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6b435cde | 1 | |
8d2cd130 | 2 | /************************************************************************** |
3 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | * * | |
5 | * Author: The ALICE Off-line Project. * | |
6 | * Contributors are mentioned in the code where appropriate. * | |
7 | * * | |
8 | * Permission to use, copy, modify and distribute this software and its * | |
9 | * documentation strictly for non-commercial purposes is hereby granted * | |
10 | * without fee, provided that the above copyright notice appears in all * | |
11 | * copies and that both the copyright notice and this permission notice * | |
12 | * appear in the supporting documentation. The authors make no claims * | |
13 | * about the suitability of this software for any purpose. It is * | |
14 | * provided "as is" without express or implied warranty. * | |
15 | **************************************************************************/ | |
16 | ||
7cdba479 | 17 | /* $Id$ */ |
8d2cd130 | 18 | |
19 | #include "AliPythia.h" | |
7cdba479 | 20 | #include "AliPythiaRndm.h" |
12cb0bc0 | 21 | #include "AliFastGlauber.h" |
22 | #include "AliQuenchingWeights.h" | |
0f482ae4 | 23 | #include "TVector3.h" |
12cb0bc0 | 24 | #include "PyquenCommon.h" |
8d2cd130 | 25 | |
26 | ClassImp(AliPythia) | |
27 | ||
28 | #ifndef WIN32 | |
29 | # define pyclus pyclus_ | |
30 | # define pycell pycell_ | |
452af8c7 | 31 | # define pyshow pyshow_ |
32 | # define pyrobo pyrobo_ | |
992f2843 | 33 | # define pyquen pyquen_ |
16a82508 | 34 | # define pyevnw pyevnw_ |
cd07c39b | 35 | # define pyshowq pyshowq_ |
8d2cd130 | 36 | # define type_of_call |
37 | #else | |
38 | # define pyclus PYCLUS | |
39 | # define pycell PYCELL | |
452af8c7 | 40 | # define pyrobo PYROBO |
992f2843 | 41 | # define pyquen PYQUEN |
16a82508 | 42 | # define pyevnw PYEVNW |
cd07c39b | 43 | # define pyshowq PYSHOWQ |
8d2cd130 | 44 | # define type_of_call _stdcall |
45 | #endif | |
46 | ||
47 | extern "C" void type_of_call pyclus(Int_t & ); | |
48 | extern "C" void type_of_call pycell(Int_t & ); | |
452af8c7 | 49 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); |
50 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); | |
992f2843 | 51 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); |
0a2cfc0a | 52 | extern "C" void type_of_call pyevnw(){;} |
cd07c39b | 53 | extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &); |
8d2cd130 | 54 | |
55 | //_____________________________________________________________________________ | |
56 | ||
57 | AliPythia* AliPythia::fgAliPythia=NULL; | |
58 | ||
e8a8adcd | 59 | AliPythia::AliPythia(): |
60 | fProcess(kPyMb), | |
61 | fEcms(0.), | |
62 | fStrucFunc(kCTEQ5L), | |
63 | fXJet(0.), | |
64 | fYJet(0.), | |
32c8e463 | 65 | fNGmax(30), |
66 | fZmax(0.97), | |
e8a8adcd | 67 | fGlauber(0), |
68 | fQuenchingWeights(0) | |
8d2cd130 | 69 | { |
70 | // Default Constructor | |
71 | // | |
72 | // Set random number | |
7cdba479 | 73 | if (!AliPythiaRndm::GetPythiaRandom()) |
74 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
0f482ae4 | 75 | fGlauber = 0; |
76 | fQuenchingWeights = 0; | |
8d2cd130 | 77 | } |
78 | ||
e8a8adcd | 79 | AliPythia::AliPythia(const AliPythia& pythia): |
6b435cde | 80 | TPythia6(pythia), |
81 | AliRndm(pythia), | |
e8a8adcd | 82 | fProcess(kPyMb), |
83 | fEcms(0.), | |
84 | fStrucFunc(kCTEQ5L), | |
85 | fXJet(0.), | |
86 | fYJet(0.), | |
32c8e463 | 87 | fNGmax(30), |
88 | fZmax(0.97), | |
e8a8adcd | 89 | fGlauber(0), |
90 | fQuenchingWeights(0) | |
91 | { | |
92 | // Copy Constructor | |
93 | pythia.Copy(*this); | |
94 | } | |
95 | ||
8d2cd130 | 96 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) |
97 | { | |
98 | // Initialise the process to generate | |
7cdba479 | 99 | if (!AliPythiaRndm::GetPythiaRandom()) |
100 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
8d2cd130 | 101 | |
102 | fProcess = process; | |
103 | fEcms = energy; | |
104 | fStrucFunc = strucfunc; | |
1d5b1b20 | 105 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. |
e2de0ce1 | 106 | SetMDCY(Pycomp(111) ,1,0); // pi0 |
107 | SetMDCY(Pycomp(310) ,1,0); // K0S | |
108 | SetMDCY(Pycomp(3122),1,0); // kLambda | |
109 | SetMDCY(Pycomp(3112),1,0); // sigma - | |
110 | SetMDCY(Pycomp(3212),1,0); // sigma 0 | |
111 | SetMDCY(Pycomp(3222),1,0); // sigma + | |
112 | SetMDCY(Pycomp(3312),1,0); // xi - | |
113 | SetMDCY(Pycomp(3322),1,0); // xi 0 | |
114 | SetMDCY(Pycomp(3334),1,0); // omega- | |
1c50ec12 | 115 | // Select structure function |
8d2cd130 | 116 | SetMSTP(52,2); |
e2de0ce1 | 117 | SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc)); |
1c50ec12 | 118 | // Particles produced in string fragmentation point directly to either of the two endpoints |
119 | // of the string (depending in the side they were generated from). | |
120 | SetMSTU(16,2); | |
121 | ||
8d2cd130 | 122 | // |
123 | // Pythia initialisation for selected processes// | |
124 | // | |
125 | // Make MSEL clean | |
126 | // | |
127 | for (Int_t i=1; i<= 200; i++) { | |
128 | SetMSUB(i,0); | |
129 | } | |
130 | // select charm production | |
131 | switch (process) | |
132 | { | |
65f2626c | 133 | case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes |
134 | // Multiple interactions on. | |
135 | SetMSTP(81,1); | |
136 | // Double Gaussian matter distribution. | |
137 | SetMSTP(82,4); | |
138 | SetPARP(83,0.5); | |
139 | SetPARP(84,0.4); | |
140 | // pT0. | |
141 | SetPARP(82,2.0); | |
142 | // Reference energy for pT0 and energy rescaling pace. | |
143 | SetPARP(89,1800); | |
144 | SetPARP(90,0.25); | |
145 | // String drawing almost completely minimizes string length. | |
146 | SetPARP(85,0.9); | |
147 | SetPARP(86,0.95); | |
148 | // ISR and FSR activity. | |
149 | SetPARP(67,4); | |
150 | SetPARP(71,4); | |
151 | // Lambda_FSR scale. | |
152 | SetPARJ(81,0.29); | |
153 | break; | |
154 | case kPyOldUEQ2ordered2: | |
155 | // Old underlying events with Q2 ordered QCD processes | |
156 | // Multiple interactions on. | |
