| 39d810c8 |
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: AliPythia.cxx,v 1.40 2007/10/09 08:43:24 morsch Exp $ */ |
| 18 | |
| 19 | #include "AliPythia6.h" |
| 20 | #include "AliStack.h" |
| 21 | #include "AliPythiaRndm.h" |
| 22 | #include "AliFastGlauber.h" |
| 23 | #include "AliQuenchingWeights.h" |
| 24 | |
| 25 | #include "TVector3.h" |
| 26 | #include "TParticle.h" |
| 27 | #include "PyquenCommon.h" |
| 28 | |
| 29 | ClassImp(AliPythia6) |
| 30 | |
| 31 | #ifndef WIN32 |
| 32 | # define pyclus pyclus_ |
| 33 | # define pycell pycell_ |
| 34 | # define pyshow pyshow_ |
| 35 | # define pyrobo pyrobo_ |
| 36 | # define pyquen pyquen_ |
| 37 | # define pyevnw pyevnw_ |
| 38 | # define type_of_call |
| 39 | #else |
| 40 | # define pyclus PYCLUS |
| 41 | # define pycell PYCELL |
| 42 | # define pyrobo PYROBO |
| 43 | # define pyquen PYQUEN |
| 44 | # define pyevnw PYEVNW |
| 45 | # define type_of_call _stdcall |
| 46 | #endif |
| 47 | |
| 48 | extern "C" void type_of_call pyclus(Int_t & ); |
| 49 | extern "C" void type_of_call pycell(Int_t & ); |
| 50 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); |
| 51 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); |
| 52 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); |
| 53 | extern "C" void type_of_call pyevnw(); |
| 54 | |
| 55 | |
| 56 | //_____________________________________________________________________________ |
| 57 | |
| 58 | AliPythia6* AliPythia6::fgAliPythia=NULL; |
| 59 | |
| 60 | AliPythia6::AliPythia6(): |
| 61 | TPythia6(), |
| 62 | AliPythiaBase(), |
| 63 | fProcess(kPyMb), |
| 64 | fEcms(0.), |
| 65 | fStrucFunc(kCTEQ5L), |
| 66 | fXJet(0.), |
| 67 | fYJet(0.), |
| 68 | fNGmax(30), |
| 69 | fZmax(0.97), |
| 70 | fGlauber(0), |
| 71 | fQuenchingWeights(0) |
| 72 | { |
| 73 | // Default Constructor |
| 74 | // |
| 75 | // Set random number |
| 76 | if (!AliPythiaRndm::GetPythiaRandom()) |
| 77 | AliPythiaRndm::SetPythiaRandom(GetRandom()); |
| 78 | fGlauber = 0; |
| 79 | fQuenchingWeights = 0; |
| 80 | } |
| 81 | |
| 82 | AliPythia6::AliPythia6(const AliPythia6& pythia): |
| 83 | TPythia6(), |
| 84 | AliPythiaBase(), |
| 85 | fProcess(kPyMb), |
| 86 | fEcms(0.), |
| 87 | fStrucFunc(kCTEQ5L), |
| 88 | fXJet(0.), |
| 89 | fYJet(0.), |
| 90 | fNGmax(30), |
| 91 | fZmax(0.97), |
| 92 | fGlauber(0), |
| 93 | fQuenchingWeights(0) |
| 94 | { |
| 95 | // Copy Constructor |
| 96 | pythia.Copy(*this); |
| 97 | } |
| 98 | |
| 99 | void AliPythia6::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) |
| 100 | { |
| 101 | // Initialise the process to generate |
| 102 | if (!AliPythiaRndm::GetPythiaRandom()) |
| 103 | AliPythiaRndm::SetPythiaRandom(GetRandom()); |
| 104 | |
| 105 | fProcess = process; |
| 106 | fEcms = energy; |
| 107 | fStrucFunc = strucfunc; |
| 108 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. |
| 109 | SetMDCY(Pycomp(111) ,1,0); |
| 110 | SetMDCY(Pycomp(310) ,1,0); |
| 111 | SetMDCY(Pycomp(3122),1,0); |
| 112 | SetMDCY(Pycomp(3112),1,0); |
| 113 | SetMDCY(Pycomp(3212),1,0); |
| 114 | SetMDCY(Pycomp(3222),1,0); |
| 115 | SetMDCY(Pycomp(3312),1,0); |
| 116 | SetMDCY(Pycomp(3322),1,0); |
| 117 | SetMDCY(Pycomp(3334),1,0); |
| 118 | // Select structure function |
| 119 | SetMSTP(52,2); |
| 120 | SetMSTP(51,AliStructFuncType::PDFsetIndex(strucfunc)); |
| 121 | // Particles produced in string fragmentation point directly to either of the two endpoints |
| 122 | // of the string (depending in the side they were generated from). |
| 123 | SetMSTU(16,2); |
| 124 | |
| 125 | // |
| 126 | // Pythia initialisation for selected processes// |
| 127 | // |
| 128 | // Make MSEL clean |
| 129 | // |
| 130 | for (Int_t i=1; i<= 200; i++) { |
| 131 | SetMSUB(i,0); |
| 132 | } |
| 133 | // select charm production |
| 134 | switch (process) |
| 135 | { |
| 136 | case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes |
| 137 | // Multiple interactions on. |
| 138 | SetMSTP(81,1); |
| 139 | // Double Gaussian matter distribution. |
| 140 | SetMSTP(82,4); |
| 141 | SetPARP(83,0.5); |
| 142 | SetPARP(84,0.4); |
| 143 | // pT0. |
| 144 | SetPARP(82,2.0); |
| 145 | // Reference energy for pT0 and energy rescaling pace. |
| 146 | SetPARP(89,1800); |
| 147 | SetPARP(90,0.25); |
| 148 | // String drawing almost completely minimizes string length. |
| 149 | SetPARP(85,0.9); |
| 150 | SetPARP(86,0.95); |
| 151 | // ISR and FSR activity. |
| 152 | SetPARP(67,4); |
| 153 | SetPARP(71,4); |
| 154 | // Lambda_FSR scale. |
| 155 | SetPARJ(81,0.29); |
| 156 | break; |
| 157 | case kPyOldUEQ2ordered2: |
| 158 | // Old underlying events with Q2 ordered QCD processes |
| 159 | // Multiple interactions on. |
| 160 | SetMSTP(81,1); |
| 161 | // Double Gaussian matter distribution. |
| 162 | SetMSTP(82,4); |
| 163 | SetPARP(83,0.5); |
| 164 | SetPARP(84,0.4); |
| 165 | // pT0. |
| 166 | SetPARP(82,2.0); |
| 167 | // Reference energy for pT0 and energy rescaling pace. |
| 168 | SetPARP(89,1800); |
| 169 | SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered |
| 170 | // String drawing almost completely minimizes string length. |
| 171 | SetPARP(85,0.9); |
| 172 | SetPARP(86,0.95); |
| 173 | // ISR and FSR activity. |
| 174 | SetPARP(67,4); |
| 175 | SetPARP(71,4); |
| 176 | // Lambda_FSR scale. |
| 177 | SetPARJ(81,0.29); |
| 178 | break; |
| 179 | case kPyOldPopcorn: |
| 180 | // Old production mechanism: Old Popcorn |
| 181 | SetMSEL(1); |
| 182 | SetMSTJ(12,3); |
| 183 | // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon |
| 184 | SetMSTP(88,2); |
| 185 | // (D=1)see can be used to form baryons (BARYON JUNCTION) |
| 186 | SetMSTJ(1,1); |
| 187 | AtlasTuning(); |
| 188 | break; |
| 189 | case kPyCharm: |
| 190 | SetMSEL(4); |
| 191 | // heavy quark masses |
| 192 | |
