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6b435cde | 1 | |
8d2cd130 | 2 | /************************************************************************** |
3 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | * * | |
5 | * Author: The ALICE Off-line Project. * | |
6 | * Contributors are mentioned in the code where appropriate. * | |
7 | * * | |
8 | * Permission to use, copy, modify and distribute this software and its * | |
9 | * documentation strictly for non-commercial purposes is hereby granted * | |
10 | * without fee, provided that the above copyright notice appears in all * | |
11 | * copies and that both the copyright notice and this permission notice * | |
12 | * appear in the supporting documentation. The authors make no claims * | |
13 | * about the suitability of this software for any purpose. It is * | |
14 | * provided "as is" without express or implied warranty. * | |
15 | **************************************************************************/ | |
16 | ||
7cdba479 | 17 | /* $Id$ */ |
8d2cd130 | 18 | |
19 | #include "AliPythia.h" | |
7cdba479 | 20 | #include "AliPythiaRndm.h" |
0f482ae4 | 21 | #include "../FASTSIM/AliFastGlauber.h" |
22 | #include "../FASTSIM/AliQuenchingWeights.h" | |
23 | #include "TVector3.h" | |
8d2cd130 | 24 | |
25 | ClassImp(AliPythia) | |
26 | ||
27 | #ifndef WIN32 | |
28 | # define pyclus pyclus_ | |
29 | # define pycell pycell_ | |
452af8c7 | 30 | # define pyshow pyshow_ |
31 | # define pyrobo pyrobo_ | |
992f2843 | 32 | # define pyquen pyquen_ |
16a82508 | 33 | # define pyevnw pyevnw_ |
8d2cd130 | 34 | # define type_of_call |
35 | #else | |
36 | # define pyclus PYCLUS | |
37 | # define pycell PYCELL | |
452af8c7 | 38 | # define pyrobo PYROBO |
992f2843 | 39 | # define pyquen PYQUEN |
16a82508 | 40 | # define pyevnw PYEVNW |
8d2cd130 | 41 | # define type_of_call _stdcall |
42 | #endif | |
43 | ||
44 | extern "C" void type_of_call pyclus(Int_t & ); | |
45 | extern "C" void type_of_call pycell(Int_t & ); | |
452af8c7 | 46 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); |
47 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); | |
992f2843 | 48 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); |
0a2cfc0a | 49 | extern "C" void type_of_call pyevnw(){;} |
8d2cd130 | 50 | |
51 | //_____________________________________________________________________________ | |
52 | ||
53 | AliPythia* AliPythia::fgAliPythia=NULL; | |
54 | ||
e8a8adcd | 55 | AliPythia::AliPythia(): |
56 | fProcess(kPyMb), | |
57 | fEcms(0.), | |
58 | fStrucFunc(kCTEQ5L), | |
59 | fXJet(0.), | |
60 | fYJet(0.), | |
32c8e463 | 61 | fNGmax(30), |
62 | fZmax(0.97), | |
e8a8adcd | 63 | fGlauber(0), |
64 | fQuenchingWeights(0) | |
8d2cd130 | 65 | { |
66 | // Default Constructor | |
67 | // | |
68 | // Set random number | |
7cdba479 | 69 | if (!AliPythiaRndm::GetPythiaRandom()) |
70 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
0f482ae4 | 71 | fGlauber = 0; |
72 | fQuenchingWeights = 0; | |
8d2cd130 | 73 | } |
74 | ||
e8a8adcd | 75 | AliPythia::AliPythia(const AliPythia& pythia): |
6b435cde | 76 | TPythia6(pythia), |
77 | AliRndm(pythia), | |
e8a8adcd | 78 | fProcess(kPyMb), |
79 | fEcms(0.), | |
80 | fStrucFunc(kCTEQ5L), | |
81 | fXJet(0.), | |
82 | fYJet(0.), | |
32c8e463 | 83 | fNGmax(30), |
84 | fZmax(0.97), | |
e8a8adcd | 85 | fGlauber(0), |
86 | fQuenchingWeights(0) | |
87 | { | |
88 | // Copy Constructor | |
89 | pythia.Copy(*this); | |
90 | } | |
91 | ||
8d2cd130 | 92 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) |
93 | { | |
94 | // Initialise the process to generate | |
7cdba479 | 95 | if (!AliPythiaRndm::GetPythiaRandom()) |
96 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
8d2cd130 | 97 | |
98 | fProcess = process; | |
99 | fEcms = energy; | |
100 | fStrucFunc = strucfunc; | |
1d5b1b20 | 101 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. |
102 | SetMDCY(Pycomp(111) ,1,0); | |
103 | SetMDCY(Pycomp(310) ,1,0); | |
104 | SetMDCY(Pycomp(3122),1,0); | |
105 | SetMDCY(Pycomp(3112),1,0); | |
106 | SetMDCY(Pycomp(3212),1,0); | |
107 | SetMDCY(Pycomp(3222),1,0); | |
108 | SetMDCY(Pycomp(3312),1,0); | |
109 | SetMDCY(Pycomp(3322),1,0); | |
110 | SetMDCY(Pycomp(3334),1,0); | |
1c50ec12 | 111 | // Select structure function |
8d2cd130 | 112 | SetMSTP(52,2); |
113 | SetMSTP(51,strucfunc); | |
1c50ec12 | 114 | // Particles produced in string fragmentation point directly to either of the two endpoints |
115 | // of the string (depending in the side they were generated from). | |
116 | SetMSTU(16,2); | |
117 | ||
8d2cd130 | 118 | // |
119 | // Pythia initialisation for selected processes// | |
120 | // | |
121 | // Make MSEL clean | |
122 | // | |
123 | for (Int_t i=1; i<= 200; i++) { | |
124 | SetMSUB(i,0); | |
125 | } | |
126 | // select charm production | |
127 | switch (process) | |
128 | { | |
65f2626c | 129 | case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes |
130 | // Multiple interactions on. | |
131 | SetMSTP(81,1); | |
132 | // Double Gaussian matter distribution. | |
133 | SetMSTP(82,4); | |
134 | SetPARP(83,0.5); | |
135 | SetPARP(84,0.4); | |
136 | // pT0. | |
137 | SetPARP(82,2.0); | |
138 | // Reference energy for pT0 and energy rescaling pace. | |
139 | SetPARP(89,1800); | |
140 | SetPARP(90,0.25); | |
141 | // String drawing almost completely minimizes string length. | |
142 | SetPARP(85,0.9); | |
143 | SetPARP(86,0.95); | |
144 | // ISR and FSR activity. | |
145 | SetPARP(67,4); | |
146 | SetPARP(71,4); | |
147 | // Lambda_FSR scale. | |
148 | SetPARJ(81,0.29); | |
149 | break; | |
150 | case kPyOldUEQ2ordered2: | |
151 | // Old underlying events with Q2 ordered QCD processes | |
152 | // Multiple interactions on. | |
153 | SetMSTP(81,1); | |
154 | // Double Gaussian matter distribution. | |
