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8d2cd130 | 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 | ||
7cdba479 | 16 | /* $Id$ */ |
8d2cd130 | 17 | |
18 | #include "AliPythia.h" | |
7cdba479 | 19 | #include "AliPythiaRndm.h" |
0f482ae4 | 20 | #include "../FASTSIM/AliFastGlauber.h" |
21 | #include "../FASTSIM/AliQuenchingWeights.h" | |
22 | #include "TVector3.h" | |
8d2cd130 | 23 | |
24 | ClassImp(AliPythia) | |
25 | ||
26 | #ifndef WIN32 | |
27 | # define pyclus pyclus_ | |
28 | # define pycell pycell_ | |
452af8c7 | 29 | # define pyshow pyshow_ |
30 | # define pyrobo pyrobo_ | |
992f2843 | 31 | # define pyquen pyquen_ |
16a82508 | 32 | # define pyevnw pyevnw_ |
8d2cd130 | 33 | # define type_of_call |
34 | #else | |
35 | # define pyclus PYCLUS | |
36 | # define pycell PYCELL | |
452af8c7 | 37 | # define pyrobo PYROBO |
992f2843 | 38 | # define pyquen PYQUEN |
16a82508 | 39 | # define pyevnw PYEVNW |
8d2cd130 | 40 | # define type_of_call _stdcall |
41 | #endif | |
42 | ||
43 | extern "C" void type_of_call pyclus(Int_t & ); | |
44 | extern "C" void type_of_call pycell(Int_t & ); | |
452af8c7 | 45 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); |
46 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); | |
992f2843 | 47 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); |
0a2cfc0a | 48 | extern "C" void type_of_call pyevnw(){;} |
8d2cd130 | 49 | |
50 | //_____________________________________________________________________________ | |
51 | ||
52 | AliPythia* AliPythia::fgAliPythia=NULL; | |
53 | ||
54 | AliPythia::AliPythia() | |
55 | { | |
56 | // Default Constructor | |
57 | // | |
58 | // Set random number | |
7cdba479 | 59 | if (!AliPythiaRndm::GetPythiaRandom()) |
60 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
0f482ae4 | 61 | fGlauber = 0; |
62 | fQuenchingWeights = 0; | |
8d2cd130 | 63 | } |
64 | ||
65 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) | |
66 | { | |
67 | // Initialise the process to generate | |
7cdba479 | 68 | if (!AliPythiaRndm::GetPythiaRandom()) |
69 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
8d2cd130 | 70 | |
71 | fProcess = process; | |
72 | fEcms = energy; | |
73 | fStrucFunc = strucfunc; | |
1d5b1b20 | 74 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. |
75 | SetMDCY(Pycomp(111) ,1,0); | |
76 | SetMDCY(Pycomp(310) ,1,0); | |
77 | SetMDCY(Pycomp(3122),1,0); | |
78 | SetMDCY(Pycomp(3112),1,0); | |
79 | SetMDCY(Pycomp(3212),1,0); | |
80 | SetMDCY(Pycomp(3222),1,0); | |
81 | SetMDCY(Pycomp(3312),1,0); | |
82 | SetMDCY(Pycomp(3322),1,0); | |
83 | SetMDCY(Pycomp(3334),1,0); | |
84 | // select structure function | |
8d2cd130 | 85 | SetMSTP(52,2); |
86 | SetMSTP(51,strucfunc); | |
87 | // | |
88 | // Pythia initialisation for selected processes// | |
89 | // | |
90 | // Make MSEL clean | |
91 | // | |
92 | for (Int_t i=1; i<= 200; i++) { | |
93 | SetMSUB(i,0); | |
94 | } | |
95 | // select charm production | |
96 | switch (process) | |
97 | { | |
65f2626c | 98 | case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes |
99 | // Multiple interactions on. | |
100 | SetMSTP(81,1); | |
101 | // Double Gaussian matter distribution. | |
102 | SetMSTP(82,4); | |
103 | SetPARP(83,0.5); | |
104 | SetPARP(84,0.4); | |
105 | // pT0. | |
106 | SetPARP(82,2.0); | |
107 | // Reference energy for pT0 and energy rescaling pace. | |
108 | SetPARP(89,1800); | |
109 | SetPARP(90,0.25); | |
110 | // String drawing almost completely minimizes string length. | |
111 | SetPARP(85,0.9); | |
112 | SetPARP(86,0.95); | |
113 | // ISR and FSR activity. | |
114 | SetPARP(67,4); | |
115 | SetPARP(71,4); | |
116 | // Lambda_FSR scale. | |
117 | SetPARJ(81,0.29); | |
118 | break; | |
119 | case kPyOldUEQ2ordered2: | |
120 | // Old underlying events with Q2 ordered QCD processes | |
121 | // Multiple interactions on. | |
122 | SetMSTP(81,1); | |
123 | // Double Gaussian matter distribution. | |
124 | SetMSTP(82,4); | |
125 | SetPARP(83,0.5); | |
126 | SetPARP(84,0.4); | |
127 | // pT0. | |
128 | SetPARP(82,2.0); | |
129 | // Reference energy for pT0 and energy rescaling pace. | |
130 | SetPARP(89,1800); | |
131 | SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered | |
132 | // String drawing almost completely minimizes string length. | |
133 | SetPARP(85,0.9); | |
134 | SetPARP(86,0.95); | |
135 | // ISR and FSR activity. | |
136 | SetPARP(67,4); | |
137 | SetPARP(71,4); | |
138 | // Lambda_FSR scale. | |
139 | SetPARJ(81,0.29); | |
140 | break; | |
141 | case kPyOldPopcorn: | |
142 | // Old production mechanism: Old Popcorn | |
143 | SetMSEL(1); | |
144 | SetMSTJ(12,3); | |
145 | // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon | |
146 | SetMSTP(88,2); | |
147 | // (D=1)see can be used to form baryons (BARYON JUNCTION) | |
148 | SetMSTJ(1,1); | |
149 | SetMSTP(51,kCTEQ5L);// CTEQ 5L ! CTEQ5L pdf | |
150 | SetMSTP(81,1); // Multiple Interactions ON | |
151 | SetMSTP(82,4); // Double Gaussian Model | |
152 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
153 | SetPARP(89,1000.); // [GeV] Ref. energy | |
154 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
155 | SetPARP(83,0.5); // Core density in proton matter dist. (def.value) | |
156 | SetPARP(84,0.5); // Core radius | |
157 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
158 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
159 | SetPARP(67,1); // Regulate gluon prod. mechanism | |
160 | break; | |
8d2cd130 | 161 | case kPyCharm: |
162 | SetMSEL(4); | |
8d2cd130 | 163 | // heavy quark masses |
164 | ||
165 | SetPMAS(4,1,1.2); | |
166 | SetMSTU(16,2); | |
167 | // | |
168 | // primordial pT | |
169 | SetMSTP(91,1); | |
170 | SetPARP(91,1.); | |
171 | SetPARP(93,5.); | |
172 | // | |