| 193 | SetPMAS(4,1,1.2); |
| 194 | // |
| 195 | // primordial pT |
| 196 | SetMSTP(91,1); |
| 197 | SetPARP(91,1.); |
| 198 | SetPARP(93,5.); |
| 199 | // |
| 200 | break; |
| 201 | case kPyBeauty: |
| 202 | SetMSEL(5); |
| 203 | SetPMAS(5,1,4.75); |
| 204 | break; |
| 205 | case kPyJpsi: |
| 206 | SetMSEL(0); |
| 207 | // gg->J/Psi g |
| 208 | SetMSUB(86,1); |
| 209 | break; |
| 210 | case kPyJpsiChi: |
| 211 | SetMSEL(0); |
| 212 | // gg->J/Psi g |
| 213 | SetMSUB(86,1); |
| 214 | // gg-> chi_0c g |
| 215 | SetMSUB(87,1); |
| 216 | // gg-> chi_1c g |
| 217 | SetMSUB(88,1); |
| 218 | // gg-> chi_2c g |
| 219 | SetMSUB(89,1); |
| 220 | break; |
| 221 | case kPyCharmUnforced: |
| 222 | SetMSEL(0); |
| 223 | // gq->qg |
| 224 | SetMSUB(28,1); |
| 225 | // gg->qq |
| 226 | SetMSUB(53,1); |
| 227 | // gg->gg |
| 228 | SetMSUB(68,1); |
| 229 | break; |
| 230 | case kPyBeautyUnforced: |
| 231 | SetMSEL(0); |
| 232 | // gq->qg |
| 233 | SetMSUB(28,1); |
| 234 | // gg->qq |
| 235 | SetMSUB(53,1); |
| 236 | // gg->gg |
| 237 | SetMSUB(68,1); |
| 238 | break; |
| 239 | case kPyMb: |
| 240 | // Minimum Bias pp-Collisions |
| 241 | // |
| 242 | // |
| 243 | // select Pythia min. bias model |
| 244 | SetMSEL(0); |
| 245 | SetMSUB(92,1); // single diffraction AB-->XB |
| 246 | SetMSUB(93,1); // single diffraction AB-->AX |
| 247 | SetMSUB(94,1); // double diffraction |
| 248 | SetMSUB(95,1); // low pt production |
| 249 | |
| 250 | AtlasTuning(); |
| 251 | break; |
| 252 | case kPyMbDefault: |
| 253 | // Minimum Bias pp-Collisions |
| 254 | // |
| 255 | // |
| 256 | // select Pythia min. bias model |
| 257 | SetMSEL(0); |
| 258 | SetMSUB(92,1); // single diffraction AB-->XB |
| 259 | SetMSUB(93,1); // single diffraction AB-->AX |
| 260 | SetMSUB(94,1); // double diffraction |
| 261 | SetMSUB(95,1); // low pt production |
| 262 | |
| 263 | break; |
| 264 | case kPyLhwgMb: |
| 265 | // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120 |
| 266 | // -> Pythia 6.3 or above is needed |
| 267 | // |
| 268 | SetMSEL(0); |
| 269 | SetMSUB(92,1); // single diffraction AB-->XB |
| 270 | SetMSUB(93,1); // single diffraction AB-->AX |
| 271 | SetMSUB(94,1); // double diffraction |
| 272 | SetMSUB(95,1); // low pt production |
| 273 | SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); |
| 274 | SetMSTP(52,2); |
| 275 | SetMSTP(68,1); |
| 276 | SetMSTP(70,2); |
| 277 | SetMSTP(81,1); // Multiple Interactions ON |
| 278 | SetMSTP(82,4); // Double Gaussian Model |
| 279 | SetMSTP(88,1); |
| 280 | |
| 281 | SetPARP(82,2.3); // [GeV] PT_min at Ref. energy |
| 282 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) |
| 283 | SetPARP(84,0.5); // Core radius |
| 284 | SetPARP(85,0.9); // Regulates gluon prod. mechanism |
| 285 | SetPARP(90,0.2); // 2*epsilon (exponent in power law) |
| 286 | |
| 287 | break; |
| 288 | case kPyMbNonDiffr: |
| 289 | // Minimum Bias pp-Collisions |
| 290 | // |
| 291 | // |
| 292 | // select Pythia min. bias model |
| 293 | SetMSEL(0); |
| 294 | SetMSUB(95,1); // low pt production |
| 295 | |
| 296 | AtlasTuning(); |
| 297 | break; |
| 298 | case kPyMbMSEL1: |
| 299 | ConfigHeavyFlavor(); |
| 300 | // Intrinsic <kT^2> |
| 301 | SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons |
| 302 | SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2 |
| 303 | SetPARP(93,5.); // Upper cut-off |
| 304 | // Set Q-quark mass |
| 305 | SetPMAS(4,1,1.2); // Charm quark mass |
| 306 | SetPMAS(5,1,4.78); // Beauty quark mass |
| 307 | SetPARP(71,4.); // Defaut value |
| 308 | // Atlas Tuning |
| 309 | AtlasTuning(); |
| 310 | break; |
| 311 | case kPyJets: |
| 312 | // |
| 313 | // QCD Jets |
| 314 | // |
| 315 | SetMSEL(1); |
| 316 | // Pythia Tune A (CDF) |
| 317 | // |
| 318 | SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis) |
| 319 | SetMSTP(82,4); // Double Gaussian Model |
| 320 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy |
| 321 | SetPARP(84,0.4); // Core radius |
| 322 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism |
| 323 | SetPARP(86,0.95); // Regulates gluon prod. mechanism |
| 324 | SetPARP(89,1800.); // [GeV] Ref. energy |
| 325 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) |
| 326 | break; |
| 327 | case kPyDirectGamma: |
| 328 | SetMSEL(10); |
| 329 | break; |
| 330 | case kPyCharmPbPbMNR: |
| 331 | case kPyD0PbPbMNR: |
| 332 | case kPyDPlusPbPbMNR: |
| 333 | case kPyDPlusStrangePbPbMNR: |
| 334 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 335 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 336 | // c-cbar single inclusive and double differential distributions. |
| 337 | // This parameter settings are meant to work with Pb-Pb collisions |
| 338 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
| 339 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
| 340 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
| 341 | ConfigHeavyFlavor(); |
| 342 | // Intrinsic <kT> |
| 343 | SetMSTP(91,1); |
| 344 | SetPARP(91,1.304); |
| 345 | SetPARP(93,6.52); |
| 346 | // Set c-quark mass |
| 347 | SetPMAS(4,1,1.2); |
| 348 | break; |
| 349 | case kPyCharmpPbMNR: |
| 350 | case kPyD0pPbMNR: |
| 351 | case kPyDPluspPbMNR: |
| 352 | case kPyDPlusStrangepPbMNR: |
| 353 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 354 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 355 | // c-cbar single inclusive and double differential distributions. |
| 356 | // This parameter settings are meant to work with p-Pb collisions |
| 357 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
| 358 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
| 359 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
| 360 | ConfigHeavyFlavor(); |
| 361 | // Intrinsic <kT> |
| 362 | SetMSTP(91,1); |
| 363 | SetPARP(91,1.16); |