155 | SetMSTP(82,4); | |
156 | SetPARP(83,0.5); | |
157 | SetPARP(84,0.4); | |
158 | // pT0. | |
159 | SetPARP(82,2.0); | |
160 | // Reference energy for pT0 and energy rescaling pace. | |
161 | SetPARP(89,1800); | |
162 | SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered | |
163 | // String drawing almost completely minimizes string length. | |
164 | SetPARP(85,0.9); | |
165 | SetPARP(86,0.95); | |
166 | // ISR and FSR activity. | |
167 | SetPARP(67,4); | |
168 | SetPARP(71,4); | |
169 | // Lambda_FSR scale. | |
170 | SetPARJ(81,0.29); | |
171 | break; | |
172 | case kPyOldPopcorn: | |
173 | // Old production mechanism: Old Popcorn | |
174 | SetMSEL(1); | |
175 | SetMSTJ(12,3); | |
176 | // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon | |
177 | SetMSTP(88,2); | |
178 | // (D=1)see can be used to form baryons (BARYON JUNCTION) | |
179 | SetMSTJ(1,1); | |
e0e89f40 | 180 | AtlasTuning(); |
65f2626c | 181 | break; |
8d2cd130 | 182 | case kPyCharm: |
183 | SetMSEL(4); | |
8d2cd130 | 184 | // heavy quark masses |
185 | ||
186 | SetPMAS(4,1,1.2); | |
8d2cd130 | 187 | // |
188 | // primordial pT | |
189 | SetMSTP(91,1); | |
190 | SetPARP(91,1.); | |
191 | SetPARP(93,5.); | |
192 | // | |
193 | break; | |
194 | case kPyBeauty: | |
195 | SetMSEL(5); | |
196 | SetPMAS(5,1,4.75); | |
8d2cd130 | 197 | break; |
198 | case kPyJpsi: | |
199 | SetMSEL(0); | |
200 | // gg->J/Psi g | |
201 | SetMSUB(86,1); | |
202 | break; | |
203 | case kPyJpsiChi: | |
204 | SetMSEL(0); | |
205 | // gg->J/Psi g | |
206 | SetMSUB(86,1); | |
207 | // gg-> chi_0c g | |
208 | SetMSUB(87,1); | |
209 | // gg-> chi_1c g | |
210 | SetMSUB(88,1); | |
211 | // gg-> chi_2c g | |
212 | SetMSUB(89,1); | |
213 | break; | |
214 | case kPyCharmUnforced: | |
215 | SetMSEL(0); | |
216 | // gq->qg | |
217 | SetMSUB(28,1); | |
218 | // gg->qq | |
219 | SetMSUB(53,1); | |
220 | // gg->gg | |
221 | SetMSUB(68,1); | |
222 | break; | |
223 | case kPyBeautyUnforced: | |
224 | SetMSEL(0); | |
225 | // gq->qg | |
226 | SetMSUB(28,1); | |
227 | // gg->qq | |
228 | SetMSUB(53,1); | |
229 | // gg->gg | |
230 | SetMSUB(68,1); | |
231 | break; | |
232 | case kPyMb: | |
233 | // Minimum Bias pp-Collisions | |
234 | // | |
235 | // | |
236 | // select Pythia min. bias model | |
237 | SetMSEL(0); | |
511db649 | 238 | SetMSUB(92,1); // single diffraction AB-->XB |
239 | SetMSUB(93,1); // single diffraction AB-->AX | |
240 | SetMSUB(94,1); // double diffraction | |
241 | SetMSUB(95,1); // low pt production | |
242 | ||
e0e89f40 | 243 | AtlasTuning(); |
f529e69b | 244 | break; |
245 | case kPyMbDefault: | |
246 | // Minimum Bias pp-Collisions | |
247 | // | |
248 | // | |
249 | // select Pythia min. bias model | |
250 | SetMSEL(0); | |
251 | SetMSUB(92,1); // single diffraction AB-->XB | |
252 | SetMSUB(93,1); // single diffraction AB-->AX | |
253 | SetMSUB(94,1); // double diffraction | |
254 | SetMSUB(95,1); // low pt production | |
255 | ||
0a0cbcfd | 256 | break; |
257 | case kPyLhwgMb: | |
258 | // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120 | |
259 | // -> Pythia 6.3 or above is needed | |
260 | // | |
261 | SetMSEL(0); | |
262 | SetMSUB(92,1); // single diffraction AB-->XB | |
263 | SetMSUB(93,1); // single diffraction AB-->AX | |
264 | SetMSUB(94,1); // double diffraction | |
265 | SetMSUB(95,1); // low pt production | |
266 | ||
267 | SetMSTP(51,kCTEQ6ll); // CTEQ6ll pdf | |
268 | SetMSTP(52,2); | |
269 | SetMSTP(68,1); | |
270 | SetMSTP(70,2); | |
271 | SetMSTP(81,1); // Multiple Interactions ON | |
272 | SetMSTP(82,4); // Double Gaussian Model | |
273 | SetMSTP(88,1); | |
274 | ||
275 | SetPARP(82,2.3); // [GeV] PT_min at Ref. energy | |
276 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
277 | SetPARP(84,0.5); // Core radius | |
278 | SetPARP(85,0.9); // Regulates gluon prod. mechanism | |
279 | SetPARP(90,0.2); // 2*epsilon (exponent in power law) | |
280 | ||
511db649 | 281 | break; |
8d2cd130 | 282 | case kPyMbNonDiffr: |
283 | // Minimum Bias pp-Collisions | |
284 | // | |
285 | // | |
286 | // select Pythia min. bias model | |
287 | SetMSEL(0); | |
511db649 | 288 | SetMSUB(95,1); // low pt production |
0f482ae4 | 289 | |
d7de4a67 | 290 | AtlasTuning(); |
291 | break; | |
292 | case kPyMbMSEL1: | |
293 | ConfigHeavyFlavor(); | |
294 | // Intrinsic <kT^2> | |
295 | SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons | |
296 | SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2 | |
297 | SetPARP(93,5.); // Upper cut-off | |
298 | // Set Q-quark mass | |
299 | SetPMAS(4,1,1.2); // Charm quark mass | |
300 | SetPMAS(5,1,4.78); // Beauty quark mass | |
301 | SetPARP(71,4.); // Defaut value | |
302 | // Atlas Tuning | |
e0e89f40 | 303 | AtlasTuning(); |
8d2cd130 | 304 | break; |
305 | case kPyJets: | |
306 | // | |
307 | // QCD Jets | |
308 | // | |
309 | SetMSEL(1); | |
65f2626c | 310 | // Pythia Tune A (CDF) |
311 | // | |
312 | SetPARP(67,4.); // Regulates Initial State Radiation | |
313 | SetMSTP(82,4); // Double Gaussian Model | |
314 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy | |
315 | SetPARP(84,0.4); // Core radius | |
316 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism | |
317 | SetPARP(86,0.95); // Regulates gluon prod. mechanism | |
318 | SetPARP(89,1800.); // [GeV] Ref. energy | |
319 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) | |
320 | break; | |
8d2cd130 | 321 | case kPyDirectGamma: |
322 | SetMSEL(10); | |
323 | break; | |
adf4d898 | 324 | case kPyCharmPbPbMNR: |
325 | case kPyD0PbPbMNR: | |
90d7b703 | 326 | case kPyDPlusPbPbMNR: |
e0e89f40 | 327 | case kPyDPlusStrangePbPbMNR: |
90d7b703 | 328 | // Tuning of Pythia parameters aimed to get a resonable agreement |
329 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
