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1 | ||
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 | ||
17 | /* $Id$ */ | |
18 | ||
19 | #include "AliPythia.h" | |
20 | #include "AliPythiaRndm.h" | |
21 | #include "AliFastGlauber.h" | |
22 | #include "AliQuenchingWeights.h" | |
23 | #include "TVector3.h" | |
24 | #include "PyquenCommon.h" | |
25 | ||
26 | ClassImp(AliPythia) | |
27 | ||
28 | #ifndef WIN32 | |
29 | # define pyclus pyclus_ | |
30 | # define pycell pycell_ | |
31 | # define pyshow pyshow_ | |
32 | # define pyrobo pyrobo_ | |
33 | # define pyquen pyquen_ | |
34 | # define pyevnw pyevnw_ | |
35 | # define pyshowq pyshowq_ | |
36 | # define pytune pytune_ | |
37 | # define py2ent py2ent_ | |
38 | # define type_of_call | |
39 | #else | |
40 | # define pyclus PYCLUS | |
41 | # define pycell PYCELL | |
42 | # define pyrobo PYROBO | |
43 | # define pyquen PYQUEN | |
44 | # define pyevnw PYEVNW | |
45 | # define pyshowq PYSHOWQ | |
46 | # define pytune PYTUNE | |
47 | # define py2ent PY2ENT | |
48 | # define type_of_call _stdcall | |
49 | #endif | |
50 | ||
51 | extern "C" void type_of_call pyclus(Int_t & ); | |
52 | extern "C" void type_of_call pycell(Int_t & ); | |
53 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); | |
54 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); | |
55 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); | |
56 | extern "C" void type_of_call pyevnw(){;} | |
57 | extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &); | |
58 | extern "C" void type_of_call pytune(Int_t &); | |
59 | extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&); | |
60 | ||
61 | //_____________________________________________________________________________ | |
62 | ||
63 | AliPythia* AliPythia::fgAliPythia=NULL; | |
64 | ||
65 | AliPythia::AliPythia(): | |
66 | fProcess(kPyMb), | |
67 | fEcms(0.), | |
68 | fStrucFunc(kCTEQ5L), | |
69 | fXJet(0.), | |
70 | fYJet(0.), | |
71 | fNGmax(30), | |
72 | fZmax(0.97), | |
73 | fGlauber(0), | |
74 | fQuenchingWeights(0) | |
75 | { | |
76 | // Default Constructor | |
77 | // | |
78 | // Set random number | |
79 | if (!AliPythiaRndm::GetPythiaRandom()) | |
80 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
81 | fGlauber = 0; | |
82 | fQuenchingWeights = 0; | |
83 | } | |
84 | ||
85 | AliPythia::AliPythia(const AliPythia& pythia): | |
86 | TPythia6(pythia), | |
87 | AliRndm(pythia), | |
88 | fProcess(kPyMb), | |
89 | fEcms(0.), | |
90 | fStrucFunc(kCTEQ5L), | |
91 | fXJet(0.), | |
92 | fYJet(0.), | |
93 | fNGmax(30), | |
94 | fZmax(0.97), | |
95 | fGlauber(0), | |
96 | fQuenchingWeights(0) | |
97 | { | |
98 | // Copy Constructor | |
99 | pythia.Copy(*this); | |
100 | } | |
101 | ||
102 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune) | |
103 | { | |
104 | // Initialise the process to generate | |
105 | if (!AliPythiaRndm::GetPythiaRandom()) | |
106 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
107 | ||
108 | fProcess = process; | |
109 | fEcms = energy; | |
110 | fStrucFunc = strucfunc; | |
111 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. | |
112 | SetMDCY(Pycomp(111) ,1,0); // pi0 | |
113 | SetMDCY(Pycomp(310) ,1,0); // K0S | |
114 | SetMDCY(Pycomp(3122),1,0); // kLambda | |
115 | SetMDCY(Pycomp(3112),1,0); // sigma - | |
116 | SetMDCY(Pycomp(3212),1,0); // sigma 0 | |
117 | SetMDCY(Pycomp(3222),1,0); // sigma + | |
118 | SetMDCY(Pycomp(3312),1,0); // xi - | |
119 | SetMDCY(Pycomp(3322),1,0); // xi 0 | |
120 | SetMDCY(Pycomp(3334),1,0); // omega- | |
121 | // Select structure function | |
122 | SetMSTP(52,2); | |
123 | SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc)); | |
124 | // Particles produced in string fragmentation point directly to either of the two endpoints | |
125 | // of the string (depending in the side they were generated from). | |
126 | SetMSTU(16,2); | |
127 | ||
128 | // | |
129 | // Pythia initialisation for selected processes// | |
130 | // | |
131 | // Make MSEL clean | |
132 | // | |
133 | for (Int_t i=1; i<= 200; i++) { | |
134 | SetMSUB(i,0); | |
135 | } | |
136 | // select charm production | |
137 | switch (process) | |
138 | { | |
139 | case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes | |
140 | // Multiple interactions on. | |
141 | SetMSTP(81,1); | |
142 | // Double Gaussian matter distribution. | |
143 | SetMSTP(82,4); | |
144 | SetPARP(83,0.5); | |
145 | SetPARP(84,0.4); | |
146 | // pT0. | |
147 | SetPARP(82,2.0); | |
148 | // Reference energy for pT0 and energy rescaling pace. | |
149 | SetPARP(89,1800); | |
150 | SetPARP(90,0.25); | |
151 | // String drawing almost completely minimizes string length. | |
152 | SetPARP(85,0.9); | |
153 | SetPARP(86,0.95); | |
154 | // ISR and FSR activity. | |
155 | SetPARP(67,4); | |
156 | SetPARP(71,4); | |
157 | // Lambda_FSR scale. | |
158 | SetPARJ(81,0.29); | |
159 | break; | |
160 | case kPyOldUEQ2ordered2: | |
161 | // Old underlying events with Q2 ordered QCD processes | |
162 | // Multiple interactions on. | |
163 | SetMSTP(81,1); | |
164 | // Double Gaussian matter distribution. | |
165 | SetMSTP(82,4); | |
166 | SetPARP(83,0.5); | |
167 | SetPARP(84,0.4); | |
168 | // pT0. | |
169 | SetPARP(82,2.0); | |
170 | // Reference energy for pT0 and energy rescaling pace. | |
171 | SetPARP(89,1800); | |
172 | SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered | |
173 | // String drawing almost completely minimizes string length. | |
174 | SetPARP(85,0.9); | |
175 | SetPARP(86,0.95); | |
176 | // ISR and FSR activity. | |
177 | SetPARP(67,4); | |
178 | SetPARP(71,4); | |
179 | // Lambda_FSR scale. | |
180 | SetPARJ(81,0.29); | |
181 | break; | |
182 | case kPyOldPopcorn: | |
183 | // Old production mechanism: Old Popcorn | |
184 | SetMSEL(1); | |
185 | SetMSTJ(12,3); | |
186 | // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon | |
187 | SetMSTP(88,2); | |
188 | // (D=1)see can be used to form baryons (BARYON JUNCTION) | |
189 | SetMSTJ(1,1); | |
190 | AtlasTuning(); | |
191 | break; | |
192 | case kPyCharm: | |
193 | SetMSEL(4); | |
194 | // heavy quark masses | |
195 | ||
196 | SetPMAS(4,1,1.2); | |
197 | // | |
198 | // primordial pT | |
199 | SetMSTP(91,1); | |
200 | SetPARP(91,1.); | |
201 | SetPARP(93,5.); | |
202 | // | |
203 | break; | |
204 | case kPyBeauty: | |
205 | SetMSEL(5); | |
206 | SetPMAS(5,1,4.75); | |
207 | break; | |
208 | case kPyJpsi: | |
209 | SetMSEL(0); | |
210 | // gg->J/Psi g | |
211 | SetMSUB(86,1); | |
212 | break; | |
213 | case kPyJpsiChi: | |
214 | SetMSEL(0); | |
215 | // gg->J/Psi g | |
216 | SetMSUB(86,1); | |
217 | // gg-> chi_0c g | |
218 | SetMSUB(87,1); | |
219 | // gg-> chi_1c g | |
220 | SetMSUB(88,1); | |
221 | // gg-> chi_2c g | |
222 | SetMSUB(89,1); | |
223 | break; | |
224 | case kPyCharmUnforced: | |
225 | SetMSEL(0); | |
226 | // gq->qg | |
227 | SetMSUB(28,1); | |
228 | // gg->qq | |
229 | SetMSUB(53,1); | |
230 | // gg->gg | |
231 | SetMSUB(68,1); | |
232 | break; | |
233 | case kPyBeautyUnforced: | |
234 | SetMSEL(0); | |
235 | // gq->qg | |
236 | SetMSUB(28,1); | |
237 | // gg->qq | |
238 | SetMSUB(53,1); | |
239 | // gg->gg | |
240 | SetMSUB(68,1); | |
241 | break; | |
242 | case kPyMb: | |
243 | // Minimum Bias pp-Collisions | |
244 | // | |
245 | // | |
246 | // select Pythia min. bias model | |
247 | SetMSEL(0); | |
248 | SetMSUB(92,1); // single diffraction AB-->XB | |
249 | SetMSUB(93,1); // single diffraction AB-->AX | |
250 | SetMSUB(94,1); // double diffraction | |
251 | SetMSUB(95,1); // low pt production | |
252 | ||
253 | AtlasTuning(); | |
254 | break; | |
255 | ||
256 | case kPyMbWithDirectPhoton: | |
257 | // Minimum Bias pp-Collisions with direct photon processes added | |
258 | // | |
259 | // | |
260 | // select Pythia min. bias model | |
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 | SetMSUB(14,1); // | |
268 | SetMSUB(18,1); // | |
269 | SetMSUB(29,1); // | |
270 | SetMSUB(114,1); // | |
271 | SetMSUB(115,1); // | |
272 | ||
273 | ||
274 | AtlasTuning(); | |
275 | break; | |
276 | ||
277 | case kPyMbDefault: | |
278 | // Minimum Bias pp-Collisions | |
279 | // | |
280 | // | |
281 | // select Pythia min. bias model | |
282 | SetMSEL(0); | |
283 | SetMSUB(92,1); // single diffraction AB-->XB | |
284 | SetMSUB(93,1); // single diffraction AB-->AX | |
285 | SetMSUB(94,1); // double diffraction | |
286 | SetMSUB(95,1); // low pt production | |
287 | ||
288 | break; | |
289 | case kPyLhwgMb: | |
290 | // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120 | |
291 | // -> Pythia 6.3 or above is needed | |
292 | // | |
293 | SetMSEL(0); | |
294 | SetMSUB(92,1); // single diffraction AB-->XB | |
295 | SetMSUB(93,1); // single diffraction AB-->AX | |
296 | SetMSUB(94,1); // double diffraction | |
297 | SetMSUB(95,1); // low pt production | |
298 | ||
299 | SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf | |
300 | SetMSTP(52,2); | |
301 | SetMSTP(68,1); | |
302 | SetMSTP(70,2); | |
303 | SetMSTP(81,1); // Multiple Interactions ON | |
304 | SetMSTP(82,4); // Double Gaussian Model | |
305 | SetMSTP(88,1); | |
306 | ||
307 | SetPARP(82,2.3); // [GeV] PT_min at Ref. energy | |
308 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
309 | SetPARP(84,0.5); // Core radius | |
310 | SetPARP(85,0.9); // Regulates gluon prod. mechanism | |
311 | SetPARP(90,0.2); // 2*epsilon (exponent in power law) | |
312 | ||
313 | break; | |
314 | case kPyMbNonDiffr: | |
315 | // Minimum Bias pp-Collisions | |
316 | // | |
317 | // | |
318 | // select Pythia min. bias model | |
319 | SetMSEL(0); | |
320 | SetMSUB(95,1); // low pt production | |
321 | ||
322 | AtlasTuning(); | |
323 | break; | |
324 | case kPyMbMSEL1: | |
325 | ConfigHeavyFlavor(); | |
326 | // Intrinsic <kT^2> | |
327 | SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons | |
328 | SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2 | |
329 | SetPARP(93,5.); // Upper cut-off | |
330 | // Set Q-quark mass | |
331 | SetPMAS(4,1,1.2); // Charm quark mass | |
332 | SetPMAS(5,1,4.78); // Beauty quark mass | |
333 | SetPARP(71,4.); // Defaut value | |
334 | // Atlas Tuning | |
335 | AtlasTuning(); | |
336 | break; | |
337 | case kPyJets: | |
338 | // | |
339 | // QCD Jets | |
340 | // | |
341 | SetMSEL(1); | |
342 | // Pythia Tune A (CDF) | |
343 | // | |
344 | SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis) | |
345 | SetMSTP(82,4); // Double Gaussian Model | |
346 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy | |
347 | SetPARP(84,0.4); // Core radius | |
348 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism | |
349 | SetPARP(86,0.95); // Regulates gluon prod. mechanism | |
350 | SetPARP(89,1800.); // [GeV] Ref. energy | |
351 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) | |
352 | break; | |
353 | case kPyDirectGamma: | |
354 | SetMSEL(10); | |
355 | break; | |
356 | case kPyCharmPbPbMNR: | |
357 | case kPyD0PbPbMNR: | |
358 | case kPyDPlusPbPbMNR: | |
359 | case kPyDPlusStrangePbPbMNR: | |
360 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
361 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
362 | // c-cbar single inclusive and double differential distributions. | |
363 | // This parameter settings are meant to work with Pb-Pb collisions | |
364 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
365 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
366 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
367 | ConfigHeavyFlavor(); | |
368 | // Intrinsic <kT> | |
369 | SetMSTP(91,1); | |
370 | SetPARP(91,1.304); | |
371 | SetPARP(93,6.52); | |
372 | // Set c-quark mass | |
373 | SetPMAS(4,1,1.2); | |
374 | break; | |
375 | case kPyCharmpPbMNR: | |
376 | case kPyD0pPbMNR: | |
377 | case kPyDPluspPbMNR: | |