157 | SetMSTP(81,1); | |
158 | // Double Gaussian matter distribution. | |
159 | SetMSTP(82,4); | |
160 | SetPARP(83,0.5); | |
161 | SetPARP(84,0.4); | |
162 | // pT0. | |
163 | SetPARP(82,2.0); | |
164 | // Reference energy for pT0 and energy rescaling pace. | |
165 | SetPARP(89,1800); | |
166 | SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered | |
167 | // String drawing almost completely minimizes string length. | |
168 | SetPARP(85,0.9); | |
169 | SetPARP(86,0.95); | |
170 | // ISR and FSR activity. | |
171 | SetPARP(67,4); | |
172 | SetPARP(71,4); | |
173 | // Lambda_FSR scale. | |
174 | SetPARJ(81,0.29); | |
175 | break; | |
176 | case kPyOldPopcorn: | |
177 | // Old production mechanism: Old Popcorn | |
178 | SetMSEL(1); | |
179 | SetMSTJ(12,3); | |
180 | // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon | |
181 | SetMSTP(88,2); | |
182 | // (D=1)see can be used to form baryons (BARYON JUNCTION) | |
183 | SetMSTJ(1,1); | |
e0e89f40 | 184 | AtlasTuning(); |
65f2626c | 185 | break; |
8d2cd130 | 186 | case kPyCharm: |
187 | SetMSEL(4); | |
8d2cd130 | 188 | // heavy quark masses |
189 | ||
190 | SetPMAS(4,1,1.2); | |
8d2cd130 | 191 | // |
192 | // primordial pT | |
193 | SetMSTP(91,1); | |
194 | SetPARP(91,1.); | |
195 | SetPARP(93,5.); | |
196 | // | |
197 | break; | |
198 | case kPyBeauty: | |
199 | SetMSEL(5); | |
200 | SetPMAS(5,1,4.75); | |
8d2cd130 | 201 | break; |
202 | case kPyJpsi: | |
203 | SetMSEL(0); | |
204 | // gg->J/Psi g | |
205 | SetMSUB(86,1); | |
206 | break; | |
207 | case kPyJpsiChi: | |
208 | SetMSEL(0); | |
209 | // gg->J/Psi g | |
210 | SetMSUB(86,1); | |
211 | // gg-> chi_0c g | |
212 | SetMSUB(87,1); | |
213 | // gg-> chi_1c g | |
214 | SetMSUB(88,1); | |
215 | // gg-> chi_2c g | |
216 | SetMSUB(89,1); | |
217 | break; | |
218 | case kPyCharmUnforced: | |
219 | SetMSEL(0); | |
220 | // gq->qg | |
221 | SetMSUB(28,1); | |
222 | // gg->qq | |
223 | SetMSUB(53,1); | |
224 | // gg->gg | |
225 | SetMSUB(68,1); | |
226 | break; | |
227 | case kPyBeautyUnforced: | |
228 | SetMSEL(0); | |
229 | // gq->qg | |
230 | SetMSUB(28,1); | |
231 | // gg->qq | |
232 | SetMSUB(53,1); | |
233 | // gg->gg | |
234 | SetMSUB(68,1); | |
235 | break; | |
236 | case kPyMb: | |
237 | // Minimum Bias pp-Collisions | |
238 | // | |
239 | // | |
240 | // select Pythia min. bias model | |
241 | SetMSEL(0); | |
511db649 | 242 | SetMSUB(92,1); // single diffraction AB-->XB |
243 | SetMSUB(93,1); // single diffraction AB-->AX | |
244 | SetMSUB(94,1); // double diffraction | |
245 | SetMSUB(95,1); // low pt production | |
246 | ||
e0e89f40 | 247 | AtlasTuning(); |
f529e69b | 248 | break; |
04081a91 | 249 | |
250 | case kPyMbWithDirectPhoton: | |
251 | // Minimum Bias pp-Collisions with direct photon processes added | |
252 | // | |
253 | // | |
254 | // select Pythia min. bias model | |
255 | SetMSEL(0); | |
256 | SetMSUB(92,1); // single diffraction AB-->XB | |
257 | SetMSUB(93,1); // single diffraction AB-->AX | |
258 | SetMSUB(94,1); // double diffraction | |
259 | SetMSUB(95,1); // low pt production | |
260 | ||
261 | SetMSUB(14,1); // | |
262 | SetMSUB(18,1); // | |
263 | SetMSUB(29,1); // | |
264 | SetMSUB(114,1); // | |
265 | SetMSUB(115,1); // | |
266 | ||
267 | ||
268 | AtlasTuning(); | |
269 | break; | |
270 | ||
f529e69b | 271 | case kPyMbDefault: |
272 | // Minimum Bias pp-Collisions | |
273 | // | |
274 | // | |
275 | // select Pythia min. bias model | |
276 | SetMSEL(0); | |
277 | SetMSUB(92,1); // single diffraction AB-->XB | |
278 | SetMSUB(93,1); // single diffraction AB-->AX | |
279 | SetMSUB(94,1); // double diffraction | |
280 | SetMSUB(95,1); // low pt production | |
281 | ||
0a0cbcfd | 282 | break; |
283 | case kPyLhwgMb: | |
284 | // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120 | |
285 | // -> Pythia 6.3 or above is needed | |
286 | // | |
287 | SetMSEL(0); | |
288 | SetMSUB(92,1); // single diffraction AB-->XB | |
289 | SetMSUB(93,1); // single diffraction AB-->AX | |
290 | SetMSUB(94,1); // double diffraction | |
291 | SetMSUB(95,1); // low pt production | |
292 | ||
e2de0ce1 | 293 | SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf |
0a0cbcfd | 294 | SetMSTP(52,2); |
295 | SetMSTP(68,1); | |
296 | SetMSTP(70,2); | |
297 | SetMSTP(81,1); // Multiple Interactions ON | |
298 | SetMSTP(82,4); // Double Gaussian Model | |
299 | SetMSTP(88,1); | |
300 | ||
301 | SetPARP(82,2.3); // [GeV] PT_min at Ref. energy | |
302 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
303 | SetPARP(84,0.5); // Core radius | |
304 | SetPARP(85,0.9); // Regulates gluon prod. mechanism | |
305 | SetPARP(90,0.2); // 2*epsilon (exponent in power law) | |
306 | ||
511db649 | 307 | break; |
8d2cd130 | 308 | case kPyMbNonDiffr: |
309 | // Minimum Bias pp-Collisions | |
310 | // | |
311 | // | |
312 | // select Pythia min. bias model | |
313 | SetMSEL(0); | |
511db649 | 314 | SetMSUB(95,1); // low pt production |
0f482ae4 | 315 | |
d7de4a67 | 316 | AtlasTuning(); |
317 | break; | |
318 | case kPyMbMSEL1: | |
319 | ConfigHeavyFlavor(); | |
320 | // Intrinsic <kT^2> | |
321 | SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons | |
322 | SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2 | |
323 | SetPARP(93,5.); // Upper cut-off | |
324 | // Set Q-quark mass | |
325 | SetPMAS(4,1,1.2); // Charm quark mass | |
326 | SetPMAS(5,1,4.78); // Beauty quark mass | |
327 | SetPARP(71,4.); // Defaut value | |
328 | // Atlas Tuning | |
e0e89f40 | 329 | AtlasTuning(); |
8d2cd130 | 330 | break; |
331 | case kPyJets: | |
332 | // | |
333 | // QCD Jets | |
334 | // | |
335 | SetMSEL(1); | |
65f2626c | 336 | // Pythia Tune A (CDF) |
337 | // | |
4167b79f | 338 | SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis) |
65f2626c | 339 | SetMSTP(82,4); // Double Gaussian Model |
340 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy | |
341 | SetPARP(84,0.4); // Core radius | |
342 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism | |
343 | SetPARP(86,0.95); // Regulates gluon prod. mechanism | |