173 | break; | |
174 | case kPyBeauty: | |
175 | SetMSEL(5); | |
176 | SetPMAS(5,1,4.75); | |
177 | SetMSTU(16,2); | |
178 | break; | |
179 | case kPyJpsi: | |
180 | SetMSEL(0); | |
181 | // gg->J/Psi g | |
182 | SetMSUB(86,1); | |
183 | break; | |
184 | case kPyJpsiChi: | |
185 | SetMSEL(0); | |
186 | // gg->J/Psi g | |
187 | SetMSUB(86,1); | |
188 | // gg-> chi_0c g | |
189 | SetMSUB(87,1); | |
190 | // gg-> chi_1c g | |
191 | SetMSUB(88,1); | |
192 | // gg-> chi_2c g | |
193 | SetMSUB(89,1); | |
194 | break; | |
195 | case kPyCharmUnforced: | |
196 | SetMSEL(0); | |
197 | // gq->qg | |
198 | SetMSUB(28,1); | |
199 | // gg->qq | |
200 | SetMSUB(53,1); | |
201 | // gg->gg | |
202 | SetMSUB(68,1); | |
203 | break; | |
204 | case kPyBeautyUnforced: | |
205 | SetMSEL(0); | |
206 | // gq->qg | |
207 | SetMSUB(28,1); | |
208 | // gg->qq | |
209 | SetMSUB(53,1); | |
210 | // gg->gg | |
211 | SetMSUB(68,1); | |
212 | break; | |
213 | case kPyMb: | |
214 | // Minimum Bias pp-Collisions | |
215 | // | |
216 | // | |
217 | // select Pythia min. bias model | |
218 | SetMSEL(0); | |
511db649 | 219 | SetMSUB(92,1); // single diffraction AB-->XB |
220 | SetMSUB(93,1); // single diffraction AB-->AX | |
221 | SetMSUB(94,1); // double diffraction | |
222 | SetMSUB(95,1); // low pt production | |
223 | ||
224 | // | |
225 | // ATLAS Tuning | |
226 | // | |
c01c4118 | 227 | |
228 | SetMSTP(51, kCTEQ5L); // CTEQ5L pdf | |
511db649 | 229 | SetMSTP(81,1); // Multiple Interactions ON |
230 | SetMSTP(82,4); // Double Gaussian Model | |
231 | ||
232 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
233 | SetPARP(89,1000.); // [GeV] Ref. energy | |
234 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
235 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
236 | SetPARP(84,0.5); // Core radius | |
237 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
238 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
239 | SetPARP(67,1); // Regulates Initial State Radiation | |
240 | break; | |
8d2cd130 | 241 | case kPyMbNonDiffr: |
242 | // Minimum Bias pp-Collisions | |
243 | // | |
244 | // | |
245 | // select Pythia min. bias model | |
246 | SetMSEL(0); | |
511db649 | 247 | SetMSUB(95,1); // low pt production |
0f482ae4 | 248 | |
249 | // | |
250 | // ATLAS Tuning | |
251 | // | |
511db649 | 252 | |
d682afd1 | 253 | SetMSTP(51,kCTEQ5L); // CTEQ5L pdf |
511db649 | 254 | SetMSTP(81,1); // Multiple Interactions ON |
255 | SetMSTP(82,4); // Double Gaussian Model | |
256 | ||
257 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
258 | SetPARP(89,1000.); // [GeV] Ref. energy | |
259 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
260 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
261 | SetPARP(84,0.5); // Core radius | |
262 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
263 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
264 | SetPARP(67,1); // Regulates Initial State Radiation | |
8d2cd130 | 265 | break; |
266 | case kPyJets: | |
267 | // | |
268 | // QCD Jets | |
269 | // | |
270 | SetMSEL(1); | |
65f2626c | 271 | // Pythia Tune A (CDF) |
272 | // | |
273 | SetPARP(67,4.); // Regulates Initial State Radiation | |
274 | SetMSTP(82,4); // Double Gaussian Model | |
275 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy | |
276 | SetPARP(84,0.4); // Core radius | |
277 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism | |
278 | SetPARP(86,0.95); // Regulates gluon prod. mechanism | |
279 | SetPARP(89,1800.); // [GeV] Ref. energy | |
280 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) | |
281 | break; | |
8d2cd130 | 282 | case kPyDirectGamma: |
283 | SetMSEL(10); | |
284 | break; | |
adf4d898 | 285 | case kPyCharmPbPbMNR: |
286 | case kPyD0PbPbMNR: | |
8d2cd130 | 287 | // Tuning of Pythia parameters aimed to get a resonable agreement |
288 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
289 | // c-cbar single inclusive and double differential distributions. | |
290 | // This parameter settings are meant to work with Pb-Pb collisions | |
adf4d898 | 291 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
8d2cd130 | 292 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
293 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
294 | ||
295 | // All QCD processes | |
296 | SetMSEL(1); | |
297 | ||
298 | // No multiple interactions | |
299 | SetMSTP(81,0); | |
300 | SetPARP(81,0.0); | |
301 | SetPARP(82,0.0); | |
302 | ||
303 | // Initial/final parton shower on (Pythia default) | |
304 | SetMSTP(61,1); | |
305 | SetMSTP(71,1); | |
306 | ||
307 | // 2nd order alpha_s | |
308 | SetMSTP(2,2); | |
309 | ||
310 | // QCD scales | |
311 | SetMSTP(32,2); | |
312 | SetPARP(34,1.0); | |
313 | ||
adf4d898 | 314 | // Intrinsic <kT> |
8d2cd130 | 315 | SetMSTP(91,1); |
316 | SetPARP(91,1.304); | |
317 | SetPARP(93,6.52); | |
318 | ||
319 | // Set c-quark mass | |
320 | SetPMAS(4,1,1.2); | |
321 | ||
90d7b703 | 322 | break; |
323 | case kPyDPlusPbPbMNR: | |
324 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
325 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
326 | // c-cbar single inclusive and double differential distributions. | |
327 | // This parameter settings are meant to work with Pb-Pb collisions | |
328 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
329 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
330 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
331 | ||
332 | // All QCD processes | |
333 | SetMSEL(1); | |
334 | ||
335 | // No multiple interactions | |
336 | SetMSTP(81,0); | |
337 | SetPARP(81,0.0); | |
338 | SetPARP(82,0.0); | |
339 | ||
340 | // Initial/final parton shower on (Pythia default) | |
341 | SetMSTP(61,1); | |
342 | SetMSTP(71,1); | |
343 | ||
344 | // 2nd order alpha_s | |