330 | // c-cbar single inclusive and double differential distributions. | |
331 | // This parameter settings are meant to work with Pb-Pb collisions | |
332 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
333 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
334 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 335 | ConfigHeavyFlavor(); |
90d7b703 | 336 | // Intrinsic <kT> |
337 | SetMSTP(91,1); | |
338 | SetPARP(91,1.304); | |
339 | SetPARP(93,6.52); | |
90d7b703 | 340 | // Set c-quark mass |
341 | SetPMAS(4,1,1.2); | |
8d2cd130 | 342 | break; |
adf4d898 | 343 | case kPyCharmpPbMNR: |
344 | case kPyD0pPbMNR: | |
90d7b703 | 345 | case kPyDPluspPbMNR: |
e0e89f40 | 346 | case kPyDPlusStrangepPbMNR: |
90d7b703 | 347 | // Tuning of Pythia parameters aimed to get a resonable agreement |
348 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
349 | // c-cbar single inclusive and double differential distributions. | |
350 | // This parameter settings are meant to work with p-Pb collisions | |
351 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
352 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
353 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 354 | ConfigHeavyFlavor(); |
90d7b703 | 355 | // Intrinsic <kT> |
3dc3ec94 | 356 | SetMSTP(91,1); |
357 | SetPARP(91,1.16); | |
358 | SetPARP(93,5.8); | |
359 | ||
90d7b703 | 360 | // Set c-quark mass |
3dc3ec94 | 361 | SetPMAS(4,1,1.2); |
adf4d898 | 362 | break; |
363 | case kPyCharmppMNR: | |
364 | case kPyD0ppMNR: | |
90d7b703 | 365 | case kPyDPlusppMNR: |
e0e89f40 | 366 | case kPyDPlusStrangeppMNR: |
90d7b703 | 367 | // Tuning of Pythia parameters aimed to get a resonable agreement |
368 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
369 | // c-cbar single inclusive and double differential distributions. | |
370 | // This parameter settings are meant to work with pp collisions | |
371 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
372 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
373 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 374 | ConfigHeavyFlavor(); |
90d7b703 | 375 | // Intrinsic <kT^2> |
3dc3ec94 | 376 | SetMSTP(91,1); |
377 | SetPARP(91,1.); | |
378 | SetPARP(93,5.); | |
379 | ||
90d7b703 | 380 | // Set c-quark mass |
3dc3ec94 | 381 | SetPMAS(4,1,1.2); |
adf4d898 | 382 | break; |
e0e89f40 | 383 | case kPyCharmppMNRwmi: |
384 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
385 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
386 | // c-cbar single inclusive and double differential distributions. | |
387 | // This parameter settings are meant to work with pp collisions | |
388 | // and with kCTEQ5L PDFs. | |
389 | // Added multiple interactions according to ATLAS tune settings. | |
390 | // To get a "reasonable" agreement with MNR results, events have to be | |
391 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
392 | // set to 2.76 GeV. | |
393 | // To get a "perfect" agreement with MNR results, events have to be | |
394 | // generated in four ptHard bins with the following relative | |
395 | // normalizations: | |
396 | // 2.76-3 GeV: 25% | |
397 | // 3-4 GeV: 40% | |
398 | // 4-8 GeV: 29% | |
399 | // >8 GeV: 6% | |
400 | ConfigHeavyFlavor(); | |
401 | // Intrinsic <kT^2> | |
402 | SetMSTP(91,1); | |
403 | SetPARP(91,1.); | |
404 | SetPARP(93,5.); | |
405 | ||
406 | // Set c-quark mass | |
407 | SetPMAS(4,1,1.2); | |
408 | AtlasTuning(); | |
409 | break; | |
adf4d898 | 410 | case kPyBeautyPbPbMNR: |
8d2cd130 | 411 | // Tuning of Pythia parameters aimed to get a resonable agreement |
412 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
413 | // b-bbar single inclusive and double differential distributions. | |
414 | // This parameter settings are meant to work with Pb-Pb collisions | |
415 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
416 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
417 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 418 | ConfigHeavyFlavor(); |
8d2cd130 | 419 | // QCD scales |
3dc3ec94 | 420 | SetPARP(67,1.0); |
421 | SetPARP(71,1.0); | |
adf4d898 | 422 | // Intrinsic <kT> |
3dc3ec94 | 423 | SetMSTP(91,1); |
424 | SetPARP(91,2.035); | |
425 | SetPARP(93,10.17); | |
8d2cd130 | 426 | // Set b-quark mass |
3dc3ec94 | 427 | SetPMAS(5,1,4.75); |
adf4d898 | 428 | break; |
429 | case kPyBeautypPbMNR: | |
430 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
431 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
432 | // b-bbar single inclusive and double differential distributions. | |
433 | // This parameter settings are meant to work with p-Pb collisions | |
434 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
435 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
436 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 437 | ConfigHeavyFlavor(); |
adf4d898 | 438 | // QCD scales |
3dc3ec94 | 439 | SetPARP(67,1.0); |
440 | SetPARP(71,1.0); | |
adf4d898 | 441 | // Intrinsic <kT> |
3dc3ec94 | 442 | SetMSTP(91,1); |
443 | SetPARP(91,1.60); | |
444 | SetPARP(93,8.00); | |
adf4d898 | 445 | // Set b-quark mass |
3dc3ec94 | 446 | SetPMAS(5,1,4.75); |
adf4d898 | 447 | break; |
448 | case kPyBeautyppMNR: | |
449 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
450 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
451 | // b-bbar single inclusive and double differential distributions. | |
452 | // This parameter settings are meant to work with pp collisions | |
453 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
454 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
455 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 456 | ConfigHeavyFlavor(); |
adf4d898 | 457 | // QCD scales |
3dc3ec94 | 458 | SetPARP(67,1.0); |