344 | SetPARP(89,1800.); // [GeV] Ref. energy | |
345 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) | |
346 | break; | |
8d2cd130 | 347 | case kPyDirectGamma: |
348 | SetMSEL(10); | |
349 | break; | |
adf4d898 | 350 | case kPyCharmPbPbMNR: |
351 | case kPyD0PbPbMNR: | |
90d7b703 | 352 | case kPyDPlusPbPbMNR: |
e0e89f40 | 353 | case kPyDPlusStrangePbPbMNR: |
90d7b703 | 354 | // Tuning of Pythia parameters aimed to get a resonable agreement |
355 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
356 | // c-cbar single inclusive and double differential distributions. | |
357 | // This parameter settings are meant to work with Pb-Pb collisions | |
358 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
359 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
360 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 361 | ConfigHeavyFlavor(); |
90d7b703 | 362 | // Intrinsic <kT> |
363 | SetMSTP(91,1); | |
364 | SetPARP(91,1.304); | |
365 | SetPARP(93,6.52); | |
90d7b703 | 366 | // Set c-quark mass |
367 | SetPMAS(4,1,1.2); | |
8d2cd130 | 368 | break; |
adf4d898 | 369 | case kPyCharmpPbMNR: |
370 | case kPyD0pPbMNR: | |
90d7b703 | 371 | case kPyDPluspPbMNR: |
e0e89f40 | 372 | case kPyDPlusStrangepPbMNR: |
90d7b703 | 373 | // Tuning of Pythia parameters aimed to get a resonable agreement |
374 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
375 | // c-cbar single inclusive and double differential distributions. | |
376 | // This parameter settings are meant to work with p-Pb collisions | |
377 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
378 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
379 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 380 | ConfigHeavyFlavor(); |
90d7b703 | 381 | // Intrinsic <kT> |
3dc3ec94 | 382 | SetMSTP(91,1); |
383 | SetPARP(91,1.16); | |
384 | SetPARP(93,5.8); | |
385 | ||
90d7b703 | 386 | // Set c-quark mass |
3dc3ec94 | 387 | SetPMAS(4,1,1.2); |
adf4d898 | 388 | break; |
389 | case kPyCharmppMNR: | |
390 | case kPyD0ppMNR: | |
90d7b703 | 391 | case kPyDPlusppMNR: |
e0e89f40 | 392 | case kPyDPlusStrangeppMNR: |
90d7b703 | 393 | // Tuning of Pythia parameters aimed to get a resonable agreement |
394 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
395 | // c-cbar single inclusive and double differential distributions. | |
396 | // This parameter settings are meant to work with pp collisions | |
397 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
398 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
399 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 400 | ConfigHeavyFlavor(); |
90d7b703 | 401 | // Intrinsic <kT^2> |
3dc3ec94 | 402 | SetMSTP(91,1); |
403 | SetPARP(91,1.); | |
404 | SetPARP(93,5.); | |
405 | ||
90d7b703 | 406 | // Set c-quark mass |
3dc3ec94 | 407 | SetPMAS(4,1,1.2); |
adf4d898 | 408 | break; |
e0e89f40 | 409 | case kPyCharmppMNRwmi: |
410 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
411 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
412 | // c-cbar single inclusive and double differential distributions. | |
413 | // This parameter settings are meant to work with pp collisions | |
414 | // and with kCTEQ5L PDFs. | |
415 | // Added multiple interactions according to ATLAS tune settings. | |
416 | // To get a "reasonable" agreement with MNR results, events have to be | |
417 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
418 | // set to 2.76 GeV. | |
419 | // To get a "perfect" agreement with MNR results, events have to be | |
420 | // generated in four ptHard bins with the following relative | |
421 | // normalizations: | |
422 | // 2.76-3 GeV: 25% | |
423 | // 3-4 GeV: 40% | |
424 | // 4-8 GeV: 29% | |
425 | // >8 GeV: 6% | |
426 | ConfigHeavyFlavor(); | |
427 | // Intrinsic <kT^2> | |
428 | SetMSTP(91,1); | |
429 | SetPARP(91,1.); | |
430 | SetPARP(93,5.); | |
431 | ||
432 | // Set c-quark mass | |
433 | SetPMAS(4,1,1.2); | |
434 | AtlasTuning(); | |
435 | break; | |
adf4d898 | 436 | case kPyBeautyPbPbMNR: |
8d2cd130 | 437 | // Tuning of Pythia parameters aimed to get a resonable agreement |
438 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
439 | // b-bbar single inclusive and double differential distributions. | |
440 | // This parameter settings are meant to work with Pb-Pb collisions | |
441 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
442 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
443 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 444 | ConfigHeavyFlavor(); |
8d2cd130 | 445 | // QCD scales |
3dc3ec94 | 446 | SetPARP(67,1.0); |
447 | SetPARP(71,1.0); | |
adf4d898 | 448 | // Intrinsic <kT> |
3dc3ec94 | 449 | SetMSTP(91,1); |
450 | SetPARP(91,2.035); | |
451 | SetPARP(93,10.17); | |
8d2cd130 | 452 | // Set b-quark mass |
3dc3ec94 | 453 | SetPMAS(5,1,4.75); |
adf4d898 | 454 | break; |
455 | case kPyBeautypPbMNR: | |
456 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
457 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
458 | // b-bbar single inclusive and double differential distributions. | |
459 | // This parameter settings are meant to work with p-Pb collisions | |
460 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
461 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
462 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 463 | ConfigHeavyFlavor(); |
adf4d898 | 464 | // QCD scales |
3dc3ec94 | 465 | SetPARP(67,1.0); |
466 | SetPARP(71,1.0); | |
adf4d898 | 467 | // Intrinsic <kT> |
3dc3ec94 | 468 | SetMSTP(91,1); |
469 | SetPARP(91,1.60); | |
470 | SetPARP(93,8.00); | |
adf4d898 | 471 | // Set b-quark mass |
3dc3ec94 | 472 | SetPMAS(5,1,4.75); |
adf4d898 | 473 | break; |
474 | case kPyBeautyppMNR: | |
475 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
476 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
477 | // b-bbar single inclusive and double differential distributions. | |
478 | // This parameter settings are meant to work with pp collisions | |
479 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