378 | case kPyDPlusStrangepPbMNR: | |
379 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
380 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
381 | // c-cbar single inclusive and double differential distributions. | |
382 | // This parameter settings are meant to work with p-Pb collisions | |
383 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
384 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
385 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
386 | ConfigHeavyFlavor(); | |
387 | // Intrinsic <kT> | |
388 | SetMSTP(91,1); | |
389 | SetPARP(91,1.16); | |
390 | SetPARP(93,5.8); | |
391 | ||
392 | // Set c-quark mass | |
393 | SetPMAS(4,1,1.2); | |
394 | break; | |
395 | case kPyCharmppMNR: | |
396 | case kPyD0ppMNR: | |
397 | case kPyDPlusppMNR: | |
398 | case kPyDPlusStrangeppMNR: | |
399 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
400 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
401 | // c-cbar single inclusive and double differential distributions. | |
402 | // This parameter settings are meant to work with pp collisions | |
403 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
404 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
405 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
406 | ConfigHeavyFlavor(); | |
407 | // Intrinsic <kT^2> | |
408 | SetMSTP(91,1); | |
409 | SetPARP(91,1.); | |
410 | SetPARP(93,5.); | |
411 | ||
412 | // Set c-quark mass | |
413 | SetPMAS(4,1,1.2); | |
414 | break; | |
415 | case kPyCharmppMNRwmi: | |
416 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
417 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
418 | // c-cbar single inclusive and double differential distributions. | |
419 | // This parameter settings are meant to work with pp collisions | |
420 | // and with kCTEQ5L PDFs. | |
421 | // Added multiple interactions according to ATLAS tune settings. | |
422 | // To get a "reasonable" agreement with MNR results, events have to be | |
423 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
424 | // set to 2.76 GeV. | |
425 | // To get a "perfect" agreement with MNR results, events have to be | |
426 | // generated in four ptHard bins with the following relative | |
427 | // normalizations: | |
428 | // 2.76-3 GeV: 25% | |
429 | // 3-4 GeV: 40% | |
430 | // 4-8 GeV: 29% | |
431 | // >8 GeV: 6% | |
432 | ConfigHeavyFlavor(); | |
433 | // Intrinsic <kT^2> | |
434 | SetMSTP(91,1); | |
435 | SetPARP(91,1.); | |
436 | SetPARP(93,5.); | |
437 | ||
438 | // Set c-quark mass | |
439 | SetPMAS(4,1,1.2); | |
440 | AtlasTuning(); | |
441 | break; | |
442 | case kPyBeautyPbPbMNR: | |
443 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
444 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
445 | // b-bbar single inclusive and double differential distributions. | |
446 | // This parameter settings are meant to work with Pb-Pb collisions | |
447 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
448 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
449 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
450 | ConfigHeavyFlavor(); | |
451 | // QCD scales | |
452 | SetPARP(67,1.0); | |
453 | SetPARP(71,1.0); | |
454 | // Intrinsic <kT> | |
455 | SetMSTP(91,1); | |
456 | SetPARP(91,2.035); | |
457 | SetPARP(93,10.17); | |
458 | // Set b-quark mass | |
459 | SetPMAS(5,1,4.75); | |
460 | break; | |
461 | case kPyBeautypPbMNR: | |
462 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
463 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
464 | // b-bbar single inclusive and double differential distributions. | |
465 | // This parameter settings are meant to work with p-Pb collisions | |
466 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
467 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
468 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
469 | ConfigHeavyFlavor(); | |
470 | // QCD scales | |
471 | SetPARP(67,1.0); | |
472 | SetPARP(71,1.0); | |
473 | // Intrinsic <kT> | |
474 | SetMSTP(91,1); | |
475 | SetPARP(91,1.60); | |
476 | SetPARP(93,8.00); | |
477 | // Set b-quark mass | |
478 | SetPMAS(5,1,4.75); | |
479 | break; | |
480 | case kPyBeautyppMNR: | |
481 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
482 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
483 | // b-bbar single inclusive and double differential distributions. | |
484 | // This parameter settings are meant to work with pp collisions | |
485 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
486 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
487 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
488 | ConfigHeavyFlavor(); | |
489 | // QCD scales | |
490 | SetPARP(67,1.0); | |
491 | SetPARP(71,1.0); | |
492 | ||
493 | // Intrinsic <kT> | |
494 | SetMSTP(91,1); | |
495 | SetPARP(91,1.); | |
496 | SetPARP(93,5.); | |
497 | ||
498 | // Set b-quark mass | |
499 | SetPMAS(5,1,4.75); | |
500 | break; | |
501 | case kPyBeautyJets: | |
502 | case kPyBeautyppMNRwmi: | |
503 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
504 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
505 | // b-bbar single inclusive and double differential distributions. | |
506 | // This parameter settings are meant to work with pp collisions | |
507 | // and with kCTEQ5L PDFs. | |
508 | // Added multiple interactions according to ATLAS tune settings. | |
509 | // To get a "reasonable" agreement with MNR results, events have to be | |
510 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
511 | // set to 2.76 GeV. | |
512 | // To get a "perfect" agreement with MNR results, events have to be | |
513 | // generated in four ptHard bins with the following relative | |
514 | // normalizations: | |
515 | // 2.76-4 GeV: 5% | |
516 | // 4-6 GeV: 31% | |
517 | // 6-8 GeV: 28% | |
518 | // >8 GeV: 36% | |
519 | ConfigHeavyFlavor(); | |
520 | // QCD scales | |