| 364 | SetPARP(93,5.8); |
| 365 | |
| 366 | // Set c-quark mass |
| 367 | SetPMAS(4,1,1.2); |
| 368 | break; |
| 369 | case kPyCharmppMNR: |
| 370 | case kPyD0ppMNR: |
| 371 | case kPyDPlusppMNR: |
| 372 | case kPyDPlusStrangeppMNR: |
| 373 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 374 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 375 | // c-cbar single inclusive and double differential distributions. |
| 376 | // This parameter settings are meant to work with pp collisions |
| 377 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
| 378 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
| 379 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
| 380 | ConfigHeavyFlavor(); |
| 381 | // Intrinsic <kT^2> |
| 382 | SetMSTP(91,1); |
| 383 | SetPARP(91,1.); |
| 384 | SetPARP(93,5.); |
| 385 | |
| 386 | // Set c-quark mass |
| 387 | SetPMAS(4,1,1.2); |
| 388 | break; |
| 389 | case kPyCharmppMNRwmi: |
| 390 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 391 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 392 | // c-cbar single inclusive and double differential distributions. |
| 393 | // This parameter settings are meant to work with pp collisions |
| 394 | // and with kCTEQ5L PDFs. |
| 395 | // Added multiple interactions according to ATLAS tune settings. |
| 396 | // To get a "reasonable" agreement with MNR results, events have to be |
| 397 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) |
| 398 | // set to 2.76 GeV. |
| 399 | // To get a "perfect" agreement with MNR results, events have to be |
| 400 | // generated in four ptHard bins with the following relative |
| 401 | // normalizations: |
| 402 | // 2.76-3 GeV: 25% |
| 403 | // 3-4 GeV: 40% |
| 404 | // 4-8 GeV: 29% |
| 405 | // >8 GeV: 6% |
| 406 | ConfigHeavyFlavor(); |
| 407 | // Intrinsic <kT^2> |
| 408 | SetMSTP(91,1); |
| 409 | SetPARP(91,1.); |
| 410 | SetPARP(93,5.); |
| 411 | |
| 412 | // Set c-quark mass |
| 413 | SetPMAS(4,1,1.2); |
| 414 | AtlasTuning(); |
| 415 | break; |
| 416 | case kPyBeautyPbPbMNR: |
| 417 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 418 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 419 | // b-bbar single inclusive and double differential distributions. |
| 420 | // This parameter settings are meant to work with Pb-Pb collisions |
| 421 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
| 422 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
| 423 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. |
| 424 | ConfigHeavyFlavor(); |
| 425 | // QCD scales |
| 426 | SetPARP(67,1.0); |
| 427 | SetPARP(71,1.0); |
| 428 | // Intrinsic <kT> |
| 429 | SetMSTP(91,1); |
| 430 | SetPARP(91,2.035); |
| 431 | SetPARP(93,10.17); |
| 432 | // Set b-quark mass |
| 433 | SetPMAS(5,1,4.75); |
| 434 | break; |
| 435 | case kPyBeautypPbMNR: |
| 436 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 437 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 438 | // b-bbar single inclusive and double differential distributions. |
| 439 | // This parameter settings are meant to work with p-Pb collisions |
| 440 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
| 441 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
| 442 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. |
| 443 | ConfigHeavyFlavor(); |
| 444 | // QCD scales |
| 445 | SetPARP(67,1.0); |
| 446 | SetPARP(71,1.0); |
| 447 | // Intrinsic <kT> |
| 448 | SetMSTP(91,1); |
| 449 | SetPARP(91,1.60); |
| 450 | SetPARP(93,8.00); |
| 451 | // Set b-quark mass |
| 452 | SetPMAS(5,1,4.75); |
| 453 | break; |
| 454 | case kPyBeautyppMNR: |
| 455 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 456 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 457 | // b-bbar single inclusive and double differential distributions. |
| 458 | // This parameter settings are meant to work with pp collisions |
| 459 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
| 460 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
| 461 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. |
| 462 | ConfigHeavyFlavor(); |
| 463 | // QCD scales |
| 464 | SetPARP(67,1.0); |
| 465 | SetPARP(71,1.0); |
| 466 | |
| 467 | // Intrinsic <kT> |
| 468 | SetMSTP(91,1); |
| 469 | SetPARP(91,1.); |
| 470 | SetPARP(93,5.); |
| 471 | |
| 472 | // Set b-quark mass |
| 473 | SetPMAS(5,1,4.75); |
| 474 | break; |
| 475 | case kPyBeautyppMNRwmi: |
| 476 | // Tuning of Pythia parameters aimed to get a resonable agreement |
| 477 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
| 478 | // b-bbar single inclusive and double differential distributions. |
| 479 | // This parameter settings are meant to work with pp collisions |
| 480 | // and with kCTEQ5L PDFs. |
| 481 | // Added multiple interactions according to ATLAS tune settings. |
| 482 | // To get a "reasonable" agreement with MNR results, events have to be |
| 483 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) |
| 484 | // set to 2.76 GeV. |
| 485 | // To get a "perfect" agreement with MNR results, events have to be |
| 486 | // generated in four ptHard bins with the following relative |
| 487 | // normalizations: |
| 488 | // 2.76-4 GeV: 5% |
| 489 | // 4-6 GeV: 31% |
| 490 | // 6-8 GeV: 28% |
| 491 | // >8 GeV: 36% |
| 492 | ConfigHeavyFlavor(); |
| 493 | // QCD scales |
| 494 | SetPARP(67,1.0); |
| 495 | SetPARP(71,1.0); |
| 496 | |
| 497 | // Intrinsic <kT> |
| 498 | SetMSTP(91,1); |
| 499 | SetPARP(91,1.); |
| 500 | SetPARP(93,5.); |
| 501 | |
| 502 | // Set b-quark mass |
| 503 | SetPMAS(5,1,4.75); |
| 504 | |
| 505 | AtlasTuning(); |
| 506 | break; |
| 507 | case kPyW: |
| 508 | |
| 509 | //Inclusive production of W+/- |
| 510 | SetMSEL(0); |
| 511 | //f fbar -> W+ |
| 512 | SetMSUB(2,1); |
| 513 | // //f fbar -> g W+ |