480 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
481 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 482 | ConfigHeavyFlavor(); |
adf4d898 | 483 | // QCD scales |
3dc3ec94 | 484 | SetPARP(67,1.0); |
485 | SetPARP(71,1.0); | |
486 | ||
487 | // Intrinsic <kT> | |
488 | SetMSTP(91,1); | |
489 | SetPARP(91,1.); | |
490 | SetPARP(93,5.); | |
491 | ||
492 | // Set b-quark mass | |
493 | SetPMAS(5,1,4.75); | |
8d2cd130 | 494 | break; |
e0e89f40 | 495 | case kPyBeautyppMNRwmi: |
496 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
497 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
498 | // b-bbar single inclusive and double differential distributions. | |
499 | // This parameter settings are meant to work with pp collisions | |
500 | // and with kCTEQ5L PDFs. | |
501 | // Added multiple interactions according to ATLAS tune settings. | |
502 | // To get a "reasonable" agreement with MNR results, events have to be | |
503 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
504 | // set to 2.76 GeV. | |
505 | // To get a "perfect" agreement with MNR results, events have to be | |
506 | // generated in four ptHard bins with the following relative | |
507 | // normalizations: | |
508 | // 2.76-4 GeV: 5% | |
509 | // 4-6 GeV: 31% | |
510 | // 6-8 GeV: 28% | |
511 | // >8 GeV: 36% | |
512 | ConfigHeavyFlavor(); | |
513 | // QCD scales | |
514 | SetPARP(67,1.0); | |
515 | SetPARP(71,1.0); | |
516 | ||
517 | // Intrinsic <kT> | |
518 | SetMSTP(91,1); | |
519 | SetPARP(91,1.); | |
520 | SetPARP(93,5.); | |
521 | ||
522 | // Set b-quark mass | |
523 | SetPMAS(5,1,4.75); | |
524 | ||
525 | AtlasTuning(); | |
526 | break; | |
589380c6 | 527 | case kPyW: |
528 | ||
529 | //Inclusive production of W+/- | |
530 | SetMSEL(0); | |
531 | //f fbar -> W+ | |
532 | SetMSUB(2,1); | |
533 | // //f fbar -> g W+ | |
534 | // SetMSUB(16,1); | |
535 | // //f fbar -> gamma W+ | |
536 | // SetMSUB(20,1); | |
537 | // //f g -> f W+ | |
538 | // SetMSUB(31,1); | |
539 | // //f gamma -> f W+ | |
540 | // SetMSUB(36,1); | |
541 | ||
542 | // Initial/final parton shower on (Pythia default) | |
543 | // With parton showers on we are generating "W inclusive process" | |
544 | SetMSTP(61,1); //Initial QCD & QED showers on | |
545 | SetMSTP(71,1); //Final QCD & QED showers on | |
546 | ||
547 | break; | |
0f6ee828 | 548 | |
549 | case kPyZ: | |
550 | ||
551 | //Inclusive production of Z | |
552 | SetMSEL(0); | |
553 | //f fbar -> Z/gamma | |
554 | SetMSUB(1,1); | |
555 | ||
556 | // // f fbar -> g Z/gamma | |
557 | // SetMSUB(15,1); | |
558 | // // f fbar -> gamma Z/gamma | |
559 | // SetMSUB(19,1); | |
560 | // // f g -> f Z/gamma | |
561 | // SetMSUB(30,1); | |
562 | // // f gamma -> f Z/gamma | |
563 | // SetMSUB(35,1); | |
564 | ||
565 | //only Z included, not gamma | |
566 | SetMSTP(43,2); | |
567 | ||
568 | // Initial/final parton shower on (Pythia default) | |
569 | // With parton showers on we are generating "Z inclusive process" | |
570 | SetMSTP(61,1); //Initial QCD & QED showers on | |
571 | SetMSTP(71,1); //Final QCD & QED showers on | |
572 | ||
573 | break; | |
574 | ||
8d2cd130 | 575 | } |
576 | // | |
577 | // Initialize PYTHIA | |
578 | SetMSTP(41,1); // all resonance decays switched on | |
8d2cd130 | 579 | Initialize("CMS","p","p",fEcms); |
4167b79f | 580 | |
8d2cd130 | 581 | } |
582 | ||
583 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
584 | { | |
585 | // Check Lund particle code (for debugging) | |
586 | Int_t kc=Pycomp(kf); | |
587 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
588 | return kc; | |
589 | } | |
590 | ||
20e47f08 | 591 | void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf) |
8d2cd130 | 592 | { |
593 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
594 | // The MSTP array in the PYPARS common block is used to enable and | |
595 | // select the nuclear structure functions. | |
596 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
597 | // =1: internal PYTHIA acording to MSTP(51) | |
598 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
599 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
600 | // MSTP(192) : Mass number of nucleus side 1 | |
601 | // MSTP(193) : Mass number of nucleus side 2 | |
20e47f08 | 602 | // MSTP(194) : Nuclear structure function: 0: EKS98 1:EPS08 |
8d2cd130 | 603 | SetMSTP(52,2); |
604 | SetMSTP(192, a1); | |
20e47f08 | 605 | SetMSTP(193, a2); |
606 | SetMSTP(194, pdf); | |
8d2cd130 | 607 | } |
608 | ||
609 | ||
610 | AliPythia* AliPythia::Instance() | |
611 | { | |
612 | // Set random number generator | |
613 | if (fgAliPythia) { | |
614 | return fgAliPythia; | |
615 | } else { | |
616 | fgAliPythia = new AliPythia(); | |
617 | return fgAliPythia; | |
618 | } | |
619 | } | |
620 | ||
621 | void AliPythia::PrintParticles() | |
622 | { | |
623 | // Print list of particl properties | |
624 | Int_t np = 0; | |
c31f1d37 | 625 | char* name = new char[16]; |
8d2cd130 | 626 | for (Int_t kf=0; kf<1000000; kf++) { |
627 | for (Int_t c = 1; c > -2; c-=2) { | |
8d2cd130 | 628 | Int_t kc = Pycomp(c*kf); |
629 | if (kc) { | |
630 | Float_t mass = GetPMAS(kc,1); | |
631 | Float_t width = GetPMAS(kc,2); | |
632 | Float_t tau = GetPMAS(kc,4); | |
c31f1d37 | 633 | |
8d2cd130 | 634 | Pyname(kf,name); |
635 | ||
636 | np++; | |
637 | ||
638 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
639 | c*kf, name, mass, width, tau); | |
640 | } | |
641 | } | |
642 | } | |
643 | printf("\n Number of particles %d \n \n", np); | |
644 | } | |
645 | ||
646 | void AliPythia::ResetDecayTable() | |
647 | { | |
648 | // Set default values for pythia decay switches | |
649 | Int_t i; | |
650 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
651 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
652 | } | |
653 | ||
654 | void AliPythia::SetDecayTable() | |
655 | { | |
656 | // Set default values for pythia decay switches | |
657 | // | |
658 | Int_t i; | |
659 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
660 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
661 | } | |
662 | ||
