143 | else | |
144 | yj=b*TMath::Exp(-(y-y0)*(y-y0)/2); | |
145 | return yj; | |
146 | } | |
147 | // particle composition | |
148 | // | |
149 | Int_t AliGenMUONlib::IpJpsi() | |
150 | { | |
151 | return 443; | |
152 | } | |
153 | ||
154 | // Upsilon | |
155 | // | |
156 | // | |
157 | // pt-distribution | |
158 | //____________________________________________________________ | |
159 | Double_t AliGenMUONlib::PtUpsilon( Double_t *px, Double_t * ) | |
160 | { | |
161 | const Double_t pt0 = 5.3; | |
162 | const Double_t xn = 2.5; | |
163 | Double_t x=*px; | |
164 | // | |
165 | Double_t pass1 = 1.+(x/pt0)*(x/pt0); | |
166 | return x/TMath::Power(pass1,xn); | |
167 | } | |
168 | // | |
169 | // y-distribution | |
170 | // | |
171 | //____________________________________________________________ | |
172 | Double_t AliGenMUONlib::YUpsilon(Double_t *py, Double_t *) | |
173 | { | |
174 | const Double_t y0 = 3.; | |
175 | const Double_t b=1.; | |
176 | Double_t yu; | |
177 | Double_t y=TMath::Abs(*py); | |
178 | // | |
179 | if (y < y0) | |
180 | yu=b; | |
181 | else | |
182 | yu=b*TMath::Exp(-(y-y0)*(y-y0)/2); | |
183 | return yu; | |
184 | } | |
185 | // particle composition | |
186 | // | |
187 | Int_t AliGenMUONlib::IpUpsilon() | |
188 | { | |
189 | return 553; | |
190 | } | |
191 | ||
192 | // | |
193 | // Phi | |
194 | // | |
195 | // | |
196 | // pt-distribution (by scaling of pion distribution) | |
197 | //____________________________________________________________ | |
198 | Double_t AliGenMUONlib::PtPhi( Double_t *px, Double_t *) | |
199 | { | |
200 | return PtScal(*px,7); | |
201 | } | |
202 | // y-distribution | |
203 | Double_t AliGenMUONlib::YPhi( Double_t *px, Double_t *) | |
204 | { | |
ccdc344b | 205 | Double_t *dummy=0; |
fe4da5cc | 206 | return YJpsi(px,dummy); |
207 | } | |
208 | // particle composition | |
209 | // | |
210 | Int_t AliGenMUONlib::IpPhi() | |
211 | { | |
212 | return 41; | |
213 | } | |
214 | ||
215 | // | |
216 | // Charm | |
217 | // | |
218 | // | |
219 | // pt-distribution | |
220 | //____________________________________________________________ | |
221 | Double_t AliGenMUONlib::PtCharm( Double_t *px, Double_t *) | |
222 | { | |
223 | const Double_t pt0 = 4.08; | |
224 | const Double_t xn = 9.40; | |
225 | Double_t x=*px; | |
226 | // | |
227 | Double_t pass1 = 1.+(x/pt0)*(x/pt0); | |
228 | return x/TMath::Power(pass1,xn); | |
229 | } | |
230 | // y-distribution | |
231 | Double_t AliGenMUONlib::YCharm( Double_t *px, Double_t *) | |
232 | { | |
ccdc344b | 233 | Double_t *dummy=0; |
fe4da5cc | 234 | return YJpsi(px,dummy); |
235 | } | |
236 | ||
237 | Int_t AliGenMUONlib::IpCharm() | |
238 | { | |
239 | AliMC* pMC = AliMC::GetMC(); | |
240 | Float_t random[2]; | |
241 | Int_t ip; | |
242 | // 411,421,431,4122 | |
243 | pMC->Rndm(random,2); | |
244 | if (random[0] < 0.5) { | |
245 | ip=411; | |
246 | } else if (random[0] < 0.75) { | |
247 | ip=421; | |
248 | } else if (random[0] < 0.90) { | |
249 | ip=431; | |
250 | } else { | |
251 | ip=4122; | |
252 | } | |
253 | if (random[1] < 0.5) {ip=-ip;} | |
254 | ||
255 | return ip; | |
256 | } | |
257 | ||
258 | ||
259 | // | |
260 | // Beauty | |
261 | // | |
262 | // | |
263 | // pt-distribution | |
264 | //____________________________________________________________ | |
265 | Double_t AliGenMUONlib::PtBeauty( Double_t *px, Double_t *) | |