| 514 | // SetMSUB(16,1); |
| 515 | // //f fbar -> gamma W+ |
| 516 | // SetMSUB(20,1); |
| 517 | // //f g -> f W+ |
| 518 | // SetMSUB(31,1); |
| 519 | // //f gamma -> f W+ |
| 520 | // SetMSUB(36,1); |
| 521 | |
| 522 | // Initial/final parton shower on (Pythia default) |
| 523 | // With parton showers on we are generating "W inclusive process" |
| 524 | SetMSTP(61,1); //Initial QCD & QED showers on |
| 525 | SetMSTP(71,1); //Final QCD & QED showers on |
| 526 | |
| 527 | break; |
| 528 | |
| 529 | case kPyZ: |
| 530 | |
| 531 | //Inclusive production of Z |
| 532 | SetMSEL(0); |
| 533 | //f fbar -> Z/gamma |
| 534 | SetMSUB(1,1); |
| 535 | |
| 536 | // // f fbar -> g Z/gamma |
| 537 | // SetMSUB(15,1); |
| 538 | // // f fbar -> gamma Z/gamma |
| 539 | // SetMSUB(19,1); |
| 540 | // // f g -> f Z/gamma |
| 541 | // SetMSUB(30,1); |
| 542 | // // f gamma -> f Z/gamma |
| 543 | // SetMSUB(35,1); |
| 544 | |
| 545 | //only Z included, not gamma |
| 546 | SetMSTP(43,2); |
| 547 | |
| 548 | // Initial/final parton shower on (Pythia default) |
| 549 | // With parton showers on we are generating "Z inclusive process" |
| 550 | SetMSTP(61,1); //Initial QCD & QED showers on |
| 551 | SetMSTP(71,1); //Final QCD & QED showers on |
| 552 | |
| 553 | break; |
| 554 | |
| 555 | } |
| 556 | // |
| 557 | // Initialize PYTHIA |
| 558 | SetMSTP(41,1); // all resonance decays switched on |
| 559 | Initialize("CMS","p","p",fEcms); |
| 560 | |
| 561 | } |
| 562 | |
| 563 | Int_t AliPythia6::CheckedLuComp(Int_t kf) |
| 564 | { |
| 565 | // Check Lund particle code (for debugging) |
| 566 | Int_t kc=Pycomp(kf); |
| 567 | return kc; |
| 568 | } |
| 569 | |
| 570 | void AliPythia6::SetNuclei(Int_t a1, Int_t a2) |
| 571 | { |
| 572 | // Treat protons as inside nuclei with mass numbers a1 and a2 |
| 573 | // The MSTP array in the PYPARS common block is used to enable and |
| 574 | // select the nuclear structure functions. |
| 575 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library |
| 576 | // =1: internal PYTHIA acording to MSTP(51) |
| 577 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET |
| 578 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. |
| 579 | // MSTP(192) : Mass number of nucleus side 1 |
| 580 | // MSTP(193) : Mass number of nucleus side 2 |
| 581 | SetMSTP(52,2); |
| 582 | SetMSTP(192, a1); |
| 583 | SetMSTP(193, a2); |
| 584 | } |
| 585 | |
| 586 | |
| 587 | AliPythia6* AliPythia6::Instance() |
| 588 | { |
| 589 | // Set random number generator |
| 590 | if (fgAliPythia) { |
| 591 | return fgAliPythia; |
| 592 | } else { |
| 593 | fgAliPythia = new AliPythia6(); |
| 594 | return fgAliPythia; |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | void AliPythia6::PrintParticles() |
| 599 | { |
| 600 | // Print list of particl properties |
| 601 | Int_t np = 0; |
| 602 | char* name = new char[16]; |
| 603 | for (Int_t kf=0; kf<1000000; kf++) { |
| 604 | for (Int_t c = 1; c > -2; c-=2) { |
| 605 | Int_t kc = Pycomp(c*kf); |
| 606 | if (kc) { |
| 607 | Float_t mass = GetPMAS(kc,1); |
| 608 | Float_t width = GetPMAS(kc,2); |
| 609 | Float_t tau = GetPMAS(kc,4); |
| 610 | |
| 611 | Pyname(kf,name); |
| 612 | |
| 613 | np++; |
| 614 | |
| 615 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", |
| 616 | c*kf, name, mass, width, tau); |
| 617 | } |
| 618 | } |
| 619 | } |
| 620 | printf("\n Number of particles %d \n \n", np); |
| 621 | } |
| 622 | |
| 623 | void AliPythia6::ResetDecayTable() |
| 624 | { |
| 625 | // Set default values for pythia decay switches |
| 626 | Int_t i; |
| 627 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); |
| 628 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); |
| 629 | } |
| 630 | |
| 631 | void AliPythia6::SetDecayTable() |
| 632 | { |
| 633 | // Set default values for pythia decay switches |
| 634 | // |
| 635 | Int_t i; |
| 636 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); |
| 637 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); |
| 638 | } |
| 639 | |
| 640 | void AliPythia6::Pyclus(Int_t& njet) |
| 641 | { |
| 642 | // Call Pythia clustering algorithm |
| 643 | // |
| 644 | pyclus(njet); |
| 645 | } |
| 646 | |
| 647 | void AliPythia6::Pycell(Int_t& njet) |
| 648 | { |
| 649 | // Call Pythia jet reconstruction algorithm |
| 650 | // |
| 651 | pycell(njet); |
| 652 | } |
| 653 | |
| 654 | void AliPythia6::GetJet(Int_t i, Float_t& px, Float_t& py, Float_t& pz, Float_t& e) |
| 655 | { |
| 656 | // Get jet number i |
| 657 | Int_t n = GetN(); |
| 658 | px = GetPyjets()->P[0][n+i]; |
| 659 | py = GetPyjets()->P[1][n+i]; |
| 660 | pz = GetPyjets()->P[2][n+i]; |
| 661 | e = GetPyjets()->P[3][n+i]; |
| 662 | } |
| 663 | |
| 664 | void AliPythia6::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) |
| 665 | { |
| 666 | // Call Pythia showering |
| 667 | // |
| 668 | pyshow(ip1, ip2, qmax); |
| 669 | } |
| 670 | |
| 671 | void AliPythia6::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) |
| 672 | { |
| 673 | pyrobo(imi, ima, the, phi, bex, bey, bez); |
| 674 | } |
| 675 | |
| 676 | |
| 677 | |
| 678 | void AliPythia6::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax) |
| 679 | { |
| 680 | // Initializes |
| 681 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann |
| 682 | // (2) The nuclear geometry using the Glauber Model |
| 683 | // |
| 684 | |
| 685 | fGlauber = new AliFastGlauber(); |
| 686 | fGlauber->Init(2); |
| 687 | fGlauber->SetCentralityClass(cMin, cMax); |
| 688 | |
| 689 | fQuenchingWeights = new AliQuenchingWeights(); |
| 690 | fQuenchingWeights->InitMult(); |
| 691 | fQuenchingWeights->SetK(k); |
| 692 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); |
| 693 | fNGmax = ngmax; |
| 694 | fZmax = zmax; |
| 695 | |
| 696 | } |
| 697 | |
| 698 | |