459 | SetPARP(71,1.0); | |
460 | ||
461 | // Intrinsic <kT> | |
462 | SetMSTP(91,1); | |
463 | SetPARP(91,1.); | |
464 | SetPARP(93,5.); | |
465 | ||
466 | // Set b-quark mass | |
467 | SetPMAS(5,1,4.75); | |
8d2cd130 | 468 | break; |
e0e89f40 | 469 | case kPyBeautyppMNRwmi: |
470 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
471 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
472 | // b-bbar single inclusive and double differential distributions. | |
473 | // This parameter settings are meant to work with pp collisions | |
474 | // and with kCTEQ5L PDFs. | |
475 | // Added multiple interactions according to ATLAS tune settings. | |
476 | // To get a "reasonable" agreement with MNR results, events have to be | |
477 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
478 | // set to 2.76 GeV. | |
479 | // To get a "perfect" agreement with MNR results, events have to be | |
480 | // generated in four ptHard bins with the following relative | |
481 | // normalizations: | |
482 | // 2.76-4 GeV: 5% | |
483 | // 4-6 GeV: 31% | |
484 | // 6-8 GeV: 28% | |
485 | // >8 GeV: 36% | |
486 | ConfigHeavyFlavor(); | |
487 | // QCD scales | |
488 | SetPARP(67,1.0); | |
489 | SetPARP(71,1.0); | |
490 | ||
491 | // Intrinsic <kT> | |
492 | SetMSTP(91,1); | |
493 | SetPARP(91,1.); | |
494 | SetPARP(93,5.); | |
495 | ||
496 | // Set b-quark mass | |
497 | SetPMAS(5,1,4.75); | |
498 | ||
499 | AtlasTuning(); | |
500 | break; | |
589380c6 | 501 | case kPyW: |
502 | ||
503 | //Inclusive production of W+/- | |
504 | SetMSEL(0); | |
505 | //f fbar -> W+ | |
506 | SetMSUB(2,1); | |
507 | // //f fbar -> g W+ | |
508 | // SetMSUB(16,1); | |
509 | // //f fbar -> gamma W+ | |
510 | // SetMSUB(20,1); | |
511 | // //f g -> f W+ | |
512 | // SetMSUB(31,1); | |
513 | // //f gamma -> f W+ | |
514 | // SetMSUB(36,1); | |
515 | ||
516 | // Initial/final parton shower on (Pythia default) | |
517 | // With parton showers on we are generating "W inclusive process" | |
518 | SetMSTP(61,1); //Initial QCD & QED showers on | |
519 | SetMSTP(71,1); //Final QCD & QED showers on | |
520 | ||
521 | break; | |
0f6ee828 | 522 | |
523 | case kPyZ: | |
524 | ||
525 | //Inclusive production of Z | |
526 | SetMSEL(0); | |
527 | //f fbar -> Z/gamma | |
528 | SetMSUB(1,1); | |
529 | ||
530 | // // f fbar -> g Z/gamma | |
531 | // SetMSUB(15,1); | |
532 | // // f fbar -> gamma Z/gamma | |
533 | // SetMSUB(19,1); | |
534 | // // f g -> f Z/gamma | |
535 | // SetMSUB(30,1); | |
536 | // // f gamma -> f Z/gamma | |
537 | // SetMSUB(35,1); | |
538 | ||
539 | //only Z included, not gamma | |
540 | SetMSTP(43,2); | |
541 | ||
542 | // Initial/final parton shower on (Pythia default) | |
543 | // With parton showers on we are generating "Z inclusive process" | |
544 | SetMSTP(61,1); //Initial QCD & QED showers on | |
545 | SetMSTP(71,1); //Final QCD & QED showers on | |
546 | ||
547 | break; | |
548 | ||
8d2cd130 | 549 | } |
550 | // | |
551 | // Initialize PYTHIA | |
552 | SetMSTP(41,1); // all resonance decays switched on | |
553 | ||
554 | Initialize("CMS","p","p",fEcms); | |
555 | ||
556 | } | |
557 | ||
558 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
559 | { | |
560 | // Check Lund particle code (for debugging) | |
561 | Int_t kc=Pycomp(kf); | |
562 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
563 | return kc; | |
564 | } | |
565 | ||
566 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) | |
567 | { | |
568 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
569 | // The MSTP array in the PYPARS common block is used to enable and | |
570 | // select the nuclear structure functions. | |
571 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
572 | // =1: internal PYTHIA acording to MSTP(51) | |
573 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
574 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
575 | // MSTP(192) : Mass number of nucleus side 1 | |
576 | // MSTP(193) : Mass number of nucleus side 2 | |
577 | SetMSTP(52,2); | |
578 | SetMSTP(192, a1); | |
579 | SetMSTP(193, a2); | |
580 | } | |
581 | ||
582 | ||
583 | AliPythia* AliPythia::Instance() | |
584 | { | |
585 | // Set random number generator | |
586 | if (fgAliPythia) { | |
587 | return fgAliPythia; | |
588 | } else { | |
589 | fgAliPythia = new AliPythia(); | |
590 | return fgAliPythia; | |
591 | } | |
592 | } | |
593 | ||
594 | void AliPythia::PrintParticles() | |
595 | { | |
596 | // Print list of particl properties | |
597 | Int_t np = 0; | |
c31f1d37 | 598 | char* name = new char[16]; |
8d2cd130 | 599 | for (Int_t kf=0; kf<1000000; kf++) { |
600 | for (Int_t c = 1; c > -2; c-=2) { | |
8d2cd130 | 601 | Int_t kc = Pycomp(c*kf); |
602 | if (kc) { | |
603 | Float_t mass = GetPMAS(kc,1); | |
604 | Float_t width = GetPMAS(kc,2); | |
605 | Float_t tau = GetPMAS(kc,4); | |
c31f1d37 | 606 | |
8d2cd130 | 607 | Pyname(kf,name); |
608 | ||
609 | np++; | |
610 | ||
611 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
612 | c*kf, name, mass, width, tau); | |
613 | } | |
614 | } | |
615 | } | |
616 | printf("\n Number of particles %d \n \n", np); | |
617 | } | |
618 | ||
619 | void AliPythia::ResetDecayTable() | |
620 | { | |
621 | // Set default values for pythia decay switches | |
622 | Int_t i; | |
623 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
624 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
625 | } | |
626 | ||
627 | void AliPythia::SetDecayTable() | |
628 | { | |
629 | // Set default values for pythia decay switches | |
630 | // | |
631 | Int_t i; | |
632 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
633 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
634 | } | |
635 | ||
636 | void AliPythia::Pyclus(Int_t& njet) | |
637 | { | |
638 | // Call Pythia clustering algorithm | |