663 | void AliPythia::Pyclus(Int_t& njet) | |
664 | { | |
665 | // Call Pythia clustering algorithm | |
666 | // | |
667 | pyclus(njet); | |
668 | } | |
669 | ||
670 | void AliPythia::Pycell(Int_t& njet) | |
671 | { | |
672 | // Call Pythia jet reconstruction algorithm | |
673 | // | |
674 | pycell(njet); | |
675 | } | |
676 | ||
452af8c7 | 677 | void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) |
678 | { | |
679 | // Call Pythia jet reconstruction algorithm | |
680 | // | |
452af8c7 | 681 | pyshow(ip1, ip2, qmax); |
682 | } | |
683 | ||
684 | void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) | |
685 | { | |
686 | pyrobo(imi, ima, the, phi, bex, bey, bez); | |
687 | } | |
688 | ||
689 | ||
690 | ||
32c8e463 | 691 | void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax) |
0f482ae4 | 692 | { |
693 | // Initializes | |
694 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann | |
695 | // (2) The nuclear geometry using the Glauber Model | |
696 | // | |
6b435cde | 697 | |
18b7a4a1 | 698 | fGlauber = AliFastGlauber::Instance(); |
0f482ae4 | 699 | fGlauber->Init(2); |
700 | fGlauber->SetCentralityClass(cMin, cMax); | |
701 | ||
702 | fQuenchingWeights = new AliQuenchingWeights(); | |
703 | fQuenchingWeights->InitMult(); | |
86b6ad68 | 704 | fQuenchingWeights->SetK(k); |
0f482ae4 | 705 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); |
32c8e463 | 706 | fNGmax = ngmax; |
707 | fZmax = zmax; | |
708 | ||
0f482ae4 | 709 | } |
710 | ||
711 | ||
452af8c7 | 712 | void AliPythia::Quench() |
713 | { | |
714 | // | |
715 | // | |
716 | // Simple Jet Quenching routine: | |
717 | // ============================= | |
718 | // The jet formed by all final state partons radiated by the parton created | |
0f482ae4 | 719 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in |
720 | // the initial parton reference frame: | |
452af8c7 | 721 | // (E + p_z)new = (1-z) (E + p_z)old |
722 | // | |
0f482ae4 | 723 | // |
724 | // | |
725 | // | |
452af8c7 | 726 | // The lost momentum is first balanced by one gluon with virtuality > 0. |
727 | // Subsequently the gluon splits to yield two gluons with E = p. | |
728 | // | |
0f482ae4 | 729 | // |
730 | // | |
4e383037 | 731 | static Float_t eMean = 0.; |
732 | static Int_t icall = 0; | |
0f482ae4 | 733 | |
c2c598a3 | 734 | Double_t p0[4][5]; |
735 | Double_t p1[4][5]; | |
736 | Double_t p2[4][5]; | |
737 | Int_t klast[4] = {-1, -1, -1, -1}; | |
452af8c7 | 738 | |
739 | Int_t numpart = fPyjets->N; | |
86b6ad68 | 740 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; |
c2c598a3 | 741 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; |
742 | Bool_t quenched[4]; | |
b280c4cc | 743 | Double_t wjtKick[4]; |
c2c598a3 | 744 | Int_t nGluon[4]; |
86b6ad68 | 745 | Int_t qPdg[4]; |
0f482ae4 | 746 | Int_t imo, kst, pdg; |
b280c4cc | 747 | |
511db649 | 748 | // |
c2c598a3 | 749 | // Sore information about Primary partons |
750 | // | |
751 | // j = | |
752 | // 0, 1 partons from hard scattering | |
753 | // 2, 3 partons from initial state radiation | |
754 | // | |
755 | for (Int_t i = 2; i <= 7; i++) { | |
756 | Int_t j = 0; | |
757 | // Skip gluons that participate in hard scattering | |
758 | if (i == 4 || i == 5) continue; | |
759 | // Gluons from hard Scattering | |
760 | if (i == 6 || i == 7) { | |
761 | j = i - 6; | |
762 | pxq[j] = fPyjets->P[0][i]; | |
763 | pyq[j] = fPyjets->P[1][i]; | |
764 | pzq[j] = fPyjets->P[2][i]; | |
765 | eq[j] = fPyjets->P[3][i]; | |
766 | mq[j] = fPyjets->P[4][i]; | |
767 | } else { | |
768 | // Gluons from initial state radiation | |
769 | // | |
770 | // Obtain 4-momentum vector from difference between original parton and parton after gluon | |
771 | // radiation. Energy is calculated independently because initial state radition does not | |
772 | // conserve strictly momentum and energy for each partonic system independently. | |
773 | // | |
774 | // Not very clean. Should be improved ! | |
775 | // | |
776 | // | |
777 | j = i; | |
778 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; | |
779 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; | |
780 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; | |
781 | mq[j] = fPyjets->P[4][i]; | |
782 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); | |
783 | } | |
784 | // | |
785 | // Calculate some kinematic variables | |
511db649 | 786 | // |
4e383037 | 787 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); |
0f482ae4 | 788 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); |
789 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); | |
790 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); | |
791 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); | |
86b6ad68 | 792 | qPdg[j] = fPyjets->K[1][i]; |
793 | } | |
794 | ||
795 | Double_t int0[4]; | |
796 | Double_t int1[4]; | |
86b6ad68 | 797 | |
b280c4cc | 798 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); |
799 | ||
86b6ad68 | 800 | for (Int_t j = 0; j < 4; j++) { |
c2c598a3 | 801 | // |
802 | // Quench only central jets and with E > 10. | |
803 | // | |
86b6ad68 | 804 | |
805 | ||
806 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; | |
807 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); | |
808 | ||
c2c598a3 | 809 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { |
b280c4cc | 810 | fZQuench[j] = 0.; |
0f482ae4 | 811 | } else { |
c2c598a3 | 812 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { |
4e383037 | 813 | icall ++; |
814 | eMean += eloss; | |
815 | } | |
0f482ae4 | 816 | // |
817 | // Extra pt | |
86b6ad68 | 818 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); |
819 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); | |
0f482ae4 | 820 | // |
821 | // Fractional energy loss | |
b280c4cc | 822 | fZQuench[j] = eloss / eq[j]; |
0f482ae4 | 823 | // |
824 | // Avoid complete loss | |
825 | // | |
1044c4d8 | 826 | if (fZQuench[j] > fZmax) fZQuench[j] = fZmax; |
0f482ae4 | 827 | // |
828 | // Some debug printing | |
86b6ad68 | 829 | |
830 | ||
