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8d2cd130 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
7cdba479 | 16 | /* $Id$ */ |
8d2cd130 | 17 | |
18 | #include "AliPythia.h" | |
7cdba479 | 19 | #include "AliPythiaRndm.h" |
12cb0bc0 | 20 | #include "AliFastGlauber.h" |
21 | #include "AliQuenchingWeights.h" | |
03358a32 | 22 | #include "AliOmegaDalitz.h" |
0f482ae4 | 23 | #include "TVector3.h" |
03358a32 | 24 | #include "TLorentzVector.h" |
12cb0bc0 | 25 | #include "PyquenCommon.h" |
8d2cd130 | 26 | |
27 | ClassImp(AliPythia) | |
28 | ||
29 | #ifndef WIN32 | |
30 | # define pyclus pyclus_ | |
31 | # define pycell pycell_ | |
452af8c7 | 32 | # define pyshow pyshow_ |
33 | # define pyrobo pyrobo_ | |
992f2843 | 34 | # define pyquen pyquen_ |
16a82508 | 35 | # define pyevnw pyevnw_ |
cd07c39b | 36 | # define pyshowq pyshowq_ |
6c43eccb | 37 | # define qpygin0 qpygin0_ |
694b39f9 | 38 | # define pytune pytune_ |
9b61ba2a | 39 | # define py2ent py2ent_ |
8d2cd130 | 40 | # define type_of_call |
41 | #else | |
42 | # define pyclus PYCLUS | |
43 | # define pycell PYCELL | |
452af8c7 | 44 | # define pyrobo PYROBO |
992f2843 | 45 | # define pyquen PYQUEN |
16a82508 | 46 | # define pyevnw PYEVNW |
cd07c39b | 47 | # define pyshowq PYSHOWQ |
6c43eccb | 48 | # define qpygin0 QPYGIN0 |
9b61ba2a | 49 | # define pytune PYTUNE |
50 | # define py2ent PY2ENT | |
8d2cd130 | 51 | # define type_of_call _stdcall |
52 | #endif | |
53 | ||
54 | extern "C" void type_of_call pyclus(Int_t & ); | |
55 | extern "C" void type_of_call pycell(Int_t & ); | |
452af8c7 | 56 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); |
57 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); | |
992f2843 | 58 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); |
0a2cfc0a | 59 | extern "C" void type_of_call pyevnw(){;} |
cd07c39b | 60 | extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &); |
694b39f9 | 61 | extern "C" void type_of_call pytune(Int_t &); |
9b61ba2a | 62 | extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&); |
6c43eccb | 63 | extern "C" void type_of_call qpygin0(); |
8d2cd130 | 64 | //_____________________________________________________________________________ |
65 | ||
66 | AliPythia* AliPythia::fgAliPythia=NULL; | |
67 | ||
e8a8adcd | 68 | AliPythia::AliPythia(): |
69 | fProcess(kPyMb), | |
70 | fEcms(0.), | |
71 | fStrucFunc(kCTEQ5L), | |
72 | fXJet(0.), | |
73 | fYJet(0.), | |
32c8e463 | 74 | fNGmax(30), |
75 | fZmax(0.97), | |
e8a8adcd | 76 | fGlauber(0), |
0bd3d7c5 | 77 | fQuenchingWeights(0), |
03358a32 | 78 | fItune(-1), |
79 | fOmegaDalitz() | |
8d2cd130 | 80 | { |
81 | // Default Constructor | |
82 | // | |
83 | // Set random number | |
7cdba479 | 84 | if (!AliPythiaRndm::GetPythiaRandom()) |
85 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
0f482ae4 | 86 | fGlauber = 0; |
87 | fQuenchingWeights = 0; | |
a23e397a | 88 | Int_t i = 0; |
89 | for (i = 0; i < 501; i++) fDefMDCY[i] = 0; | |
90 | for (i = 0; i < 2001; i++) fDefMDME[i] = 0; | |
91 | for (i = 0; i < 4; i++) fZQuench[i] = 0; | |
8d2cd130 | 92 | } |
93 | ||
e8a8adcd | 94 | AliPythia::AliPythia(const AliPythia& pythia): |
6b435cde | 95 | TPythia6(pythia), |
96 | AliRndm(pythia), | |
e8a8adcd | 97 | fProcess(kPyMb), |
98 | fEcms(0.), | |
99 | fStrucFunc(kCTEQ5L), | |
100 | fXJet(0.), | |
101 | fYJet(0.), | |
32c8e463 | 102 | fNGmax(30), |
103 | fZmax(0.97), | |
e8a8adcd | 104 | fGlauber(0), |
0bd3d7c5 | 105 | fQuenchingWeights(0), |
03358a32 | 106 | fItune(-1), |
107 | fOmegaDalitz() | |
e8a8adcd | 108 | { |
109 | // Copy Constructor | |
a23e397a | 110 | Int_t i; |
111 | for (i = 0; i < 501; i++) fDefMDCY[i] = 0; | |
112 | for (i = 0; i < 2001; i++) fDefMDME[i] = 0; | |
113 | for (i = 0; i < 4; i++) fZQuench[i] = 0; | |
e8a8adcd | 114 | pythia.Copy(*this); |
115 | } | |
116 | ||
efe3b1cd | 117 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune) |
8d2cd130 | 118 | { |
119 | // Initialise the process to generate | |
7cdba479 | 120 | if (!AliPythiaRndm::GetPythiaRandom()) |
121 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
8d2cd130 | 122 | |
0bd3d7c5 | 123 | fItune = itune; |
124 | ||
8d2cd130 | 125 | fProcess = process; |
126 | fEcms = energy; | |
127 | fStrucFunc = strucfunc; | |
1d5b1b20 | 128 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. |
e2de0ce1 | 129 | SetMDCY(Pycomp(111) ,1,0); // pi0 |
130 | SetMDCY(Pycomp(310) ,1,0); // K0S | |
131 | SetMDCY(Pycomp(3122),1,0); // kLambda | |
132 | SetMDCY(Pycomp(3112),1,0); // sigma - | |
e2de0ce1 | 133 | SetMDCY(Pycomp(3222),1,0); // sigma + |
134 | SetMDCY(Pycomp(3312),1,0); // xi - | |
135 | SetMDCY(Pycomp(3322),1,0); // xi 0 | |
136 | SetMDCY(Pycomp(3334),1,0); // omega- | |
1c50ec12 | 137 | // Select structure function |
8d2cd130 | 138 | SetMSTP(52,2); |
e2de0ce1 | 139 | SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc)); |
1c50ec12 | 140 | // Particles produced in string fragmentation point directly to either of the two endpoints |
141 | // of the string (depending in the side they were generated from). | |
142 | SetMSTU(16,2); | |
143 | ||
8d2cd130 | 144 | // |
145 | // Pythia initialisation for selected processes// | |
146 | // | |
147 | // Make MSEL clean | |
148 | // | |
149 | for (Int_t i=1; i<= 200; i++) { | |
150 | SetMSUB(i,0); | |
151 | } | |
152 | // select charm production | |
153 | switch (process) | |
154 | { | |
65f2626c | 155 | case kPyOldUEQ2ordered: //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(90,0.25); | |
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 kPyOldUEQ2ordered2: | |
177 | // Old underlying events with Q2 ordered QCD processes | |
178 | // Multiple interactions on. | |
179 | SetMSTP(81,1); | |
180 | // Double Gaussian matter distribution. | |
181 | SetMSTP(82,4); | |
182 | SetPARP(83,0.5); | |
183 | SetPARP(84,0.4); | |
184 | // pT0. | |
185 | SetPARP(82,2.0); | |
186 | // Reference energy for pT0 and energy rescaling pace. | |
187 | SetPARP(89,1800); | |
188 | SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered | |
189 | // String drawing almost completely minimizes string length. | |
190 | SetPARP(85,0.9); | |
191 | SetPARP(86,0.95); | |
192 | // ISR and FSR activity. | |
193 | SetPARP(67,4); | |
194 | SetPARP(71,4); | |
195 | // Lambda_FSR scale. | |
196 | SetPARJ(81,0.29); | |
197 | break; | |
198 | case kPyOldPopcorn: | |
199 | // Old production mechanism: Old Popcorn | |
200 | SetMSEL(1); | |
201 | SetMSTJ(12,3); | |
202 | // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon | |
203 | SetMSTP(88,2); | |
204 | // (D=1)see can be used to form baryons (BARYON JUNCTION) | |
205 | SetMSTJ(1,1); | |
e0e89f40 | 206 | AtlasTuning(); |
65f2626c | 207 | break; |
8d2cd130 | 208 | case kPyCharm: |