639 | // | |
640 | pyclus(njet); | |
641 | } | |
642 | ||
643 | void AliPythia::Pycell(Int_t& njet) | |
644 | { | |
645 | // Call Pythia jet reconstruction algorithm | |
646 | // | |
647 | pycell(njet); | |
648 | } | |
649 | ||
452af8c7 | 650 | void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) |
651 | { | |
652 | // Call Pythia jet reconstruction algorithm | |
653 | // | |
452af8c7 | 654 | pyshow(ip1, ip2, qmax); |
655 | } | |
656 | ||
657 | void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) | |
658 | { | |
659 | pyrobo(imi, ima, the, phi, bex, bey, bez); | |
660 | } | |
661 | ||
662 | ||
663 | ||
32c8e463 | 664 | void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax) |
0f482ae4 | 665 | { |
666 | // Initializes | |
667 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann | |
668 | // (2) The nuclear geometry using the Glauber Model | |
669 | // | |
6b435cde | 670 | |
0f482ae4 | 671 | fGlauber = new AliFastGlauber(); |
672 | fGlauber->Init(2); | |
673 | fGlauber->SetCentralityClass(cMin, cMax); | |
674 | ||
675 | fQuenchingWeights = new AliQuenchingWeights(); | |
676 | fQuenchingWeights->InitMult(); | |
86b6ad68 | 677 | fQuenchingWeights->SetK(k); |
0f482ae4 | 678 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); |
32c8e463 | 679 | fNGmax = ngmax; |
680 | fZmax = zmax; | |
681 | ||
0f482ae4 | 682 | } |
683 | ||
684 | ||
452af8c7 | 685 | void AliPythia::Quench() |
686 | { | |
687 | // | |
688 | // | |
689 | // Simple Jet Quenching routine: | |
690 | // ============================= | |
691 | // The jet formed by all final state partons radiated by the parton created | |
0f482ae4 | 692 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in |
693 | // the initial parton reference frame: | |
452af8c7 | 694 | // (E + p_z)new = (1-z) (E + p_z)old |
695 | // | |
0f482ae4 | 696 | // |
697 | // | |
698 | // | |
452af8c7 | 699 | // The lost momentum is first balanced by one gluon with virtuality > 0. |
700 | // Subsequently the gluon splits to yield two gluons with E = p. | |
701 | // | |
0f482ae4 | 702 | // |
703 | // | |
4e383037 | 704 | static Float_t eMean = 0.; |
705 | static Int_t icall = 0; | |
0f482ae4 | 706 | |
c2c598a3 | 707 | Double_t p0[4][5]; |
708 | Double_t p1[4][5]; | |
709 | Double_t p2[4][5]; | |
710 | Int_t klast[4] = {-1, -1, -1, -1}; | |
452af8c7 | 711 | |
712 | Int_t numpart = fPyjets->N; | |
86b6ad68 | 713 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; |
c2c598a3 | 714 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; |
715 | Bool_t quenched[4]; | |
b280c4cc | 716 | Double_t wjtKick[4]; |
c2c598a3 | 717 | Int_t nGluon[4]; |
86b6ad68 | 718 | Int_t qPdg[4]; |
0f482ae4 | 719 | Int_t imo, kst, pdg; |
b280c4cc | 720 | |
511db649 | 721 | // |
c2c598a3 | 722 | // Sore information about Primary partons |
723 | // | |
724 | // j = | |
725 | // 0, 1 partons from hard scattering | |
726 | // 2, 3 partons from initial state radiation | |
727 | // | |
728 | for (Int_t i = 2; i <= 7; i++) { | |
729 | Int_t j = 0; | |
730 | // Skip gluons that participate in hard scattering | |
731 | if (i == 4 || i == 5) continue; | |
732 | // Gluons from hard Scattering | |
733 | if (i == 6 || i == 7) { | |
734 | j = i - 6; | |
735 | pxq[j] = fPyjets->P[0][i]; | |
736 | pyq[j] = fPyjets->P[1][i]; | |
737 | pzq[j] = fPyjets->P[2][i]; | |
738 | eq[j] = fPyjets->P[3][i]; | |
739 | mq[j] = fPyjets->P[4][i]; | |
740 | } else { | |
741 | // Gluons from initial state radiation | |
742 | // | |
743 | // Obtain 4-momentum vector from difference between original parton and parton after gluon | |
744 | // radiation. Energy is calculated independently because initial state radition does not | |
745 | // conserve strictly momentum and energy for each partonic system independently. | |
746 | // | |
747 | // Not very clean. Should be improved ! | |
748 | // | |
749 | // | |
750 | j = i; | |
751 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; | |
752 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; | |
753 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; | |
754 | mq[j] = fPyjets->P[4][i]; | |
755 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); | |
756 | } | |
757 | // | |
758 | // Calculate some kinematic variables | |
511db649 | 759 | // |
4e383037 | 760 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); |
0f482ae4 | 761 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); |
762 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); | |
763 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); | |
764 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); | |
86b6ad68 | 765 | qPdg[j] = fPyjets->K[1][i]; |
766 | } | |
767 | ||
768 | Double_t int0[4]; | |
769 | Double_t int1[4]; | |
86b6ad68 | 770 | |
b280c4cc | 771 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); |
772 | ||
86b6ad68 | 773 | for (Int_t j = 0; j < 4; j++) { |
c2c598a3 | 774 | // |
775 | // Quench only central jets and with E > 10. | |
776 | // | |
86b6ad68 | 777 | |
778 | ||
779 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; | |
780 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); | |
781 | ||
c2c598a3 | 782 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { |
b280c4cc | 783 | fZQuench[j] = 0.; |
0f482ae4 | 784 | } else { |
c2c598a3 | 785 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { |
4e383037 | 786 | icall ++; |
787 | eMean += eloss; | |
788 | } | |
0f482ae4 | 789 | // |
790 | // Extra pt | |
86b6ad68 | 791 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); |
792 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); | |
0f482ae4 | 793 | // |
794 | // Fractional energy loss | |
b280c4cc | 795 | fZQuench[j] = eloss / eq[j]; |
0f482ae4 | 796 | // |
797 | // Avoid complete loss | |
