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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 | |
198bb1c7 | 165 | Double_t AliGenMUONlib::PtJpsiPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 166 | { |
1af7144e | 167 | // J/Psi pT spectrum |
05932df6 | 168 | // |
169 | // R. Vogt 2002 | |
170 | // PbPb 5.5 TeV | |
171 | // MRST HO | |
172 | // mc = 1.4 GeV, pt-kick 1 GeV | |
173 | // | |
1af7144e | 174 | Float_t x = px[0]; |
175 | Float_t c[8] = { | |
176 | -2.13098e+00, 9.46552e+00, -5.06799e+00, 1.27260e+00, | |
177 | -1.83806e-01, 1.55853e-02, -7.23241e-04, 1.42105e-05 | |
05932df6 | 178 | }; |
1af7144e | 179 | |
3d905dd7 | 180 | Double_t y; |
181 | if (x < 10.) { | |
182 | Int_t j; | |
183 | y = c[j = 7]; | |
184 | while (j > 0) y = y * x +c[--j]; | |
185 | y = x * TMath::Exp(y); | |
186 | } else { | |
187 | y = 0.; | |
188 | } | |
1af7144e | 189 | return y; |
05932df6 | 190 | } |
17d28ba5 | 191 | |
192 | Double_t AliGenMUONlib::PtJpsiBPbPb( Double_t *px, Double_t */*dummy*/) | |
193 | { | |
194 | // J/Psi pT spectrum | |
195 | // B -> J/Psi X | |
196 | Double_t x0 = 4.0384; | |
197 | Double_t n = 3.0288; | |
198 | ||
199 | Double_t x = px[0]; | |
200 | Double_t y = x / TMath::Power((1. + (x/x0)*(x/x0)), n); | |
201 | ||
202 | return y; | |
203 | } | |
204 | ||
205 | ||
198bb1c7 | 206 | Double_t AliGenMUONlib::PtJpsiPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 207 | { |
208 | // J/Psi pT spectrum | |
209 | // | |
210 | // R. Vogt 2002 | |
211 | // pp 14 TeV | |
212 | // MRST HO | |
213 | // mc = 1.4 GeV, pt-kick 1 GeV | |
214 | // | |
215 | Float_t x = px[0]; | |
216 | Float_t c[4] = {8.47471e+00, -1.93567e+00, 1.50271e-01, -5.51212e-03}; | |
217 | ||
218 | Double_t y; | |
219 | if (x < 10.) { | |
220 | Int_t j; | |
221 | y = c[j = 3]; | |
222 | while (j > 0) y = y * x +c[--j]; | |
223 | y = x * TMath::Exp(y); | |
224 | } else { | |
225 | y = 0.; | |
226 | } | |
227 | return y; | |
228 | } | |
229 | ||
fe4da5cc | 230 | // |
231 | // y-distribution | |
232 | //____________________________________________________________ | |
198bb1c7 | 233 | Double_t AliGenMUONlib::YJpsi(Double_t *py, Double_t */*dummy*/) |
fe4da5cc | 234 | { |
d90f80fd | 235 | // J/psi y |
236 | const Double_t ky0 = 4.; | |
237 | const Double_t kb=1.; | |
fe4da5cc | 238 | Double_t yj; |
239 | Double_t y=TMath::Abs(*py); | |
240 | // | |
d90f80fd | 241 | if (y < ky0) |
242 | yj=kb; | |
fe4da5cc | 243 | else |
d90f80fd | 244 | yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); |
fe4da5cc | 245 | return yj; |
246 | } | |
05932df6 | 247 | |
248 | ||
198bb1c7 | 249 | Double_t AliGenMUONlib::YJpsiPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 250 | { |
251 | ||
252 | // | |
253 | // J/Psi y | |
254 | // | |
255 | // | |
256 | // R. Vogt 2002 | |
257 | // PbPb 5.5 TeV | |
258 | // MRST HO | |
259 | // mc = 1.4 GeV, pt-kick 1 GeV | |
260 | // | |