| 699 | void AliPythia6::Quench() |
| 700 | { |
| 701 | // |
| 702 | // |
| 703 | // Simple Jet Quenching routine: |
| 704 | // ============================= |
| 705 | // The jet formed by all final state partons radiated by the parton created |
| 706 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in |
| 707 | // the initial parton reference frame: |
| 708 | // (E + p_z)new = (1-z) (E + p_z)old |
| 709 | // |
| 710 | // |
| 711 | // |
| 712 | // |
| 713 | // The lost momentum is first balanced by one gluon with virtuality > 0. |
| 714 | // Subsequently the gluon splits to yield two gluons with E = p. |
| 715 | // |
| 716 | // |
| 717 | // |
| 718 | static Float_t eMean = 0.; |
| 719 | static Int_t icall = 0; |
| 720 | |
| 721 | Double_t p0[4][5]; |
| 722 | Double_t p1[4][5]; |
| 723 | Double_t p2[4][5]; |
| 724 | Int_t klast[4] = {-1, -1, -1, -1}; |
| 725 | |
| 726 | Int_t numpart = fPyjets->N; |
| 727 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; |
| 728 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; |
| 729 | Bool_t quenched[4]; |
| 730 | Double_t wjtKick[4]; |
| 731 | Int_t nGluon[4]; |
| 732 | Int_t qPdg[4]; |
| 733 | Int_t imo, kst, pdg; |
| 734 | |
| 735 | // |
| 736 | // Sore information about Primary partons |
| 737 | // |
| 738 | // j = |
| 739 | // 0, 1 partons from hard scattering |
| 740 | // 2, 3 partons from initial state radiation |
| 741 | // |
| 742 | for (Int_t i = 2; i <= 7; i++) { |
| 743 | Int_t j = 0; |
| 744 | // Skip gluons that participate in hard scattering |
| 745 | if (i == 4 || i == 5) continue; |
| 746 | // Gluons from hard Scattering |
| 747 | if (i == 6 || i == 7) { |
| 748 | j = i - 6; |
| 749 | pxq[j] = fPyjets->P[0][i]; |
| 750 | pyq[j] = fPyjets->P[1][i]; |
| 751 | pzq[j] = fPyjets->P[2][i]; |
| 752 | eq[j] = fPyjets->P[3][i]; |
| 753 | mq[j] = fPyjets->P[4][i]; |
| 754 | } else { |
| 755 | // Gluons from initial state radiation |
| 756 | // |
| 757 | // Obtain 4-momentum vector from difference between original parton and parton after gluon |
| 758 | // radiation. Energy is calculated independently because initial state radition does not |
| 759 | // conserve strictly momentum and energy for each partonic system independently. |
| 760 | // |
| 761 | // Not very clean. Should be improved ! |
| 762 | // |
| 763 | // |
| 764 | j = i; |
| 765 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; |
| 766 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; |
| 767 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; |
| 768 | mq[j] = fPyjets->P[4][i]; |
| 769 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); |
| 770 | } |
| 771 | // |
| 772 | // Calculate some kinematic variables |
| 773 | // |
| 774 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); |
| 775 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); |
| 776 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); |
| 777 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); |
| 778 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); |
| 779 | qPdg[j] = fPyjets->K[1][i]; |
| 780 | } |
| 781 | |
| 782 | Double_t int0[4]; |
| 783 | Double_t int1[4]; |
| 784 | |
| 785 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); |
| 786 | |
| 787 | for (Int_t j = 0; j < 4; j++) { |
| 788 | // |
| 789 | // Quench only central jets and with E > 10. |
| 790 | // |
| 791 | |
| 792 | |
| 793 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; |
| 794 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); |
| 795 | |
| 796 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { |
| 797 | fZQuench[j] = 0.; |
| 798 | } else { |
| 799 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { |
| 800 | icall ++; |
| 801 | eMean += eloss; |
| 802 | } |
| 803 | // |
| 804 | // Extra pt |
| 805 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); |
| 806 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); |
| 807 | // |
| 808 | // Fractional energy loss |
| 809 | fZQuench[j] = eloss / eq[j]; |
| 810 | // |
| 811 | // Avoid complete loss |
| 812 | // |
| 1044c4d8 |
813 | if (fZQuench[j] > fZmax) fZQuench[j] = fZmax; |
| 39d810c8 |
814 | // |
| 815 | // Some debug printing |
| 816 | |
| 817 | |
| 818 | // 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", |
| 819 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); |
| 820 | |
| 821 | // fZQuench[j] = 0.8; |
| 822 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); |
| 823 | } |
| 824 | |
| 825 | quenched[j] = (fZQuench[j] > 0.01); |
| 826 | } // primary partons |
| 827 | |
| 828 | |
| 829 | |
| 830 | Double_t pNew[1000][4]; |
| 831 | Int_t kNew[1000]; |
| 832 | Int_t icount = 0; |
| 833 | Double_t zquench[4]; |
| 834 | |
| 835 | // |
| 836 | // System Loop |
| 837 | for (Int_t isys = 0; isys < 4; isys++) { |
| 838 | // Skip to next system if not quenched. |
| 839 | if (!quenched[isys]) continue; |
| 840 | |
| 841 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); |
| 842 | if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax; |
| 843 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); |
| 844 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); |
| 845 | |
| 846 | |
| 847 | |
| 848 | Int_t igMin = -1; |
| 849 | Int_t igMax = -1; |
| 850 | Double_t pg[4] = {0., 0., 0., 0.}; |
| 851 | |
| 852 | // |
| 853 | // Loop on radiation events |
| 854 | |
| 855 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { |
| 856 | while (1) { |
| 857 | icount = 0; |
| 858 | for (Int_t k = 0; k < 4; k++) |
| 859 | { |
| 860 | p0[isys][k] = 0.; |
| 861 | p1[isys][k] = 0.; |
| 862 | p2[isys][k] = 0.; |
| 863 | } |
| 864 | // Loop over partons |
| 865 | for (Int_t i = 0; i < numpart; i++) |
| 866 | { |
| 867 | imo = fPyjets->K[2][i]; |
| 868 | kst = fPyjets->K[0][i]; |
| 869 | pdg = fPyjets->K[1][i]; |
