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