1af7144e | 261 | Double_t c[5] = {-6.03425e+02, 4.98257e+02, -1.38794e+02, 1.62209e+01, -6.85955e-01}; |
262 | Double_t x = TMath::Abs(px[0]); | |
263 | Double_t y; | |
264 | ||
265 | if (x < 4.) { | |
266 | y = 31.754; | |
267 | } else if (x < 6) { | |
268 | Int_t j; | |
269 | y = c[j = 4]; | |
270 | while (j > 0) y = y * x + c[--j]; | |
271 | } else { | |
272 | y =0.; | |
273 | } | |
274 | ||
275 | return y; | |
05932df6 | 276 | } |
277 | ||
198bb1c7 | 278 | Double_t AliGenMUONlib::YJpsiPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 279 | { |
280 | ||
281 | // | |
282 | // J/Psi y | |
283 | // | |
284 | // | |
285 | // R. Vogt 2002 | |
286 | // pp 14 TeV | |
287 | // MRST HO | |
288 | // mc = 1.4 GeV, pt-kick 1 GeV | |
289 | // | |
290 | ||
291 | Double_t c[5] = {1.38532e+00, 1.00596e+02, -3.46378e+01, 3.94172e+00, -1.48319e-01}; | |
292 | Double_t x = TMath::Abs(px[0]); | |
293 | Double_t y; | |
294 | ||
295 | if (x < 2.5) { | |
296 | y = 96.455 - 0.8483 * x * x; | |
297 | } else if (x < 7.9) { | |
298 | Int_t j; | |
299 | y = c[j = 4]; | |
300 | while (j > 0) y = y * x + c[--j]; | |
301 | } else { | |
302 | y =0.; | |
303 | } | |
304 | ||
305 | return y; | |
306 | } | |
307 | ||
17d28ba5 | 308 | Double_t AliGenMUONlib::YJpsiBPbPb( Double_t *px, Double_t */*dummy*/) |
309 | { | |
310 | ||
311 | // | |
312 | // J/Psi from B->J/Psi X | |
313 | // | |
314 | // | |
315 | ||
316 | ||
317 | Double_t c[7] = {7.37025e-02, 0., -2.94487e-03, 0., 6.07953e-06, 0., 5.39219e-07}; | |
318 | ||
319 | Double_t x = TMath::Abs(px[0]); | |
320 | Double_t y; | |
321 | ||
322 | if (x > 6.) { | |
323 | y = 0.; | |
324 | } else { | |
325 | Int_t j; | |
326 | y = c[j = 6]; | |
327 | while (j > 0) y = y * x + c[--j]; | |
328 | } | |
329 | ||
330 | return y; | |
331 | } | |
332 | ||
333 | ||
334 | ||
fe4da5cc | 335 | // particle composition |
336 | // | |
65fb704d | 337 | Int_t AliGenMUONlib::IpJpsi(TRandom *) |
fe4da5cc | 338 | { |
d90f80fd | 339 | // J/Psi composition |
88cb7938 | 340 | return 443; |
fe4da5cc | 341 | } |
342 | ||
343 | // Upsilon | |
344 | // | |
345 | // | |
346 | // pt-distribution | |
347 | //____________________________________________________________ | |
198bb1c7 | 348 | Double_t AliGenMUONlib::PtUpsilon( Double_t *px, Double_t */*dummy*/ ) |
fe4da5cc | 349 | { |
d90f80fd | 350 | // Upsilon pT |
351 | const Double_t kpt0 = 5.3; | |
352 | const Double_t kxn = 2.5; | |
fe4da5cc | 353 | Double_t x=*px; |
354 | // | |
d90f80fd | 355 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); |
356 | return x/TMath::Power(pass1,kxn); | |
fe4da5cc | 357 | } |
05932df6 | 358 | |
198bb1c7 | 359 | Double_t AliGenMUONlib::PtUpsilonPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 360 | { |
361 | ||
362 | // | |
363 | // Upsilon pT | |
364 | // | |
365 | // | |
366 | // R. Vogt 2002 | |
367 | // PbPb 5.5 TeV | |
368 | // MRST HO | |
369 | // mc = 1.4 GeV, pt-kick 1 GeV | |
370 | // | |
1af7144e | 371 | Float_t x = px[0]; |
372 | Double_t c[8] = { | |