521 | SetPARP(67,1.0); | |
522 | SetPARP(71,1.0); | |
523 | ||
524 | // Intrinsic <kT> | |
525 | SetMSTP(91,1); | |
526 | SetPARP(91,1.); | |
527 | SetPARP(93,5.); | |
528 | ||
529 | // Set b-quark mass | |
530 | SetPMAS(5,1,4.75); | |
531 | ||
532 | AtlasTuning(); | |
533 | break; | |
534 | case kPyW: | |
535 | ||
536 | //Inclusive production of W+/- | |
537 | SetMSEL(0); | |
538 | //f fbar -> W+ | |
539 | SetMSUB(2,1); | |
540 | // //f fbar -> g W+ | |
541 | // SetMSUB(16,1); | |
542 | // //f fbar -> gamma W+ | |
543 | // SetMSUB(20,1); | |
544 | // //f g -> f W+ | |
545 | // SetMSUB(31,1); | |
546 | // //f gamma -> f W+ | |
547 | // SetMSUB(36,1); | |
548 | ||
549 | // Initial/final parton shower on (Pythia default) | |
550 | // With parton showers on we are generating "W inclusive process" | |
551 | SetMSTP(61,1); //Initial QCD & QED showers on | |
552 | SetMSTP(71,1); //Final QCD & QED showers on | |
553 | ||
554 | break; | |
555 | ||
556 | case kPyZ: | |
557 | ||
558 | //Inclusive production of Z | |
559 | SetMSEL(0); | |
560 | //f fbar -> Z/gamma | |
561 | SetMSUB(1,1); | |
562 | ||
563 | // // f fbar -> g Z/gamma | |
564 | // SetMSUB(15,1); | |
565 | // // f fbar -> gamma Z/gamma | |
566 | // SetMSUB(19,1); | |
567 | // // f g -> f Z/gamma | |
568 | // SetMSUB(30,1); | |
569 | // // f gamma -> f Z/gamma | |
570 | // SetMSUB(35,1); | |
571 | ||
572 | //only Z included, not gamma | |
573 | SetMSTP(43,2); | |
574 | ||
575 | // Initial/final parton shower on (Pythia default) | |
576 | // With parton showers on we are generating "Z inclusive process" | |
577 | SetMSTP(61,1); //Initial QCD & QED showers on | |
578 | SetMSTP(71,1); //Final QCD & QED showers on | |
579 | ||
580 | break; | |
581 | ||
582 | } | |
583 | // | |
584 | // Initialize PYTHIA | |
585 | // | |
586 | // Select the tune | |
587 | if (itune > -1) Pytune(itune); | |
588 | ||
589 | // | |
590 | SetMSTP(41,1); // all resonance decays switched on | |
591 | Initialize("CMS","p","p",fEcms); | |
592 | ||
593 | } | |
594 | ||
595 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
596 | { | |
597 | // Check Lund particle code (for debugging) | |
598 | Int_t kc=Pycomp(kf); | |
599 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
600 | return kc; | |
601 | } | |
602 | ||
603 | void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf) | |
604 | { | |
605 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
606 | // The MSTP array in the PYPARS common block is used to enable and | |
607 | // select the nuclear structure functions. | |
608 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
609 | // =1: internal PYTHIA acording to MSTP(51) | |
610 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
611 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
612 | // MSTP(192) : Mass number of nucleus side 1 | |
613 | // MSTP(193) : Mass number of nucleus side 2 | |
614 | // MSTP(194) : Nuclear structure function: 0: EKS98 1:EPS08 | |
615 | SetMSTP(52,2); | |
616 | SetMSTP(192, a1); | |
617 | SetMSTP(193, a2); | |
618 | SetMSTP(194, pdf); | |
619 | } | |
620 | ||
621 | ||
622 | AliPythia* AliPythia::Instance() | |
623 | { | |
624 | // Set random number generator | |
625 | if (fgAliPythia) { | |
626 | return fgAliPythia; | |
627 | } else { | |
628 | fgAliPythia = new AliPythia(); | |
629 | return fgAliPythia; | |
630 | } | |
631 | } | |
632 | ||
633 | void AliPythia::PrintParticles() | |
634 | { | |
635 | // Print list of particl properties | |
636 | Int_t np = 0; | |
637 | char* name = new char[16]; | |
638 | for (Int_t kf=0; kf<1000000; kf++) { | |
639 | for (Int_t c = 1; c > -2; c-=2) { | |
640 | Int_t kc = Pycomp(c*kf); | |
641 | if (kc) { | |
642 | Float_t mass = GetPMAS(kc,1); | |
643 | Float_t width = GetPMAS(kc,2); | |
644 | Float_t tau = GetPMAS(kc,4); | |
645 | ||
646 | Pyname(kf,name); | |
647 | ||
648 | np++; | |
649 | ||
650 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
651 | c*kf, name, mass, width, tau); | |
652 | } | |
653 | } | |
654 | } | |
655 | printf("\n Number of particles %d \n \n", np); | |
656 | } | |
657 | ||
658 | void AliPythia::ResetDecayTable() | |
659 | { | |
660 | // Set default values for pythia decay switches | |
661 | Int_t i; | |
662 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
663 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
664 | } | |
665 | ||
666 | void AliPythia::SetDecayTable() | |
667 | { | |
668 | // Set default values for pythia decay switches | |
669 | // | |
670 | Int_t i; | |
671 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
672 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
673 | } | |
674 | ||
675 | void AliPythia::Pyclus(Int_t& njet) | |
676 | { | |
677 | // Call Pythia clustering algorithm | |
678 | // | |
679 | pyclus(njet); | |
680 | } | |
681 | ||
682 | void AliPythia::Pycell(Int_t& njet) | |
683 | { | |
684 | // Call Pythia jet reconstruction algorithm | |
685 | // | |
686 | pycell(njet); | |
687 | } | |
688 | ||
689 | void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) | |
690 | { | |
691 | // Call Pythia jet reconstruction algorithm | |
692 | // | |
693 | pyshow(ip1, ip2, qmax); | |
694 | } | |
695 | ||
696 | void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) | |
697 | { | |
698 | pyrobo(imi, ima, the, phi, bex, bey, bez); | |
699 | } | |
700 | ||
701 | void AliPythia::Pytune(Int_t itune) | |
702 | { | |
703 | /* | |
704 | C | |
705 | C ITUNE NAME (detailed descriptions below) | |
706 | C 0 Default : No settings changed => linked Pythia version's defaults. | |
707 | C ====== Old UE, Q2-ordered showers ========================================== | |
708 | C 100 A : Rick Field's CDF Tune A | |
709 | C 101 AW : Rick Field's CDF Tune AW | |
710 | C 102 BW : Rick Field's CDF Tune BW | |
711 | C 103 DW : Rick Field's CDF Tune DW | |
712 | C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling | |
713 | C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally) | |
714 | C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome) | |
715 | C 107 ACR : Tune A modified with annealing CR | |
716 | C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally) | |
717 | C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally) | |
718 | C ====== Intermediate Models ================================================= | |
719 | C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR | |
720 | C 201 APT : Tune A modified to use pT-ordered final-state showers | |
721 | C ====== New UE, interleaved pT-ordered showers, annealing CR ================ | |
722 | C 300 S0 : Sandhoff-Skands Tune 0 | |
723 | C 301 S1 : Sandhoff-Skands Tune 1 | |
724 | C 302 S2 : Sandhoff-Skands Tune 2 | |
725 | C 303 S0A : S0 with "Tune A" UE energy scaling | |
726 | C 304 NOCR : New UE "best try" without colour reconnections | |
727 | C 305 Old : New UE, original (primitive) colour reconnections | |
728 | C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally) | |
729 | C ======= The Uppsala models ================================================= | |
730 | C ( NB! must be run with special modified Pythia 6.215 version ) | |
731 | C ( available from http://www.isv.uu.se/thep/MC/scigal/ ) | |
732 | C 400 GAL 0 : Generalized area-law model. Old parameters | |
733 | C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters | |
734 | C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands) | |
735 | */ | |
736 | pytune(itune); | |
737 | } | |
738 | ||
739 | void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){ | |
740 | // Inset 2-parton system at line idx | |
741 | py2ent(idx, pdg1, pdg2, p); | |
742 | } | |
743 | ||
744 | ||
745 | void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax) | |
746 | { | |
747 | // Initializes | |
748 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann | |
749 | // (2) The nuclear geometry using the Glauber Model | |
750 | // | |
751 | ||
752 | fGlauber = AliFastGlauber::Instance(); | |
753 | fGlauber->Init(2); | |
754 | fGlauber->SetCentralityClass(cMin, cMax); | |
755 | ||
756 | fQuenchingWeights = new AliQuenchingWeights(); | |
757 | fQuenchingWeights->InitMult(); | |
758 | fQuenchingWeights->SetK(k); | |
759 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); | |
760 | fNGmax = ngmax; | |
761 | fZmax = zmax; | |
762 | ||
763 | } | |
764 | ||
765 | ||
766 | void AliPythia::Quench() | |
767 | { | |
768 | // | |
769 | // | |
770 | // Simple Jet Quenching routine: | |
771 | // ============================= | |
772 | // The jet formed by all final state partons radiated by the parton created | |
773 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in | |
774 | // the initial parton reference frame: | |
775 | // (E + p_z)new = (1-z) (E + p_z)old | |
776 | // | |
777 | // | |
778 | // | |
779 | // | |
780 | // The lost momentum is first balanced by one gluon with virtuality > 0. | |
781 | // Subsequently the gluon splits to yield two gluons with E = p. | |
782 | // | |
783 | // | |
784 | // | |
785 | static Float_t eMean = 0.; | |
786 | static Int_t icall = 0; | |
787 | ||
788 | Double_t p0[4][5]; | |
789 | Double_t p1[4][5]; | |
790 | Double_t p2[4][5]; | |
791 | Int_t klast[4] = {-1, -1, -1, -1}; | |
792 | ||
793 | Int_t numpart = fPyjets->N; | |
794 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; | |
795 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; | |
796 | Bool_t quenched[4]; | |
797 | Double_t wjtKick[4]; | |
798 | Int_t nGluon[4]; | |
799 | Int_t qPdg[4]; | |
800 | Int_t imo, kst, pdg; | |
801 | ||
802 | // | |
803 | // Sore information about Primary partons | |
804 | // | |
805 | // j = | |
806 | // 0, 1 partons from hard scattering | |
807 | // 2, 3 partons from initial state radiation | |
808 | // | |
809 | for (Int_t i = 2; i <= 7; i++) { | |
810 | Int_t j = 0; | |
811 | // Skip gluons that participate in hard scattering | |
812 | if (i == 4 || i == 5) continue; | |
813 | // Gluons from hard Scattering | |
814 | if (i == 6 || i == 7) { | |
815 | j = i - 6; | |
816 | pxq[j] = fPyjets->P[0][i]; | |
817 | pyq[j] = fPyjets->P[1][i]; | |
818 | pzq[j] = fPyjets->P[2][i]; | |
819 | eq[j] = fPyjets->P[3][i]; | |
820 | mq[j] = fPyjets->P[4][i]; | |
821 | } else { | |
822 | // Gluons from initial state radiation | |
823 | // | |
824 | // Obtain 4-momentum vector from difference between original parton and parton after gluon | |
825 | // radiation. Energy is calculated independently because initial state radition does not | |
826 | // conserve strictly momentum and energy for each partonic system independently. | |
827 | // | |
828 | // Not very clean. Should be improved ! | |
829 | // | |
830 | // | |
831 | j = i; | |
832 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; | |
833 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; | |
834 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; | |
835 | mq[j] = fPyjets->P[4][i]; | |
836 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); | |
837 | } | |
838 | // | |
839 | // Calculate some kinematic variables | |
840 | // | |
841 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); | |
842 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); | |
843 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); | |
844 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); | |
845 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); | |
846 | qPdg[j] = fPyjets->K[1][i]; | |
847 | } | |
848 | ||
849 | Double_t int0[4]; | |
850 | Double_t int1[4]; | |
851 | ||
852 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); | |
853 | ||
854 | for (Int_t j = 0; j < 4; j++) { | |
855 | // | |
856 | // Quench only central jets and with E > 10. | |
857 | // | |
858 | ||
859 | ||
860 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; | |
