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4c039060 | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
4c039060 | 17 | |
53904666 | 18 | // Library class for particle pt and y distributions used for |
19 | // muon spectrometer simulations. | |
20 | // To be used with AliGenParam. | |
21 | // The following particle typed can be simulated: | |
22 | // pi, K, phi, omega, eta, J/Psi, Upsilon, charm and beauty mesons. | |
23 | // | |
24 | // andreas.morsch@cern.ch | |
25 | // | |
26 | ||
65fb704d | 27 | #include "TMath.h" |
28 | #include "TRandom.h" | |
29 | ||
fe4da5cc | 30 | #include "AliGenMUONlib.h" |
5c3fd7ea | 31 | |
fe4da5cc | 32 | ClassImp(AliGenMUONlib) |
33 | // | |
34 | // Pions | |
198bb1c7 | 35 | Double_t AliGenMUONlib::PtPion(Double_t *px, Double_t* /*dummy*/) |
fe4da5cc | 36 | { |
37 | // | |
38 | // PT-PARAMETERIZATION CDF, PRL 61(88) 1819 | |
39 | // POWER LAW FOR PT > 500 MEV | |
40 | // MT SCALING BELOW (T=160 MEV) | |
41 | // | |
d90f80fd | 42 | const Double_t kp0 = 1.3; |
43 | const Double_t kxn = 8.28; | |
44 | const Double_t kxlim=0.5; | |
45 | const Double_t kt=0.160; | |
46 | const Double_t kxmpi=0.139; | |
47 | const Double_t kb=1.; | |
fe4da5cc | 48 | Double_t y, y1, xmpi2, ynorm, a; |
49 | Double_t x=*px; | |
50 | // | |
d90f80fd | 51 | y1=TMath::Power(kp0/(kp0+kxlim),kxn); |
52 | xmpi2=kxmpi*kxmpi; | |
53 | ynorm=kb*(TMath::Exp(-sqrt(kxlim*kxlim+xmpi2)/kt)); | |
fe4da5cc | 54 | a=ynorm/y1; |
d90f80fd | 55 | if (x > kxlim) |
56 | y=a*TMath::Power(kp0/(kp0+x),kxn); | |
fe4da5cc | 57 | else |
d90f80fd | 58 | y=kb*TMath::Exp(-sqrt(x*x+xmpi2)/kt); |
fe4da5cc | 59 | return y*x; |
60 | } | |
753690b0 | 61 | // |
62 | // y-distribution | |
63 | // | |
198bb1c7 | 64 | Double_t AliGenMUONlib::YPion( Double_t *py, Double_t */*dummy*/) |
753690b0 | 65 | { |
d90f80fd | 66 | // Pion y |
2280e6af | 67 | Double_t y=TMath::Abs(*py); |
68 | /* | |
d90f80fd | 69 | const Double_t ka = 7000.; |
70 | const Double_t kdy = 4.; | |
d90f80fd | 71 | Double_t ex = y*y/(2*kdy*kdy); |
72 | return ka*TMath::Exp(-ex); | |
2280e6af | 73 | */ |
74 | return 1.16526e+04+y*-3.79886e+03+y*y*4.31130e+02; | |
75 | ||
753690b0 | 76 | } |
77 | // particle composition | |
78 | // | |
65fb704d | 79 | Int_t AliGenMUONlib::IpPion(TRandom *ran) |
753690b0 | 80 | { |
d90f80fd | 81 | // Pion composition |
65fb704d | 82 | if (ran->Rndm() < 0.5) { |
753690b0 | 83 | return 211; |
84 | } else { | |
85 | return -211; | |
86 | } | |
87 | } | |
fe4da5cc | 88 | |
89 | //____________________________________________________________ | |
90 | // | |
91 | // Mt-scaling | |
92 | ||
93 | Double_t AliGenMUONlib::PtScal(Double_t pt, Int_t np) | |
94 | { | |
95 | // SCALING EN MASSE PAR RAPPORT A PTPI | |
96 | // MASS PI,K,ETA,RHO,OMEGA,ETA',PHI | |
d90f80fd | 97 | const Double_t khm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0}; |
fe4da5cc | 98 | // VALUE MESON/PI AT 5 GEV |
d90f80fd | 99 | const Double_t kfmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0}; |
fe4da5cc | 100 | np--; |
d90f80fd | 101 | Double_t f5=TMath::Power(((sqrt(100.018215)+2.)/(sqrt(100.+khm[np]*khm[np])+2.0)),12.3); |
102 | Double_t fmax2=f5/kfmax[np]; | |
fe4da5cc | 103 | // PIONS |
104 | Double_t ptpion=100.*PtPion(&pt, (Double_t*) 0); | |
105 | Double_t fmtscal=TMath::Power(((sqrt(pt*pt+0.018215)+2.)/ | |
d90f80fd | 106 | (sqrt(pt*pt+khm[np]*khm[np])+2.0)),12.3)/ fmax2; |
fe4da5cc | 107 | return fmtscal*ptpion; |
108 | } | |
109 | // | |
753690b0 | 110 | // kaon |
111 | // | |
112 | // pt-distribution | |
113 | //____________________________________________________________ | |
198bb1c7 | 114 | Double_t AliGenMUONlib::PtKaon( Double_t *px, Double_t */*dummy*/) |
753690b0 | 115 | { |
d90f80fd | 116 | // Kaon pT |
753690b0 | 117 | return PtScal(*px,2); |
118 | } | |
119 | ||
120 | // y-distribution | |
fe4da5cc | 121 | //____________________________________________________________ |
198bb1c7 | 122 | Double_t AliGenMUONlib::YKaon( Double_t *py, Double_t */*dummy*/) |
fe4da5cc | 123 | { |
d90f80fd | 124 | // Kaon y |
2280e6af | 125 | Double_t y=TMath::Abs(*py); |
126 | /* | |
d90f80fd | 127 | const Double_t ka = 1000.; |