345 | SetMSTP(2,2); | |
346 | ||
347 | // QCD scales | |
348 | SetMSTP(32,2); | |
349 | SetPARP(34,1.0); | |
350 | ||
351 | // Intrinsic <kT> | |
352 | SetMSTP(91,1); | |
353 | SetPARP(91,1.304); | |
354 | SetPARP(93,6.52); | |
355 | ||
356 | // Set c-quark mass | |
357 | SetPMAS(4,1,1.2); | |
358 | ||
8d2cd130 | 359 | break; |
adf4d898 | 360 | case kPyCharmpPbMNR: |
361 | case kPyD0pPbMNR: | |
362 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
363 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
364 | // c-cbar single inclusive and double differential distributions. | |
365 | // This parameter settings are meant to work with p-Pb collisions | |
366 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
367 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
368 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
369 | ||
370 | // All QCD processes | |
371 | SetMSEL(1); | |
372 | ||
373 | // No multiple interactions | |
374 | SetMSTP(81,0); | |
375 | SetPARP(81,0.0); | |
376 | SetPARP(82,0.0); | |
377 | ||
378 | // Initial/final parton shower on (Pythia default) | |
379 | SetMSTP(61,1); | |
380 | SetMSTP(71,1); | |
381 | ||
382 | // 2nd order alpha_s | |
383 | SetMSTP(2,2); | |
384 | ||
385 | // QCD scales | |
386 | SetMSTP(32,2); | |
387 | SetPARP(34,1.0); | |
388 | ||
389 | // Intrinsic <kT> | |
390 | SetMSTP(91,1); | |
391 | SetPARP(91,1.16); | |
392 | SetPARP(93,5.8); | |
393 | ||
394 | // Set c-quark mass | |
395 | SetPMAS(4,1,1.2); | |
396 | ||
90d7b703 | 397 | break; |
398 | case kPyDPluspPbMNR: | |
399 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
400 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
401 | // c-cbar single inclusive and double differential distributions. | |
402 | // This parameter settings are meant to work with p-Pb collisions | |
403 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
404 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
405 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
406 | ||
407 | // All QCD processes | |
408 | SetMSEL(1); | |
409 | ||
410 | // No multiple interactions | |
411 | SetMSTP(81,0); | |
412 | SetPARP(81,0.0); | |
413 | SetPARP(82,0.0); | |
414 | ||
415 | // Initial/final parton shower on (Pythia default) | |
416 | SetMSTP(61,1); | |
417 | SetMSTP(71,1); | |
418 | ||
419 | // 2nd order alpha_s | |
420 | SetMSTP(2,2); | |
421 | ||
422 | // QCD scales | |
423 | SetMSTP(32,2); | |
424 | SetPARP(34,1.0); | |
425 | ||
426 | // Intrinsic <kT> | |
427 | SetMSTP(91,1); | |
428 | SetPARP(91,1.16); | |
429 | SetPARP(93,5.8); | |
430 | ||
431 | // Set c-quark mass | |
432 | SetPMAS(4,1,1.2); | |
433 | ||
adf4d898 | 434 | break; |
435 | case kPyCharmppMNR: | |
436 | case kPyD0ppMNR: | |
437 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
438 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
439 | // c-cbar single inclusive and double differential distributions. | |
440 | // This parameter settings are meant to work with pp collisions | |
441 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
442 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
443 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
444 | ||
445 | // All QCD processes | |
446 | SetMSEL(1); | |
447 | ||
448 | // No multiple interactions | |
449 | SetMSTP(81,0); | |
450 | SetPARP(81,0.0); | |
451 | SetPARP(82,0.0); | |
452 | ||
453 | // Initial/final parton shower on (Pythia default) | |
454 | SetMSTP(61,1); | |
455 | SetMSTP(71,1); | |
456 | ||
457 | // 2nd order alpha_s | |
458 | SetMSTP(2,2); | |
459 | ||
460 | // QCD scales | |
461 | SetMSTP(32,2); | |
462 | SetPARP(34,1.0); | |
463 | ||
464 | // Intrinsic <kT^2> | |
465 | SetMSTP(91,1); | |
466 | SetPARP(91,1.); | |
467 | SetPARP(93,5.); | |
468 | ||
469 | // Set c-quark mass | |
470 | SetPMAS(4,1,1.2); | |
471 | ||
90d7b703 | 472 | break; |
473 | case kPyDPlusppMNR: | |
474 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
475 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
476 | // c-cbar single inclusive and double differential distributions. | |
477 | // This parameter settings are meant to work with pp collisions | |
478 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
479 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
480 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
481 | ||
482 | // All QCD processes | |
483 | SetMSEL(1); | |
484 | ||
485 | // No multiple interactions | |
486 | SetMSTP(81,0); | |
487 | SetPARP(81,0.0); | |
488 | SetPARP(82,0.0); | |
489 | ||
490 | // Initial/final parton shower on (Pythia default) | |
491 | SetMSTP(61,1); | |
492 | SetMSTP(71,1); | |
493 | ||
494 | // 2nd order alpha_s | |
495 | SetMSTP(2,2); | |
496 | ||
497 | // QCD scales | |
498 | SetMSTP(32,2); | |
499 | SetPARP(34,1.0); | |
500 | ||
501 | // Intrinsic <kT^2> | |
502 | SetMSTP(91,1); | |
503 | SetPARP(91,1.); | |
504 | SetPARP(93,5.); | |
505 | ||
506 | // Set c-quark mass | |
507 | SetPMAS(4,1,1.2); | |
508 | ||
adf4d898 | 509 | break; |
510 | case kPyBeautyPbPbMNR: | |
8d2cd130 | 511 | // Tuning of Pythia parameters aimed to get a resonable agreement |
512 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
513 | // b-bbar single inclusive and double differential distributions. | |
514 | // This parameter settings are meant to work with Pb-Pb collisions | |
515 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
516 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
517 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
518 | ||
519 | // All QCD processes | |
520 | SetMSEL(1); | |
521 | ||
522 | // No multiple interactions | |
523 | SetMSTP(81,0); | |
524 | SetPARP(81,0.0); | |
525 | SetPARP(82,0.0); | |
526 | ||
527 | // Initial/final parton shower on (Pythia default) | |