| 870 | |
| 871 | |
| 872 | |
| 873 | // Quarks and gluons only |
| 874 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; |
| 875 | // Particles from hard scattering only |
| 876 | |
| 877 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; |
| 878 | Int_t imom = imo % 1000; |
| 879 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; |
| 880 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; |
| 881 | |
| 882 | |
| 883 | // Skip comment lines |
| 884 | if (kst != 1 && kst != 2) continue; |
| 885 | // |
| 886 | // Parton kinematic |
| 887 | px = fPyjets->P[0][i]; |
| 888 | py = fPyjets->P[1][i]; |
| 889 | pz = fPyjets->P[2][i]; |
| 890 | e = fPyjets->P[3][i]; |
| 891 | m = fPyjets->P[4][i]; |
| 892 | pt = TMath::Sqrt(px * px + py * py); |
| 893 | p = TMath::Sqrt(px * px + py * py + pz * pz); |
| 894 | phi = TMath::Pi() + TMath::ATan2(-py, -px); |
| 895 | theta = TMath::ATan2(pt, pz); |
| 896 | |
| 897 | // |
| 898 | // Save 4-momentum sum for balancing |
| 899 | Int_t index = isys; |
| 900 | |
| 901 | p0[index][0] += px; |
| 902 | p0[index][1] += py; |
| 903 | p0[index][2] += pz; |
| 904 | p0[index][3] += e; |
| 905 | |
| 906 | klast[index] = i; |
| 907 | |
| 908 | // |
| 909 | // Fractional energy loss |
| 910 | Double_t z = zquench[index]; |
| 911 | |
| 912 | |
| 913 | // Don't fully quench radiated gluons |
| 914 | // |
| 915 | if (imo > 1000) { |
| 916 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination |
| 917 | // |
| 918 | |
| 919 | z = 0.02; |
| 920 | } |
| 921 | // printf("z: %d %f\n", imo, z); |
| 922 | |
| 923 | |
| 924 | // |
| 925 | |
| 926 | // |
| 927 | // |
| 928 | // Transform into frame in which initial parton is along z-axis |
| 929 | // |
| 930 | TVector3 v(px, py, pz); |
| 931 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); |
| 932 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); |
| 933 | |
| 934 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); |
| 935 | Double_t mt2 = jt * jt + m * m; |
| 936 | Double_t zmax = 1.; |
| 937 | // |
| 938 | // Kinematic limit on z |
| 939 | // |
| 940 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); |
| 941 | // |
| 942 | // Change light-cone kinematics rel. to initial parton |
| 943 | // |
| 944 | Double_t eppzOld = e + pl; |
| 945 | Double_t empzOld = e - pl; |
| 946 | |
| 947 | Double_t eppzNew = (1. - z) * eppzOld; |
| 948 | Double_t empzNew = empzOld - mt2 * z / eppzOld; |
| 949 | Double_t eNew = 0.5 * (eppzNew + empzNew); |
| 950 | Double_t plNew = 0.5 * (eppzNew - empzNew); |
| 951 | |
| 952 | Double_t jtNew; |
| 953 | // |
| 954 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 |
| 955 | Double_t mt2New = eppzNew * empzNew; |
| 956 | if (mt2New < 1.e-8) mt2New = 0.; |
| 957 | if (z < zmax) { |
| 958 | if (m * m > mt2New) { |
| 959 | // |
| 960 | // This should not happen |
| 961 | // |
| 962 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); |
| 963 | jtNew = 0; |
| 964 | } else { |
| 965 | jtNew = TMath::Sqrt(mt2New - m * m); |
| 966 | } |
| 967 | } else { |
| 968 | // If pT is to small (probably a leading massive particle) we scale only the energy |
| 969 | // This can cause negative masses of the radiated gluon |
| 970 | // Let's hope for the best ... |
| 971 | jtNew = jt; |
| 972 | eNew = TMath::Sqrt(plNew * plNew + mt2); |
| 973 | |
| 974 | } |
| 975 | // |
| 976 | // Calculate new px, py |
| 977 | // |
| 1044c4d8 |
978 | Double_t pxNew = 0; |
| 979 | Double_t pyNew = 0; |
| 980 | |
| 981 | if (jt > 0.) { |
| 982 | pxNew = jtNew / jt * pxs; |
| 983 | pyNew = jtNew / jt * pys; |
| 984 | } |
| 39d810c8 |
985 | |
| 986 | // Double_t dpx = pxs - pxNew; |
| 987 | // Double_t dpy = pys - pyNew; |
| 988 | // Double_t dpz = pl - plNew; |
| 989 | // Double_t de = e - eNew; |
| 990 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; |
| 991 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); |
| 992 | // printf("New mass (2) %e %e \n", pxNew, pyNew); |
| 993 | // |
| 994 | // Rotate back |
| 995 | // |
| 996 | TVector3 w(pxNew, pyNew, plNew); |
| 997 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); |
| 998 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); |
| 999 | |
| 1000 | p1[index][0] += pxNew; |
| 1001 | p1[index][1] += pyNew; |
| 1002 | p1[index][2] += plNew; |
| 1003 | p1[index][3] += eNew; |
| 1004 | // |
| 1005 | // Updated 4-momentum vectors |
| 1006 | // |
| 1007 | pNew[icount][0] = pxNew; |
| 1008 | pNew[icount][1] = pyNew; |
| 1009 | pNew[icount][2] = plNew; |
| 1010 | pNew[icount][3] = eNew; |
| 1011 | kNew[icount] = i; |
| 1012 | icount++; |
| 1013 | } // parton loop |
| 1014 | // |
| 1015 | // Check if there was phase-space for quenching |
| 1016 | // |
| 1017 | |
| 1018 | if (icount == 0) quenched[isys] = kFALSE; |
| 1019 | if (!quenched[isys]) break; |
| 1020 | |
| 1021 | for (Int_t j = 0; j < 4; j++) |
| 1022 | { |
| 1023 | p2[isys][j] = p0[isys][j] - p1[isys][j]; |
| 1024 | } |
| 1025 | 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]; |
| 1026 | if (p2[isys][4] > 0.) { |
| 1027 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); |
| 1028 | break; |
| 1029 | } else { |
| 1030 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); |
| 1031 | 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]); |
| 1032 | if (p2[isys][4] < -0.01) { |
| 1033 | printf("Negative mass squared !\n"); |
| 1034 | // Here we have to put the gluon back to mass shell |
| 1035 | // This will lead to a small energy imbalance |
| 1036 | p2[isys][4] = 0.; |
| 1037 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); |
| 1038 | break; |
| 1039 | } else { |
| 1040 | p2[isys][4] = 0.; |
| 1041 | break; |
| 1042 | } |
| 1043 | } |
| 1044 | /* |
| 1045 | zHeavy *= 0.98; |
| 1046 | printf("zHeavy lowered to %f\n", zHeavy); |