209 | SetMSEL(4); | |
8d2cd130 | 210 | // heavy quark masses |
211 | ||
212 | SetPMAS(4,1,1.2); | |
8d2cd130 | 213 | // |
214 | // primordial pT | |
215 | SetMSTP(91,1); | |
216 | SetPARP(91,1.); | |
217 | SetPARP(93,5.); | |
218 | // | |
219 | break; | |
220 | case kPyBeauty: | |
221 | SetMSEL(5); | |
222 | SetPMAS(5,1,4.75); | |
8d2cd130 | 223 | break; |
224 | case kPyJpsi: | |
225 | SetMSEL(0); | |
226 | // gg->J/Psi g | |
227 | SetMSUB(86,1); | |
228 | break; | |
229 | case kPyJpsiChi: | |
230 | SetMSEL(0); | |
231 | // gg->J/Psi g | |
232 | SetMSUB(86,1); | |
233 | // gg-> chi_0c g | |
234 | SetMSUB(87,1); | |
235 | // gg-> chi_1c g | |
236 | SetMSUB(88,1); | |
237 | // gg-> chi_2c g | |
238 | SetMSUB(89,1); | |
239 | break; | |
240 | case kPyCharmUnforced: | |
241 | SetMSEL(0); | |
242 | // gq->qg | |
243 | SetMSUB(28,1); | |
244 | // gg->qq | |
245 | SetMSUB(53,1); | |
246 | // gg->gg | |
247 | SetMSUB(68,1); | |
248 | break; | |
249 | case kPyBeautyUnforced: | |
250 | SetMSEL(0); | |
251 | // gq->qg | |
252 | SetMSUB(28,1); | |
253 | // gg->qq | |
254 | SetMSUB(53,1); | |
255 | // gg->gg | |
256 | SetMSUB(68,1); | |
257 | break; | |
258 | case kPyMb: | |
259 | // Minimum Bias pp-Collisions | |
260 | // | |
261 | // | |
262 | // select Pythia min. bias model | |
263 | SetMSEL(0); | |
511db649 | 264 | SetMSUB(92,1); // single diffraction AB-->XB |
265 | SetMSUB(93,1); // single diffraction AB-->AX | |
266 | SetMSUB(94,1); // double diffraction | |
267 | SetMSUB(95,1); // low pt production | |
268 | ||
e0e89f40 | 269 | AtlasTuning(); |
f529e69b | 270 | break; |
0bd3d7c5 | 271 | |
272 | case kPyMbAtlasTuneMC09: | |
273 | // Minimum Bias pp-Collisions | |
274 | // | |
275 | // | |
276 | // select Pythia min. bias model | |
277 | SetMSEL(0); | |
278 | SetMSUB(92,1); // single diffraction AB-->XB | |
279 | SetMSUB(93,1); // single diffraction AB-->AX | |
280 | SetMSUB(94,1); // double diffraction | |
281 | SetMSUB(95,1); // low pt production | |
282 | ||
283 | AtlasTuning_MC09(); | |
284 | break; | |
04081a91 | 285 | |
286 | case kPyMbWithDirectPhoton: | |
287 | // Minimum Bias pp-Collisions with direct photon processes added | |
288 | // | |
289 | // | |
290 | // select Pythia min. bias model | |
291 | SetMSEL(0); | |
292 | SetMSUB(92,1); // single diffraction AB-->XB | |
293 | SetMSUB(93,1); // single diffraction AB-->AX | |
294 | SetMSUB(94,1); // double diffraction | |
295 | SetMSUB(95,1); // low pt production | |
296 | ||
297 | SetMSUB(14,1); // | |
298 | SetMSUB(18,1); // | |
299 | SetMSUB(29,1); // | |
300 | SetMSUB(114,1); // | |
301 | SetMSUB(115,1); // | |
302 | ||
303 | ||
304 | AtlasTuning(); | |
305 | break; | |
306 | ||
f529e69b | 307 | case kPyMbDefault: |
308 | // Minimum Bias pp-Collisions | |
309 | // | |
310 | // | |
311 | // select Pythia min. bias model | |
312 | SetMSEL(0); | |
6d2ec66d | 313 | SetMSUB(92,1); // single diffraction AB-->XB |
314 | SetMSUB(93,1); // single diffraction AB-->AX | |
f529e69b | 315 | SetMSUB(94,1); // double diffraction |
316 | SetMSUB(95,1); // low pt production | |
0a0cbcfd | 317 | break; |
318 | case kPyLhwgMb: | |
319 | // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120 | |
320 | // -> Pythia 6.3 or above is needed | |
321 | // | |
322 | SetMSEL(0); | |
323 | SetMSUB(92,1); // single diffraction AB-->XB | |
324 | SetMSUB(93,1); // single diffraction AB-->AX | |
325 | SetMSUB(94,1); // double diffraction | |
326 | SetMSUB(95,1); // low pt production | |
327 | ||
e2de0ce1 | 328 | SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf |
0a0cbcfd | 329 | SetMSTP(52,2); |
330 | SetMSTP(68,1); | |
331 | SetMSTP(70,2); | |
332 | SetMSTP(81,1); // Multiple Interactions ON | |
333 | SetMSTP(82,4); // Double Gaussian Model | |
334 | SetMSTP(88,1); | |
335 | ||
336 | SetPARP(82,2.3); // [GeV] PT_min at Ref. energy | |
337 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
338 | SetPARP(84,0.5); // Core radius | |
339 | SetPARP(85,0.9); // Regulates gluon prod. mechanism | |
340 | SetPARP(90,0.2); // 2*epsilon (exponent in power law) | |
341 | ||
511db649 | 342 | break; |
8d2cd130 | 343 | case kPyMbNonDiffr: |
344 | // Minimum Bias pp-Collisions | |
345 | // | |
346 | // | |
347 | // select Pythia min. bias model | |
348 | SetMSEL(0); | |
511db649 | 349 | SetMSUB(95,1); // low pt production |
0f482ae4 | 350 | |
d7de4a67 | 351 | AtlasTuning(); |
352 | break; | |
353 | case kPyMbMSEL1: | |
354 | ConfigHeavyFlavor(); | |
355 | // Intrinsic <kT^2> | |
356 | SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons | |
357 | SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2 | |
358 | SetPARP(93,5.); // Upper cut-off | |
359 | // Set Q-quark mass | |
360 | SetPMAS(4,1,1.2); // Charm quark mass | |
361 | SetPMAS(5,1,4.78); // Beauty quark mass | |
362 | SetPARP(71,4.); // Defaut value | |
363 | // Atlas Tuning | |
e0e89f40 | 364 | AtlasTuning(); |
8d2cd130 | 365 | break; |
366 | case kPyJets: | |
367 | // | |
368 | // QCD Jets | |
369 | // | |
370 | SetMSEL(1); | |
65f2626c | 371 | // Pythia Tune A (CDF) |
372 | // | |
4167b79f | 373 | SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis) |
65f2626c | 374 | SetMSTP(82,4); // Double Gaussian Model |
375 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy | |
376 | SetPARP(84,0.4); // Core radius | |
377 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism | |
378 | SetPARP(86,0.95); // Regulates gluon prod. mechanism | |
379 | SetPARP(89,1800.); // [GeV] Ref. energy | |
0bd3d7c5 | 380 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) |
65f2626c | 381 | break; |
8d2cd130 | 382 | case kPyDirectGamma: |
383 | SetMSEL(10); | |
384 | break; | |
adf4d898 | 385 | case kPyCharmPbPbMNR: |
386 | case kPyD0PbPbMNR: | |
90d7b703 | 387 | case kPyDPlusPbPbMNR: |
e0e89f40 | 388 | case kPyDPlusStrangePbPbMNR: |
90d7b703 | 389 | // Tuning of Pythia parameters aimed to get a resonable agreement |
390 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
391 | // c-cbar single inclusive and double differential distributions. | |
392 | // This parameter settings are meant to work with Pb-Pb collisions | |
393 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
394 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
395 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 396 | ConfigHeavyFlavor(); |
90d7b703 | 397 | // Intrinsic <kT> |
398 | SetMSTP(91,1); | |
399 | SetPARP(91,1.304); | |
400 | SetPARP(93,6.52); | |
90d7b703 | 401 | // Set c-quark mass |
402 | SetPMAS(4,1,1.2); | |
8d2cd130 | 403 | break; |
adf4d898 | 404 | case kPyCharmpPbMNR: |
405 | case kPyD0pPbMNR: | |
90d7b703 | 406 | case kPyDPluspPbMNR: |
e0e89f40 | 407 | case kPyDPlusStrangepPbMNR: |
90d7b703 | 408 | // Tuning of Pythia parameters aimed to get a resonable agreement |