373 | -1.03488e+01, 1.28065e+01, -6.60500e+00, 1.66140e+00, | |
374 | -2.34293e-01, 1.86925e-02, -7.80708e-04, 1.30610e-05 | |
375 | }; | |
3d905dd7 | 376 | Double_t y; |
377 | if (x < 10.) { | |
378 | Int_t j; | |
379 | y = c[j = 7]; | |
380 | while (j > 0) y = y * x +c[--j]; | |
381 | y = x * TMath::Exp(y); | |
382 | } else { | |
383 | y = 0.; | |
384 | } | |
1af7144e | 385 | return y; |
05932df6 | 386 | } |
387 | ||
198bb1c7 | 388 | Double_t AliGenMUONlib::PtUpsilonPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 389 | { |
390 | ||
391 | // | |
392 | // Upsilon pT | |
393 | // | |
394 | // | |
395 | // R. Vogt 2002 | |
396 | // pp 14 TeV | |
397 | // MRST HO | |
398 | // mc = 1.4 GeV, pt-kick 1 GeV | |
399 | // | |
400 | Float_t x = px[0]; | |
401 | Double_t c[8] = {-7.93955e+00, 1.06306e+01, -5.21392e+00, 1.19703e+00, | |
402 | -1.45718e-01, 8.95151e-03, -2.04806e-04, -1.13053e-06}; | |
403 | ||
404 | Double_t y; | |
405 | if (x < 10.) { | |
406 | Int_t j; | |
407 | y = c[j = 7]; | |
408 | while (j > 0) y = y * x +c[--j]; | |
409 | y = x * TMath::Exp(y); | |
410 | } else { | |
411 | y = 0.; | |
412 | } | |
413 | return y; | |
414 | } | |
415 | ||
fe4da5cc | 416 | // |
417 | // y-distribution | |
418 | // | |
419 | //____________________________________________________________ | |
198bb1c7 | 420 | Double_t AliGenMUONlib::YUpsilon(Double_t *py, Double_t */*dummy*/) |
fe4da5cc | 421 | { |
d90f80fd | 422 | // Upsilon y |
423 | const Double_t ky0 = 3.; | |
424 | const Double_t kb=1.; | |
fe4da5cc | 425 | Double_t yu; |
426 | Double_t y=TMath::Abs(*py); | |
427 | // | |
d90f80fd | 428 | if (y < ky0) |
429 | yu=kb; | |
fe4da5cc | 430 | else |
d90f80fd | 431 | yu=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2); |
fe4da5cc | 432 | return yu; |
433 | } | |
05932df6 | 434 | |
435 | ||
198bb1c7 | 436 | Double_t AliGenMUONlib::YUpsilonPbPb( Double_t *px, Double_t */*dummy*/) |
05932df6 | 437 | { |
438 | ||
439 | // | |
440 | // Upsilon y | |
441 | // | |
442 | // | |
443 | // R. Vogt 2002 | |
444 | // PbPb 5.5 TeV | |
445 | // MRST HO | |
446 | // mc = 1.4 GeV, pt-kick 1 GeV | |
447 | // | |
448 | ||
1af7144e | 449 | Double_t c[7] = {3.40036e-01, -3.98882e-07, -4.48398e-03, 8.46411e-08, -6.10854e-04, |
450 | -2.99753e-09, 1.28895e-05}; | |
451 | ||
452 | Double_t x = px[0]; | |
453 | if (TMath::Abs(x) > 5.55) return 0.; | |
454 | Int_t j; | |
455 | Double_t y = c[j = 6]; | |
456 | while (j > 0) y = y * x +c[--j]; | |
457 | return y; | |
05932df6 | 458 | } |
459 | ||
198bb1c7 | 460 | Double_t AliGenMUONlib::YUpsilonPP( Double_t *px, Double_t */*dummy*/) |
bb6e81ac | 461 | { |
462 | ||
463 | // | |
464 | // Upsilon y | |
465 | // | |
466 | // | |
467 | // R. Vogt 2002 | |
468 | // p p 14. TeV | |
469 | // MRST HO | |
470 | // mc = 1.4 GeV, pt-kick 1 GeV | |
471 | // | |
472 | Double_t c[7] = {8.91936e-01, -6.46645e-07, -1.52774e-02, 4.28677e-08, -7.01517e-04, | |
473 | -6.20539e-10, 1.29943e-05}; | |