128 | const Double_t kdy = 4.; | |
fe4da5cc | 129 | // |
d90f80fd | 130 | Double_t ex = y*y/(2*kdy*kdy); |
131 | return ka*TMath::Exp(-ex); | |
2280e6af | 132 | */ |
133 | ||
134 | return 1.16526e+04+y*-3.79886e+03+y*y*4.31130e+02; | |
753690b0 | 135 | } |
136 | ||
137 | // particle composition | |
138 | // | |
65fb704d | 139 | Int_t AliGenMUONlib::IpKaon(TRandom *ran) |
753690b0 | 140 | { |
d90f80fd | 141 | // Kaon composition |
65fb704d | 142 | if (ran->Rndm() < 0.5) { |
753690b0 | 143 | return 321; |
144 | } else { | |
145 | return -321; | |
146 | } | |
fe4da5cc | 147 | } |
753690b0 | 148 | |
fe4da5cc | 149 | // J/Psi |
150 | // | |
151 | // | |
152 | // pt-distribution | |
153 | //____________________________________________________________ | |
198bb1c7 | 154 | Double_t AliGenMUONlib::PtJpsi( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 155 | { |
d90f80fd | 156 | // J/Psi pT |
157 | const Double_t kpt0 = 4.; | |
158 | const Double_t kxn = 3.6; | |
fe4da5cc | 159 | Double_t x=*px; |
160 | // | |
d90f80fd | 161 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); |
162 | return x/TMath::Power(pass1,kxn); | |
fe4da5cc | 163 | } |
05932df6 | 164 | |
0e137c25 | 165 | Double_t AliGenMUONlib::PtJpsiCDFscaled( Double_t *px, Double_t */*dummy*/) |
166 | { | |
167 | // J/Psi pT | |
48416d65 | 168 | const Double_t kpt0 = 4.703; |
169 | const Double_t kxn = 3.826; | |
0e137c25 | 170 | Double_t x=*px; |
171 | // | |
172 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); | |
173 | return x/TMath::Power(pass1,kxn); | |
174 | } | |
175 | ||
a384decf | 176 | Double_t AliGenMUONlib::PtJpsiFlat( Double_t */*px*/, Double_t */*dummy*/ ) |
4ca8d070 | 177 | { |
178 | return 1.; | |
179 | } | |
180 | ||
198bb1c7 | 181 | Double_t AliGenMUONlib::PtJpsiPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 182 | { |
1af7144e | 183 | // J/Psi pT spectrum |
05932df6 | 184 | // |
185 | // R. Vogt 2002 | |
186 | // PbPb 5.5 TeV | |
187 | // MRST HO | |
188 | // mc = 1.4 GeV, pt-kick 1 GeV | |
189 | // | |
1af7144e | 190 | Float_t x = px[0]; |
191 | Float_t c[8] = { | |
192 | -2.13098e+00, 9.46552e+00, -5.06799e+00, 1.27260e+00, | |
193 | -1.83806e-01, 1.55853e-02, -7.23241e-04, 1.42105e-05 | |
05932df6 | 194 | }; |
1af7144e | 195 | |
3d905dd7 | 196 | Double_t y; |
36349df1 | 197 | if (x < 10.) { |
3d905dd7 | 198 | Int_t j; |
199 | y = c[j = 7]; | |
200 | while (j > 0) y = y * x +c[--j]; | |
201 | y = x * TMath::Exp(y); | |
202 | } else { | |
203 | y = 0.; | |
204 | } | |
1af7144e | 205 | return y; |
05932df6 | 206 | } |
17d28ba5 | 207 | |
208 | Double_t AliGenMUONlib::PtJpsiBPbPb( Double_t *px, Double_t */*dummy*/) | |
209 | { | |
210 | // J/Psi pT spectrum | |
211 | // B -> J/Psi X | |
212 | Double_t x0 = 4.0384; | |
213 | Double_t n = 3.0288; | |
214 | ||
215 | Double_t x = px[0]; | |
216 | Double_t y = x / TMath::Power((1. + (x/x0)*(x/x0)), n); | |
217 | ||
218 | return y; | |
219 | } | |
220 | ||
221 | ||
198bb1c7 | 222 | Double_t AliGenMUONlib::PtJpsiPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 223 | { |
224 | // J/Psi pT spectrum | |
225 | // | |
226 | // R. Vogt 2002 | |
227 | // pp 14 TeV | |
228 | // MRST HO | |
229 | // mc = 1.4 GeV, pt-kick 1 GeV | |
230 | // | |
231 | Float_t x = px[0]; | |
232 | Float_t c[4] = {8.47471e+00, -1.93567e+00, 1.50271e-01, -5.51212e-03}; | |
233 | ||
234 | Double_t y; | |
235 | if (x < 10.) { | |
236 | Int_t j; | |
237 | y = c[j = 3]; | |
238 | while (j > 0) y = y * x +c[--j]; | |
239 | y = x * TMath::Exp(y); | |
240 | } else { | |
241 | y = 0.; | |
242 | } | |
243 | return y; | |
244 | } | |
245 | ||
fe4da5cc | 246 | // |
247 | // y-distribution | |
248 | //____________________________________________________________ | |
198bb1c7 | 249 | Double_t AliGenMUONlib::YJpsi(Double_t *py, Double_t */*dummy*/) |
fe4da5cc | 250 | { |
d90f80fd | 251 | // J/psi y |
252 | const Double_t ky0 = 4.; | |
253 | const Double_t kb=1.; | |
fe4da5cc | 254 | Double_t yj; |
255 | Double_t y=TMath::Abs(*py); | |
256 | // | |
d90f80fd | 257 | if (y < ky0) |
258 | yj=kb; | |
fe4da5cc | 259 | else |
d90f80fd | 260 | yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); |