bf9bb016 | 831 | // 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", |
832 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); | |
4e383037 | 833 | |
b280c4cc | 834 | // fZQuench[j] = 0.8; |
835 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); | |
0f482ae4 | 836 | } |
4e383037 | 837 | |
b280c4cc | 838 | quenched[j] = (fZQuench[j] > 0.01); |
4e383037 | 839 | } // primary partons |
c2c598a3 | 840 | |
b280c4cc | 841 | |
842 | ||
6e90ad26 | 843 | Double_t pNew[1000][4]; |
844 | Int_t kNew[1000]; | |
845 | Int_t icount = 0; | |
b280c4cc | 846 | Double_t zquench[4]; |
847 | ||
6e90ad26 | 848 | // |
4e383037 | 849 | // System Loop |
c2c598a3 | 850 | for (Int_t isys = 0; isys < 4; isys++) { |
6e90ad26 | 851 | // Skip to next system if not quenched. |
4e383037 | 852 | if (!quenched[isys]) continue; |
853 | ||
b280c4cc | 854 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); |
32c8e463 | 855 | if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax; |
b280c4cc | 856 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); |
4e383037 | 857 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); |
0f482ae4 | 858 | |
4e383037 | 859 | |
860 | ||
861 | Int_t igMin = -1; | |
862 | Int_t igMax = -1; | |
863 | Double_t pg[4] = {0., 0., 0., 0.}; | |
864 | ||
865 | // | |
866 | // Loop on radiation events | |
867 | ||
868 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { | |
6e90ad26 | 869 | while (1) { |
870 | icount = 0; | |
871 | for (Int_t k = 0; k < 4; k++) | |
872 | { | |
873 | p0[isys][k] = 0.; | |
874 | p1[isys][k] = 0.; | |
875 | p2[isys][k] = 0.; | |
876 | } | |
877 | // Loop over partons | |
878 | for (Int_t i = 0; i < numpart; i++) | |
879 | { | |
880 | imo = fPyjets->K[2][i]; | |
881 | kst = fPyjets->K[0][i]; | |
882 | pdg = fPyjets->K[1][i]; | |
883 | ||
884 | ||
885 | ||
0f482ae4 | 886 | // Quarks and gluons only |
6e90ad26 | 887 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; |
0f482ae4 | 888 | // Particles from hard scattering only |
c2c598a3 | 889 | |
6e90ad26 | 890 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; |
c2c598a3 | 891 | Int_t imom = imo % 1000; |
892 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; | |
893 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; | |
894 | ||
6e90ad26 | 895 | |
0f482ae4 | 896 | // Skip comment lines |
6e90ad26 | 897 | if (kst != 1 && kst != 2) continue; |
0f482ae4 | 898 | // |
899 | // Parton kinematic | |
6e90ad26 | 900 | px = fPyjets->P[0][i]; |
901 | py = fPyjets->P[1][i]; | |
902 | pz = fPyjets->P[2][i]; | |
903 | e = fPyjets->P[3][i]; | |
904 | m = fPyjets->P[4][i]; | |
905 | pt = TMath::Sqrt(px * px + py * py); | |
906 | p = TMath::Sqrt(px * px + py * py + pz * pz); | |
907 | phi = TMath::Pi() + TMath::ATan2(-py, -px); | |
908 | theta = TMath::ATan2(pt, pz); | |
909 | ||
0f482ae4 | 910 | // |
c2c598a3 | 911 | // Save 4-momentum sum for balancing |
912 | Int_t index = isys; | |
6e90ad26 | 913 | |
914 | p0[index][0] += px; | |
915 | p0[index][1] += py; | |
916 | p0[index][2] += pz; | |
917 | p0[index][3] += e; | |
6e90ad26 | 918 | |
919 | klast[index] = i; | |
920 | ||
0f482ae4 | 921 | // |
922 | // Fractional energy loss | |
b280c4cc | 923 | Double_t z = zquench[index]; |
4e383037 | 924 | |
c2c598a3 | 925 | |
4e383037 | 926 | // Don't fully quench radiated gluons |
927 | // | |
928 | if (imo > 1000) { | |
929 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination | |
930 | // | |
931 | ||
c2c598a3 | 932 | z = 0.02; |
4e383037 | 933 | } |
c2c598a3 | 934 | // printf("z: %d %f\n", imo, z); |
935 | ||
4e383037 | 936 | |
937 | // | |
6e90ad26 | 938 | |
939 | // | |
940 | // | |
941 | // Transform into frame in which initial parton is along z-axis | |
942 | // | |
943 | TVector3 v(px, py, pz); | |
944 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); | |
945 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); | |
946 | ||
947 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); | |
948 | Double_t mt2 = jt * jt + m * m; | |
949 | Double_t zmax = 1.; | |
950 | // | |
951 | // Kinematic limit on z | |
952 | // | |
4e383037 | 953 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); |
6e90ad26 | 954 | // |
955 | // Change light-cone kinematics rel. to initial parton | |
956 | // | |
957 | Double_t eppzOld = e + pl; | |
958 | Double_t empzOld = e - pl; | |
959 | ||
960 | Double_t eppzNew = (1. - z) * eppzOld; | |
961 | Double_t empzNew = empzOld - mt2 * z / eppzOld; | |
962 | Double_t eNew = 0.5 * (eppzNew + empzNew); | |
963 | Double_t plNew = 0.5 * (eppzNew - empzNew); | |
964 | ||
965 | Double_t jtNew; | |
966 | // | |
967 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 | |
968 | Double_t mt2New = eppzNew * empzNew; | |
969 | if (mt2New < 1.e-8) mt2New = 0.; | |
4e383037 | 970 | if (z < zmax) { |
971 | if (m * m > mt2New) { | |
972 | // | |
973 | // This should not happen | |
974 | // | |
975 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); | |
976 | jtNew = 0; | |
977 | } else { | |
978 | jtNew = TMath::Sqrt(mt2New - m * m); | |
979 | } | |
6e90ad26 | 980 | } else { |
4e383037 | 981 | // If pT is to small (probably a leading massive particle) we scale only the energy |
982 | // This can cause negative masses of the radiated gluon | |
983 | // Let's hope for the best ... | |
984 | jtNew = jt; | |
985 | eNew = TMath::Sqrt(plNew * plNew + mt2); | |
986 | ||
6e90ad26 | 987 | } |
6e90ad26 | 988 | // |
989 | // Calculate new px, py | |
990 | // | |
b07be423 | 991 | Double_t pxNew = 0; |
992 | Double_t pyNew = 0; | |
6e90ad26 | 993 | |
b07be423 | 994 | if (jt>0) { |
6b118b3c | 995 | pxNew = jtNew / jt * pxs; |
996 | pyNew = jtNew / jt * pys; | |
b07be423 | 997 | } |
6e90ad26 | 998 | // Double_t dpx = pxs - pxNew; |
999 | // Double_t dpy = pys - pyNew; | |
1000 | // Double_t dpz = pl - plNew; | |
1001 | // Double_t de = e - eNew; | |
1002 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; | |
1003 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); | |
1004 | // printf("New mass (2) %e %e \n", pxNew, pyNew); | |