528 | SetMSTP(61,1); | |
529 | SetMSTP(71,1); | |
530 | ||
531 | // 2nd order alpha_s | |
532 | SetMSTP(2,2); | |
533 | ||
534 | // QCD scales | |
535 | SetMSTP(32,2); | |
536 | SetPARP(34,1.0); | |
537 | SetPARP(67,1.0); | |
538 | SetPARP(71,1.0); | |
539 | ||
adf4d898 | 540 | // Intrinsic <kT> |
8d2cd130 | 541 | SetMSTP(91,1); |
542 | SetPARP(91,2.035); | |
543 | SetPARP(93,10.17); | |
544 | ||
545 | // Set b-quark mass | |
546 | SetPMAS(5,1,4.75); | |
547 | ||
adf4d898 | 548 | break; |
549 | case kPyBeautypPbMNR: | |
550 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
551 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
552 | // b-bbar single inclusive and double differential distributions. | |
553 | // This parameter settings are meant to work with p-Pb collisions | |
554 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
555 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
556 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
557 | ||
558 | // All QCD processes | |
559 | SetMSEL(1); | |
560 | ||
561 | // No multiple interactions | |
562 | SetMSTP(81,0); | |
563 | SetPARP(81,0.0); | |
564 | SetPARP(82,0.0); | |
565 | ||
566 | // Initial/final parton shower on (Pythia default) | |
567 | SetMSTP(61,1); | |
568 | SetMSTP(71,1); | |
569 | ||
570 | // 2nd order alpha_s | |
571 | SetMSTP(2,2); | |
572 | ||
573 | // QCD scales | |
574 | SetMSTP(32,2); | |
575 | SetPARP(34,1.0); | |
576 | SetPARP(67,1.0); | |
577 | SetPARP(71,1.0); | |
578 | ||
579 | // Intrinsic <kT> | |
580 | SetMSTP(91,1); | |
581 | SetPARP(91,1.60); | |
582 | SetPARP(93,8.00); | |
583 | ||
584 | // Set b-quark mass | |
585 | SetPMAS(5,1,4.75); | |
586 | ||
587 | break; | |
588 | case kPyBeautyppMNR: | |
589 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
590 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
591 | // b-bbar single inclusive and double differential distributions. | |
592 | // This parameter settings are meant to work with pp collisions | |
593 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
594 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
595 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
596 | ||
597 | // All QCD processes | |
598 | SetMSEL(1); | |
599 | ||
600 | // No multiple interactions | |
601 | SetMSTP(81,0); | |
602 | SetPARP(81,0.0); | |
603 | SetPARP(82,0.0); | |
604 | ||
605 | // Initial/final parton shower on (Pythia default) | |
606 | SetMSTP(61,1); | |
607 | SetMSTP(71,1); | |
608 | ||
609 | // 2nd order alpha_s | |
610 | SetMSTP(2,2); | |
611 | ||
612 | // QCD scales | |
613 | SetMSTP(32,2); | |
614 | SetPARP(34,1.0); | |
615 | SetPARP(67,1.0); | |
616 | SetPARP(71,1.0); | |
617 | ||
618 | // Intrinsic <kT> | |
619 | SetMSTP(91,1); | |
620 | SetPARP(91,1.); | |
621 | SetPARP(93,5.); | |
622 | ||
623 | // Set b-quark mass | |
624 | SetPMAS(5,1,4.75); | |
625 | ||
8d2cd130 | 626 | break; |
589380c6 | 627 | |
628 | case kPyW: | |
629 | ||
630 | //Inclusive production of W+/- | |
631 | SetMSEL(0); | |
632 | //f fbar -> W+ | |
633 | SetMSUB(2,1); | |
634 | // //f fbar -> g W+ | |
635 | // SetMSUB(16,1); | |
636 | // //f fbar -> gamma W+ | |
637 | // SetMSUB(20,1); | |
638 | // //f g -> f W+ | |
639 | // SetMSUB(31,1); | |
640 | // //f gamma -> f W+ | |
641 | // SetMSUB(36,1); | |
642 | ||
643 | // Initial/final parton shower on (Pythia default) | |
644 | // With parton showers on we are generating "W inclusive process" | |
645 | SetMSTP(61,1); //Initial QCD & QED showers on | |
646 | SetMSTP(71,1); //Final QCD & QED showers on | |
647 | ||
648 | break; | |
0f6ee828 | 649 | |
650 | case kPyZ: | |
651 | ||
652 | //Inclusive production of Z | |
653 | SetMSEL(0); | |
654 | //f fbar -> Z/gamma | |
655 | SetMSUB(1,1); | |
656 | ||
657 | // // f fbar -> g Z/gamma | |
658 | // SetMSUB(15,1); | |
659 | // // f fbar -> gamma Z/gamma | |
660 | // SetMSUB(19,1); | |
661 | // // f g -> f Z/gamma | |
662 | // SetMSUB(30,1); | |
663 | // // f gamma -> f Z/gamma | |
664 | // SetMSUB(35,1); | |
665 | ||
666 | //only Z included, not gamma | |
667 | SetMSTP(43,2); | |
668 | ||
669 | // Initial/final parton shower on (Pythia default) | |
670 | // With parton showers on we are generating "Z inclusive process" | |
671 | SetMSTP(61,1); //Initial QCD & QED showers on | |
672 | SetMSTP(71,1); //Final QCD & QED showers on | |
673 | ||
674 | break; | |
675 | ||
8d2cd130 | 676 | } |
677 | // | |
678 | // Initialize PYTHIA | |
679 | SetMSTP(41,1); // all resonance decays switched on | |
680 | ||
681 | Initialize("CMS","p","p",fEcms); | |
682 | ||
683 | } | |
684 | ||
685 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
686 | { | |
687 | // Check Lund particle code (for debugging) | |
688 | Int_t kc=Pycomp(kf); | |
689 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
690 | return kc; | |
691 | } | |
692 | ||
693 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) | |
694 | { | |
695 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
696 | // The MSTP array in the PYPARS common block is used to enable and | |
697 | // select the nuclear structure functions. | |
698 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
699 | // =1: internal PYTHIA acording to MSTP(51) | |
700 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
701 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
702 | // MSTP(192) : Mass number of nucleus side 1 | |
703 | // MSTP(193) : Mass number of nucleus side 2 | |
704 | SetMSTP(52,2); | |
705 | SetMSTP(192, a1); | |
706 | SetMSTP(193, a2); | |
707 | } | |
708 | ||
709 | ||
710 | AliPythia* AliPythia::Instance() | |
711 | { | |
712 | // Set random number generator | |
713 | if (fgAliPythia) { | |
714 | return fgAliPythia; | |
715 | } else { | |