fe4da5cc | 261 | return yj; |
262 | } | |
05932df6 | 263 | |
a384decf | 264 | Double_t AliGenMUONlib::YJpsiFlat( Double_t */*py*/, Double_t */*dummy*/ ) |
4ca8d070 | 265 | { |
266 | return 1.; | |
267 | } | |
268 | ||
05932df6 | 269 | |
198bb1c7 | 270 | Double_t AliGenMUONlib::YJpsiPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 271 | { |
272 | ||
273 | // | |
274 | // J/Psi y | |
275 | // | |
276 | // | |
277 | // R. Vogt 2002 | |
278 | // PbPb 5.5 TeV | |
279 | // MRST HO | |
280 | // mc = 1.4 GeV, pt-kick 1 GeV | |
281 | // | |
1af7144e | 282 | Double_t c[5] = {-6.03425e+02, 4.98257e+02, -1.38794e+02, 1.62209e+01, -6.85955e-01}; |
283 | Double_t x = TMath::Abs(px[0]); | |
284 | Double_t y; | |
285 | ||
286 | if (x < 4.) { | |
287 | y = 31.754; | |
288 | } else if (x < 6) { | |
289 | Int_t j; | |
290 | y = c[j = 4]; | |
291 | while (j > 0) y = y * x + c[--j]; | |
292 | } else { | |
293 | y =0.; | |
294 | } | |
295 | ||
296 | return y; | |
05932df6 | 297 | } |
298 | ||
0e137c25 | 299 | Double_t AliGenMUONlib::YJpsiCDFscaled( Double_t *px, Double_t* dummy) |
300 | { | |
301 | // J/Psi y | |
302 | return AliGenMUONlib::YJpsiPbPb(px, dummy); | |
303 | } | |
304 | ||
305 | ||
198bb1c7 | 306 | Double_t AliGenMUONlib::YJpsiPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 307 | { |
308 | ||
309 | // | |
310 | // J/Psi y | |
311 | // | |
312 | // | |
313 | // R. Vogt 2002 | |
314 | // pp 14 TeV | |
315 | // MRST HO | |
316 | // mc = 1.4 GeV, pt-kick 1 GeV | |
317 | // | |
318 | ||
319 | Double_t c[5] = {1.38532e+00, 1.00596e+02, -3.46378e+01, 3.94172e+00, -1.48319e-01}; | |
320 | Double_t x = TMath::Abs(px[0]); | |
321 | Double_t y; | |
322 | ||
323 | if (x < 2.5) { | |
324 | y = 96.455 - 0.8483 * x * x; | |
325 | } else if (x < 7.9) { | |
326 | Int_t j; | |
327 | y = c[j = 4]; | |
328 | while (j > 0) y = y * x + c[--j]; | |
329 | } else { | |
330 | y =0.; | |
331 | } | |
332 | ||
333 | return y; | |
334 | } | |
335 | ||
17d28ba5 | 336 | Double_t AliGenMUONlib::YJpsiBPbPb( Double_t *px, Double_t */*dummy*/) |
337 | { | |
338 | ||
339 | // | |
340 | // J/Psi from B->J/Psi X | |
341 | // | |
342 | // | |
343 | ||
344 | ||
345 | Double_t c[7] = {7.37025e-02, 0., -2.94487e-03, 0., 6.07953e-06, 0., 5.39219e-07}; | |
346 | ||
347 | Double_t x = TMath::Abs(px[0]); | |
348 | Double_t y; | |
349 | ||
350 | if (x > 6.) { | |
351 | y = 0.; | |
352 | } else { | |
353 | Int_t j; | |
354 | y = c[j = 6]; | |
355 | while (j > 0) y = y * x + c[--j]; | |
356 | } | |
357 | ||
358 | return y; | |
359 | } | |
360 | ||
361 | ||
362 | ||
fe4da5cc | 363 | // particle composition |
364 | // | |
65fb704d | 365 | Int_t AliGenMUONlib::IpJpsi(TRandom *) |
fe4da5cc | 366 | { |
d90f80fd | 367 | // J/Psi composition |
88cb7938 | 368 | return 443; |
fe4da5cc | 369 | } |
88e5db43 | 370 | Int_t AliGenMUONlib::IpPsiP(TRandom *) |
371 | { | |
372 | // Psi prime composition | |
373 | return 100443; | |
374 | } | |
0ad09590 | 375 | Int_t AliGenMUONlib::IpJpsiFamily(TRandom *) |
376 | { | |
377 | // J/Psi composition | |
378 | Int_t ip; | |
379 | Float_t r = gRandom->Rndm(); | |
380 | if (r < 0.98) { | |
381 | ip = 443; | |
382 | } else { | |
383 | ip = 100443; | |
384 | } | |
385 | return ip; | |
386 | } | |
387 | ||
fe4da5cc | 388 | |
88e5db43 | 389 | |
fe4da5cc | 390 | // Upsilon |
391 | // | |
392 | // | |
393 | // pt-distribution | |
394 | //____________________________________________________________ | |
198bb1c7 | 395 | Double_t AliGenMUONlib::PtUpsilon( Double_t *px, Double_t */*dummy*/ ) |
fe4da5cc | 396 | { |
d90f80fd | 397 | // Upsilon pT |
398 | const Double_t kpt0 = 5.3; | |
399 | const Double_t kxn = 2.5; | |
fe4da5cc | 400 | Double_t x=*px; |
401 | // | |
d90f80fd | 402 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); |
403 | return x/TMath::Power(pass1,kxn); | |
fe4da5cc | 404 | } |
05932df6 | 405 | |
0e137c25 | 406 | Double_t AliGenMUONlib::PtUpsilonCDFscaled( Double_t *px, Double_t */*dummy*/ ) |
407 | { | |
408 | // Upsilon pT | |
48416d65 | 409 | const Double_t kpt0 = 7.753; |
410 | const Double_t kxn = 3.042; | |
0e137c25 | 411 | Double_t x=*px; |