798 | // | |
32c8e463 | 799 | if (fZQuench[j] == 1.) fZQuench[j] = fZmax; |
0f482ae4 | 800 | // |
801 | // Some debug printing | |
86b6ad68 | 802 | |
803 | ||
bf9bb016 | 804 | // 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", |
805 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); | |
4e383037 | 806 | |
b280c4cc | 807 | // fZQuench[j] = 0.8; |
808 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); | |
0f482ae4 | 809 | } |
4e383037 | 810 | |
b280c4cc | 811 | quenched[j] = (fZQuench[j] > 0.01); |
4e383037 | 812 | } // primary partons |
c2c598a3 | 813 | |
b280c4cc | 814 | |
815 | ||
6e90ad26 | 816 | Double_t pNew[1000][4]; |
817 | Int_t kNew[1000]; | |
818 | Int_t icount = 0; | |
b280c4cc | 819 | Double_t zquench[4]; |
820 | ||
6e90ad26 | 821 | // |
4e383037 | 822 | // System Loop |
c2c598a3 | 823 | for (Int_t isys = 0; isys < 4; isys++) { |
6e90ad26 | 824 | // Skip to next system if not quenched. |
4e383037 | 825 | if (!quenched[isys]) continue; |
826 | ||
b280c4cc | 827 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); |
32c8e463 | 828 | if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax; |
b280c4cc | 829 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); |
4e383037 | 830 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); |
0f482ae4 | 831 | |
4e383037 | 832 | |
833 | ||
834 | Int_t igMin = -1; | |
835 | Int_t igMax = -1; | |
836 | Double_t pg[4] = {0., 0., 0., 0.}; | |
837 | ||
838 | // | |
839 | // Loop on radiation events | |
840 | ||
841 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { | |
6e90ad26 | 842 | while (1) { |
843 | icount = 0; | |
844 | for (Int_t k = 0; k < 4; k++) | |
845 | { | |
846 | p0[isys][k] = 0.; | |
847 | p1[isys][k] = 0.; | |
848 | p2[isys][k] = 0.; | |
849 | } | |
850 | // Loop over partons | |
851 | for (Int_t i = 0; i < numpart; i++) | |
852 | { | |
853 | imo = fPyjets->K[2][i]; | |
854 | kst = fPyjets->K[0][i]; | |
855 | pdg = fPyjets->K[1][i]; | |
856 | ||
857 | ||
858 | ||
0f482ae4 | 859 | // Quarks and gluons only |
6e90ad26 | 860 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; |
0f482ae4 | 861 | // Particles from hard scattering only |
c2c598a3 | 862 | |
6e90ad26 | 863 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; |
c2c598a3 | 864 | Int_t imom = imo % 1000; |
865 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; | |
866 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; | |
867 | ||
6e90ad26 | 868 | |
0f482ae4 | 869 | // Skip comment lines |
6e90ad26 | 870 | if (kst != 1 && kst != 2) continue; |
0f482ae4 | 871 | // |
872 | // Parton kinematic | |
6e90ad26 | 873 | px = fPyjets->P[0][i]; |
874 | py = fPyjets->P[1][i]; | |
875 | pz = fPyjets->P[2][i]; | |
876 | e = fPyjets->P[3][i]; | |
877 | m = fPyjets->P[4][i]; | |
878 | pt = TMath::Sqrt(px * px + py * py); | |
879 | p = TMath::Sqrt(px * px + py * py + pz * pz); | |
880 | phi = TMath::Pi() + TMath::ATan2(-py, -px); | |
881 | theta = TMath::ATan2(pt, pz); | |
882 | ||
0f482ae4 | 883 | // |
c2c598a3 | 884 | // Save 4-momentum sum for balancing |
885 | Int_t index = isys; | |
6e90ad26 | 886 | |
887 | p0[index][0] += px; | |
888 | p0[index][1] += py; | |
889 | p0[index][2] += pz; | |
890 | p0[index][3] += e; | |
6e90ad26 | 891 | |
892 | klast[index] = i; | |
893 | ||
0f482ae4 | 894 | // |
895 | // Fractional energy loss | |
b280c4cc | 896 | Double_t z = zquench[index]; |
4e383037 | 897 | |
c2c598a3 | 898 | |
4e383037 | 899 | // Don't fully quench radiated gluons |
900 | // | |
901 | if (imo > 1000) { | |
902 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination | |
903 | // | |
904 | ||
c2c598a3 | 905 | z = 0.02; |
4e383037 | 906 | } |
c2c598a3 | 907 | // printf("z: %d %f\n", imo, z); |
908 | ||
4e383037 | 909 | |
910 | // | |
6e90ad26 | 911 | |
912 | // | |
913 | // | |
914 | // Transform into frame in which initial parton is along z-axis | |
915 | // | |
916 | TVector3 v(px, py, pz); | |
917 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); | |
918 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); | |
919 | ||
920 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); | |
921 | Double_t mt2 = jt * jt + m * m; | |
922 | Double_t zmax = 1.; | |
923 | // | |
924 | // Kinematic limit on z | |
925 | // | |
4e383037 | 926 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); |
6e90ad26 | 927 | // |
928 | // Change light-cone kinematics rel. to initial parton | |
929 | // | |
930 | Double_t eppzOld = e + pl; | |
931 | Double_t empzOld = e - pl; | |
932 | ||
933 | Double_t eppzNew = (1. - z) * eppzOld; | |
934 | Double_t empzNew = empzOld - mt2 * z / eppzOld; | |
935 | Double_t eNew = 0.5 * (eppzNew + empzNew); | |
936 | Double_t plNew = 0.5 * (eppzNew - empzNew); | |
937 | ||
938 | Double_t jtNew; | |
939 | // | |
940 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 | |
941 | Double_t mt2New = eppzNew * empzNew; | |
942 | if (mt2New < 1.e-8) mt2New = 0.; | |
4e383037 | 943 | if (z < zmax) { |
944 | if (m * m > mt2New) { | |
945 | // | |
946 | // This should not happen | |
947 | // | |
948 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); | |
949 | jtNew = 0; | |
950 | } else { | |
951 | jtNew = TMath::Sqrt(mt2New - m * m); | |
952 | } | |
6e90ad26 | 953 | } else { |
4e383037 | 954 | // If pT is to small (probably a leading massive particle) we scale only the energy |
955 | // This can cause negative masses of the radiated gluon | |
956 | // Let's hope for the best ... | |
957 | jtNew = jt; | |
958 | eNew = TMath::Sqrt(plNew * plNew + mt2); | |
959 | ||
6e90ad26 | 960 | } |
6e90ad26 | 961 | // |
962 | // Calculate new px, py | |
963 | // | |
964 | Double_t pxNew = jtNew / jt * pxs; | |
965 | Double_t pyNew = jtNew / jt * pys; | |
966 | ||
967 | // Double_t dpx = pxs - pxNew; | |