| 1047 | if (zHeavy < 0.01) { |
| 1048 | printf("No success ! \n"); |
| 1049 | icount = 0; |
| 1050 | quenched[isys] = kFALSE; |
| 1051 | break; |
| 1052 | } |
| 1053 | */ |
| 1054 | } // iteration on z (while) |
| 1055 | |
| 1056 | // Update event record |
| 1057 | for (Int_t k = 0; k < icount; k++) { |
| 1058 | // 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] ); |
| 1059 | fPyjets->P[0][kNew[k]] = pNew[k][0]; |
| 1060 | fPyjets->P[1][kNew[k]] = pNew[k][1]; |
| 1061 | fPyjets->P[2][kNew[k]] = pNew[k][2]; |
| 1062 | fPyjets->P[3][kNew[k]] = pNew[k][3]; |
| 1063 | } |
| 1064 | // |
| 1065 | // Add the gluons |
| 1066 | // |
| 1067 | Int_t ish = 0; |
| 1068 | Int_t iGlu; |
| 1069 | if (!quenched[isys]) continue; |
| 1070 | // |
| 1071 | // Last parton from shower i |
| 1072 | Int_t in = klast[isys]; |
| 1073 | // |
| 1074 | // Continue if no parton in shower i selected |
| 1075 | if (in == -1) continue; |
| 1076 | // |
| 1077 | // If this is the second initial parton and it is behind the first move pointer by previous ish |
| 1078 | if (isys == 1 && klast[1] > klast[0]) in += ish; |
| 1079 | // |
| 1080 | // Starting index |
| 1081 | |
| 1082 | // jmin = in - 1; |
| 1083 | // How many additional gluons will be generated |
| 1084 | ish = 1; |
| 1085 | if (p2[isys][4] > 0.05) ish = 2; |
| 1086 | // |
| 1087 | // Position of gluons |
| 1088 | iGlu = numpart; |
| 1089 | if (iglu == 0) igMin = iGlu; |
| 1090 | igMax = iGlu; |
| 1091 | numpart += ish; |
| 1092 | (fPyjets->N) += ish; |
| 1093 | |
| 1094 | if (ish == 1) { |
| 1095 | fPyjets->P[0][iGlu] = p2[isys][0]; |
| 1096 | fPyjets->P[1][iGlu] = p2[isys][1]; |
| 1097 | fPyjets->P[2][iGlu] = p2[isys][2]; |
| 1098 | fPyjets->P[3][iGlu] = p2[isys][3]; |
| 1099 | fPyjets->P[4][iGlu] = p2[isys][4]; |
| 1100 | |
| 1101 | fPyjets->K[0][iGlu] = 1; |
| 1102 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; |
| 1103 | fPyjets->K[1][iGlu] = 21; |
| 1104 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
| 1105 | fPyjets->K[3][iGlu] = -1; |
| 1106 | fPyjets->K[4][iGlu] = -1; |
| 1107 | |
| 1108 | pg[0] += p2[isys][0]; |
| 1109 | pg[1] += p2[isys][1]; |
| 1110 | pg[2] += p2[isys][2]; |
| 1111 | pg[3] += p2[isys][3]; |
| 1112 | } else { |
| 1113 | // |
| 1114 | // Split gluon in rest frame. |
| 1115 | // |
| 1116 | Double_t bx = p2[isys][0] / p2[isys][3]; |
| 1117 | Double_t by = p2[isys][1] / p2[isys][3]; |
| 1118 | Double_t bz = p2[isys][2] / p2[isys][3]; |
| 1119 | Double_t pst = p2[isys][4] / 2.; |
| 1120 | // |
| 1121 | // Isotropic decay ???? |
| 1122 | Double_t cost = 2. * gRandom->Rndm() - 1.; |
| 1123 | Double_t sint = TMath::Sqrt(1. - cost * cost); |
| 2ab330c9 |
1124 | Double_t phis = 2. * TMath::Pi() * gRandom->Rndm(); |
| 39d810c8 |
1125 | |
| 1126 | Double_t pz1 = pst * cost; |
| 1127 | Double_t pz2 = -pst * cost; |
| 1128 | Double_t pt1 = pst * sint; |
| 1129 | Double_t pt2 = -pst * sint; |
| 2ab330c9 |
1130 | Double_t px1 = pt1 * TMath::Cos(phis); |
| 1131 | Double_t py1 = pt1 * TMath::Sin(phis); |
| 1132 | Double_t px2 = pt2 * TMath::Cos(phis); |
| 1133 | Double_t py2 = pt2 * TMath::Sin(phis); |
| 39d810c8 |
1134 | |
| 1135 | fPyjets->P[0][iGlu] = px1; |
| 1136 | fPyjets->P[1][iGlu] = py1; |
| 1137 | fPyjets->P[2][iGlu] = pz1; |
| 1138 | fPyjets->P[3][iGlu] = pst; |
| 1139 | fPyjets->P[4][iGlu] = 0.; |
| 1140 | |
| 1141 | fPyjets->K[0][iGlu] = 1 ; |
| 1142 | fPyjets->K[1][iGlu] = 21; |
| 1143 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
| 1144 | fPyjets->K[3][iGlu] = -1; |
| 1145 | fPyjets->K[4][iGlu] = -1; |
| 1146 | |
| 1147 | fPyjets->P[0][iGlu+1] = px2; |
| 1148 | fPyjets->P[1][iGlu+1] = py2; |
| 1149 | fPyjets->P[2][iGlu+1] = pz2; |
| 1150 | fPyjets->P[3][iGlu+1] = pst; |
| 1151 | fPyjets->P[4][iGlu+1] = 0.; |
| 1152 | |
| 1153 | fPyjets->K[0][iGlu+1] = 1; |
| 1154 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; |
| 1155 | fPyjets->K[1][iGlu+1] = 21; |
| 1156 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; |
| 1157 | fPyjets->K[3][iGlu+1] = -1; |
| 1158 | fPyjets->K[4][iGlu+1] = -1; |
| 1159 | SetMSTU(1,0); |
| 1160 | SetMSTU(2,0); |
| 1161 | // |
| 1162 | // Boost back |
| 1163 | // |
| 1164 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); |
| 1165 | } |
| 1166 | /* |
| 1167 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { |
| 1168 | Double_t px, py, pz; |
| 1169 | px = fPyjets->P[0][ig]; |
| 1170 | py = fPyjets->P[1][ig]; |
| 1171 | pz = fPyjets->P[2][ig]; |
| 1172 | TVector3 v(px, py, pz); |
| 1173 | v.RotateZ(-phiq[isys]); |
| 1174 | v.RotateY(-thetaq[isys]); |
| 1175 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); |
| 1176 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); |
| 1177 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); |
| 1178 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); |
| 1179 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); |
| 1180 | pxs += jtKick * TMath::Cos(phiKick); |
| 1181 | pys += jtKick * TMath::Sin(phiKick); |
| 1182 | TVector3 w(pxs, pys, pzs); |
| 1183 | w.RotateY(thetaq[isys]); |
| 1184 | w.RotateZ(phiq[isys]); |
| 1185 | fPyjets->P[0][ig] = w.X(); |
| 1186 | fPyjets->P[1][ig] = w.Y(); |
| 1187 | fPyjets->P[2][ig] = w.Z(); |
| 1188 | fPyjets->P[2][ig] = w.Mag(); |
| 1189 | } |
| 1190 | */ |
| 1191 | } // kGluon |
| 1192 | |
| 1193 | |
| 1194 | // Check energy conservation |
| 1195 | Double_t pxs = 0.; |
| 1196 | Double_t pys = 0.; |
| 1197 | Double_t pzs = 0.; |
| 1198 | Double_t es = 14000.; |
| 1199 | |
| 1200 | for (Int_t i = 0; i < numpart; i++) |
| 1201 | { |
| 1202 | kst = fPyjets->K[0][i]; |
| 1203 | if (kst != 1 && kst != 2) continue; |
| 1204 | pxs += fPyjets->P[0][i]; |
| 1205 | pys += fPyjets->P[1][i]; |
| 1206 | pzs += fPyjets->P[2][i]; |
| 1207 | es -= fPyjets->P[3][i]; |