409 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
410 | // c-cbar single inclusive and double differential distributions. | |
411 | // This parameter settings are meant to work with p-Pb collisions | |
412 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
413 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
414 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 415 | ConfigHeavyFlavor(); |
90d7b703 | 416 | // Intrinsic <kT> |
3dc3ec94 | 417 | SetMSTP(91,1); |
418 | SetPARP(91,1.16); | |
419 | SetPARP(93,5.8); | |
420 | ||
90d7b703 | 421 | // Set c-quark mass |
3dc3ec94 | 422 | SetPMAS(4,1,1.2); |
adf4d898 | 423 | break; |
424 | case kPyCharmppMNR: | |
425 | case kPyD0ppMNR: | |
90d7b703 | 426 | case kPyDPlusppMNR: |
e0e89f40 | 427 | case kPyDPlusStrangeppMNR: |
68504d42 | 428 | case kPyLambdacppMNR: |
90d7b703 | 429 | // Tuning of Pythia parameters aimed to get a resonable agreement |
430 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
431 | // c-cbar single inclusive and double differential distributions. | |
432 | // This parameter settings are meant to work with pp collisions | |
433 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
434 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
435 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
3dc3ec94 | 436 | ConfigHeavyFlavor(); |
90d7b703 | 437 | // Intrinsic <kT^2> |
3dc3ec94 | 438 | SetMSTP(91,1); |
439 | SetPARP(91,1.); | |
440 | SetPARP(93,5.); | |
441 | ||
90d7b703 | 442 | // Set c-quark mass |
3dc3ec94 | 443 | SetPMAS(4,1,1.2); |
adf4d898 | 444 | break; |
e0e89f40 | 445 | case kPyCharmppMNRwmi: |
446 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
447 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
448 | // c-cbar single inclusive and double differential distributions. | |
449 | // This parameter settings are meant to work with pp collisions | |
450 | // and with kCTEQ5L PDFs. | |
451 | // Added multiple interactions according to ATLAS tune settings. | |
452 | // To get a "reasonable" agreement with MNR results, events have to be | |
453 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
454 | // set to 2.76 GeV. | |
455 | // To get a "perfect" agreement with MNR results, events have to be | |
456 | // generated in four ptHard bins with the following relative | |
457 | // normalizations: | |
458 | // 2.76-3 GeV: 25% | |
459 | // 3-4 GeV: 40% | |
460 | // 4-8 GeV: 29% | |
461 | // >8 GeV: 6% | |
462 | ConfigHeavyFlavor(); | |
463 | // Intrinsic <kT^2> | |
464 | SetMSTP(91,1); | |
465 | SetPARP(91,1.); | |
466 | SetPARP(93,5.); | |
467 | ||
468 | // Set c-quark mass | |
469 | SetPMAS(4,1,1.2); | |
470 | AtlasTuning(); | |
471 | break; | |
adf4d898 | 472 | case kPyBeautyPbPbMNR: |
8d2cd130 | 473 | // Tuning of Pythia parameters aimed to get a resonable agreement |
474 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
475 | // b-bbar single inclusive and double differential distributions. | |
476 | // This parameter settings are meant to work with Pb-Pb collisions | |
477 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
478 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
479 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 480 | ConfigHeavyFlavor(); |
8d2cd130 | 481 | // QCD scales |
3dc3ec94 | 482 | SetPARP(67,1.0); |
483 | SetPARP(71,1.0); | |
adf4d898 | 484 | // Intrinsic <kT> |
3dc3ec94 | 485 | SetMSTP(91,1); |
486 | SetPARP(91,2.035); | |
487 | SetPARP(93,10.17); | |
8d2cd130 | 488 | // Set b-quark mass |
3dc3ec94 | 489 | SetPMAS(5,1,4.75); |
adf4d898 | 490 | break; |
491 | case kPyBeautypPbMNR: | |
492 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
493 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
494 | // b-bbar single inclusive and double differential distributions. | |
495 | // This parameter settings are meant to work with p-Pb collisions | |
496 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
497 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
498 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 499 | ConfigHeavyFlavor(); |
adf4d898 | 500 | // QCD scales |
3dc3ec94 | 501 | SetPARP(67,1.0); |
502 | SetPARP(71,1.0); | |
adf4d898 | 503 | // Intrinsic <kT> |
3dc3ec94 | 504 | SetMSTP(91,1); |
505 | SetPARP(91,1.60); | |
506 | SetPARP(93,8.00); | |
adf4d898 | 507 | // Set b-quark mass |
3dc3ec94 | 508 | SetPMAS(5,1,4.75); |
adf4d898 | 509 | break; |
510 | case kPyBeautyppMNR: | |
511 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
512 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
513 | // b-bbar single inclusive and double differential distributions. | |
514 | // This parameter settings are meant to work with pp collisions | |
515 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
516 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
517 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
3dc3ec94 | 518 | ConfigHeavyFlavor(); |
adf4d898 | 519 | // QCD scales |
3dc3ec94 | 520 | SetPARP(67,1.0); |
521 | SetPARP(71,1.0); | |
522 | ||
523 | // Intrinsic <kT> | |
524 | SetMSTP(91,1); | |
525 | SetPARP(91,1.); | |
526 | SetPARP(93,5.); | |
527 | ||
528 | // Set b-quark mass | |
529 | SetPMAS(5,1,4.75); | |
8d2cd130 | 530 | break; |
9dfe63b3 | 531 | case kPyBeautyJets: |
e0e89f40 | 532 | case kPyBeautyppMNRwmi: |
533 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
534 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
535 | // b-bbar single inclusive and double differential distributions. | |
536 | // This parameter settings are meant to work with pp collisions | |
537 | // and with kCTEQ5L PDFs. | |
538 | // Added multiple interactions according to ATLAS tune settings. | |
539 | // To get a "reasonable" agreement with MNR results, events have to be | |
540 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
541 | // set to 2.76 GeV. | |
542 | // To get a "perfect" agreement with MNR results, events have to be | |
543 | // generated in four ptHard bins with the following relative | |
544 | // normalizations: | |
545 | // 2.76-4 GeV: 5% | |
546 | // 4-6 GeV: 31% | |
547 | // 6-8 GeV: 28% | |
548 | // >8 GeV: 36% | |
549 | ConfigHeavyFlavor(); | |
550 | // QCD scales | |
551 | SetPARP(67,1.0); | |
552 | SetPARP(71,1.0); | |
553 | ||
554 | // Intrinsic <kT> | |
555 | SetMSTP(91,1); | |
556 | SetPARP(91,1.); | |
557 | SetPARP(93,5.); | |
558 | ||
559 | // Set b-quark mass | |
560 | SetPMAS(5,1,4.75); | |
561 | ||
562 | AtlasTuning(); | |
563 | break; | |
589380c6 | 564 | case kPyW: |
565 | ||
566 | //Inclusive production of W+/- | |
567 | SetMSEL(0); | |
568 | //f fbar -> W+ | |
569 | SetMSUB(2,1); | |
570 | // //f fbar -> g W+ | |
571 | // SetMSUB(16,1); | |
572 | // //f fbar -> gamma W+ | |