1005 | // | |
1006 | // Rotate back | |
1007 | // | |
1008 | TVector3 w(pxNew, pyNew, plNew); | |
1009 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); | |
1010 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); | |
1011 | ||
1012 | p1[index][0] += pxNew; | |
1013 | p1[index][1] += pyNew; | |
1014 | p1[index][2] += plNew; | |
1015 | p1[index][3] += eNew; | |
1016 | // | |
1017 | // Updated 4-momentum vectors | |
1018 | // | |
1019 | pNew[icount][0] = pxNew; | |
1020 | pNew[icount][1] = pyNew; | |
1021 | pNew[icount][2] = plNew; | |
1022 | pNew[icount][3] = eNew; | |
1023 | kNew[icount] = i; | |
1024 | icount++; | |
1025 | } // parton loop | |
0f482ae4 | 1026 | // |
6e90ad26 | 1027 | // Check if there was phase-space for quenching |
0f482ae4 | 1028 | // |
0f482ae4 | 1029 | |
6e90ad26 | 1030 | if (icount == 0) quenched[isys] = kFALSE; |
1031 | if (!quenched[isys]) break; | |
1032 | ||
1033 | for (Int_t j = 0; j < 4; j++) | |
1034 | { | |
1035 | p2[isys][j] = p0[isys][j] - p1[isys][j]; | |
1036 | } | |
1037 | 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 | 1038 | if (p2[isys][4] > 0.) { |
1039 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); | |
1040 | break; | |
1041 | } else { | |
b280c4cc | 1042 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); |
4e383037 | 1043 | 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 | 1044 | if (p2[isys][4] < -0.01) { |
4e383037 | 1045 | printf("Negative mass squared !\n"); |
1046 | // Here we have to put the gluon back to mass shell | |
1047 | // This will lead to a small energy imbalance | |
1048 | p2[isys][4] = 0.; | |
1049 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); | |
1050 | break; | |
6e90ad26 | 1051 | } else { |
1052 | p2[isys][4] = 0.; | |
1053 | break; | |
1054 | } | |
1055 | } | |
6e90ad26 | 1056 | /* |
6e90ad26 | 1057 | zHeavy *= 0.98; |
1058 | printf("zHeavy lowered to %f\n", zHeavy); | |
1059 | if (zHeavy < 0.01) { | |
1060 | printf("No success ! \n"); | |
1061 | icount = 0; | |
1062 | quenched[isys] = kFALSE; | |
1063 | break; | |
1064 | } | |
4e383037 | 1065 | */ |
1066 | } // iteration on z (while) | |
1067 | ||
6e90ad26 | 1068 | // Update event record |
1069 | for (Int_t k = 0; k < icount; k++) { | |
1070 | // 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] ); | |
1071 | fPyjets->P[0][kNew[k]] = pNew[k][0]; | |
1072 | fPyjets->P[1][kNew[k]] = pNew[k][1]; | |
1073 | fPyjets->P[2][kNew[k]] = pNew[k][2]; | |
1074 | fPyjets->P[3][kNew[k]] = pNew[k][3]; | |
0f482ae4 | 1075 | } |
4e383037 | 1076 | // |
1077 | // Add the gluons | |
1078 | // | |
1079 | Int_t ish = 0; | |
1837e95c | 1080 | Int_t iGlu; |
4e383037 | 1081 | if (!quenched[isys]) continue; |
0f482ae4 | 1082 | // |
1083 | // Last parton from shower i | |
4e383037 | 1084 | Int_t in = klast[isys]; |
0f482ae4 | 1085 | // |
1086 | // Continue if no parton in shower i selected | |
1087 | if (in == -1) continue; | |
1088 | // | |
1089 | // If this is the second initial parton and it is behind the first move pointer by previous ish | |
4e383037 | 1090 | if (isys == 1 && klast[1] > klast[0]) in += ish; |
0f482ae4 | 1091 | // |
1092 | // Starting index | |
452af8c7 | 1093 | |
4e383037 | 1094 | // jmin = in - 1; |
0f482ae4 | 1095 | // How many additional gluons will be generated |
1096 | ish = 1; | |
4e383037 | 1097 | if (p2[isys][4] > 0.05) ish = 2; |
0f482ae4 | 1098 | // |
1099 | // Position of gluons | |
4e383037 | 1100 | iGlu = numpart; |
1101 | if (iglu == 0) igMin = iGlu; | |
1102 | igMax = iGlu; | |
0f482ae4 | 1103 | numpart += ish; |
1104 | (fPyjets->N) += ish; | |
4e383037 | 1105 | |
0f482ae4 | 1106 | if (ish == 1) { |
4e383037 | 1107 | fPyjets->P[0][iGlu] = p2[isys][0]; |
1108 | fPyjets->P[1][iGlu] = p2[isys][1]; | |
1109 | fPyjets->P[2][iGlu] = p2[isys][2]; | |
1110 | fPyjets->P[3][iGlu] = p2[isys][3]; | |
1111 | fPyjets->P[4][iGlu] = p2[isys][4]; | |
0f482ae4 | 1112 | |
4e383037 | 1113 | fPyjets->K[0][iGlu] = 1; |
1114 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; | |
0f482ae4 | 1115 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1116 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1117 | fPyjets->K[3][iGlu] = -1; |
1118 | fPyjets->K[4][iGlu] = -1; | |
4e383037 | 1119 | |
1120 | pg[0] += p2[isys][0]; | |
1121 | pg[1] += p2[isys][1]; | |
1122 | pg[2] += p2[isys][2]; | |
1123 | pg[3] += p2[isys][3]; | |
0f482ae4 | 1124 | } else { |
1125 | // | |
1126 | // Split gluon in rest frame. | |
1127 | // | |
4e383037 | 1128 | Double_t bx = p2[isys][0] / p2[isys][3]; |
1129 | Double_t by = p2[isys][1] / p2[isys][3]; | |
1130 | Double_t bz = p2[isys][2] / p2[isys][3]; | |
1131 | Double_t pst = p2[isys][4] / 2.; | |
0f482ae4 | 1132 | // |
1133 | // Isotropic decay ???? | |
1134 | Double_t cost = 2. * gRandom->Rndm() - 1.; | |
60e55aee | 1135 | Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost)); |
2ab330c9 | 1136 | Double_t phis = 2. * TMath::Pi() * gRandom->Rndm(); |
0f482ae4 | 1137 | |
1138 | Double_t pz1 = pst * cost; | |
1139 | Double_t pz2 = -pst * cost; | |
1140 | Double_t pt1 = pst * sint; | |
1141 | Double_t pt2 = -pst * sint; | |
2ab330c9 | 1142 | Double_t px1 = pt1 * TMath::Cos(phis); |
1143 | Double_t py1 = pt1 * TMath::Sin(phis); | |
1144 | Double_t px2 = pt2 * TMath::Cos(phis); | |
1145 | Double_t py2 = pt2 * TMath::Sin(phis); | |
0f482ae4 | 1146 | |
1147 | fPyjets->P[0][iGlu] = px1; | |
1148 | fPyjets->P[1][iGlu] = py1; | |
1149 | fPyjets->P[2][iGlu] = pz1; | |
1150 | fPyjets->P[3][iGlu] = pst; | |
1151 | fPyjets->P[4][iGlu] = 0.; | |
1152 | ||
4e383037 | 1153 | fPyjets->K[0][iGlu] = 1 ; |
0f482ae4 | 1154 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1155 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1156 | fPyjets->K[3][iGlu] = -1; |
1157 | fPyjets->K[4][iGlu] = -1; | |
1158 | ||
1159 | fPyjets->P[0][iGlu+1] = px2; | |
1160 | fPyjets->P[1][iGlu+1] = py2; | |
1161 | fPyjets->P[2][iGlu+1] = pz2; | |
1162 | fPyjets->P[3][iGlu+1] = pst; | |
1163 | fPyjets->P[4][iGlu+1] = 0.; | |
1164 | ||
4e383037 | 1165 | fPyjets->K[0][iGlu+1] = 1; |