474 | ||
475 | Double_t x = px[0]; | |
476 | if (TMath::Abs(x) > 6.2) return 0.; | |
477 | Int_t j; | |
478 | Double_t y = c[j = 6]; | |
479 | while (j > 0) y = y * x +c[--j]; | |
480 | return y; | |
481 | } | |
482 | ||
fe4da5cc | 483 | // particle composition |
484 | // | |
65fb704d | 485 | Int_t AliGenMUONlib::IpUpsilon(TRandom *) |
fe4da5cc | 486 | { |
d90f80fd | 487 | // y composition |
88cb7938 | 488 | return 553; |
fe4da5cc | 489 | } |
490 | ||
491 | // | |
492 | // Phi | |
493 | // | |
494 | // | |
495 | // pt-distribution (by scaling of pion distribution) | |
496 | //____________________________________________________________ | |
198bb1c7 | 497 | Double_t AliGenMUONlib::PtPhi( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 498 | { |
d90f80fd | 499 | // Phi pT |
fe4da5cc | 500 | return PtScal(*px,7); |
501 | } | |
502 | // y-distribution | |
198bb1c7 | 503 | Double_t AliGenMUONlib::YPhi( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 504 | { |
d90f80fd | 505 | // Phi y |
506 | Double_t *dum=0; | |
507 | return YJpsi(px,dum); | |
fe4da5cc | 508 | } |
509 | // particle composition | |
510 | // | |
65fb704d | 511 | Int_t AliGenMUONlib::IpPhi(TRandom *) |
fe4da5cc | 512 | { |
d90f80fd | 513 | // Phi composition |
89512a3b | 514 | return 333; |
515 | } | |
516 | ||
517 | // | |
518 | // omega | |
519 | // | |
520 | // | |
521 | // pt-distribution (by scaling of pion distribution) | |
522 | //____________________________________________________________ | |
198bb1c7 | 523 | Double_t AliGenMUONlib::PtOmega( Double_t *px, Double_t */*dummy*/) |
89512a3b | 524 | { |
525 | // Omega pT | |
526 | return PtScal(*px,5); | |
527 | } | |
528 | // y-distribution | |
198bb1c7 | 529 | Double_t AliGenMUONlib::YOmega( Double_t *px, Double_t */*dummy*/) |
89512a3b | 530 | { |
531 | // Omega y | |
532 | Double_t *dum=0; | |
533 | return YJpsi(px,dum); | |
534 | } | |
535 | // particle composition | |
536 | // | |
537 | Int_t AliGenMUONlib::IpOmega(TRandom *) | |
538 | { | |
539 | // Omega composition | |
540 | return 223; | |
541 | } | |
542 | ||
543 | ||
544 | // | |
545 | // Eta | |
546 | // | |
547 | // | |
548 | // pt-distribution (by scaling of pion distribution) | |
549 | //____________________________________________________________ | |
198bb1c7 | 550 | Double_t AliGenMUONlib::PtEta( Double_t *px, Double_t */*dummy*/) |
89512a3b | 551 | { |
552 | // Eta pT | |
553 | return PtScal(*px,3); | |
554 | } | |
555 | // y-distribution | |
198bb1c7 | 556 | Double_t AliGenMUONlib::YEta( Double_t *px, Double_t */*dummy*/) |
89512a3b | 557 | { |
558 | // Eta y | |
559 | Double_t *dum=0; | |
560 | return YJpsi(px,dum); | |
561 | } | |
562 | // particle composition | |
563 | // | |
564 | Int_t AliGenMUONlib::IpEta(TRandom *) | |
565 | { | |
566 | // Eta composition | |
567 | return 221; | |
fe4da5cc | 568 | } |
569 | ||
570 | // | |
571 | // Charm | |
572 | // | |
573 | // | |
574 | // pt-distribution | |