573 | // SetMSUB(20,1); | |
574 | // //f g -> f W+ | |
575 | // SetMSUB(31,1); | |
576 | // //f gamma -> f W+ | |
577 | // SetMSUB(36,1); | |
578 | ||
579 | // Initial/final parton shower on (Pythia default) | |
580 | // With parton showers on we are generating "W inclusive process" | |
581 | SetMSTP(61,1); //Initial QCD & QED showers on | |
582 | SetMSTP(71,1); //Final QCD & QED showers on | |
583 | ||
584 | break; | |
0f6ee828 | 585 | |
586 | case kPyZ: | |
587 | ||
588 | //Inclusive production of Z | |
589 | SetMSEL(0); | |
590 | //f fbar -> Z/gamma | |
591 | SetMSUB(1,1); | |
592 | ||
593 | // // f fbar -> g Z/gamma | |
594 | // SetMSUB(15,1); | |
595 | // // f fbar -> gamma Z/gamma | |
596 | // SetMSUB(19,1); | |
597 | // // f g -> f Z/gamma | |
598 | // SetMSUB(30,1); | |
599 | // // f gamma -> f Z/gamma | |
600 | // SetMSUB(35,1); | |
601 | ||
602 | //only Z included, not gamma | |
603 | SetMSTP(43,2); | |
604 | ||
605 | // Initial/final parton shower on (Pythia default) | |
606 | // With parton showers on we are generating "Z inclusive process" | |
607 | SetMSTP(61,1); //Initial QCD & QED showers on | |
608 | SetMSTP(71,1); //Final QCD & QED showers on | |
609 | ||
610 | break; | |
611 | ||
8d2cd130 | 612 | } |
613 | // | |
614 | // Initialize PYTHIA | |
efe3b1cd | 615 | // |
616 | // Select the tune | |
617 | if (itune > -1) Pytune(itune); | |
618 | ||
619 | // | |
8d2cd130 | 620 | SetMSTP(41,1); // all resonance decays switched on |
d95b55fa | 621 | Initialize("CMS","p","p",fEcms); |
03358a32 | 622 | fOmegaDalitz.Init(); |
8d2cd130 | 623 | } |
624 | ||
625 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
626 | { | |
627 | // Check Lund particle code (for debugging) | |
628 | Int_t kc=Pycomp(kf); | |
629 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
630 | return kc; | |
631 | } | |
632 | ||
20e47f08 | 633 | void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf) |
8d2cd130 | 634 | { |
635 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
636 | // The MSTP array in the PYPARS common block is used to enable and | |
637 | // select the nuclear structure functions. | |
638 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
639 | // =1: internal PYTHIA acording to MSTP(51) | |
640 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
641 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
642 | // MSTP(192) : Mass number of nucleus side 1 | |
643 | // MSTP(193) : Mass number of nucleus side 2 | |
20e47f08 | 644 | // MSTP(194) : Nuclear structure function: 0: EKS98 1:EPS08 |
8d2cd130 | 645 | SetMSTP(52,2); |
646 | SetMSTP(192, a1); | |
20e47f08 | 647 | SetMSTP(193, a2); |
648 | SetMSTP(194, pdf); | |
8d2cd130 | 649 | } |
650 | ||
651 | ||
652 | AliPythia* AliPythia::Instance() | |
653 | { | |
654 | // Set random number generator | |
655 | if (fgAliPythia) { | |
656 | return fgAliPythia; | |
657 | } else { | |
658 | fgAliPythia = new AliPythia(); | |
659 | return fgAliPythia; | |
660 | } | |
661 | } | |
662 | ||
663 | void AliPythia::PrintParticles() | |
664 | { | |
665 | // Print list of particl properties | |
666 | Int_t np = 0; | |
c31f1d37 | 667 | char* name = new char[16]; |
8d2cd130 | 668 | for (Int_t kf=0; kf<1000000; kf++) { |
669 | for (Int_t c = 1; c > -2; c-=2) { | |
8d2cd130 | 670 | Int_t kc = Pycomp(c*kf); |
671 | if (kc) { | |
672 | Float_t mass = GetPMAS(kc,1); | |
673 | Float_t width = GetPMAS(kc,2); | |
674 | Float_t tau = GetPMAS(kc,4); | |
c31f1d37 | 675 | |
8d2cd130 | 676 | Pyname(kf,name); |
677 | ||
678 | np++; | |
679 | ||
680 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
681 | c*kf, name, mass, width, tau); | |
682 | } | |
683 | } | |
684 | } | |
685 | printf("\n Number of particles %d \n \n", np); | |
686 | } | |
687 | ||
688 | void AliPythia::ResetDecayTable() | |
689 | { | |
690 | // Set default values for pythia decay switches | |
691 | Int_t i; | |
692 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
693 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
694 | } | |
695 | ||
696 | void AliPythia::SetDecayTable() | |
697 | { | |
698 | // Set default values for pythia decay switches | |
699 | // | |
700 | Int_t i; | |
701 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
702 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
703 | } | |
704 | ||
705 | void AliPythia::Pyclus(Int_t& njet) | |
706 | { | |
707 | // Call Pythia clustering algorithm | |
708 | // | |
709 | pyclus(njet); | |
710 | } | |
711 | ||
712 | void AliPythia::Pycell(Int_t& njet) | |
713 | { | |
714 | // Call Pythia jet reconstruction algorithm | |
715 | // | |
716 | pycell(njet); | |
717 | } | |
718 | ||
452af8c7 | 719 | void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) |
720 | { | |
721 | // Call Pythia jet reconstruction algorithm | |
722 | // | |
452af8c7 | 723 | pyshow(ip1, ip2, qmax); |
724 | } | |
725 | ||
726 | void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) | |
727 | { | |
728 | pyrobo(imi, ima, the, phi, bex, bey, bez); | |
729 | } | |
730 | ||
694b39f9 | 731 | void AliPythia::Pytune(Int_t itune) |
732 | { | |
c5e2801a | 733 | /* |
734 | C | |
735 | C ITUNE NAME (detailed descriptions below) | |
736 | C 0 Default : No settings changed => linked Pythia version's defaults. | |
737 | C ====== Old UE, Q2-ordered showers ========================================== | |
738 | C 100 A : Rick Field's CDF Tune A | |
739 | C 101 AW : Rick Field's CDF Tune AW | |
740 | C 102 BW : Rick Field's CDF Tune BW | |
741 | C 103 DW : Rick Field's CDF Tune DW | |
742 | C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling | |
743 | C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally) | |
744 | C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome) | |
745 | C 107 ACR : Tune A modified with annealing CR | |
746 | C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally) | |
747 | C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally) | |
748 | C ====== Intermediate Models ================================================= | |
749 | C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR | |
750 | C 201 APT : Tune A modified to use pT-ordered final-state showers | |
751 | C ====== New UE, interleaved pT-ordered showers, annealing CR ================ | |
752 | C 300 S0 : Sandhoff-Skands Tune 0 | |
753 | C 301 S1 : Sandhoff-Skands Tune 1 | |
754 | C 302 S2 : Sandhoff-Skands Tune 2 | |
755 | C 303 S0A : S0 with "Tune A" UE energy scaling | |
756 | C 304 NOCR : New UE "best try" without colour reconnections | |
757 | C 305 Old : New UE, original (primitive) colour reconnections | |
758 | C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally) | |
759 | C ======= The Uppsala models ================================================= | |