716 | fgAliPythia = new AliPythia(); | |
717 | return fgAliPythia; | |
718 | } | |
719 | } | |
720 | ||
721 | void AliPythia::PrintParticles() | |
722 | { | |
723 | // Print list of particl properties | |
724 | Int_t np = 0; | |
c31f1d37 | 725 | char* name = new char[16]; |
8d2cd130 | 726 | for (Int_t kf=0; kf<1000000; kf++) { |
727 | for (Int_t c = 1; c > -2; c-=2) { | |
8d2cd130 | 728 | Int_t kc = Pycomp(c*kf); |
729 | if (kc) { | |
730 | Float_t mass = GetPMAS(kc,1); | |
731 | Float_t width = GetPMAS(kc,2); | |
732 | Float_t tau = GetPMAS(kc,4); | |
c31f1d37 | 733 | |
8d2cd130 | 734 | Pyname(kf,name); |
735 | ||
736 | np++; | |
737 | ||
738 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
739 | c*kf, name, mass, width, tau); | |
740 | } | |
741 | } | |
742 | } | |
743 | printf("\n Number of particles %d \n \n", np); | |
744 | } | |
745 | ||
746 | void AliPythia::ResetDecayTable() | |
747 | { | |
748 | // Set default values for pythia decay switches | |
749 | Int_t i; | |
750 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
751 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
752 | } | |
753 | ||
754 | void AliPythia::SetDecayTable() | |
755 | { | |
756 | // Set default values for pythia decay switches | |
757 | // | |
758 | Int_t i; | |
759 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
760 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
761 | } | |
762 | ||
763 | void AliPythia::Pyclus(Int_t& njet) | |
764 | { | |
765 | // Call Pythia clustering algorithm | |
766 | // | |
767 | pyclus(njet); | |
768 | } | |
769 | ||
770 | void AliPythia::Pycell(Int_t& njet) | |
771 | { | |
772 | // Call Pythia jet reconstruction algorithm | |
773 | // | |
774 | pycell(njet); | |
775 | } | |
776 | ||
452af8c7 | 777 | void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) |
778 | { | |
779 | // Call Pythia jet reconstruction algorithm | |
780 | // | |
452af8c7 | 781 | pyshow(ip1, ip2, qmax); |
782 | } | |
783 | ||
784 | void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) | |
785 | { | |
786 | pyrobo(imi, ima, the, phi, bex, bey, bez); | |
787 | } | |
788 | ||
789 | ||
790 | ||
86b6ad68 | 791 | void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod) |
0f482ae4 | 792 | { |
793 | // Initializes | |
794 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann | |
795 | // (2) The nuclear geometry using the Glauber Model | |
796 | // | |
797 | ||
798 | ||
799 | fGlauber = new AliFastGlauber(); | |
800 | fGlauber->Init(2); | |
801 | fGlauber->SetCentralityClass(cMin, cMax); | |
802 | ||
803 | fQuenchingWeights = new AliQuenchingWeights(); | |
804 | fQuenchingWeights->InitMult(); | |
86b6ad68 | 805 | fQuenchingWeights->SetK(k); |
0f482ae4 | 806 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); |
0f482ae4 | 807 | } |
808 | ||
809 | ||
452af8c7 | 810 | void AliPythia::Quench() |
811 | { | |
812 | // | |
813 | // | |
814 | // Simple Jet Quenching routine: | |
815 | // ============================= | |
816 | // The jet formed by all final state partons radiated by the parton created | |
0f482ae4 | 817 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in |
818 | // the initial parton reference frame: | |
452af8c7 | 819 | // (E + p_z)new = (1-z) (E + p_z)old |
820 | // | |
0f482ae4 | 821 | // |
822 | // | |
823 | // | |
452af8c7 | 824 | // The lost momentum is first balanced by one gluon with virtuality > 0. |
825 | // Subsequently the gluon splits to yield two gluons with E = p. | |
826 | // | |
0f482ae4 | 827 | // |
828 | // | |
4e383037 | 829 | static Float_t eMean = 0.; |
830 | static Int_t icall = 0; | |
0f482ae4 | 831 | |
c2c598a3 | 832 | Double_t p0[4][5]; |
833 | Double_t p1[4][5]; | |
834 | Double_t p2[4][5]; | |
835 | Int_t klast[4] = {-1, -1, -1, -1}; | |
452af8c7 | 836 | |
837 | Int_t numpart = fPyjets->N; | |
86b6ad68 | 838 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; |
c2c598a3 | 839 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; |
840 | Bool_t quenched[4]; | |
b280c4cc | 841 | Double_t wjtKick[4]; |
c2c598a3 | 842 | Int_t nGluon[4]; |
86b6ad68 | 843 | Int_t qPdg[4]; |
0f482ae4 | 844 | Int_t imo, kst, pdg; |
b280c4cc | 845 | |
511db649 | 846 | // |
c2c598a3 | 847 | // Sore information about Primary partons |
848 | // | |
849 | // j = | |
850 | // 0, 1 partons from hard scattering | |
851 | // 2, 3 partons from initial state radiation | |
852 | // | |
853 | for (Int_t i = 2; i <= 7; i++) { | |
854 | Int_t j = 0; | |
855 | // Skip gluons that participate in hard scattering | |
856 | if (i == 4 || i == 5) continue; | |
857 | // Gluons from hard Scattering | |
858 | if (i == 6 || i == 7) { | |
859 | j = i - 6; | |
860 | pxq[j] = fPyjets->P[0][i]; | |
861 | pyq[j] = fPyjets->P[1][i]; | |
862 | pzq[j] = fPyjets->P[2][i]; | |
863 | eq[j] = fPyjets->P[3][i]; | |
864 | mq[j] = fPyjets->P[4][i]; | |
865 | } else { | |
866 | // Gluons from initial state radiation | |
867 | // | |
868 | // Obtain 4-momentum vector from difference between original parton and parton after gluon | |
869 | // radiation. Energy is calculated independently because initial state radition does not | |
870 | // conserve strictly momentum and energy for each partonic system independently. | |
871 | // | |
872 | // Not very clean. Should be improved ! | |
873 | // | |
874 | // | |
875 | j = i; | |
876 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; | |
877 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; | |
878 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; | |
879 | mq[j] = fPyjets->P[4][i]; | |
880 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); | |
881 | } | |
882 | // | |
883 | // Calculate some kinematic variables | |
511db649 | 884 | // |
4e383037 | 885 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); |