575 | //____________________________________________________________ | |
198bb1c7 | 576 | Double_t AliGenMUONlib::PtCharm( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 577 | { |
d90f80fd | 578 | // Charm pT |
579 | const Double_t kpt0 = 4.08; | |
580 | const Double_t kxn = 9.40; | |
2280e6af | 581 | |
fe4da5cc | 582 | Double_t x=*px; |
583 | // | |
2280e6af | 584 | Double_t pass1 = 1.+(x/kpt0); |
d90f80fd | 585 | return x/TMath::Power(pass1,kxn); |
fe4da5cc | 586 | } |
587 | // y-distribution | |
198bb1c7 | 588 | Double_t AliGenMUONlib::YCharm( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 589 | { |
d90f80fd | 590 | // Charm y |
591 | Double_t *dum=0; | |
592 | return YJpsi(px,dum); | |
fe4da5cc | 593 | } |
594 | ||
65fb704d | 595 | Int_t AliGenMUONlib::IpCharm(TRandom *ran) |
fe4da5cc | 596 | { |
d90f80fd | 597 | // Charm composition |
65fb704d | 598 | Float_t random; |
fe4da5cc | 599 | Int_t ip; |
600 | // 411,421,431,4122 | |
65fb704d | 601 | random = ran->Rndm(); |
602 | if (random < 0.5) { | |
fe4da5cc | 603 | ip=411; |
65fb704d | 604 | } else if (random < 0.75) { |
fe4da5cc | 605 | ip=421; |
65fb704d | 606 | } else if (random < 0.90) { |
fe4da5cc | 607 | ip=431; |
608 | } else { | |
609 | ip=4122; | |
610 | } | |
65fb704d | 611 | if (ran->Rndm() < 0.5) {ip=-ip;} |
fe4da5cc | 612 | |
613 | return ip; | |
614 | } | |
615 | ||
616 | ||
617 | // | |
618 | // Beauty | |
619 | // | |
620 | // | |
621 | // pt-distribution | |
622 | //____________________________________________________________ | |
198bb1c7 | 623 | Double_t AliGenMUONlib::PtBeauty( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 624 | { |
d90f80fd | 625 | // Beauty pT |
626 | const Double_t kpt0 = 4.; | |
627 | const Double_t kxn = 3.6; | |
fe4da5cc | 628 | Double_t x=*px; |
629 | // | |
d90f80fd | 630 | Double_t pass1 = 1.+(x/kpt0)*(x/kpt0); |
631 | return x/TMath::Power(pass1,kxn); | |
fe4da5cc | 632 | } |
633 | // y-distribution | |
198bb1c7 | 634 | Double_t AliGenMUONlib::YBeauty( Double_t *px, Double_t */*dummy*/) |
fe4da5cc | 635 | { |
d90f80fd | 636 | // Beauty y |
637 | Double_t *dum=0; | |
638 | return YJpsi(px,dum); | |
fe4da5cc | 639 | } |
640 | ||
65fb704d | 641 | Int_t AliGenMUONlib::IpBeauty(TRandom *ran) |
fe4da5cc | 642 | { |
d90f80fd | 643 | // Beauty Composition |
65fb704d | 644 | Float_t random; |
fe4da5cc | 645 | Int_t ip; |
65fb704d | 646 | random = ran->Rndm(); |
647 | if (random < 0.5) { | |
fe4da5cc | 648 | ip=511; |
65fb704d | 649 | } else if (random < 0.75) { |
fe4da5cc | 650 | ip=521; |
65fb704d | 651 | } else if (random < 0.90) { |
fe4da5cc | 652 | ip=531; |
653 | } else { | |
654 | ip=5122; | |
655 | } | |
65fb704d | 656 | if (ran->Rndm() < 0.5) {ip=-ip;} |
fe4da5cc | 657 | |
658 | return ip; | |
659 | } | |
660 | ||
661 | typedef Double_t (*GenFunc) (Double_t*, Double_t*); | |
53904666 | 662 | GenFunc AliGenMUONlib::GetPt(Int_t param, const char* tname) const |
fe4da5cc | 663 | { |