412 | // | |
413 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); | |
414 | return x/TMath::Power(pass1,kxn); | |
415 | } | |
416 | ||
a384decf | 417 | Double_t AliGenMUONlib::PtUpsilonFlat( Double_t */*px*/, Double_t */*dummy*/ ) |
4ca8d070 | 418 | { |
419 | return 1.; | |
420 | } | |
421 | ||
198bb1c7 | 422 | Double_t AliGenMUONlib::PtUpsilonPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 423 | { |
424 | ||
425 | // | |
426 | // Upsilon pT | |
427 | // | |
428 | // | |
429 | // R. Vogt 2002 | |
430 | // PbPb 5.5 TeV | |
431 | // MRST HO | |
432 | // mc = 1.4 GeV, pt-kick 1 GeV | |
433 | // | |
1af7144e | 434 | Float_t x = px[0]; |
435 | Double_t c[8] = { | |
436 | -1.03488e+01, 1.28065e+01, -6.60500e+00, 1.66140e+00, | |
437 | -2.34293e-01, 1.86925e-02, -7.80708e-04, 1.30610e-05 | |
438 | }; | |
3d905dd7 | 439 | Double_t y; |
440 | if (x < 10.) { | |
441 | Int_t j; | |
442 | y = c[j = 7]; | |
443 | while (j > 0) y = y * x +c[--j]; | |
444 | y = x * TMath::Exp(y); | |
445 | } else { | |
446 | y = 0.; | |
447 | } | |
1af7144e | 448 | return y; |
05932df6 | 449 | } |
450 | ||
198bb1c7 | 451 | Double_t AliGenMUONlib::PtUpsilonPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 452 | { |
453 | ||
454 | // | |
455 | // Upsilon pT | |
456 | // | |
457 | // | |
458 | // R. Vogt 2002 | |
459 | // pp 14 TeV | |
460 | // MRST HO | |
461 | // mc = 1.4 GeV, pt-kick 1 GeV | |
462 | // | |
463 | Float_t x = px[0]; | |
464 | Double_t c[8] = {-7.93955e+00, 1.06306e+01, -5.21392e+00, 1.19703e+00, | |
465 | -1.45718e-01, 8.95151e-03, -2.04806e-04, -1.13053e-06}; | |
466 | ||
467 | Double_t y; | |
468 | if (x < 10.) { | |
469 | Int_t j; | |
470 | y = c[j = 7]; | |
471 | while (j > 0) y = y * x +c[--j]; | |
472 | y = x * TMath::Exp(y); | |
473 | } else { | |
474 | y = 0.; | |
475 | } | |
476 | return y; | |
477 | } | |
478 | ||
fe4da5cc | 479 | // |
480 | // y-distribution | |
481 | // | |
482 | //____________________________________________________________ | |
198bb1c7 | 483 | Double_t AliGenMUONlib::YUpsilon(Double_t *py, Double_t */*dummy*/) |
fe4da5cc | 484 | { |
d90f80fd | 485 | // Upsilon y |
486 | const Double_t ky0 = 3.; | |
487 | const Double_t kb=1.; | |
fe4da5cc | 488 | Double_t yu; |
489 | Double_t y=TMath::Abs(*py); | |
490 | // | |
d90f80fd | 491 | if (y < ky0) |
492 | yu=kb; | |
fe4da5cc | 493 | else |
d90f80fd | 494 | yu=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); |
fe4da5cc | 495 | return yu; |
496 | } | |
05932df6 | 497 | |
498 | ||
198bb1c7 | 499 | Double_t AliGenMUONlib::YUpsilonPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 500 | { |
501 | ||
502 | // | |
503 | // Upsilon y | |
504 | // | |
505 | // | |
506 | // R. Vogt 2002 | |
507 | // PbPb 5.5 TeV | |
508 | // MRST HO | |
509 | // mc = 1.4 GeV, pt-kick 1 GeV | |
510 | // | |
511 | ||
1af7144e | 512 | Double_t c[7] = {3.40036e-01, -3.98882e-07, -4.48398e-03, 8.46411e-08, -6.10854e-04, |
513 | -2.99753e-09, 1.28895e-05}; | |
514 | ||
515 | Double_t x = px[0]; | |
516 | if (TMath::Abs(x) > 5.55) return 0.; | |
517 | Int_t j; | |
518 | Double_t y = c[j = 6]; | |
519 | while (j > 0) y = y * x +c[--j]; | |
520 | return y; | |
05932df6 | 521 | } |
522 | ||
0e137c25 | 523 | Double_t AliGenMUONlib::YUpsilonCDFscaled( Double_t *px, Double_t *dummy) |
524 | { | |
525 | // Upsilon y | |
526 | return AliGenMUONlib::YUpsilonPbPb(px, dummy); | |
527 | ||
4ca8d070 | 528 | } |
a384decf | 529 | Double_t AliGenMUONlib::YUpsilonFlat( Double_t */*px*/, Double_t */*dummy*/) |
4ca8d070 | 530 | { |
531 | // Upsilon y | |
532 | return 1.; | |
533 | ||
0e137c25 | 534 | } |
535 | ||
198bb1c7 | 536 | Double_t AliGenMUONlib::YUpsilonPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 537 | { |
538 | ||
539 | // | |
540 | // Upsilon y | |
541 | // | |
542 | // | |
543 | // R. Vogt 2002 | |
544 | // p p 14. TeV | |
545 | // MRST HO | |
546 | // mc = 1.4 GeV, pt-kick 1 GeV | |
547 | // | |
548 | Double_t c[7] = {8.91936e-01, -6.46645e-07, -1.52774e-02, 4.28677e-08, -7.01517e-04, | |
549 | -6.20539e-10, 1.29943e-05}; | |
550 | ||
551 | Double_t x = px[0]; | |
552 | if (TMath::Abs(x) > 6.2) return 0.; | |
