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