d90f80fd | 664 | // Return pointer to pT parameterisation |
05932df6 | 665 | TString sname = TString(tname); |
fe4da5cc | 666 | GenFunc func; |
753690b0 | 667 | switch (param) |
fe4da5cc | 668 | { |
34f60c01 | 669 | case kPhi: |
fe4da5cc | 670 | func=PtPhi; |
671 | break; | |
89512a3b | 672 | case kOmega: |
673 | func=PtOmega; | |
674 | break; | |
675 | case kEta: | |
676 | func=PtEta; | |
677 | break; | |
34f60c01 | 678 | case kJpsi: |
bb6e81ac | 679 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 680 | func=PtJpsiPbPb; |
bb6e81ac | 681 | } else if (sname == "Vogt pp") { |
682 | func=PtJpsiPP; | |
05932df6 | 683 | } else { |
684 | func=PtJpsi; | |
685 | } | |
fe4da5cc | 686 | break; |
17d28ba5 | 687 | case kJpsiFromB: |
688 | func = PtJpsiBPbPb; | |
689 | break; | |
34f60c01 | 690 | case kUpsilon: |
bb6e81ac | 691 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 692 | func=PtUpsilonPbPb; |
bb6e81ac | 693 | } else if (sname == "Vogt pp") { |
694 | func=PtUpsilonPP; | |
05932df6 | 695 | } else { |
696 | func=PtUpsilon; | |
697 | } | |
fe4da5cc | 698 | break; |
34f60c01 | 699 | case kCharm: |
fe4da5cc | 700 | func=PtCharm; |
701 | break; | |
34f60c01 | 702 | case kBeauty: |
fe4da5cc | 703 | func=PtBeauty; |
704 | break; | |
34f60c01 | 705 | case kPion: |
753690b0 | 706 | func=PtPion; |
707 | break; | |
34f60c01 | 708 | case kKaon: |
753690b0 | 709 | func=PtKaon; |
710 | break; | |
119b35c7 | 711 | default: |
712 | func=0; | |
713 | printf("<AliGenMUONlib::GetPt> unknown parametrisation\n"); | |
fe4da5cc | 714 | } |
715 | return func; | |
716 | } | |
717 | ||
53904666 | 718 | GenFunc AliGenMUONlib::GetY(Int_t param, const char* tname) const |
fe4da5cc | 719 | { |
05932df6 | 720 | TString sname = TString(tname); |
721 | ||
d90f80fd | 722 | // Return pointer to y- parameterisation |
fe4da5cc | 723 | GenFunc func; |
753690b0 | 724 | switch (param) |
fe4da5cc | 725 | { |
34f60c01 | 726 | case kPhi: |
fe4da5cc | 727 | func=YPhi; |
728 | break; | |
89512a3b | 729 | case kEta: |
730 | func=YEta; | |
731 | break; | |
732 | case kOmega: | |
733 | func=YOmega; | |
734 | break; | |
34f60c01 | 735 | case kJpsi: |
bb6e81ac | 736 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 737 | func=YJpsiPbPb; |
bb6e81ac | 738 | } else if (sname == "Vogt pp"){ |
739 | func=YJpsiPP; | |
05932df6 | 740 | } else { |
741 | func=YJpsi; | |
742 | } | |
bb6e81ac | 743 | |
17d28ba5 | 744 | break; |
745 | case kJpsiFromB: | |
746 | func = YJpsiBPbPb; | |
fe4da5cc | 747 | break; |
34f60c01 | 748 | case kUpsilon: |
bb6e81ac | 749 | if (sname == "Vogt" || sname == "Vogt PbPb") { |
05932df6 | 750 | func=YUpsilonPbPb; |
bb6e81ac | 751 | } else if (sname == "Vogt pp") { |
752 | func = YUpsilonPP; | |
05932df6 | 753 | } else { |
754 | func=YUpsilon; | |
755 | } | |
fe4da5cc | 756 | break; |
34f60c01 | 757 | case kCharm: |
fe4da5cc | 758 | func=YCharm; |
759 | break; | |
34f60c01 | 760 | case kBeauty: |
fe4da5cc | 761 | func=YBeauty; |