553 | Int_t j; | |
554 | Double_t y = c[j = 6]; | |
555 | while (j > 0) y = y * x +c[--j]; | |
556 | return y; | |
557 | } | |
558 | ||
fe4da5cc | 559 | // particle composition |
560 | // | |
65fb704d | 561 | Int_t AliGenMUONlib::IpUpsilon(TRandom *) |
fe4da5cc | 562 | { |
d90f80fd | 563 | // y composition |
88cb7938 | 564 | return 553; |
fe4da5cc | 565 | } |
88e5db43 | 566 | Int_t AliGenMUONlib::IpUpsilonP(TRandom *) |
567 | { | |
568 | // y composition | |
569 | return 100553; | |
570 | } | |
571 | Int_t AliGenMUONlib::IpUpsilonPP(TRandom *) | |
572 | { | |
573 | // y composition | |
574 | return 200553; | |
575 | } | |
0ad09590 | 576 | Int_t AliGenMUONlib::IpUpsilonFamily(TRandom *) |
577 | { | |
578 | // y composition | |
579 | Int_t ip; | |
580 | Float_t r = gRandom->Rndm(); | |
581 | ||
582 | if (r < 0.712) { | |
583 | ip = 553; | |
584 | } else if (r < 0.896) { | |
585 | ip = 100553; | |
586 | } else { | |
587 | ip = 200553; | |
588 | } | |
589 | return ip; | |
590 | } | |
fe4da5cc | 591 | |
88e5db43 | 592 | |
fe4da5cc | 593 | // |
594 | // Phi | |
595 | // | |
596 | // | |
597 | // pt-distribution (by scaling of pion distribution) | |
598 | //____________________________________________________________ | |
198bb1c7 | 599 | Double_t AliGenMUONlib::PtPhi( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 600 | { |
d90f80fd | 601 | // Phi pT |
fe4da5cc | 602 | return PtScal(*px,7); |
603 | } | |
604 | // y-distribution | |
198bb1c7 | 605 | Double_t AliGenMUONlib::YPhi( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 606 | { |
d90f80fd | 607 | // Phi y |
608 | Double_t *dum=0; | |
609 | return YJpsi(px,dum); | |
fe4da5cc | 610 | } |
611 | // particle composition | |
612 | // | |
65fb704d | 613 | Int_t AliGenMUONlib::IpPhi(TRandom *) |
fe4da5cc | 614 | { |
d90f80fd | 615 | // Phi composition |
89512a3b | 616 | return 333; |
617 | } | |
618 | ||
619 | // | |
620 | // omega | |
621 | // | |
622 | // | |
623 | // pt-distribution (by scaling of pion distribution) | |
624 | //____________________________________________________________ | |
198bb1c7 | 625 | Double_t AliGenMUONlib::PtOmega( Double_t *px, Double_t */*dummy*/) |
89512a3b | 626 | { |
627 | // Omega pT | |
628 | return PtScal(*px,5); | |
629 | } | |
630 | // y-distribution | |
198bb1c7 | 631 | Double_t AliGenMUONlib::YOmega( Double_t *px, Double_t */*dummy*/) |
89512a3b | 632 | { |
633 | // Omega y | |
634 | Double_t *dum=0; | |
635 | return YJpsi(px,dum); | |
636 | } | |
637 | // particle composition | |
638 | // | |
639 | Int_t AliGenMUONlib::IpOmega(TRandom *) | |
640 | { | |
641 | // Omega composition | |
642 | return 223; | |
643 | } | |
644 | ||
645 | ||
646 | // | |
647 | // Eta | |
648 | // | |
649 | // | |
650 | // pt-distribution (by scaling of pion distribution) | |
651 | //____________________________________________________________ | |
198bb1c7 | 652 | Double_t AliGenMUONlib::PtEta( Double_t *px, Double_t */*dummy*/) |
89512a3b | 653 | { |
654 | // Eta pT | |
655 | return PtScal(*px,3); | |
656 | } | |
657 | // y-distribution | |
198bb1c7 | 658 | Double_t AliGenMUONlib::YEta( Double_t *px, Double_t */*dummy*/) |
89512a3b | 659 | { |
660 | // Eta y | |
661 | Double_t *dum=0; | |
662 | return YJpsi(px,dum); | |
663 | } | |
664 | // particle composition | |
665 | // | |
666 | Int_t AliGenMUONlib::IpEta(TRandom *) | |
667 | { | |
668 | // Eta composition | |
669 | return 221; | |
fe4da5cc | 670 | } |
671 | ||
672 | // | |
673 | // Charm | |
674 | // | |
675 | // | |
676 | // pt-distribution | |
677 | //____________________________________________________________ | |
198bb1c7 | 678 | Double_t AliGenMUONlib::PtCharm( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 679 | { |
d90f80fd | 680 | // Charm pT |
bd0276a8 | 681 | const Double_t kpt0 = 2.25; |
682 | const Double_t kxn = 3.17; | |
2280e6af | 683 | |
fe4da5cc | 684 | Double_t x=*px; |
685 | // | |
bd0276a8 | 686 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); |
687 | return x/TMath::Power(pass1,kxn); | |
688 | } | |
689 | ||
690 | Double_t AliGenMUONlib::PtCharmCentral( Double_t *px, Double_t */*dummy*/) | |
691 | { | |
692 | // Charm pT | |