861 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); | |
862 | ||
863 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { | |
864 | fZQuench[j] = 0.; | |
865 | } else { | |
866 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { | |
867 | icall ++; | |
868 | eMean += eloss; | |
869 | } | |
870 | // | |
871 | // Extra pt | |
872 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); | |
873 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); | |
874 | // | |
875 | // Fractional energy loss | |
876 | fZQuench[j] = eloss / eq[j]; | |
877 | // | |
878 | // Avoid complete loss | |
879 | // | |
880 | if (fZQuench[j] > fZmax) fZQuench[j] = fZmax; | |
881 | // | |
882 | // Some debug printing | |
883 | ||
884 | ||
885 | // 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", | |
886 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); | |
887 | ||
888 | // fZQuench[j] = 0.8; | |
889 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); | |
890 | } | |
891 | ||
892 | quenched[j] = (fZQuench[j] > 0.01); | |
893 | } // primary partons | |
894 | ||
895 | ||
896 | ||
897 | Double_t pNew[1000][4]; | |
898 | Int_t kNew[1000]; | |
899 | Int_t icount = 0; | |
900 | Double_t zquench[4]; | |
901 | ||
902 | // | |
903 | // System Loop | |
904 | for (Int_t isys = 0; isys < 4; isys++) { | |
905 | // Skip to next system if not quenched. | |
906 | if (!quenched[isys]) continue; | |
907 | ||
908 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); | |
909 | if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax; | |
910 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); | |
911 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); | |
912 | ||
913 | ||
914 | ||
915 | Int_t igMin = -1; | |
916 | Int_t igMax = -1; | |
917 | Double_t pg[4] = {0., 0., 0., 0.}; | |
918 | ||
919 | // | |
920 | // Loop on radiation events | |
921 | ||
922 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { | |
923 | while (1) { | |
924 | icount = 0; | |
925 | for (Int_t k = 0; k < 4; k++) | |
926 | { | |
927 | p0[isys][k] = 0.; | |
928 | p1[isys][k] = 0.; | |
929 | p2[isys][k] = 0.; | |
930 | } | |
931 | // Loop over partons | |
932 | for (Int_t i = 0; i < numpart; i++) | |
933 | { | |
934 | imo = fPyjets->K[2][i]; | |
935 | kst = fPyjets->K[0][i]; | |
936 | pdg = fPyjets->K[1][i]; | |
937 | ||
938 | ||
939 | ||
940 | // Quarks and gluons only | |
941 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; | |
942 | // Particles from hard scattering only | |
943 | ||
944 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; | |
945 | Int_t imom = imo % 1000; | |
946 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; | |
947 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; | |
948 | ||
949 | ||
950 | // Skip comment lines | |
951 | if (kst != 1 && kst != 2) continue; | |
952 | // | |
953 | // Parton kinematic | |
954 | px = fPyjets->P[0][i]; | |
955 | py = fPyjets->P[1][i]; | |
956 | pz = fPyjets->P[2][i]; | |
957 | e = fPyjets->P[3][i]; | |
958 | m = fPyjets->P[4][i]; | |
959 | pt = TMath::Sqrt(px * px + py * py); | |
960 | p = TMath::Sqrt(px * px + py * py + pz * pz); | |
961 | phi = TMath::Pi() + TMath::ATan2(-py, -px); | |
962 | theta = TMath::ATan2(pt, pz); | |
963 | ||
964 | // | |
965 | // Save 4-momentum sum for balancing | |
966 | Int_t index = isys; | |
967 | ||
968 | p0[index][0] += px; | |
969 | p0[index][1] += py; | |
970 | p0[index][2] += pz; | |
971 | p0[index][3] += e; | |
972 | ||
973 | klast[index] = i; | |
974 | ||
975 | // | |
976 | // Fractional energy loss | |
977 | Double_t z = zquench[index]; | |
978 | ||
979 | ||
980 | // Don't fully quench radiated gluons | |
981 | // | |
982 | if (imo > 1000) { | |
983 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination | |
984 | // | |
985 | ||
986 | z = 0.02; | |
987 | } | |
988 | // printf("z: %d %f\n", imo, z); | |
989 | ||
990 | ||
991 | // | |
992 | ||
993 | // | |
994 | // | |
995 | // Transform into frame in which initial parton is along z-axis | |
996 | // | |
997 | TVector3 v(px, py, pz); | |
998 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); | |
999 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); | |
1000 | ||
1001 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); | |
1002 | Double_t mt2 = jt * jt + m * m; | |
1003 | Double_t zmax = 1.; | |
1004 | // | |
1005 | // Kinematic limit on z | |
1006 | // | |
1007 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); | |
1008 | // | |
1009 | // Change light-cone kinematics rel. to initial parton | |
1010 | // | |
1011 | Double_t eppzOld = e + pl; | |
1012 | Double_t empzOld = e - pl; | |
1013 | ||
1014 | Double_t eppzNew = (1. - z) * eppzOld; | |
1015 | Double_t empzNew = empzOld - mt2 * z / eppzOld; | |
1016 | Double_t eNew = 0.5 * (eppzNew + empzNew); | |
1017 | Double_t plNew = 0.5 * (eppzNew - empzNew); | |
1018 | ||
1019 | Double_t jtNew; | |
1020 | // | |
1021 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 | |
1022 | Double_t mt2New = eppzNew * empzNew; | |
1023 | if (mt2New < 1.e-8) mt2New = 0.; | |
1024 | if (z < zmax) { | |
1025 | if (m * m > mt2New) { | |
1026 | // | |
1027 | // This should not happen | |
1028 | // | |
1029 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); | |
1030 | jtNew = 0; | |
1031 | } else { | |
1032 | jtNew = TMath::Sqrt(mt2New - m * m); | |
1033 | } | |
1034 | } else { | |
1035 | // If pT is to small (probably a leading massive particle) we scale only the energy | |
1036 | // This can cause negative masses of the radiated gluon | |
1037 | // Let's hope for the best ... | |
1038 | jtNew = jt; | |
1039 | eNew = TMath::Sqrt(plNew * plNew + mt2); | |
1040 | ||
1041 | } | |
1042 | // | |
1043 | // Calculate new px, py | |
1044 | // | |
1045 | Double_t pxNew = 0; | |
1046 | Double_t pyNew = 0; | |
1047 | ||
1048 | if (jt>0) { | |
1049 | pxNew = jtNew / jt * pxs; | |