266 | { | |
267 | const Double_t pt0 = 4.; | |
268 | const Double_t xn = 3.6; | |
269 | Double_t x=*px; | |
270 | // | |
271 | Double_t pass1 = 1.+(x/pt0)*(x/pt0); | |
272 | return x/TMath::Power(pass1,xn); | |
273 | } | |
274 | // y-distribution | |
275 | Double_t AliGenMUONlib::YBeauty( Double_t *px, Double_t *) | |
276 | { | |
ccdc344b | 277 | Double_t *dummy=0; |
fe4da5cc | 278 | return YJpsi(px,dummy); |
279 | } | |
280 | ||
281 | Int_t AliGenMUONlib::IpBeauty() | |
282 | { | |
283 | AliMC* pMC = AliMC::GetMC(); | |
284 | Float_t random[2]; | |
285 | Int_t ip; | |
286 | pMC->Rndm(random,2); | |
287 | if (random[0] < 0.5) { | |
288 | ip=511; | |
289 | } else if (random[0] < 0.75) { | |
290 | ip=521; | |
291 | } else if (random[0] < 0.90) { | |
292 | ip=531; | |
293 | } else { | |
294 | ip=5122; | |
295 | } | |
296 | if (random[1] < 0.5) {ip=-ip;} | |
297 | ||
298 | return ip; | |
299 | } | |
300 | ||
301 | typedef Double_t (*GenFunc) (Double_t*, Double_t*); | |
753690b0 | 302 | GenFunc AliGenMUONlib::GetPt(Param_t param) |
fe4da5cc | 303 | { |
304 | GenFunc func; | |
753690b0 | 305 | switch (param) |
fe4da5cc | 306 | { |
753690b0 | 307 | case phi_p: |
fe4da5cc | 308 | func=PtPhi; |
309 | break; | |
753690b0 | 310 | case jpsi_p: |
fe4da5cc | 311 | func=PtJpsi; |
312 | break; | |
753690b0 | 313 | case upsilon_p: |
fe4da5cc | 314 | func=PtUpsilon; |
315 | break; | |
753690b0 | 316 | case charm_p: |
fe4da5cc | 317 | func=PtCharm; |
318 | break; | |
753690b0 | 319 | case beauty_p: |
fe4da5cc | 320 | func=PtBeauty; |
321 | break; | |
753690b0 | 322 | case pion_p: |
323 | func=PtPion; | |
324 | break; | |
325 | case kaon_p: | |
326 | func=PtKaon; | |
327 | break; | |
fe4da5cc | 328 | } |
329 | return func; | |
330 | } | |
331 | ||
753690b0 | 332 | GenFunc AliGenMUONlib::GetY(Param_t param) |
fe4da5cc | 333 | { |
334 | GenFunc func; | |
753690b0 | 335 | switch (param) |
fe4da5cc | 336 | { |
753690b0 | 337 | case phi_p: |
fe4da5cc | 338 | func=YPhi; |
339 | break; | |
753690b0 | 340 | case jpsi_p: |
fe4da5cc | 341 | func=YJpsi; |
342 | break; | |
753690b0 | 343 | case upsilon_p: |
fe4da5cc | 344 | func=YUpsilon; |
345 | break; | |
753690b0 | 346 | case charm_p: |
fe4da5cc | 347 | func=YCharm; |
348 | break; | |
753690b0 | 349 | case beauty_p: |
fe4da5cc | 350 | func=YBeauty; |
351 | break; | |
753690b0 | 352 | case pion_p: |
353 | func=YPion; | |
354 | break; | |
355 | case kaon_p: | |
356 | func=YKaon; | |
357 | break; | |
fe4da5cc | 358 | } |
359 | return func; | |
360 | } | |
361 | typedef Int_t (*GenFuncIp) (); | |
753690b0 | 362 | GenFuncIp AliGenMUONlib::GetIp(Param_t param) |
fe4da5cc | 363 | { |
364 | GenFuncIp func; | |
753690b0 | 365 | switch (param) |
fe4da5cc | 366 | { |
753690b0 | 367 | case phi_p: |
fe4da5cc | 368 | func=IpPhi; |
369 | break; | |
753690b0 | 370 | case jpsi_p: |
fe4da5cc | 371 | func=IpJpsi; |
372 | break; | |
753690b0 | 373 | case upsilon_p: |
fe4da5cc | 374 | func=IpUpsilon; |
375 | break; | |
753690b0 | 376 | case charm_p: |
fe4da5cc | 377 | func=IpCharm; |
378 | break; | |
753690b0 | 379 | case beauty_p: |
fe4da5cc | 380 | func=IpBeauty; |
381 | break; | |
753690b0 | 382 | case pion_p: |
383 | func=IpPion; | |
384 | break; | |
385 | case kaon_p: | |
386 | func=IpKaon; | |
387 | break; | |
fe4da5cc | 388 | } |
389 | return func; | |
390 | } | |
391 | ||
392 | ||
753690b0 | 393 | |
394 |