760 | C ( NB! must be run with special modified Pythia 6.215 version ) | |
761 | C ( available from http://www.isv.uu.se/thep/MC/scigal/ ) | |
762 | C 400 GAL 0 : Generalized area-law model. Old parameters | |
763 | C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters | |
764 | C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands) | |
765 | */ | |
694b39f9 | 766 | pytune(itune); |
767 | } | |
768 | ||
9b61ba2a | 769 | void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){ |
770 | // Inset 2-parton system at line idx | |
771 | py2ent(idx, pdg1, pdg2, p); | |
772 | } | |
452af8c7 | 773 | |
774 | ||
32c8e463 | 775 | void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax) |
0f482ae4 | 776 | { |
777 | // Initializes | |
778 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann | |
779 | // (2) The nuclear geometry using the Glauber Model | |
780 | // | |
6b435cde | 781 | |
18b7a4a1 | 782 | fGlauber = AliFastGlauber::Instance(); |
0f482ae4 | 783 | fGlauber->Init(2); |
784 | fGlauber->SetCentralityClass(cMin, cMax); | |
785 | ||
786 | fQuenchingWeights = new AliQuenchingWeights(); | |
787 | fQuenchingWeights->InitMult(); | |
86b6ad68 | 788 | fQuenchingWeights->SetK(k); |
0f482ae4 | 789 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); |
32c8e463 | 790 | fNGmax = ngmax; |
791 | fZmax = zmax; | |
792 | ||
0f482ae4 | 793 | } |
794 | ||
795 | ||
452af8c7 | 796 | void AliPythia::Quench() |
797 | { | |
798 | // | |
799 | // | |
800 | // Simple Jet Quenching routine: | |
801 | // ============================= | |
802 | // The jet formed by all final state partons radiated by the parton created | |
0f482ae4 | 803 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in |
804 | // the initial parton reference frame: | |
452af8c7 | 805 | // (E + p_z)new = (1-z) (E + p_z)old |
806 | // | |
0f482ae4 | 807 | // |
808 | // | |
809 | // | |
452af8c7 | 810 | // The lost momentum is first balanced by one gluon with virtuality > 0. |
811 | // Subsequently the gluon splits to yield two gluons with E = p. | |
812 | // | |
0f482ae4 | 813 | // |
814 | // | |
4e383037 | 815 | static Float_t eMean = 0.; |
816 | static Int_t icall = 0; | |
0f482ae4 | 817 | |
c2c598a3 | 818 | Double_t p0[4][5]; |
819 | Double_t p1[4][5]; | |
820 | Double_t p2[4][5]; | |
821 | Int_t klast[4] = {-1, -1, -1, -1}; | |
452af8c7 | 822 | |
823 | Int_t numpart = fPyjets->N; | |
86b6ad68 | 824 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; |
c2c598a3 | 825 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; |
826 | Bool_t quenched[4]; | |
a23e397a | 827 | Double_t wjtKick[4] = {0., 0., 0., 0.}; |
c2c598a3 | 828 | Int_t nGluon[4]; |
86b6ad68 | 829 | Int_t qPdg[4]; |
0f482ae4 | 830 | Int_t imo, kst, pdg; |
b280c4cc | 831 | |
511db649 | 832 | // |
c2c598a3 | 833 | // Sore information about Primary partons |
834 | // | |
835 | // j = | |
836 | // 0, 1 partons from hard scattering | |
837 | // 2, 3 partons from initial state radiation | |
838 | // | |
839 | for (Int_t i = 2; i <= 7; i++) { | |
840 | Int_t j = 0; | |
841 | // Skip gluons that participate in hard scattering | |
842 | if (i == 4 || i == 5) continue; | |
843 | // Gluons from hard Scattering | |
844 | if (i == 6 || i == 7) { | |
845 | j = i - 6; | |
846 | pxq[j] = fPyjets->P[0][i]; | |
847 | pyq[j] = fPyjets->P[1][i]; | |
848 | pzq[j] = fPyjets->P[2][i]; | |
849 | eq[j] = fPyjets->P[3][i]; | |
850 | mq[j] = fPyjets->P[4][i]; | |
851 | } else { | |
852 | // Gluons from initial state radiation | |
853 | // | |
854 | // Obtain 4-momentum vector from difference between original parton and parton after gluon | |
855 | // radiation. Energy is calculated independently because initial state radition does not | |
856 | // conserve strictly momentum and energy for each partonic system independently. | |
857 | // | |
858 | // Not very clean. Should be improved ! | |
859 | // | |
860 | // | |
861 | j = i; | |
862 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; | |
863 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; | |
864 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; | |
865 | mq[j] = fPyjets->P[4][i]; | |
866 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); | |
867 | } | |
868 | // | |
869 | // Calculate some kinematic variables | |
511db649 | 870 | // |
4e383037 | 871 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); |
0f482ae4 | 872 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); |
873 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); | |
874 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); | |
875 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); | |
86b6ad68 | 876 | qPdg[j] = fPyjets->K[1][i]; |
877 | } | |
878 | ||
879 | Double_t int0[4]; | |
880 | Double_t int1[4]; | |
86b6ad68 | 881 | |
b280c4cc | 882 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); |
883 | ||
86b6ad68 | 884 | for (Int_t j = 0; j < 4; j++) { |
c2c598a3 | 885 | // |
886 | // Quench only central jets and with E > 10. | |
887 | // | |
86b6ad68 | 888 | |
889 | ||
890 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; | |
891 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); | |
892 | ||
c2c598a3 | 893 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { |
b280c4cc | 894 | fZQuench[j] = 0.; |
0f482ae4 | 895 | } else { |
c2c598a3 | 896 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { |
4e383037 | 897 | icall ++; |
898 | eMean += eloss; | |
899 | } | |
0f482ae4 | 900 | // |
901 | // Extra pt | |
86b6ad68 | 902 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); |
903 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); | |
0f482ae4 | 904 | // |
905 | // Fractional energy loss | |
b280c4cc | 906 | fZQuench[j] = eloss / eq[j]; |
0f482ae4 | 907 | // |
908 | // Avoid complete loss | |
909 | // | |
1044c4d8 | 910 | if (fZQuench[j] > fZmax) fZQuench[j] = fZmax; |
0f482ae4 | 911 | // |
912 | // Some debug printing | |
86b6ad68 | 913 | |
914 | ||
bf9bb016 | 915 | // 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", |
916 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); | |
4e383037 | 917 | |
b280c4cc | 918 | // fZQuench[j] = 0.8; |
919 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); | |
0f482ae4 | 920 | } |
4e383037 | 921 | |
b280c4cc | 922 | quenched[j] = (fZQuench[j] > 0.01); |
4e383037 | 923 | } // primary partons |
c2c598a3 | 924 | |
b280c4cc | 925 | |
926 | ||
6e90ad26 | 927 | Double_t pNew[1000][4]; |
928 | Int_t kNew[1000]; | |
929 | Int_t icount = 0; | |
b280c4cc | 930 | Double_t zquench[4]; |
931 | ||
6e90ad26 | 932 | // |
4e383037 | 933 | // System Loop |
c2c598a3 | 934 | for (Int_t isys = 0; isys < 4; isys++) { |
6e90ad26 | 935 | // Skip to next system if not quenched. |
4e383037 | 936 | if (!quenched[isys]) continue; |