968 | // Double_t dpy = pys - pyNew; | |
969 | // Double_t dpz = pl - plNew; | |
970 | // Double_t de = e - eNew; | |
971 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; | |
972 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); | |
973 | // printf("New mass (2) %e %e \n", pxNew, pyNew); | |
974 | // | |
975 | // Rotate back | |
976 | // | |
977 | TVector3 w(pxNew, pyNew, plNew); | |
978 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); | |
979 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); | |
980 | ||
981 | p1[index][0] += pxNew; | |
982 | p1[index][1] += pyNew; | |
983 | p1[index][2] += plNew; | |
984 | p1[index][3] += eNew; | |
985 | // | |
986 | // Updated 4-momentum vectors | |
987 | // | |
988 | pNew[icount][0] = pxNew; | |
989 | pNew[icount][1] = pyNew; | |
990 | pNew[icount][2] = plNew; | |
991 | pNew[icount][3] = eNew; | |
992 | kNew[icount] = i; | |
993 | icount++; | |
994 | } // parton loop | |
0f482ae4 | 995 | // |
6e90ad26 | 996 | // Check if there was phase-space for quenching |
0f482ae4 | 997 | // |
0f482ae4 | 998 | |
6e90ad26 | 999 | if (icount == 0) quenched[isys] = kFALSE; |
1000 | if (!quenched[isys]) break; | |
1001 | ||
1002 | for (Int_t j = 0; j < 4; j++) | |
1003 | { | |
1004 | p2[isys][j] = p0[isys][j] - p1[isys][j]; | |
1005 | } | |
1006 | 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 | 1007 | if (p2[isys][4] > 0.) { |
1008 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); | |
1009 | break; | |
1010 | } else { | |
b280c4cc | 1011 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); |
4e383037 | 1012 | 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 | 1013 | if (p2[isys][4] < -0.01) { |
4e383037 | 1014 | printf("Negative mass squared !\n"); |
1015 | // Here we have to put the gluon back to mass shell | |
1016 | // This will lead to a small energy imbalance | |
1017 | p2[isys][4] = 0.; | |
1018 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); | |
1019 | break; | |
6e90ad26 | 1020 | } else { |
1021 | p2[isys][4] = 0.; | |
1022 | break; | |
1023 | } | |
1024 | } | |
6e90ad26 | 1025 | /* |
6e90ad26 | 1026 | zHeavy *= 0.98; |
1027 | printf("zHeavy lowered to %f\n", zHeavy); | |
1028 | if (zHeavy < 0.01) { | |
1029 | printf("No success ! \n"); | |
1030 | icount = 0; | |
1031 | quenched[isys] = kFALSE; | |
1032 | break; | |
1033 | } | |
4e383037 | 1034 | */ |
1035 | } // iteration on z (while) | |
1036 | ||
6e90ad26 | 1037 | // Update event record |
1038 | for (Int_t k = 0; k < icount; k++) { | |
1039 | // 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] ); | |
1040 | fPyjets->P[0][kNew[k]] = pNew[k][0]; | |
1041 | fPyjets->P[1][kNew[k]] = pNew[k][1]; | |
1042 | fPyjets->P[2][kNew[k]] = pNew[k][2]; | |
1043 | fPyjets->P[3][kNew[k]] = pNew[k][3]; | |
0f482ae4 | 1044 | } |
4e383037 | 1045 | // |
1046 | // Add the gluons | |
1047 | // | |
1048 | Int_t ish = 0; | |
1837e95c | 1049 | Int_t iGlu; |
4e383037 | 1050 | if (!quenched[isys]) continue; |
0f482ae4 | 1051 | // |
1052 | // Last parton from shower i | |
4e383037 | 1053 | Int_t in = klast[isys]; |
0f482ae4 | 1054 | // |
1055 | // Continue if no parton in shower i selected | |
1056 | if (in == -1) continue; | |
1057 | // | |
1058 | // If this is the second initial parton and it is behind the first move pointer by previous ish | |
4e383037 | 1059 | if (isys == 1 && klast[1] > klast[0]) in += ish; |
0f482ae4 | 1060 | // |
1061 | // Starting index | |
452af8c7 | 1062 | |
4e383037 | 1063 | // jmin = in - 1; |
0f482ae4 | 1064 | // How many additional gluons will be generated |
1065 | ish = 1; | |
4e383037 | 1066 | if (p2[isys][4] > 0.05) ish = 2; |
0f482ae4 | 1067 | // |
1068 | // Position of gluons | |
4e383037 | 1069 | iGlu = numpart; |
1070 | if (iglu == 0) igMin = iGlu; | |
1071 | igMax = iGlu; | |
0f482ae4 | 1072 | numpart += ish; |
1073 | (fPyjets->N) += ish; | |
4e383037 | 1074 | |
0f482ae4 | 1075 | if (ish == 1) { |
4e383037 | 1076 | fPyjets->P[0][iGlu] = p2[isys][0]; |
1077 | fPyjets->P[1][iGlu] = p2[isys][1]; | |
1078 | fPyjets->P[2][iGlu] = p2[isys][2]; | |
1079 | fPyjets->P[3][iGlu] = p2[isys][3]; | |
1080 | fPyjets->P[4][iGlu] = p2[isys][4]; | |
0f482ae4 | 1081 | |
4e383037 | 1082 | fPyjets->K[0][iGlu] = 1; |
1083 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; | |
0f482ae4 | 1084 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1085 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1086 | fPyjets->K[3][iGlu] = -1; |
1087 | fPyjets->K[4][iGlu] = -1; | |
4e383037 | 1088 | |
1089 | pg[0] += p2[isys][0]; | |
1090 | pg[1] += p2[isys][1]; | |
1091 | pg[2] += p2[isys][2]; | |
1092 | pg[3] += p2[isys][3]; | |
0f482ae4 | 1093 | } else { |
1094 | // | |
1095 | // Split gluon in rest frame. | |
1096 | // | |
4e383037 | 1097 | Double_t bx = p2[isys][0] / p2[isys][3]; |
1098 | Double_t by = p2[isys][1] / p2[isys][3]; | |
1099 | Double_t bz = p2[isys][2] / p2[isys][3]; | |
1100 | Double_t pst = p2[isys][4] / 2.; | |
0f482ae4 | 1101 | // |
1102 | // Isotropic decay ???? | |
1103 | Double_t cost = 2. * gRandom->Rndm() - 1.; | |
1104 | Double_t sint = TMath::Sqrt(1. - cost * cost); | |
1105 | Double_t phi = 2. * TMath::Pi() * gRandom->Rndm(); | |
1106 | ||
1107 | Double_t pz1 = pst * cost; | |
1108 | Double_t pz2 = -pst * cost; | |
1109 | Double_t pt1 = pst * sint; | |
1110 | Double_t pt2 = -pst * sint; | |
1111 | Double_t px1 = pt1 * TMath::Cos(phi); | |
1112 | Double_t py1 = pt1 * TMath::Sin(phi); | |
1113 | Double_t px2 = pt2 * TMath::Cos(phi); | |
1114 | Double_t py2 = pt2 * TMath::Sin(phi); | |
1115 | ||
1116 | fPyjets->P[0][iGlu] = px1; | |
1117 | fPyjets->P[1][iGlu] = py1; | |
1118 | fPyjets->P[2][iGlu] = pz1; | |
1119 | fPyjets->P[3][iGlu] = pst; | |
1120 | fPyjets->P[4][iGlu] = 0.; | |
1121 | ||