693 | const Double_t kpt0 = 2.12; | |
694 | const Double_t kxn = 2.78; | |
695 | ||
696 | Double_t x=*px; | |
697 | // | |
698 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); | |
d90f80fd | 699 | return x/TMath::Power(pass1,kxn); |
fe4da5cc | 700 | } |
701 | // y-distribution | |
198bb1c7 | 702 | Double_t AliGenMUONlib::YCharm( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 703 | { |
ec772ba2 | 704 | // Charm y :: Carrer & Dainese : ALICE-INT-2003-019 v.3 (hep-ph/0311225) |
705 | // Pythia tuned to reproduce the distribution given by the HVQMNR program based on NLO calculations (pQCD) | |
706 | // shadowing + kt broadening | |
707 | ||
708 | Double_t x=px[0]; | |
709 | Double_t c[2]={-2.42985e-03,-2.31001e-04}; | |
710 | Double_t y=1+(c[0]*TMath::Power(x,2))+(c[1]*TMath::Power(x,4)); | |
711 | Double_t ycharm; | |
712 | ||
713 | if (TMath::Abs(x)>8) { | |
714 | ycharm=0.; | |
715 | } | |
716 | else { | |
717 | ycharm=TMath::Power(y,3); | |
718 | } | |
719 | ||
720 | return ycharm; | |
fe4da5cc | 721 | } |
722 | ||
ec772ba2 | 723 | |
65fb704d | 724 | Int_t AliGenMUONlib::IpCharm(TRandom *ran) |
fe4da5cc | 725 | { |
d90f80fd | 726 | // Charm composition |
65fb704d | 727 | Float_t random; |
fe4da5cc | 728 | Int_t ip; |
729 | // 411,421,431,4122 | |
65fb704d | 730 | random = ran->Rndm(); |
ec772ba2 | 731 | // Taux de production Carrer & Dainese : ALICE-INT-2003-019 v.3 |
732 | // >>>>> cf. tab 4 p 11 | |
733 | ||
734 | if (random < 0.30) { | |
735 | ip=421; | |
736 | } else if (random < 0.60) { | |
737 | ip=-421; | |
738 | } else if (random < 0.70) { | |
739 | ip=411; | |
740 | } else if (random < 0.80) { | |
741 | ip=-411; | |
742 | } else if (random < 0.86) { | |
743 | ip=431; | |
744 | } else if (random < 0.92) { | |
745 | ip=-431; | |
746 | } else if (random < 0.96) { | |
747 | ip=4122; | |
fe4da5cc | 748 | } else { |
ec772ba2 | 749 | ip=-4122; |
fe4da5cc | 750 | } |
fe4da5cc | 751 | |
752 | return ip; | |
753 | } | |
754 | ||
fe4da5cc | 755 | // |
756 | // Beauty | |
757 | // | |
758 | // | |
759 | // pt-distribution | |
760 | //____________________________________________________________ | |
198bb1c7 | 761 | Double_t AliGenMUONlib::PtBeauty( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 762 | { |
d90f80fd | 763 | // Beauty pT |
bd0276a8 | 764 | const Double_t kpt0 = 6.53; |
765 | const Double_t kxn = 3.59; | |
766 | Double_t x=*px; | |
767 | // | |
768 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); | |
769 | return x/TMath::Power(pass1,kxn); | |
770 | } | |
771 | ||
772 | Double_t AliGenMUONlib::PtBeautyCentral( Double_t *px, Double_t */*dummy*/) | |
773 | { | |
774 | // Beauty pT | |
775 | const Double_t kpt0 = 6.14; | |
776 | const Double_t kxn = 2.93; | |
fe4da5cc | 777 | Double_t x=*px; |
778 | // | |
d90f80fd | 779 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); |
780 | return x/TMath::Power(pass1,kxn); | |
fe4da5cc | 781 | } |
782 | // y-distribution | |
198bb1c7 | 783 | Double_t AliGenMUONlib::YBeauty( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 784 | { |
ec772ba2 | 785 | // Beauty y :: Carrer & Dainese : ALICE-INT-2003-019 v.3 (hep-ph/0311225) |
786 | // Pythia tuned to reproduce the distribution given by the HVQMNR program based on NLO calculations (pQCD) | |
787 | // shadowing + kt broadening | |
788 | ||
789 | Double_t x=px[0]; | |
790 | Double_t c[2]={-1.27590e-02,-2.42731e-04}; | |
791 | Double_t y=1+c[0]*TMath::Power(x,2)+c[1]*TMath::Power(x,4); | |
792 | Double_t ybeauty; | |
793 | ||
794 | if (TMath::Abs(x)>6) { | |
795 | ybeauty=0.; | |
796 | } | |
797 | else { | |
798 | ybeauty=TMath::Power(y,3); | |
799 | } | |
800 | ||
801 | return ybeauty; | |
fe4da5cc | 802 | } |
803 | ||
ec772ba2 | 804 | |
65fb704d | 805 | Int_t AliGenMUONlib::IpBeauty(TRandom *ran) |
fe4da5cc | 806 | { |
d90f80fd | 807 | // Beauty Composition |
65fb704d | 808 | Float_t random; |
fe4da5cc | 809 | Int_t ip; |
ec772ba2 | 810 | random = ran->Rndm(); |
811 | ||
812 | // Taux de production Carrer & Dainese : ALICE-INT-2003-019 v.3 | |
813 | // >>>>> cf. tab 4 p 11 | |
814 | ||
815 | if (random < 0.20) { | |
816 | ip=511; | |