937 | ||
b280c4cc | 938 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); |
32c8e463 | 939 | if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax; |
b280c4cc | 940 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); |
4e383037 | 941 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); |
0f482ae4 | 942 | |
4e383037 | 943 | |
944 | ||
945 | Int_t igMin = -1; | |
946 | Int_t igMax = -1; | |
947 | Double_t pg[4] = {0., 0., 0., 0.}; | |
948 | ||
949 | // | |
950 | // Loop on radiation events | |
951 | ||
952 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { | |
6e90ad26 | 953 | while (1) { |
954 | icount = 0; | |
955 | for (Int_t k = 0; k < 4; k++) | |
956 | { | |
957 | p0[isys][k] = 0.; | |
958 | p1[isys][k] = 0.; | |
959 | p2[isys][k] = 0.; | |
960 | } | |
961 | // Loop over partons | |
962 | for (Int_t i = 0; i < numpart; i++) | |
963 | { | |
964 | imo = fPyjets->K[2][i]; | |
965 | kst = fPyjets->K[0][i]; | |
966 | pdg = fPyjets->K[1][i]; | |
967 | ||
968 | ||
969 | ||
0f482ae4 | 970 | // Quarks and gluons only |
6e90ad26 | 971 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; |
0f482ae4 | 972 | // Particles from hard scattering only |
c2c598a3 | 973 | |
6e90ad26 | 974 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; |
c2c598a3 | 975 | Int_t imom = imo % 1000; |
976 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; | |
977 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; | |
978 | ||
6e90ad26 | 979 | |
0f482ae4 | 980 | // Skip comment lines |
6e90ad26 | 981 | if (kst != 1 && kst != 2) continue; |
0f482ae4 | 982 | // |
983 | // Parton kinematic | |
6e90ad26 | 984 | px = fPyjets->P[0][i]; |
985 | py = fPyjets->P[1][i]; | |
986 | pz = fPyjets->P[2][i]; | |
987 | e = fPyjets->P[3][i]; | |
988 | m = fPyjets->P[4][i]; | |
989 | pt = TMath::Sqrt(px * px + py * py); | |
990 | p = TMath::Sqrt(px * px + py * py + pz * pz); | |
991 | phi = TMath::Pi() + TMath::ATan2(-py, -px); | |
992 | theta = TMath::ATan2(pt, pz); | |
993 | ||
0f482ae4 | 994 | // |
c2c598a3 | 995 | // Save 4-momentum sum for balancing |
996 | Int_t index = isys; | |
6e90ad26 | 997 | |
998 | p0[index][0] += px; | |
999 | p0[index][1] += py; | |
1000 | p0[index][2] += pz; | |
1001 | p0[index][3] += e; | |
6e90ad26 | 1002 | |
1003 | klast[index] = i; | |
1004 | ||
0f482ae4 | 1005 | // |
1006 | // Fractional energy loss | |
b280c4cc | 1007 | Double_t z = zquench[index]; |
4e383037 | 1008 | |
c2c598a3 | 1009 | |
4e383037 | 1010 | // Don't fully quench radiated gluons |
1011 | // | |
1012 | if (imo > 1000) { | |
1013 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination | |
1014 | // | |
1015 | ||
c2c598a3 | 1016 | z = 0.02; |
4e383037 | 1017 | } |
c2c598a3 | 1018 | // printf("z: %d %f\n", imo, z); |
1019 | ||
4e383037 | 1020 | |
1021 | // | |
6e90ad26 | 1022 | |
1023 | // | |
1024 | // | |
1025 | // Transform into frame in which initial parton is along z-axis | |
1026 | // | |
1027 | TVector3 v(px, py, pz); | |
1028 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); | |
1029 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); | |
1030 | ||
1031 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); | |
1032 | Double_t mt2 = jt * jt + m * m; | |
1033 | Double_t zmax = 1.; | |
1034 | // | |
1035 | // Kinematic limit on z | |
1036 | // | |
4e383037 | 1037 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); |
6e90ad26 | 1038 | // |
1039 | // Change light-cone kinematics rel. to initial parton | |
1040 | // | |
1041 | Double_t eppzOld = e + pl; | |
1042 | Double_t empzOld = e - pl; | |
1043 | ||
1044 | Double_t eppzNew = (1. - z) * eppzOld; | |
1045 | Double_t empzNew = empzOld - mt2 * z / eppzOld; | |
1046 | Double_t eNew = 0.5 * (eppzNew + empzNew); | |
1047 | Double_t plNew = 0.5 * (eppzNew - empzNew); | |
1048 | ||
1049 | Double_t jtNew; | |
1050 | // | |
1051 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 | |
1052 | Double_t mt2New = eppzNew * empzNew; | |
1053 | if (mt2New < 1.e-8) mt2New = 0.; | |
4e383037 | 1054 | if (z < zmax) { |
1055 | if (m * m > mt2New) { | |
1056 | // | |
1057 | // This should not happen | |
1058 | // | |
1059 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); | |
1060 | jtNew = 0; | |
1061 | } else { | |
1062 | jtNew = TMath::Sqrt(mt2New - m * m); | |
1063 | } | |
6e90ad26 | 1064 | } else { |
4e383037 | 1065 | // If pT is to small (probably a leading massive particle) we scale only the energy |
1066 | // This can cause negative masses of the radiated gluon | |
1067 | // Let's hope for the best ... | |
1068 | jtNew = jt; | |
1069 | eNew = TMath::Sqrt(plNew * plNew + mt2); | |
1070 | ||
6e90ad26 | 1071 | } |
6e90ad26 | 1072 | // |
1073 | // Calculate new px, py | |
1074 | // | |
b07be423 | 1075 | Double_t pxNew = 0; |
1076 | Double_t pyNew = 0; | |
6e90ad26 | 1077 | |
b07be423 | 1078 | if (jt>0) { |
6b118b3c | 1079 | pxNew = jtNew / jt * pxs; |
1080 | pyNew = jtNew / jt * pys; | |
b07be423 | 1081 | } |
6e90ad26 | 1082 | // Double_t dpx = pxs - pxNew; |
1083 | // Double_t dpy = pys - pyNew; | |
1084 | // Double_t dpz = pl - plNew; | |
1085 | // Double_t de = e - eNew; | |
1086 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; | |
1087 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); | |
1088 | // printf("New mass (2) %e %e \n", pxNew, pyNew); | |
1089 | // | |
1090 | // Rotate back | |
1091 | // | |
1092 | TVector3 w(pxNew, pyNew, plNew); | |
1093 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); | |
1094 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); | |
1095 | ||
1096 | p1[index][0] += pxNew; | |
1097 | p1[index][1] += pyNew; | |
1098 | p1[index][2] += plNew; | |
1099 | p1[index][3] += eNew; | |
1100 | // | |
1101 | // Updated 4-momentum vectors | |
1102 | // | |
1103 | pNew[icount][0] = pxNew; | |
1104 | pNew[icount][1] = pyNew; | |
1105 | pNew[icount][2] = plNew; | |
1106 | pNew[icount][3] = eNew; | |
1107 | kNew[icount] = i; | |
1108 | icount++; | |
1109 | } // parton loop | |
0f482ae4 | 1110 | // |
6e90ad26 | 1111 | // Check if there was phase-space for quenching |
0f482ae4 | 1112 | // |
0f482ae4 | 1113 | |
6e90ad26 | 1114 | if (icount == 0) quenched[isys] = kFALSE; |
1115 | if (!quenched[isys]) break; | |
1116 | ||
1117 | for (Int_t j = 0; j < 4; j++) | |
1118 | { | |
1119 | p2[isys][j] = p0[isys][j] - p1[isys][j]; | |
1120 | } | |
1121 | 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 | 1122 | if (p2[isys][4] > 0.) { |
1123 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); | |
1124 | break; | |
1125 | } else { | |
b280c4cc | 1126 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); |
4e383037 | 1127 | 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 | 1128 | if (p2[isys][4] < -0.01) { |