1050 | pyNew = jtNew / jt * pys; | |
1051 | } | |
1052 | // Double_t dpx = pxs - pxNew; | |
1053 | // Double_t dpy = pys - pyNew; | |
1054 | // Double_t dpz = pl - plNew; | |
1055 | // Double_t de = e - eNew; | |
1056 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; | |
1057 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); | |
1058 | // printf("New mass (2) %e %e \n", pxNew, pyNew); | |
1059 | // | |
1060 | // Rotate back | |
1061 | // | |
1062 | TVector3 w(pxNew, pyNew, plNew); | |
1063 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); | |
1064 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); | |
1065 | ||
1066 | p1[index][0] += pxNew; | |
1067 | p1[index][1] += pyNew; | |
1068 | p1[index][2] += plNew; | |
1069 | p1[index][3] += eNew; | |
1070 | // | |
1071 | // Updated 4-momentum vectors | |
1072 | // | |
1073 | pNew[icount][0] = pxNew; | |
1074 | pNew[icount][1] = pyNew; | |
1075 | pNew[icount][2] = plNew; | |
1076 | pNew[icount][3] = eNew; | |
1077 | kNew[icount] = i; | |
1078 | icount++; | |
1079 | } // parton loop | |
1080 | // | |
1081 | // Check if there was phase-space for quenching | |
1082 | // | |
1083 | ||
1084 | if (icount == 0) quenched[isys] = kFALSE; | |
1085 | if (!quenched[isys]) break; | |
1086 | ||
1087 | for (Int_t j = 0; j < 4; j++) | |
1088 | { | |
1089 | p2[isys][j] = p0[isys][j] - p1[isys][j]; | |
1090 | } | |
1091 | 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]; | |
1092 | if (p2[isys][4] > 0.) { | |
1093 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); | |
1094 | break; | |
1095 | } else { | |
1096 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); | |
1097 | 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]); | |
1098 | if (p2[isys][4] < -0.01) { | |
1099 | printf("Negative mass squared !\n"); | |
1100 | // Here we have to put the gluon back to mass shell | |
1101 | // This will lead to a small energy imbalance | |
1102 | p2[isys][4] = 0.; | |
1103 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); | |
1104 | break; | |
1105 | } else { | |
1106 | p2[isys][4] = 0.; | |
1107 | break; | |
1108 | } | |
1109 | } | |
1110 | /* | |
1111 | zHeavy *= 0.98; | |
1112 | printf("zHeavy lowered to %f\n", zHeavy); | |
1113 | if (zHeavy < 0.01) { | |
1114 | printf("No success ! \n"); | |
1115 | icount = 0; | |
1116 | quenched[isys] = kFALSE; | |
1117 | break; | |
1118 | } | |
1119 | */ | |
1120 | } // iteration on z (while) | |
1121 | ||
1122 | // Update event record | |
1123 | for (Int_t k = 0; k < icount; k++) { | |
1124 | // 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] ); | |
1125 | fPyjets->P[0][kNew[k]] = pNew[k][0]; | |
1126 | fPyjets->P[1][kNew[k]] = pNew[k][1]; | |
1127 | fPyjets->P[2][kNew[k]] = pNew[k][2]; | |
1128 | fPyjets->P[3][kNew[k]] = pNew[k][3]; | |
1129 | } | |
1130 | // | |
1131 | // Add the gluons | |
1132 | // | |
1133 | Int_t ish = 0; | |
1134 | Int_t iGlu; | |
1135 | if (!quenched[isys]) continue; | |
1136 | // | |
1137 | // Last parton from shower i | |
1138 | Int_t in = klast[isys]; | |
1139 | // | |
1140 | // Continue if no parton in shower i selected | |
1141 | if (in == -1) continue; | |
1142 | // | |
1143 | // If this is the second initial parton and it is behind the first move pointer by previous ish | |
1144 | if (isys == 1 && klast[1] > klast[0]) in += ish; | |
1145 | // | |
1146 | // Starting index | |
1147 | ||
1148 | // jmin = in - 1; | |
1149 | // How many additional gluons will be generated | |
1150 | ish = 1; | |
1151 | if (p2[isys][4] > 0.05) ish = 2; | |
1152 | // | |
1153 | // Position of gluons | |
1154 | iGlu = numpart; | |
1155 | if (iglu == 0) igMin = iGlu; | |
1156 | igMax = iGlu; | |
1157 | numpart += ish; | |
1158 | (fPyjets->N) += ish; | |
1159 | ||
1160 | if (ish == 1) { | |
1161 | fPyjets->P[0][iGlu] = p2[isys][0]; | |
1162 | fPyjets->P[1][iGlu] = p2[isys][1]; | |
1163 | fPyjets->P[2][iGlu] = p2[isys][2]; | |
1164 | fPyjets->P[3][iGlu] = p2[isys][3]; | |
1165 | fPyjets->P[4][iGlu] = p2[isys][4]; | |
1166 | ||
1167 | fPyjets->K[0][iGlu] = 1; | |
1168 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; | |
1169 | fPyjets->K[1][iGlu] = 21; | |
1170 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; | |
1171 | fPyjets->K[3][iGlu] = -1; | |
1172 | fPyjets->K[4][iGlu] = -1; | |
1173 | ||
1174 | pg[0] += p2[isys][0]; | |
1175 | pg[1] += p2[isys][1]; | |
1176 | pg[2] += p2[isys][2]; | |
1177 | pg[3] += p2[isys][3]; | |
1178 | } else { | |
1179 | // | |
1180 | // Split gluon in rest frame. | |
1181 | // | |
1182 | Double_t bx = p2[isys][0] / p2[isys][3]; | |
1183 | Double_t by = p2[isys][1] / p2[isys][3]; | |
1184 | Double_t bz = p2[isys][2] / p2[isys][3]; | |
1185 | Double_t pst = p2[isys][4] / 2.; | |
1186 | // | |
1187 | // Isotropic decay ???? | |
1188 | Double_t cost = 2. * gRandom->Rndm() - 1.; | |
1189 | Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost)); | |
1190 | Double_t phis = 2. * TMath::Pi() * gRandom->Rndm(); | |
1191 | ||
1192 | Double_t pz1 = pst * cost; | |
1193 | Double_t pz2 = -pst * cost; | |
1194 | Double_t pt1 = pst * sint; | |
1195 | Double_t pt2 = -pst * sint; | |
1196 | Double_t px1 = pt1 * TMath::Cos(phis); | |
1197 | Double_t py1 = pt1 * TMath::Sin(phis); | |
1198 | Double_t px2 = pt2 * TMath::Cos(phis); | |
1199 | Double_t py2 = pt2 * TMath::Sin(phis); | |
1200 | ||
1201 | fPyjets->P[0][iGlu] = px1; | |
1202 | fPyjets->P[1][iGlu] = py1; | |
1203 | fPyjets->P[2][iGlu] = pz1; | |
1204 | fPyjets->P[3][iGlu] = pst; | |
1205 | fPyjets->P[4][iGlu] = 0.; | |
1206 | ||
1207 | fPyjets->K[0][iGlu] = 1 ; | |
1208 | fPyjets->K[1][iGlu] = 21; | |
1209 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; | |
1210 | fPyjets->K[3][iGlu] = -1; | |
1211 | fPyjets->K[4][iGlu] = -1; | |
1212 | ||
1213 | fPyjets->P[0][iGlu+1] = px2; | |
1214 | fPyjets->P[1][iGlu+1] = py2; | |
1215 | fPyjets->P[2][iGlu+1] = pz2; | |