0f482ae4 | 886 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); |
887 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); | |
888 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); | |
889 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); | |
86b6ad68 | 890 | qPdg[j] = fPyjets->K[1][i]; |
891 | } | |
892 | ||
893 | Double_t int0[4]; | |
894 | Double_t int1[4]; | |
86b6ad68 | 895 | |
b280c4cc | 896 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); |
897 | ||
86b6ad68 | 898 | for (Int_t j = 0; j < 4; j++) { |
c2c598a3 | 899 | // |
900 | // Quench only central jets and with E > 10. | |
901 | // | |
86b6ad68 | 902 | |
903 | ||
904 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; | |
905 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); | |
906 | ||
c2c598a3 | 907 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { |
b280c4cc | 908 | fZQuench[j] = 0.; |
0f482ae4 | 909 | } else { |
c2c598a3 | 910 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { |
4e383037 | 911 | icall ++; |
912 | eMean += eloss; | |
913 | } | |
0f482ae4 | 914 | // |
915 | // Extra pt | |
86b6ad68 | 916 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); |
917 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); | |
0f482ae4 | 918 | // |
919 | // Fractional energy loss | |
b280c4cc | 920 | fZQuench[j] = eloss / eq[j]; |
0f482ae4 | 921 | // |
922 | // Avoid complete loss | |
923 | // | |
b280c4cc | 924 | if (fZQuench[j] == 1.) fZQuench[j] = 0.95; |
0f482ae4 | 925 | // |
926 | // Some debug printing | |
86b6ad68 | 927 | |
928 | ||
bf9bb016 | 929 | // printf("Initial parton # %3d, Type %3d Energy %10.3f Phi %10.3f Length %10.3f Loss %10.3f Kick %10.3f Mean: %10.3f %10.3f\n", |
930 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); | |
4e383037 | 931 | |
b280c4cc | 932 | // fZQuench[j] = 0.8; |
933 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); | |
0f482ae4 | 934 | } |
4e383037 | 935 | |
b280c4cc | 936 | quenched[j] = (fZQuench[j] > 0.01); |
4e383037 | 937 | } // primary partons |
c2c598a3 | 938 | |
b280c4cc | 939 | |
940 | ||
6e90ad26 | 941 | Double_t pNew[1000][4]; |
942 | Int_t kNew[1000]; | |
943 | Int_t icount = 0; | |
b280c4cc | 944 | Double_t zquench[4]; |
945 | ||
6e90ad26 | 946 | // |
4e383037 | 947 | // System Loop |
c2c598a3 | 948 | for (Int_t isys = 0; isys < 4; isys++) { |
6e90ad26 | 949 | // Skip to next system if not quenched. |
4e383037 | 950 | if (!quenched[isys]) continue; |
951 | ||
b280c4cc | 952 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); |
4e383037 | 953 | if (nGluon[isys] > 6) nGluon[isys] = 6; |
b280c4cc | 954 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); |
4e383037 | 955 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); |
0f482ae4 | 956 | |
4e383037 | 957 | |
958 | ||
959 | Int_t igMin = -1; | |
960 | Int_t igMax = -1; | |
961 | Double_t pg[4] = {0., 0., 0., 0.}; | |
962 | ||
963 | // | |
964 | // Loop on radiation events | |
965 | ||
966 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { | |
6e90ad26 | 967 | while (1) { |
968 | icount = 0; | |
969 | for (Int_t k = 0; k < 4; k++) | |
970 | { | |
971 | p0[isys][k] = 0.; | |
972 | p1[isys][k] = 0.; | |
973 | p2[isys][k] = 0.; | |
974 | } | |
975 | // Loop over partons | |
976 | for (Int_t i = 0; i < numpart; i++) | |
977 | { | |
978 | imo = fPyjets->K[2][i]; | |
979 | kst = fPyjets->K[0][i]; | |
980 | pdg = fPyjets->K[1][i]; | |
981 | ||
982 | ||
983 | ||
0f482ae4 | 984 | // Quarks and gluons only |
6e90ad26 | 985 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; |
0f482ae4 | 986 | // Particles from hard scattering only |
c2c598a3 | 987 | |
6e90ad26 | 988 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; |
c2c598a3 | 989 | Int_t imom = imo % 1000; |
990 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; | |
991 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; | |
992 | ||
6e90ad26 | 993 | |
0f482ae4 | 994 | // Skip comment lines |
6e90ad26 | 995 | if (kst != 1 && kst != 2) continue; |
0f482ae4 | 996 | // |
997 | // Parton kinematic | |
6e90ad26 | 998 | px = fPyjets->P[0][i]; |
999 | py = fPyjets->P[1][i]; | |
1000 | pz = fPyjets->P[2][i]; | |
1001 | e = fPyjets->P[3][i]; | |
1002 | m = fPyjets->P[4][i]; | |
1003 | pt = TMath::Sqrt(px * px + py * py); | |
1004 | p = TMath::Sqrt(px * px + py * py + pz * pz); | |
1005 | phi = TMath::Pi() + TMath::ATan2(-py, -px); | |
1006 | theta = TMath::ATan2(pt, pz); | |
1007 | ||
0f482ae4 | 1008 | // |
c2c598a3 | 1009 | // Save 4-momentum sum for balancing |
1010 | Int_t index = isys; | |
6e90ad26 | 1011 | |
1012 | p0[index][0] += px; | |
1013 | p0[index][1] += py; | |
1014 | p0[index][2] += pz; | |
1015 | p0[index][3] += e; | |
6e90ad26 | 1016 | |
1017 | klast[index] = i; | |
1018 | ||
0f482ae4 | 1019 | // |
1020 | // Fractional energy loss | |
b280c4cc | 1021 | Double_t z = zquench[index]; |
4e383037 | 1022 | |
c2c598a3 | 1023 | |
4e383037 | 1024 | // Don't fully quench radiated gluons |
1025 | // | |
1026 | if (imo > 1000) { | |
1027 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination | |
1028 | // | |
1029 | ||
c2c598a3 | 1030 | z = 0.02; |
4e383037 | 1031 | } |
c2c598a3 | 1032 | // printf("z: %d %f\n", imo, z); |
1033 | ||
4e383037 | 1034 | |
1035 | // | |
6e90ad26 | 1036 | |
1037 | // | |
1038 | // | |
1039 | // Transform into frame in which initial parton is along z-axis | |
1040 | // | |
1041 | TVector3 v(px, py, pz); | |
1042 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); | |
1043 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); | |
1044 | ||
1045 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); | |
1046 | Double_t mt2 = jt * jt + m * m; | |
1047 | Double_t zmax = 1.; | |
1048 | // | |