817 | } else if (random < 0.40) { | |
818 | ip=-511; | |
819 | } else if (random < 0.605) { | |
820 | ip=521; | |
821 | } else if (random < 0.81) { | |
822 | ip=-521; | |
823 | } else if (random < 0.87) { | |
824 | ip=531; | |
825 | } else if (random < 0.93) { | |
826 | ip=-531; | |
827 | } else if (random < 0.965) { | |
828 | ip=5122; | |
fe4da5cc | 829 | } else { |
ec772ba2 | 830 | ip=-5122; |
fe4da5cc | 831 | } |
fe4da5cc | 832 | |
ec772ba2 | 833 | return ip; |
fe4da5cc | 834 | } |
835 | ||
ec772ba2 | 836 | |
fe4da5cc | 837 | typedef Double_t (*GenFunc) (Double_t*, Double_t*); |
53904666 | 838 | GenFunc AliGenMUONlib::GetPt(Int_t param, const char* tname) const |
fe4da5cc | 839 | { |
d90f80fd | 840 | // Return pointer to pT parameterisation |
05932df6 | 841 | TString sname = TString(tname); |
fe4da5cc | 842 | GenFunc func; |
753690b0 | 843 | switch (param) |
fe4da5cc | 844 | { |
34f60c01 | 845 | case kPhi: |
fe4da5cc | 846 | func=PtPhi; |
847 | break; | |
89512a3b | 848 | case kOmega: |
849 | func=PtOmega; | |
850 | break; | |
851 | case kEta: | |
852 | func=PtEta; | |
853 | break; | |
0ad09590 | 854 | case kJpsiFamily: |
88e5db43 | 855 | case kPsiP: |
34f60c01 | 856 | case kJpsi: |
bb6e81ac | 857 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 858 | func=PtJpsiPbPb; |
bb6e81ac | 859 | } else if (sname == "Vogt pp") { |
860 | func=PtJpsiPP; | |
0e137c25 | 861 | } else if (sname == "CDF scaled") { |
862 | func=PtJpsiCDFscaled; | |
4ca8d070 | 863 | } else if (sname == "Flat") { |
864 | func=PtJpsiFlat; | |
05932df6 | 865 | } else { |
866 | func=PtJpsi; | |
867 | } | |
fe4da5cc | 868 | break; |
17d28ba5 | 869 | case kJpsiFromB: |
870 | func = PtJpsiBPbPb; | |
871 | break; | |
0ad09590 | 872 | case kUpsilonFamily: |
88e5db43 | 873 | case kUpsilonP: |
874 | case kUpsilonPP: | |
34f60c01 | 875 | case kUpsilon: |
bb6e81ac | 876 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 877 | func=PtUpsilonPbPb; |
bb6e81ac | 878 | } else if (sname == "Vogt pp") { |
879 | func=PtUpsilonPP; | |
0e137c25 | 880 | } else if (sname == "CDF scaled") { |
881 | func=PtUpsilonCDFscaled; | |
4ca8d070 | 882 | } else if (sname == "Flat") { |
883 | func=PtUpsilonFlat; | |
05932df6 | 884 | } else { |
885 | func=PtUpsilon; | |
886 | } | |
0ad09590 | 887 | break; |
34f60c01 | 888 | case kCharm: |
bd0276a8 | 889 | if (sname == "central") { |
890 | func=PtCharmCentral; | |
891 | } else { | |
892 | func=PtCharm; | |
893 | } | |
fe4da5cc | 894 | break; |
34f60c01 | 895 | case kBeauty: |
bd0276a8 | 896 | if (sname == "central") { |
897 | func=PtBeautyCentral; | |
898 | } else { | |
899 | func=PtBeauty; | |
900 | } | |
fe4da5cc | 901 | break; |
34f60c01 | 902 | case kPion: |
753690b0 | 903 | func=PtPion; |
904 | break; | |
34f60c01 | 905 | case kKaon: |
753690b0 | 906 | func=PtKaon; |
907 | break; | |
119b35c7 | 908 | default: |
909 | func=0; | |
910 | printf("<AliGenMUONlib::GetPt> unknown parametrisation\n"); | |
fe4da5cc | 911 | } |
912 | return func; | |
913 | } | |
914 | ||
53904666 | 915 | GenFunc AliGenMUONlib::GetY(Int_t param, const char* tname) const |
fe4da5cc | 916 | { |
ac3faee4 | 917 | // |
918 | // Return pointer to y- parameterisation | |
919 | // | |
05932df6 | 920 | TString sname = TString(tname); |
fe4da5cc | 921 | GenFunc func; |
753690b0 | 922 | switch (param) |
fe4da5cc | 923 | { |
34f60c01 | 924 | case kPhi: |
fe4da5cc | 925 | func=YPhi; |
926 | break; | |
89512a3b | 927 | case kEta: |
928 | func=YEta; | |
929 | break; | |
930 | case kOmega: | |
931 | func=YOmega; | |
932 | break; | |
0ad09590 | 933 | case kJpsiFamily: |
88e5db43 | 934 | case kPsiP: |
34f60c01 | 935 | case kJpsi: |
bb6e81ac | 936 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 937 | func=YJpsiPbPb; |
bb6e81ac | 938 | } else if (sname == "Vogt pp"){ |
939 | func=YJpsiPP; | |
0e137c25 | 940 | } else if (sname == "CDF scaled") { |
941 | func=YJpsiCDFscaled; | |
4ca8d070 | 942 | } else if (sname == "Flat") { |
943 | func=YJpsiFlat; | |
05932df6 | 944 | } else { |
945 | func=YJpsi; | |
946 | } | |
17d28ba5 | 947 | break; |
948 | case kJpsiFromB: | |
949 | func = YJpsiBPbPb; | |
fe4da5cc | 950 | break; |