4e383037 | 1129 | printf("Negative mass squared !\n"); |
1130 | // Here we have to put the gluon back to mass shell | |
1131 | // This will lead to a small energy imbalance | |
1132 | p2[isys][4] = 0.; | |
1133 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); | |
1134 | break; | |
6e90ad26 | 1135 | } else { |
1136 | p2[isys][4] = 0.; | |
1137 | break; | |
1138 | } | |
1139 | } | |
6e90ad26 | 1140 | /* |
6e90ad26 | 1141 | zHeavy *= 0.98; |
1142 | printf("zHeavy lowered to %f\n", zHeavy); | |
1143 | if (zHeavy < 0.01) { | |
1144 | printf("No success ! \n"); | |
1145 | icount = 0; | |
1146 | quenched[isys] = kFALSE; | |
1147 | break; | |
1148 | } | |
4e383037 | 1149 | */ |
1150 | } // iteration on z (while) | |
1151 | ||
6e90ad26 | 1152 | // Update event record |
1153 | for (Int_t k = 0; k < icount; k++) { | |
1154 | // 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] ); | |
1155 | fPyjets->P[0][kNew[k]] = pNew[k][0]; | |
1156 | fPyjets->P[1][kNew[k]] = pNew[k][1]; | |
1157 | fPyjets->P[2][kNew[k]] = pNew[k][2]; | |
1158 | fPyjets->P[3][kNew[k]] = pNew[k][3]; | |
0f482ae4 | 1159 | } |
4e383037 | 1160 | // |
1161 | // Add the gluons | |
1162 | // | |
1163 | Int_t ish = 0; | |
1837e95c | 1164 | Int_t iGlu; |
4e383037 | 1165 | if (!quenched[isys]) continue; |
0f482ae4 | 1166 | // |
1167 | // Last parton from shower i | |
4e383037 | 1168 | Int_t in = klast[isys]; |
0f482ae4 | 1169 | // |
1170 | // Continue if no parton in shower i selected | |
1171 | if (in == -1) continue; | |
1172 | // | |
1173 | // If this is the second initial parton and it is behind the first move pointer by previous ish | |
4e383037 | 1174 | if (isys == 1 && klast[1] > klast[0]) in += ish; |
0f482ae4 | 1175 | // |
1176 | // Starting index | |
452af8c7 | 1177 | |
4e383037 | 1178 | // jmin = in - 1; |
0f482ae4 | 1179 | // How many additional gluons will be generated |
1180 | ish = 1; | |
4e383037 | 1181 | if (p2[isys][4] > 0.05) ish = 2; |
0f482ae4 | 1182 | // |
1183 | // Position of gluons | |
4e383037 | 1184 | iGlu = numpart; |
1185 | if (iglu == 0) igMin = iGlu; | |
1186 | igMax = iGlu; | |
0f482ae4 | 1187 | numpart += ish; |
1188 | (fPyjets->N) += ish; | |
4e383037 | 1189 | |
0f482ae4 | 1190 | if (ish == 1) { |
4e383037 | 1191 | fPyjets->P[0][iGlu] = p2[isys][0]; |
1192 | fPyjets->P[1][iGlu] = p2[isys][1]; | |
1193 | fPyjets->P[2][iGlu] = p2[isys][2]; | |
1194 | fPyjets->P[3][iGlu] = p2[isys][3]; | |
1195 | fPyjets->P[4][iGlu] = p2[isys][4]; | |
0f482ae4 | 1196 | |
4e383037 | 1197 | fPyjets->K[0][iGlu] = 1; |
1198 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; | |
0f482ae4 | 1199 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1200 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1201 | fPyjets->K[3][iGlu] = -1; |
1202 | fPyjets->K[4][iGlu] = -1; | |
4e383037 | 1203 | |
1204 | pg[0] += p2[isys][0]; | |
1205 | pg[1] += p2[isys][1]; | |
1206 | pg[2] += p2[isys][2]; | |
1207 | pg[3] += p2[isys][3]; | |
0f482ae4 | 1208 | } else { |
1209 | // | |
1210 | // Split gluon in rest frame. | |
1211 | // | |
4e383037 | 1212 | Double_t bx = p2[isys][0] / p2[isys][3]; |
1213 | Double_t by = p2[isys][1] / p2[isys][3]; | |
1214 | Double_t bz = p2[isys][2] / p2[isys][3]; | |
1215 | Double_t pst = p2[isys][4] / 2.; | |
0f482ae4 | 1216 | // |
1217 | // Isotropic decay ???? | |
1218 | Double_t cost = 2. * gRandom->Rndm() - 1.; | |
60e55aee | 1219 | Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost)); |
2ab330c9 | 1220 | Double_t phis = 2. * TMath::Pi() * gRandom->Rndm(); |
0f482ae4 | 1221 | |
1222 | Double_t pz1 = pst * cost; | |
1223 | Double_t pz2 = -pst * cost; | |
1224 | Double_t pt1 = pst * sint; | |
1225 | Double_t pt2 = -pst * sint; | |
2ab330c9 | 1226 | Double_t px1 = pt1 * TMath::Cos(phis); |
1227 | Double_t py1 = pt1 * TMath::Sin(phis); | |
1228 | Double_t px2 = pt2 * TMath::Cos(phis); | |
1229 | Double_t py2 = pt2 * TMath::Sin(phis); | |
0f482ae4 | 1230 | |
1231 | fPyjets->P[0][iGlu] = px1; | |
1232 | fPyjets->P[1][iGlu] = py1; | |
1233 | fPyjets->P[2][iGlu] = pz1; | |
1234 | fPyjets->P[3][iGlu] = pst; | |
1235 | fPyjets->P[4][iGlu] = 0.; | |
1236 | ||
4e383037 | 1237 | fPyjets->K[0][iGlu] = 1 ; |
0f482ae4 | 1238 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1239 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1240 | fPyjets->K[3][iGlu] = -1; |
1241 | fPyjets->K[4][iGlu] = -1; | |
1242 | ||
1243 | fPyjets->P[0][iGlu+1] = px2; | |
1244 | fPyjets->P[1][iGlu+1] = py2; | |
1245 | fPyjets->P[2][iGlu+1] = pz2; | |
1246 | fPyjets->P[3][iGlu+1] = pst; | |
1247 | fPyjets->P[4][iGlu+1] = 0.; | |
1248 | ||
4e383037 | 1249 | fPyjets->K[0][iGlu+1] = 1; |
1250 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; | |
0f482ae4 | 1251 | fPyjets->K[1][iGlu+1] = 21; |
4e383037 | 1252 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1253 | fPyjets->K[3][iGlu+1] = -1; |
1254 | fPyjets->K[4][iGlu+1] = -1; | |
1255 | SetMSTU(1,0); | |
1256 | SetMSTU(2,0); | |
1257 | // | |
1258 | // Boost back | |
1259 | // | |
1260 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); | |
1261 | } | |
4e383037 | 1262 | /* |
1263 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { | |
1264 | Double_t px, py, pz; | |
1265 | px = fPyjets->P[0][ig]; | |
1266 | py = fPyjets->P[1][ig]; | |
1267 | pz = fPyjets->P[2][ig]; | |
1268 | TVector3 v(px, py, pz); | |
1269 | v.RotateZ(-phiq[isys]); | |
1270 | v.RotateY(-thetaq[isys]); | |
1271 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); | |
1272 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1273 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); | |
1274 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); | |
1275 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1276 | pxs += jtKick * TMath::Cos(phiKick); | |
1277 | pys += jtKick * TMath::Sin(phiKick); | |
1278 | TVector3 w(pxs, pys, pzs); | |
1279 | w.RotateY(thetaq[isys]); | |
1280 | w.RotateZ(phiq[isys]); | |
1281 | fPyjets->P[0][ig] = w.X(); | |
1282 | fPyjets->P[1][ig] = w.Y(); | |
1283 | fPyjets->P[2][ig] = w.Z(); | |
1284 | fPyjets->P[2][ig] = w.Mag(); | |
1285 | } | |
1286 | */ | |
1287 | } // kGluon | |
1288 | ||
6e90ad26 | 1289 | |
4e383037 | 1290 | // Check energy conservation |
0f482ae4 | 1291 | Double_t pxs = 0.; |
1292 | Double_t pys = 0.; | |
1293 | Double_t pzs = 0.; | |
1294 | Double_t es = 14000.; | |
1295 | ||
1296 | for (Int_t i = 0; i < numpart; i++) | |
1297 | { | |
1298 | kst = fPyjets->K[0][i]; | |
1299 | if (kst != 1 && kst != 2) continue; | |
1300 | pxs += fPyjets->P[0][i]; | |
1301 | pys += fPyjets->P[1][i]; | |
1302 | pzs += fPyjets->P[2][i]; | |
1303 | es -= fPyjets->P[3][i]; | |
1304 | } | |
1305 | if (TMath::Abs(pxs) > 1.e-2 || | |
1306 | TMath::Abs(pys) > 1.e-2 || | |
1307 | TMath::Abs(pzs) > 1.e-1) { | |
