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