1049 | // Kinematic limit on z | |
1050 | // | |
4e383037 | 1051 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); |
6e90ad26 | 1052 | // |
1053 | // Change light-cone kinematics rel. to initial parton | |
1054 | // | |
1055 | Double_t eppzOld = e + pl; | |
1056 | Double_t empzOld = e - pl; | |
1057 | ||
1058 | Double_t eppzNew = (1. - z) * eppzOld; | |
1059 | Double_t empzNew = empzOld - mt2 * z / eppzOld; | |
1060 | Double_t eNew = 0.5 * (eppzNew + empzNew); | |
1061 | Double_t plNew = 0.5 * (eppzNew - empzNew); | |
1062 | ||
1063 | Double_t jtNew; | |
1064 | // | |
1065 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 | |
1066 | Double_t mt2New = eppzNew * empzNew; | |
1067 | if (mt2New < 1.e-8) mt2New = 0.; | |
4e383037 | 1068 | if (z < zmax) { |
1069 | if (m * m > mt2New) { | |
1070 | // | |
1071 | // This should not happen | |
1072 | // | |
1073 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); | |
1074 | jtNew = 0; | |
1075 | } else { | |
1076 | jtNew = TMath::Sqrt(mt2New - m * m); | |
1077 | } | |
6e90ad26 | 1078 | } else { |
4e383037 | 1079 | // If pT is to small (probably a leading massive particle) we scale only the energy |
1080 | // This can cause negative masses of the radiated gluon | |
1081 | // Let's hope for the best ... | |
1082 | jtNew = jt; | |
1083 | eNew = TMath::Sqrt(plNew * plNew + mt2); | |
1084 | ||
6e90ad26 | 1085 | } |
6e90ad26 | 1086 | // |
1087 | // Calculate new px, py | |
1088 | // | |
1089 | Double_t pxNew = jtNew / jt * pxs; | |
1090 | Double_t pyNew = jtNew / jt * pys; | |
1091 | ||
1092 | // Double_t dpx = pxs - pxNew; | |
1093 | // Double_t dpy = pys - pyNew; | |
1094 | // Double_t dpz = pl - plNew; | |
1095 | // Double_t de = e - eNew; | |
1096 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; | |
1097 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); | |
1098 | // printf("New mass (2) %e %e \n", pxNew, pyNew); | |
1099 | // | |
1100 | // Rotate back | |
1101 | // | |
1102 | TVector3 w(pxNew, pyNew, plNew); | |
1103 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); | |
1104 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); | |
1105 | ||
1106 | p1[index][0] += pxNew; | |
1107 | p1[index][1] += pyNew; | |
1108 | p1[index][2] += plNew; | |
1109 | p1[index][3] += eNew; | |
1110 | // | |
1111 | // Updated 4-momentum vectors | |
1112 | // | |
1113 | pNew[icount][0] = pxNew; | |
1114 | pNew[icount][1] = pyNew; | |
1115 | pNew[icount][2] = plNew; | |
1116 | pNew[icount][3] = eNew; | |
1117 | kNew[icount] = i; | |
1118 | icount++; | |
1119 | } // parton loop | |
0f482ae4 | 1120 | // |
6e90ad26 | 1121 | // Check if there was phase-space for quenching |
0f482ae4 | 1122 | // |
0f482ae4 | 1123 | |
6e90ad26 | 1124 | if (icount == 0) quenched[isys] = kFALSE; |
1125 | if (!quenched[isys]) break; | |
1126 | ||
1127 | for (Int_t j = 0; j < 4; j++) | |
1128 | { | |
1129 | p2[isys][j] = p0[isys][j] - p1[isys][j]; | |
1130 | } | |
1131 | p2[isys][4] = p2[isys][3] * p2[isys][3] - p2[isys][0] * p2[isys][0] - p2[isys][1] * p2[isys][1] - p2[isys][2] * p2[isys][2]; | |
6e90ad26 | 1132 | if (p2[isys][4] > 0.) { |
1133 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); | |
1134 | break; | |
1135 | } else { | |
b280c4cc | 1136 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); |
4e383037 | 1137 | printf("4-Momentum: %10.3e %10.3e %10.3e %10.3e %10.3e \n", p2[isys][0], p2[isys][1], p2[isys][2], p2[isys][3], p2[isys][4]); |
6e90ad26 | 1138 | if (p2[isys][4] < -0.01) { |
4e383037 | 1139 | printf("Negative mass squared !\n"); |
1140 | // Here we have to put the gluon back to mass shell | |
1141 | // This will lead to a small energy imbalance | |
1142 | p2[isys][4] = 0.; | |
1143 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); | |
1144 | break; | |
6e90ad26 | 1145 | } else { |
1146 | p2[isys][4] = 0.; | |
1147 | break; | |
1148 | } | |
1149 | } | |
6e90ad26 | 1150 | /* |
6e90ad26 | 1151 | zHeavy *= 0.98; |
1152 | printf("zHeavy lowered to %f\n", zHeavy); | |
1153 | if (zHeavy < 0.01) { | |
1154 | printf("No success ! \n"); | |
1155 | icount = 0; | |
1156 | quenched[isys] = kFALSE; | |
1157 | break; | |
1158 | } | |
4e383037 | 1159 | */ |
1160 | } // iteration on z (while) | |
1161 | ||
6e90ad26 | 1162 | // Update event record |
1163 | for (Int_t k = 0; k < icount; k++) { | |
1164 | // printf("%6d %6d %10.3e %10.3e %10.3e %10.3e\n", k, kNew[k], pNew[k][0],pNew[k][1], pNew[k][2], pNew[k][3] ); | |
1165 | fPyjets->P[0][kNew[k]] = pNew[k][0]; | |
1166 | fPyjets->P[1][kNew[k]] = pNew[k][1]; | |
1167 | fPyjets->P[2][kNew[k]] = pNew[k][2]; | |
1168 | fPyjets->P[3][kNew[k]] = pNew[k][3]; | |
0f482ae4 | 1169 | } |
4e383037 | 1170 | // |
1171 | // Add the gluons | |
1172 | // | |
1173 | Int_t ish = 0; | |
1837e95c | 1174 | Int_t iGlu; |
4e383037 | 1175 | if (!quenched[isys]) continue; |
0f482ae4 | 1176 | // |
1177 | // Last parton from shower i | |
4e383037 | 1178 | Int_t in = klast[isys]; |
0f482ae4 | 1179 | // |
1180 | // Continue if no parton in shower i selected | |
1181 | if (in == -1) continue; | |
1182 | // | |
1183 | // If this is the second initial parton and it is behind the first move pointer by previous ish | |
4e383037 | 1184 | if (isys == 1 && klast[1] > klast[0]) in += ish; |
0f482ae4 | 1185 | // |
1186 | // Starting index | |
452af8c7 | 1187 | |
4e383037 | 1188 | // jmin = in - 1; |
0f482ae4 | 1189 | // How many additional gluons will be generated |
1190 | ish = 1; | |
4e383037 | 1191 | if (p2[isys][4] > 0.05) ish = 2; |
0f482ae4 | 1192 | // |
1193 | // Position of gluons | |
4e383037 | 1194 | iGlu = numpart; |
1195 | if (iglu == 0) igMin = iGlu; | |
1196 | igMax = iGlu; | |
0f482ae4 | 1197 | numpart += ish; |
1198 | (fPyjets->N) += ish; | |
4e383037 | 1199 | |