1308 | printf("%e %e %e %e\n", pxs, pys, pzs, es); | |
4e383037 | 1309 | // Fatal("Quench()", "4-Momentum non-conservation"); |
452af8c7 | 1310 | } |
4e383037 | 1311 | |
1312 | } // end quenching loop (systems) | |
6e90ad26 | 1313 | // Clean-up |
0f482ae4 | 1314 | for (Int_t i = 0; i < numpart; i++) |
1315 | { | |
4e383037 | 1316 | imo = fPyjets->K[2][i]; |
1317 | if (imo > 1000) { | |
1318 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; | |
1319 | } | |
0f482ae4 | 1320 | } |
4e383037 | 1321 | // this->Pylist(1); |
0f482ae4 | 1322 | } // end quench |
90d7b703 | 1323 | |
992f2843 | 1324 | |
1325 | void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b) | |
1326 | { | |
1327 | // Igor Lokthine's quenching routine | |
12cb0bc0 | 1328 | // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt |
1329 | ||
992f2843 | 1330 | pyquen(a, ibf, b); |
1331 | } | |
b280c4cc | 1332 | |
12cb0bc0 | 1333 | void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl) |
1334 | { | |
1335 | // Set the parameters for the PYQUEN package. | |
1336 | // See comments in PyquenCommon.h | |
1337 | ||
1338 | ||
1339 | PYQPAR.t0 = t0; | |
1340 | PYQPAR.tau0 = tau0; | |
1341 | PYQPAR.nf = nf; | |
1342 | PYQPAR.iengl = iengl; | |
1343 | PYQPAR.iangl = iangl; | |
1344 | } | |
1345 | ||
1346 | ||
16a82508 | 1347 | void AliPythia::Pyevnw() |
1348 | { | |
1349 | // New multiple interaction scenario | |
1350 | pyevnw(); | |
1351 | } | |
1352 | ||
cd07c39b | 1353 | void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax) |
1354 | { | |
1355 | // Call medium-modified Pythia jet reconstruction algorithm | |
1356 | // | |
1357 | pyshowq(ip1, ip2, qmax); | |
1358 | } | |
6c43eccb | 1359 | void AliPythia::Qpygin0() |
1360 | { | |
1361 | // New multiple interaction scenario | |
1362 | qpygin0(); | |
1363 | } | |
cd07c39b | 1364 | |
b280c4cc | 1365 | void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) |
1366 | { | |
1367 | // Return event specific quenching parameters | |
1368 | xp = fXJet; | |
1369 | yp = fYJet; | |
1370 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; | |
1371 | ||
1372 | } | |
1373 | ||
3dc3ec94 | 1374 | void AliPythia::ConfigHeavyFlavor() |
1375 | { | |
1376 | // | |
1377 | // Default configuration for Heavy Flavor production | |
1378 | // | |
1379 | // All QCD processes | |
1380 | // | |
1381 | SetMSEL(1); | |
1382 | ||
ef185c83 | 1383 | |
1384 | if (fItune < 0) { | |
1385 | // No multiple interactions | |
1386 | SetMSTP(81,0); | |
1387 | SetPARP(81, 0.); | |
1388 | SetPARP(82, 0.); | |
1389 | } | |
3dc3ec94 | 1390 | // Initial/final parton shower on (Pythia default) |
1391 | SetMSTP(61,1); | |
1392 | SetMSTP(71,1); | |
1393 | ||
1394 | // 2nd order alpha_s | |
1395 | SetMSTP(2,2); | |
1396 | ||
1397 | // QCD scales | |
1398 | SetMSTP(32,2); | |
1399 | SetPARP(34,1.0); | |
1400 | } | |
e0e89f40 | 1401 | |
1402 | void AliPythia::AtlasTuning() | |
1403 | { | |
1404 | // | |
1405 | // Configuration for the ATLAS tuning | |
0bd3d7c5 | 1406 | if (fItune > -1) return; |
1407 | printf("ATLAS TUNE \n"); | |
1408 | ||
1409 | SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf | |
1410 | SetMSTP(81,1); // Multiple Interactions ON | |
1411 | SetMSTP(82,4); // Double Gaussian Model | |
1412 | SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14) | |
1413 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
1414 | SetPARP(89,1000.); // [GeV] Ref. energy | |
1415 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
1416 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
1417 | SetPARP(84,0.5); // Core radius | |
1418 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
1419 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
1420 | SetPARP(67,1); // Regulates Initial State Radiation | |
1421 | } | |
1422 | ||
1423 | void AliPythia::AtlasTuning_MC09() | |
1424 | { | |
1425 | // | |
1426 | // Configuration for the ATLAS tuning | |
1427 | if (fItune > -1) return; | |
1428 | printf("ATLAS New TUNE MC09\n"); | |
1429 | SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model | |
1430 | SetMSTP(82, 4); // Double Gaussian Model | |
1431 | SetMSTP(52, 2); // External PDF | |
1432 | SetMSTP(51, 20650); // MRST LO* | |
1433 | ||
1434 | ||
1435 | SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR | |
1436 | SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR | |
1437 | SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant | |
1438 | SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT | |
1439 | ||
1440 | SetPARP(78, 0.3); // the amount of color reconnection in the final state | |
1441 | SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant | |
1442 | SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy | |
1443 | SetPARP(83, 0.8); // Core density in proton matter distribution (def.value) | |
1444 | SetPARP(84, 0.7); // Core radius | |
1445 | SetPARP(90, 0.25); // 2*epsilon (exponent in power law) | |
1446 | SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers | |
1447 | ||
1448 | SetMSTP(95, 6); | |
1449 | SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF | |
1450 | SetPARJ(42, 0.58); | |
1451 | SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks | |
1452 | SetPARP(89,1800.); // [GeV] Ref. energy | |
e0e89f40 | 1453 | } |
e8a8adcd | 1454 | |
1455 | AliPythia& AliPythia::operator=(const AliPythia& rhs) | |
1456 | { | |
1457 | // Assignment operator | |
1458 | rhs.Copy(*this); | |
1459 | return *this; | |
1460 | } | |
1461 | ||
1462 | void AliPythia::Copy(TObject&) const | |
1463 | { | |
1464 | // | |
1465 | // Copy | |
1466 | // | |
1467 | Fatal("Copy","Not implemented!\n"); | |
1468 | } | |
cd07c39b | 1469 | |
03358a32 | 1470 | void AliPythia::DalitzDecays() |
1471 | { | |
1472 | ||
1473 | // | |
1474 | // Replace all omega dalitz decays with the correct matrix element decays | |
1475 | // | |
1476 | Int_t nt = fPyjets->N; | |
1477 | for (Int_t i = 0; i < nt; i++) { | |
1478 | if (fPyjets->K[1][i] != 223) continue; | |
1479 | Int_t fd = fPyjets->K[3][i] - 1; | |
1480 | Int_t ld = fPyjets->K[4][i] - 1; | |
1481 | if (fd < 0) continue; | |
1482 | if ((ld - fd) != 2) continue; | |
1483 | if ((fPyjets->K[1][fd] != 111) || | |
ba4e47a0 | 1484 | ((TMath::Abs(fPyjets->K[1][fd+1]) != 11) && (TMath::Abs(fPyjets->K[1][fd+1]) != 13))) |
1485 | continue; | |
03358a32 | 1486 | TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]); |
ba4e47a0 | 1487 | Int_t pdg = TMath::Abs(fPyjets->K[1][fd+1]); |
1488 | fOmegaDalitz.Decay(pdg, &omega); | |
03358a32 | 1489 | for (Int_t j = 0; j < 3; j++) { |
1490 | for (Int_t k = 0; k < 4; k++) { | |
1491 | TLorentzVector vec = (fOmegaDalitz.Products())[2-j]; | |
1492 | fPyjets->P[k][fd+j] = vec[k]; | |
1493 | } | |
1494 | } | |
1495 | } | |
1496 | } |