1166 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; | |
0f482ae4 | 1167 | fPyjets->K[1][iGlu+1] = 21; |
4e383037 | 1168 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1169 | fPyjets->K[3][iGlu+1] = -1; |
1170 | fPyjets->K[4][iGlu+1] = -1; | |
1171 | SetMSTU(1,0); | |
1172 | SetMSTU(2,0); | |
1173 | // | |
1174 | // Boost back | |
1175 | // | |
1176 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); | |
1177 | } | |
4e383037 | 1178 | /* |
1179 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { | |
1180 | Double_t px, py, pz; | |
1181 | px = fPyjets->P[0][ig]; | |
1182 | py = fPyjets->P[1][ig]; | |
1183 | pz = fPyjets->P[2][ig]; | |
1184 | TVector3 v(px, py, pz); | |
1185 | v.RotateZ(-phiq[isys]); | |
1186 | v.RotateY(-thetaq[isys]); | |
1187 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); | |
1188 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1189 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); | |
1190 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); | |
1191 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1192 | pxs += jtKick * TMath::Cos(phiKick); | |
1193 | pys += jtKick * TMath::Sin(phiKick); | |
1194 | TVector3 w(pxs, pys, pzs); | |
1195 | w.RotateY(thetaq[isys]); | |
1196 | w.RotateZ(phiq[isys]); | |
1197 | fPyjets->P[0][ig] = w.X(); | |
1198 | fPyjets->P[1][ig] = w.Y(); | |
1199 | fPyjets->P[2][ig] = w.Z(); | |
1200 | fPyjets->P[2][ig] = w.Mag(); | |
1201 | } | |
1202 | */ | |
1203 | } // kGluon | |
1204 | ||
6e90ad26 | 1205 | |
4e383037 | 1206 | // Check energy conservation |
0f482ae4 | 1207 | Double_t pxs = 0.; |
1208 | Double_t pys = 0.; | |
1209 | Double_t pzs = 0.; | |
1210 | Double_t es = 14000.; | |
1211 | ||
1212 | for (Int_t i = 0; i < numpart; i++) | |
1213 | { | |
1214 | kst = fPyjets->K[0][i]; | |
1215 | if (kst != 1 && kst != 2) continue; | |
1216 | pxs += fPyjets->P[0][i]; | |
1217 | pys += fPyjets->P[1][i]; | |
1218 | pzs += fPyjets->P[2][i]; | |
1219 | es -= fPyjets->P[3][i]; | |
1220 | } | |
1221 | if (TMath::Abs(pxs) > 1.e-2 || | |
1222 | TMath::Abs(pys) > 1.e-2 || | |
1223 | TMath::Abs(pzs) > 1.e-1) { | |
1224 | printf("%e %e %e %e\n", pxs, pys, pzs, es); | |
4e383037 | 1225 | // Fatal("Quench()", "4-Momentum non-conservation"); |
452af8c7 | 1226 | } |
4e383037 | 1227 | |
1228 | } // end quenching loop (systems) | |
6e90ad26 | 1229 | // Clean-up |
0f482ae4 | 1230 | for (Int_t i = 0; i < numpart; i++) |
1231 | { | |
4e383037 | 1232 | imo = fPyjets->K[2][i]; |
1233 | if (imo > 1000) { | |
1234 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; | |
1235 | } | |
0f482ae4 | 1236 | } |
4e383037 | 1237 | // this->Pylist(1); |
0f482ae4 | 1238 | } // end quench |
90d7b703 | 1239 | |
992f2843 | 1240 | |
1241 | void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b) | |
1242 | { | |
1243 | // Igor Lokthine's quenching routine | |
12cb0bc0 | 1244 | // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt |
1245 | ||
992f2843 | 1246 | pyquen(a, ibf, b); |
1247 | } | |
b280c4cc | 1248 | |
12cb0bc0 | 1249 | void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl) |
1250 | { | |
1251 | // Set the parameters for the PYQUEN package. | |
1252 | // See comments in PyquenCommon.h | |
1253 | ||
1254 | ||
1255 | PYQPAR.t0 = t0; | |
1256 | PYQPAR.tau0 = tau0; | |
1257 | PYQPAR.nf = nf; | |
1258 | PYQPAR.iengl = iengl; | |
1259 | PYQPAR.iangl = iangl; | |
1260 | } | |
1261 | ||
1262 | ||
16a82508 | 1263 | void AliPythia::Pyevnw() |
1264 | { | |
1265 | // New multiple interaction scenario | |
1266 | pyevnw(); | |
1267 | } | |
1268 | ||
cd07c39b | 1269 | void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax) |
1270 | { | |
1271 | // Call medium-modified Pythia jet reconstruction algorithm | |
1272 | // | |
1273 | pyshowq(ip1, ip2, qmax); | |
1274 | } | |
1275 | ||
b280c4cc | 1276 | void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) |
1277 | { | |
1278 | // Return event specific quenching parameters | |
1279 | xp = fXJet; | |
1280 | yp = fYJet; | |
1281 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; | |
1282 | ||
1283 | } | |
1284 | ||
3dc3ec94 | 1285 | void AliPythia::ConfigHeavyFlavor() |
1286 | { | |
1287 | // | |
1288 | // Default configuration for Heavy Flavor production | |
1289 | // | |
1290 | // All QCD processes | |
1291 | // | |
1292 | SetMSEL(1); | |
1293 | ||
1294 | // No multiple interactions | |
1295 | SetMSTP(81,0); | |
39c2e610 | 1296 | SetPARP(81, 0.); |
1297 | SetPARP(82, 0.); | |
3dc3ec94 | 1298 | // Initial/final parton shower on (Pythia default) |
1299 | SetMSTP(61,1); | |
1300 | SetMSTP(71,1); | |
1301 | ||
1302 | // 2nd order alpha_s | |
1303 | SetMSTP(2,2); | |
1304 | ||
1305 | // QCD scales | |
1306 | SetMSTP(32,2); | |
1307 | SetPARP(34,1.0); | |
1308 | } | |
e0e89f40 | 1309 | |
1310 | void AliPythia::AtlasTuning() | |
1311 | { | |
1312 | // | |
1313 | // Configuration for the ATLAS tuning | |
e2de0ce1 | 1314 | SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf |
e0e89f40 | 1315 | SetMSTP(81,1); // Multiple Interactions ON |
1316 | SetMSTP(82,4); // Double Gaussian Model | |
39c2e610 | 1317 | SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14) |
e0e89f40 | 1318 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy |
1319 | SetPARP(89,1000.); // [GeV] Ref. energy | |
1320 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
1321 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
1322 | SetPARP(84,0.5); // Core radius | |
1323 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
1324 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
1325 | SetPARP(67,1); // Regulates Initial State Radiation | |
1326 | } | |
e8a8adcd | 1327 | |
1328 | AliPythia& AliPythia::operator=(const AliPythia& rhs) | |
1329 | { | |
1330 | // Assignment operator | |
1331 | rhs.Copy(*this); | |
1332 | return *this; | |
1333 | } | |
1334 | ||
1335 | void AliPythia::Copy(TObject&) const | |
1336 | { | |
1337 | // | |
1338 | // Copy | |
1339 | // | |
1340 | Fatal("Copy","Not implemented!\n"); | |
1341 | } | |
cd07c39b | 1342 |