0f482ae4 | 1200 | if (ish == 1) { |
4e383037 | 1201 | fPyjets->P[0][iGlu] = p2[isys][0]; |
1202 | fPyjets->P[1][iGlu] = p2[isys][1]; | |
1203 | fPyjets->P[2][iGlu] = p2[isys][2]; | |
1204 | fPyjets->P[3][iGlu] = p2[isys][3]; | |
1205 | fPyjets->P[4][iGlu] = p2[isys][4]; | |
0f482ae4 | 1206 | |
4e383037 | 1207 | fPyjets->K[0][iGlu] = 1; |
1208 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; | |
0f482ae4 | 1209 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1210 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1211 | fPyjets->K[3][iGlu] = -1; |
1212 | fPyjets->K[4][iGlu] = -1; | |
4e383037 | 1213 | |
1214 | pg[0] += p2[isys][0]; | |
1215 | pg[1] += p2[isys][1]; | |
1216 | pg[2] += p2[isys][2]; | |
1217 | pg[3] += p2[isys][3]; | |
0f482ae4 | 1218 | } else { |
1219 | // | |
1220 | // Split gluon in rest frame. | |
1221 | // | |
4e383037 | 1222 | Double_t bx = p2[isys][0] / p2[isys][3]; |
1223 | Double_t by = p2[isys][1] / p2[isys][3]; | |
1224 | Double_t bz = p2[isys][2] / p2[isys][3]; | |
1225 | Double_t pst = p2[isys][4] / 2.; | |
0f482ae4 | 1226 | // |
1227 | // Isotropic decay ???? | |
1228 | Double_t cost = 2. * gRandom->Rndm() - 1.; | |
1229 | Double_t sint = TMath::Sqrt(1. - cost * cost); | |
1230 | Double_t phi = 2. * TMath::Pi() * gRandom->Rndm(); | |
1231 | ||
1232 | Double_t pz1 = pst * cost; | |
1233 | Double_t pz2 = -pst * cost; | |
1234 | Double_t pt1 = pst * sint; | |
1235 | Double_t pt2 = -pst * sint; | |
1236 | Double_t px1 = pt1 * TMath::Cos(phi); | |
1237 | Double_t py1 = pt1 * TMath::Sin(phi); | |
1238 | Double_t px2 = pt2 * TMath::Cos(phi); | |
1239 | Double_t py2 = pt2 * TMath::Sin(phi); | |
1240 | ||
1241 | fPyjets->P[0][iGlu] = px1; | |
1242 | fPyjets->P[1][iGlu] = py1; | |
1243 | fPyjets->P[2][iGlu] = pz1; | |
1244 | fPyjets->P[3][iGlu] = pst; | |
1245 | fPyjets->P[4][iGlu] = 0.; | |
1246 | ||
4e383037 | 1247 | fPyjets->K[0][iGlu] = 1 ; |
0f482ae4 | 1248 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1249 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1250 | fPyjets->K[3][iGlu] = -1; |
1251 | fPyjets->K[4][iGlu] = -1; | |
1252 | ||
1253 | fPyjets->P[0][iGlu+1] = px2; | |
1254 | fPyjets->P[1][iGlu+1] = py2; | |
1255 | fPyjets->P[2][iGlu+1] = pz2; | |
1256 | fPyjets->P[3][iGlu+1] = pst; | |
1257 | fPyjets->P[4][iGlu+1] = 0.; | |
1258 | ||
4e383037 | 1259 | fPyjets->K[0][iGlu+1] = 1; |
1260 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; | |
0f482ae4 | 1261 | fPyjets->K[1][iGlu+1] = 21; |
4e383037 | 1262 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1263 | fPyjets->K[3][iGlu+1] = -1; |
1264 | fPyjets->K[4][iGlu+1] = -1; | |
1265 | SetMSTU(1,0); | |
1266 | SetMSTU(2,0); | |
1267 | // | |
1268 | // Boost back | |
1269 | // | |
1270 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); | |
1271 | } | |
4e383037 | 1272 | /* |
1273 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { | |
1274 | Double_t px, py, pz; | |
1275 | px = fPyjets->P[0][ig]; | |
1276 | py = fPyjets->P[1][ig]; | |
1277 | pz = fPyjets->P[2][ig]; | |
1278 | TVector3 v(px, py, pz); | |
1279 | v.RotateZ(-phiq[isys]); | |
1280 | v.RotateY(-thetaq[isys]); | |
1281 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); | |
1282 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1283 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); | |
1284 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); | |
1285 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1286 | pxs += jtKick * TMath::Cos(phiKick); | |
1287 | pys += jtKick * TMath::Sin(phiKick); | |
1288 | TVector3 w(pxs, pys, pzs); | |
1289 | w.RotateY(thetaq[isys]); | |
1290 | w.RotateZ(phiq[isys]); | |
1291 | fPyjets->P[0][ig] = w.X(); | |
1292 | fPyjets->P[1][ig] = w.Y(); | |
1293 | fPyjets->P[2][ig] = w.Z(); | |
1294 | fPyjets->P[2][ig] = w.Mag(); | |
1295 | } | |
1296 | */ | |
1297 | } // kGluon | |
1298 | ||
6e90ad26 | 1299 | |
4e383037 | 1300 | // Check energy conservation |
0f482ae4 | 1301 | Double_t pxs = 0.; |
1302 | Double_t pys = 0.; | |
1303 | Double_t pzs = 0.; | |
1304 | Double_t es = 14000.; | |
1305 | ||
1306 | for (Int_t i = 0; i < numpart; i++) | |
1307 | { | |
1308 | kst = fPyjets->K[0][i]; | |
1309 | if (kst != 1 && kst != 2) continue; | |
1310 | pxs += fPyjets->P[0][i]; | |
1311 | pys += fPyjets->P[1][i]; | |
1312 | pzs += fPyjets->P[2][i]; | |
1313 | es -= fPyjets->P[3][i]; | |
1314 | } | |
1315 | if (TMath::Abs(pxs) > 1.e-2 || | |
1316 | TMath::Abs(pys) > 1.e-2 || | |
1317 | TMath::Abs(pzs) > 1.e-1) { | |
1318 | printf("%e %e %e %e\n", pxs, pys, pzs, es); | |
4e383037 | 1319 | // Fatal("Quench()", "4-Momentum non-conservation"); |
452af8c7 | 1320 | } |
4e383037 | 1321 | |
1322 | } // end quenching loop (systems) | |
6e90ad26 | 1323 | // Clean-up |
0f482ae4 | 1324 | for (Int_t i = 0; i < numpart; i++) |
1325 | { | |
4e383037 | 1326 | imo = fPyjets->K[2][i]; |
1327 | if (imo > 1000) { | |
1328 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; | |
1329 | } | |
0f482ae4 | 1330 | } |
4e383037 | 1331 | // this->Pylist(1); |
0f482ae4 | 1332 | } // end quench |
90d7b703 | 1333 | |
992f2843 | 1334 | |
1335 | void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b) | |
1336 | { | |
1337 | // Igor Lokthine's quenching routine | |
1338 | pyquen(a, ibf, b); | |
1339 | } | |
b280c4cc | 1340 | |
16a82508 | 1341 | void AliPythia::Pyevnw() |
1342 | { | |
1343 | // New multiple interaction scenario | |
1344 | pyevnw(); | |
1345 | } | |
1346 | ||
b280c4cc | 1347 | void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) |
1348 | { | |
1349 | // Return event specific quenching parameters | |
1350 | xp = fXJet; | |
1351 | yp = fYJet; | |
1352 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; | |
1353 | ||
1354 | } | |
1355 | ||
65f2626c | 1356 |