1216 | fPyjets->P[3][iGlu+1] = pst; | |
1217 | fPyjets->P[4][iGlu+1] = 0.; | |
1218 | ||
1219 | fPyjets->K[0][iGlu+1] = 1; | |
1220 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; | |
1221 | fPyjets->K[1][iGlu+1] = 21; | |
1222 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; | |
1223 | fPyjets->K[3][iGlu+1] = -1; | |
1224 | fPyjets->K[4][iGlu+1] = -1; | |
1225 | SetMSTU(1,0); | |
1226 | SetMSTU(2,0); | |
1227 | // | |
1228 | // Boost back | |
1229 | // | |
1230 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); | |
1231 | } | |
1232 | /* | |
1233 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { | |
1234 | Double_t px, py, pz; | |
1235 | px = fPyjets->P[0][ig]; | |
1236 | py = fPyjets->P[1][ig]; | |
1237 | pz = fPyjets->P[2][ig]; | |
1238 | TVector3 v(px, py, pz); | |
1239 | v.RotateZ(-phiq[isys]); | |
1240 | v.RotateY(-thetaq[isys]); | |
1241 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); | |
1242 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1243 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); | |
1244 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); | |
1245 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1246 | pxs += jtKick * TMath::Cos(phiKick); | |
1247 | pys += jtKick * TMath::Sin(phiKick); | |
1248 | TVector3 w(pxs, pys, pzs); | |
1249 | w.RotateY(thetaq[isys]); | |
1250 | w.RotateZ(phiq[isys]); | |
1251 | fPyjets->P[0][ig] = w.X(); | |
1252 | fPyjets->P[1][ig] = w.Y(); | |
1253 | fPyjets->P[2][ig] = w.Z(); | |
1254 | fPyjets->P[2][ig] = w.Mag(); | |
1255 | } | |
1256 | */ | |
1257 | } // kGluon | |
1258 | ||
1259 | ||
1260 | // Check energy conservation | |
1261 | Double_t pxs = 0.; | |
1262 | Double_t pys = 0.; | |
1263 | Double_t pzs = 0.; | |
1264 | Double_t es = 14000.; | |
1265 | ||
1266 | for (Int_t i = 0; i < numpart; i++) | |
1267 | { | |
1268 | kst = fPyjets->K[0][i]; | |
1269 | if (kst != 1 && kst != 2) continue; | |
1270 | pxs += fPyjets->P[0][i]; | |
1271 | pys += fPyjets->P[1][i]; | |
1272 | pzs += fPyjets->P[2][i]; | |
1273 | es -= fPyjets->P[3][i]; | |
1274 | } | |
1275 | if (TMath::Abs(pxs) > 1.e-2 || | |
1276 | TMath::Abs(pys) > 1.e-2 || | |
1277 | TMath::Abs(pzs) > 1.e-1) { | |
1278 | printf("%e %e %e %e\n", pxs, pys, pzs, es); | |
1279 | // Fatal("Quench()", "4-Momentum non-conservation"); | |
1280 | } | |
1281 | ||
1282 | } // end quenching loop (systems) | |
1283 | // Clean-up | |
1284 | for (Int_t i = 0; i < numpart; i++) | |
1285 | { | |
1286 | imo = fPyjets->K[2][i]; | |
1287 | if (imo > 1000) { | |
1288 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; | |
1289 | } | |
1290 | } | |
1291 | // this->Pylist(1); | |
1292 | } // end quench | |
1293 | ||
1294 | ||
1295 | void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b) | |
1296 | { | |
1297 | // Igor Lokthine's quenching routine | |
1298 | // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt | |
1299 | ||
1300 | pyquen(a, ibf, b); | |
1301 | } | |
1302 | ||
1303 | void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl) | |
1304 | { | |
1305 | // Set the parameters for the PYQUEN package. | |
1306 | // See comments in PyquenCommon.h | |
1307 | ||
1308 | ||
1309 | PYQPAR.t0 = t0; | |
1310 | PYQPAR.tau0 = tau0; | |
1311 | PYQPAR.nf = nf; | |
1312 | PYQPAR.iengl = iengl; | |
1313 | PYQPAR.iangl = iangl; | |
1314 | } | |
1315 | ||
1316 | ||
1317 | void AliPythia::Pyevnw() | |
1318 | { | |
1319 | // New multiple interaction scenario | |
1320 | pyevnw(); | |
1321 | } | |
1322 | ||
1323 | void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax) | |
1324 | { | |
1325 | // Call medium-modified Pythia jet reconstruction algorithm | |
1326 | // | |
1327 | pyshowq(ip1, ip2, qmax); | |
1328 | } | |
1329 | ||
1330 | void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) | |
1331 | { | |
1332 | // Return event specific quenching parameters | |
1333 | xp = fXJet; | |
1334 | yp = fYJet; | |
1335 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; | |
1336 | ||
1337 | } | |
1338 | ||
1339 | void AliPythia::ConfigHeavyFlavor() | |
1340 | { | |
1341 | // | |
1342 | // Default configuration for Heavy Flavor production | |
1343 | // | |
1344 | // All QCD processes | |
1345 | // | |
1346 | SetMSEL(1); | |
1347 | ||
1348 | // No multiple interactions | |
1349 | SetMSTP(81,0); | |
1350 | SetPARP(81, 0.); | |
1351 | SetPARP(82, 0.); | |
1352 | // Initial/final parton shower on (Pythia default) | |
1353 | SetMSTP(61,1); | |
1354 | SetMSTP(71,1); | |
1355 | ||
1356 | // 2nd order alpha_s | |
1357 | SetMSTP(2,2); | |
1358 | ||
1359 | // QCD scales | |
1360 | SetMSTP(32,2); | |
1361 | SetPARP(34,1.0); | |
1362 | } | |
1363 | ||
1364 | void AliPythia::AtlasTuning() | |
1365 | { | |
1366 | // | |
1367 | // Configuration for the ATLAS tuning | |
1368 | SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf | |
1369 | SetMSTP(81,1); // Multiple Interactions ON | |
1370 | SetMSTP(82,4); // Double Gaussian Model | |
1371 | SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14) | |
1372 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
1373 | SetPARP(89,1000.); // [GeV] Ref. energy | |
1374 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
1375 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
1376 | SetPARP(84,0.5); // Core radius | |
1377 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
1378 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
1379 | SetPARP(67,1); // Regulates Initial State Radiation | |
1380 | } | |
1381 | ||
1382 | AliPythia& AliPythia::operator=(const AliPythia& rhs) | |
1383 | { | |
1384 | // Assignment operator | |
1385 | rhs.Copy(*this); | |
1386 | return *this; | |
1387 | } | |
1388 | ||
1389 | void AliPythia::Copy(TObject&) const | |
1390 | { | |
1391 | // | |
1392 | // Copy | |
1393 | // | |
1394 | Fatal("Copy","Not implemented!\n"); | |
1395 | } | |
1396 |