762 | break; | |
34f60c01 | 763 | case kPion: |
753690b0 | 764 | func=YPion; |
765 | break; | |
34f60c01 | 766 | case kKaon: |
753690b0 | 767 | func=YKaon; |
768 | break; | |
119b35c7 | 769 | default: |
770 | func=0; | |
771 | printf("<AliGenMUONlib::GetY> unknown parametrisation\n"); | |
fe4da5cc | 772 | } |
773 | return func; | |
774 | } | |
65fb704d | 775 | typedef Int_t (*GenFuncIp) (TRandom *); |
198bb1c7 | 776 | GenFuncIp AliGenMUONlib::GetIp(Int_t param, const char* /*tname*/) const |
fe4da5cc | 777 | { |
d90f80fd | 778 | // Return pointer to particle type parameterisation |
fe4da5cc | 779 | GenFuncIp func; |
753690b0 | 780 | switch (param) |
fe4da5cc | 781 | { |
34f60c01 | 782 | case kPhi: |
fe4da5cc | 783 | func=IpPhi; |
784 | break; | |
89512a3b | 785 | case kEta: |
786 | func=IpEta; | |
787 | break; | |
788 | case kOmega: | |
789 | func=IpOmega; | |
790 | break; | |
34f60c01 | 791 | case kJpsi: |
17d28ba5 | 792 | case kJpsiFromB: |
fe4da5cc | 793 | func=IpJpsi; |
794 | break; | |
34f60c01 | 795 | case kUpsilon: |
fe4da5cc | 796 | func=IpUpsilon; |
797 | break; | |
34f60c01 | 798 | case kCharm: |
fe4da5cc | 799 | func=IpCharm; |
800 | break; | |
34f60c01 | 801 | case kBeauty: |
fe4da5cc | 802 | func=IpBeauty; |
803 | break; | |
34f60c01 | 804 | case kPion: |
753690b0 | 805 | func=IpPion; |
806 | break; | |
34f60c01 | 807 | case kKaon: |
753690b0 | 808 | func=IpKaon; |
809 | break; | |
119b35c7 | 810 | default: |
811 | func=0; | |
812 | printf("<AliGenMUONlib::GetIp> unknown parametrisation\n"); | |
fe4da5cc | 813 | } |
814 | return func; | |
815 | } | |
816 | ||
817 | ||
753690b0 | 818 | |
05932df6 | 819 | Float_t AliGenMUONlib::Interpolate(Float_t x, Float_t* y, Float_t x0, |
820 | Float_t dx, | |
821 | Int_t n, Int_t no) | |
822 | { | |
823 | // | |
824 | // Neville's alorithm for interpolation | |
825 | // | |
826 | // x: x-value | |
827 | // y: Input array | |
828 | // x0: minimum x | |
829 | // dx: step size | |
830 | // n: number of data points | |
831 | // no: order of polynom | |
832 | // | |
833 | Float_t* c = new Float_t[n]; | |
834 | Float_t* d = new Float_t[n]; | |
835 | Int_t m, i; | |
836 | for (i = 0; i < n; i++) { | |
837 | c[i] = y[i]; | |
838 | d[i] = y[i]; | |
839 | } | |
840 | ||
841 | Int_t ns = int((x - x0)/dx); | |
842 | ||
843 | Float_t y1 = y[ns]; | |
844 | ns--; | |
845 | for (m = 0; m < no; m++) { | |
846 | for (i = 0; i < n-m; i++) { | |
847 | Float_t ho = x0 + Float_t(i) * dx - x; | |
848 | Float_t hp = x0 + Float_t(i+m+1) * dx - x; | |
849 | Float_t w = c[i+1] - d[i]; | |
850 | Float_t den = ho-hp; | |
851 | den = w/den; | |
852 | d[i] = hp * den; | |
853 | c[i] = ho * den; | |
854 | } | |
855 | Float_t dy; | |
856 | ||
857 | if (2*ns < (n-m-1)) { | |
858 | dy = c[ns+1]; | |
859 | } else { | |
860 | dy = d[ns--]; | |
861 | } | |
862 | y1 += dy;} | |
863 | delete[] c; | |
864 | delete[] d; | |
865 | ||
866 | return y1; | |
867 | } | |
868 | ||
753690b0 | 869 |