4e383037 | 1122 | fPyjets->K[0][iGlu] = 1 ; |
0f482ae4 | 1123 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1124 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1125 | fPyjets->K[3][iGlu] = -1; |
1126 | fPyjets->K[4][iGlu] = -1; | |
1127 | ||
1128 | fPyjets->P[0][iGlu+1] = px2; | |
1129 | fPyjets->P[1][iGlu+1] = py2; | |
1130 | fPyjets->P[2][iGlu+1] = pz2; | |
1131 | fPyjets->P[3][iGlu+1] = pst; | |
1132 | fPyjets->P[4][iGlu+1] = 0.; | |
1133 | ||
4e383037 | 1134 | fPyjets->K[0][iGlu+1] = 1; |
1135 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; | |
0f482ae4 | 1136 | fPyjets->K[1][iGlu+1] = 21; |
4e383037 | 1137 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1138 | fPyjets->K[3][iGlu+1] = -1; |
1139 | fPyjets->K[4][iGlu+1] = -1; | |
1140 | SetMSTU(1,0); | |
1141 | SetMSTU(2,0); | |
1142 | // | |
1143 | // Boost back | |
1144 | // | |
1145 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); | |
1146 | } | |
4e383037 | 1147 | /* |
1148 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { | |
1149 | Double_t px, py, pz; | |
1150 | px = fPyjets->P[0][ig]; | |
1151 | py = fPyjets->P[1][ig]; | |
1152 | pz = fPyjets->P[2][ig]; | |
1153 | TVector3 v(px, py, pz); | |
1154 | v.RotateZ(-phiq[isys]); | |
1155 | v.RotateY(-thetaq[isys]); | |
1156 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); | |
1157 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1158 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); | |
1159 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); | |
1160 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1161 | pxs += jtKick * TMath::Cos(phiKick); | |
1162 | pys += jtKick * TMath::Sin(phiKick); | |
1163 | TVector3 w(pxs, pys, pzs); | |
1164 | w.RotateY(thetaq[isys]); | |
1165 | w.RotateZ(phiq[isys]); | |
1166 | fPyjets->P[0][ig] = w.X(); | |
1167 | fPyjets->P[1][ig] = w.Y(); | |
1168 | fPyjets->P[2][ig] = w.Z(); | |
1169 | fPyjets->P[2][ig] = w.Mag(); | |
1170 | } | |
1171 | */ | |
1172 | } // kGluon | |
1173 | ||
6e90ad26 | 1174 | |
4e383037 | 1175 | // Check energy conservation |
0f482ae4 | 1176 | Double_t pxs = 0.; |
1177 | Double_t pys = 0.; | |
1178 | Double_t pzs = 0.; | |
1179 | Double_t es = 14000.; | |
1180 | ||
1181 | for (Int_t i = 0; i < numpart; i++) | |
1182 | { | |
1183 | kst = fPyjets->K[0][i]; | |
1184 | if (kst != 1 && kst != 2) continue; | |
1185 | pxs += fPyjets->P[0][i]; | |
1186 | pys += fPyjets->P[1][i]; | |
1187 | pzs += fPyjets->P[2][i]; | |
1188 | es -= fPyjets->P[3][i]; | |
1189 | } | |
1190 | if (TMath::Abs(pxs) > 1.e-2 || | |
1191 | TMath::Abs(pys) > 1.e-2 || | |
1192 | TMath::Abs(pzs) > 1.e-1) { | |
1193 | printf("%e %e %e %e\n", pxs, pys, pzs, es); | |
4e383037 | 1194 | // Fatal("Quench()", "4-Momentum non-conservation"); |
452af8c7 | 1195 | } |
4e383037 | 1196 | |
1197 | } // end quenching loop (systems) | |
6e90ad26 | 1198 | // Clean-up |
0f482ae4 | 1199 | for (Int_t i = 0; i < numpart; i++) |
1200 | { | |
4e383037 | 1201 | imo = fPyjets->K[2][i]; |
1202 | if (imo > 1000) { | |
1203 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; | |
1204 | } | |
0f482ae4 | 1205 | } |
4e383037 | 1206 | // this->Pylist(1); |
0f482ae4 | 1207 | } // end quench |
90d7b703 | 1208 | |
992f2843 | 1209 | |
1210 | void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b) | |
1211 | { | |
1212 | // Igor Lokthine's quenching routine | |
1213 | pyquen(a, ibf, b); | |
1214 | } | |
b280c4cc | 1215 | |
16a82508 | 1216 | void AliPythia::Pyevnw() |
1217 | { | |
1218 | // New multiple interaction scenario | |
1219 | pyevnw(); | |
1220 | } | |
1221 | ||
b280c4cc | 1222 | void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) |
1223 | { | |
1224 | // Return event specific quenching parameters | |
1225 | xp = fXJet; | |
1226 | yp = fYJet; | |
1227 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; | |
1228 | ||
1229 | } | |
1230 | ||
3dc3ec94 | 1231 | void AliPythia::ConfigHeavyFlavor() |
1232 | { | |
1233 | // | |
1234 | // Default configuration for Heavy Flavor production | |
1235 | // | |
1236 | // All QCD processes | |
1237 | // | |
1238 | SetMSEL(1); | |
1239 | ||
1240 | // No multiple interactions | |
1241 | SetMSTP(81,0); | |
39c2e610 | 1242 | SetPARP(81, 0.); |
1243 | SetPARP(82, 0.); | |
3dc3ec94 | 1244 | // Initial/final parton shower on (Pythia default) |
1245 | SetMSTP(61,1); | |
1246 | SetMSTP(71,1); | |
1247 | ||
1248 | // 2nd order alpha_s | |
1249 | SetMSTP(2,2); | |
1250 | ||
1251 | // QCD scales | |
1252 | SetMSTP(32,2); | |
1253 | SetPARP(34,1.0); | |
1254 | } | |
e0e89f40 | 1255 | |
1256 | void AliPythia::AtlasTuning() | |
1257 | { | |
1258 | // | |
1259 | // Configuration for the ATLAS tuning | |
1260 | SetMSTP(51, kCTEQ5L); // CTEQ5L pdf | |
1261 | SetMSTP(81,1); // Multiple Interactions ON | |
1262 | SetMSTP(82,4); // Double Gaussian Model | |
39c2e610 | 1263 | SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14) |
e0e89f40 | 1264 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy |
1265 | SetPARP(89,1000.); // [GeV] Ref. energy | |
1266 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
1267 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
1268 | SetPARP(84,0.5); // Core radius | |
1269 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
1270 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
1271 | SetPARP(67,1); // Regulates Initial State Radiation | |
1272 | } | |
e8a8adcd | 1273 | |
1274 | AliPythia& AliPythia::operator=(const AliPythia& rhs) | |
1275 | { | |
1276 | // Assignment operator | |
1277 | rhs.Copy(*this); | |
1278 | return *this; | |
1279 | } | |
1280 | ||
1281 | void AliPythia::Copy(TObject&) const | |
1282 | { | |
1283 | // | |
1284 | // Copy | |
1285 | // | |
1286 | Fatal("Copy","Not implemented!\n"); | |
1287 | } |