0ad09590 | 951 | case kUpsilonFamily: |
88e5db43 | 952 | case kUpsilonP: |
953 | case kUpsilonPP: | |
34f60c01 | 954 | case kUpsilon: |
bb6e81ac | 955 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 956 | func=YUpsilonPbPb; |
bb6e81ac | 957 | } else if (sname == "Vogt pp") { |
958 | func = YUpsilonPP; | |
0e137c25 | 959 | } else if (sname == "CDF scaled") { |
960 | func=YUpsilonCDFscaled; | |
4ca8d070 | 961 | } else if (sname == "Flat") { |
962 | func=YUpsilonFlat; | |
05932df6 | 963 | } else { |
964 | func=YUpsilon; | |
965 | } | |
fe4da5cc | 966 | break; |
34f60c01 | 967 | case kCharm: |
fe4da5cc | 968 | func=YCharm; |
969 | break; | |
34f60c01 | 970 | case kBeauty: |
fe4da5cc | 971 | func=YBeauty; |
972 | break; | |
34f60c01 | 973 | case kPion: |
753690b0 | 974 | func=YPion; |
975 | break; | |
34f60c01 | 976 | case kKaon: |
753690b0 | 977 | func=YKaon; |
978 | break; | |
119b35c7 | 979 | default: |
980 | func=0; | |
981 | printf("<AliGenMUONlib::GetY> unknown parametrisation\n"); | |
fe4da5cc | 982 | } |
983 | return func; | |
984 | } | |
65fb704d | 985 | typedef Int_t (*GenFuncIp) (TRandom *); |
198bb1c7 | 986 | GenFuncIp AliGenMUONlib::GetIp(Int_t param, const char* /*tname*/) const |
fe4da5cc | 987 | { |
d90f80fd | 988 | // Return pointer to particle type parameterisation |
fe4da5cc | 989 | GenFuncIp func; |
753690b0 | 990 | switch (param) |
fe4da5cc | 991 | { |
34f60c01 | 992 | case kPhi: |
fe4da5cc | 993 | func=IpPhi; |
994 | break; | |
89512a3b | 995 | case kEta: |
996 | func=IpEta; | |
997 | break; | |
998 | case kOmega: | |
999 | func=IpOmega; | |
1000 | break; | |
0ad09590 | 1001 | case kJpsiFamily: |
1002 | func=IpJpsiFamily; | |
1003 | break; | |
88e5db43 | 1004 | case kPsiP: |
1005 | func=IpPsiP; | |
1006 | break; | |
34f60c01 | 1007 | case kJpsi: |
17d28ba5 | 1008 | case kJpsiFromB: |
fe4da5cc | 1009 | func=IpJpsi; |
1010 | break; | |
34f60c01 | 1011 | case kUpsilon: |
fe4da5cc | 1012 | func=IpUpsilon; |
1013 | break; | |
0ad09590 | 1014 | case kUpsilonFamily: |
1015 | func=IpUpsilonFamily; | |
1016 | break; | |
88e5db43 | 1017 | case kUpsilonP: |
1018 | func=IpUpsilonP; | |
1019 | break; | |
1020 | case kUpsilonPP: | |
1021 | func=IpUpsilonPP; | |
1022 | break; | |
34f60c01 | 1023 | case kCharm: |
fe4da5cc | 1024 | func=IpCharm; |
1025 | break; | |
34f60c01 | 1026 | case kBeauty: |
fe4da5cc | 1027 | func=IpBeauty; |
1028 | break; | |
34f60c01 | 1029 | case kPion: |
753690b0 | 1030 | func=IpPion; |
1031 | break; | |
34f60c01 | 1032 | case kKaon: |
753690b0 | 1033 | func=IpKaon; |
1034 | break; | |
119b35c7 | 1035 | default: |
1036 | func=0; | |
1037 | printf("<AliGenMUONlib::GetIp> unknown parametrisation\n"); | |
fe4da5cc | 1038 | } |
1039 | return func; | |
1040 | } | |
1041 | ||
1042 | ||
753690b0 | 1043 | |
05932df6 | 1044 | Float_t AliGenMUONlib::Interpolate(Float_t x, Float_t* y, Float_t x0, |
1045 | Float_t dx, | |
1046 | Int_t n, Int_t no) | |
1047 | { | |
1048 | // | |
1049 | // Neville's alorithm for interpolation | |
1050 | // | |
1051 | // x: x-value | |
1052 | // y: Input array | |
1053 | // x0: minimum x | |
1054 | // dx: step size | |
1055 | // n: number of data points | |
1056 | // no: order of polynom | |
1057 | // | |
1058 | Float_t* c = new Float_t[n]; | |
1059 | Float_t* d = new Float_t[n]; | |
1060 | Int_t m, i; | |
1061 | for (i = 0; i < n; i++) { | |
1062 | c[i] = y[i]; | |
1063 | d[i] = y[i]; | |
1064 | } | |
1065 | ||
1066 | Int_t ns = int((x - x0)/dx); | |
1067 | ||
1068 | Float_t y1 = y[ns]; | |
1069 | ns--; | |
1070 | for (m = 0; m < no; m++) { | |
1071 | for (i = 0; i < n-m; i++) { | |
1072 | Float_t ho = x0 + Float_t(i) * dx - x; | |
1073 | Float_t hp = x0 + Float_t(i+m+1) * dx - x; | |
1074 | Float_t w = c[i+1] - d[i]; | |
1075 | Float_t den = ho-hp; | |
1076 | den = w/den; | |
1077 | d[i] = hp * den; | |
1078 | c[i] = ho * den; | |
1079 | } | |
1080 | Float_t dy; | |
1081 | ||
1082 | if (2*ns < (n-m-1)) { | |
1083 | dy = c[ns+1]; | |
1084 | } else { | |
1085 | dy = d[ns--]; | |
1086 | } | |
1087 | y1 += dy;} | |
1088 | delete[] c; | |
1089 | delete[] d; | |
1090 | ||
1091 | return y1; | |
1092 | } | |
1093 | ||
753690b0 | 1094 |