| 1208 | } |
| 1209 | if (TMath::Abs(pxs) > 1.e-2 || |
| 1210 | TMath::Abs(pys) > 1.e-2 || |
| 1211 | TMath::Abs(pzs) > 1.e-1) { |
| 1212 | printf("%e %e %e %e\n", pxs, pys, pzs, es); |
| 1213 | // Fatal("Quench()", "4-Momentum non-conservation"); |
| 1214 | } |
| 1215 | |
| 1216 | } // end quenching loop (systems) |
| 1217 | // Clean-up |
| 1218 | for (Int_t i = 0; i < numpart; i++) |
| 1219 | { |
| 1220 | imo = fPyjets->K[2][i]; |
| 1221 | if (imo > 1000) { |
| 1222 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; |
| 1223 | } |
| 1224 | } |
| 1225 | // this->Pylist(1); |
| 1226 | } // end quench |
| 1227 | |
| 1228 | |
| 1229 | void AliPythia6::Pyquen(Double_t a, Int_t ibf, Double_t b) |
| 1230 | { |
| 1231 | // Igor Lokthine's quenching routine |
| 1232 | // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt |
| 1233 | |
| 1234 | pyquen(a, ibf, b); |
| 1235 | } |
| 1236 | |
| 1237 | void AliPythia6::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl) |
| 1238 | { |
| 1239 | // Set the parameters for the PYQUEN package. |
| 1240 | // See comments in PyquenCommon.h |
| 1241 | |
| 1242 | |
| 1243 | PYQPAR.t0 = t0; |
| 1244 | PYQPAR.tau0 = tau0; |
| 1245 | PYQPAR.nf = nf; |
| 1246 | PYQPAR.iengl = iengl; |
| 1247 | PYQPAR.iangl = iangl; |
| 1248 | } |
| 1249 | |
| 1250 | void AliPythia6::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr) |
| 1251 | { |
| 1252 | // |
| 1253 | // Load event into Pythia Common Block |
| 1254 | // |
| 1255 | |
| 1256 | Int_t npart = stack -> GetNprimary(); |
| 1257 | Int_t n0 = 0; |
| 1258 | |
| 1259 | if (!flag) { |
| 1260 | GetPyjets()->N = npart; |
| 1261 | } else { |
| 1262 | n0 = GetPyjets()->N; |
| 1263 | GetPyjets()->N = n0 + npart; |
| 1264 | } |
| 1265 | |
| 1266 | |
| 1267 | for (Int_t part = 0; part < npart; part++) { |
| 1268 | TParticle *mPart = stack->Particle(part); |
| 1269 | |
| 1270 | Int_t kf = mPart->GetPdgCode(); |
| 1271 | Int_t ks = mPart->GetStatusCode(); |
| 1272 | Int_t idf = mPart->GetFirstDaughter(); |
| 1273 | Int_t idl = mPart->GetLastDaughter(); |
| 1274 | |
| 1275 | if (reHadr) { |
| 1276 | if (ks == 11 || ks == 12) { |
| 1277 | ks -= 10; |
| 1278 | idf = -1; |
| 1279 | idl = -1; |
| 1280 | } |
| 1281 | } |
| 1282 | |
| 1283 | Float_t px = mPart->Px(); |
| 1284 | Float_t py = mPart->Py(); |
| 1285 | Float_t pz = mPart->Pz(); |
| 1286 | Float_t e = mPart->Energy(); |
| 1287 | Float_t m = mPart->GetCalcMass(); |
| 1288 | |
| 1289 | |
| 1290 | (GetPyjets())->P[0][part+n0] = px; |
| 1291 | (GetPyjets())->P[1][part+n0] = py; |
| 1292 | (GetPyjets())->P[2][part+n0] = pz; |
| 1293 | (GetPyjets())->P[3][part+n0] = e; |
| 1294 | (GetPyjets())->P[4][part+n0] = m; |
| 1295 | |
| 1296 | (GetPyjets())->K[1][part+n0] = kf; |
| 1297 | (GetPyjets())->K[0][part+n0] = ks; |
| 1298 | (GetPyjets())->K[3][part+n0] = idf + 1; |
| 1299 | (GetPyjets())->K[4][part+n0] = idl + 1; |
| 1300 | (GetPyjets())->K[2][part+n0] = mPart->GetFirstMother() + 1; |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | |
| 1305 | void AliPythia6::Pyevnw() |
| 1306 | { |
| 1307 | // New multiple interaction scenario |
| 1308 | pyevnw(); |
| 1309 | } |
| 1310 | |
| 1311 | void AliPythia6::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) |
| 1312 | { |
| 1313 | // Return event specific quenching parameters |
| 1314 | xp = fXJet; |
| 1315 | yp = fYJet; |
| 1316 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; |
| 1317 | |
| 1318 | } |
| 1319 | |
| 1320 | void AliPythia6::ConfigHeavyFlavor() |
| 1321 | { |
| 1322 | // |
| 1323 | // Default configuration for Heavy Flavor production |
| 1324 | // |
| 1325 | // All QCD processes |
| 1326 | // |
| 1327 | SetMSEL(1); |
| 1328 | |
| 1329 | // No multiple interactions |
| 1330 | SetMSTP(81,0); |
| 1331 | SetPARP(81, 0.); |
| 1332 | SetPARP(82, 0.); |
| 1333 | // Initial/final parton shower on (Pythia default) |
| 1334 | SetMSTP(61,1); |
| 1335 | SetMSTP(71,1); |
| 1336 | |
| 1337 | // 2nd order alpha_s |
| 1338 | SetMSTP(2,2); |
| 1339 | |
| 1340 | // QCD scales |
| 1341 | SetMSTP(32,2); |
| 1342 | SetPARP(34,1.0); |
| 1343 | } |
| 1344 | |
| 1345 | void AliPythia6::AtlasTuning() |
| 1346 | { |
| 1347 | // |
| 1348 | // Configuration for the ATLAS tuning |
| 1349 | SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ5L)); |
| 1350 | SetMSTP(81,1); // Multiple Interactions ON |
| 1351 | SetMSTP(82,4); // Double Gaussian Model |
| 1352 | SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14) |
| 1353 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy |
| 1354 | SetPARP(89,1000.); // [GeV] Ref. energy |
| 1355 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) |
| 1356 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) |
| 1357 | SetPARP(84,0.5); // Core radius |
| 1358 | SetPARP(85,0.33); // Regulates gluon prod. mechanism |
| 1359 | SetPARP(86,0.66); // Regulates gluon prod. mechanism |
| 1360 | SetPARP(67,1); // Regulates Initial State Radiation |
| 1361 | } |
| 1362 | |
| 1363 | void AliPythia6::SetPtHardRange(Float_t ptmin, Float_t ptmax) |
| 1364 | { |
| 1365 | // Set the pt hard range |
| 1366 | SetCKIN(3, ptmin); |
| 1367 | SetCKIN(4, ptmax); |
| 1368 | } |
| 1369 | |
| 1370 | void AliPythia6::SetYHardRange(Float_t ymin, Float_t ymax) |
| 1371 | { |
| 1372 | // Set the y hard range |
| 1373 | SetCKIN(7, ymin); |
| 1374 | SetCKIN(8, ymax); |
| 1375 | } |
| 1376 | |
| 1377 | |
| 1378 | void AliPythia6::SetFragmentation(Int_t flag) |
| 1379 | { |
| 1380 | // Switch fragmentation on/off |
| 1381 | SetMSTP(111, flag); |
| 1382 | } |
| 1383 | |
| 1384 | void AliPythia6::SetInitialAndFinalStateRadiation(Int_t flag1, Int_t flag2) |
| 1385 | { |
| 1386 | // initial state radiation |
| 1387 | SetMSTP(61, flag1); |
| 1388 | // final state radiation |
| 1389 | SetMSTP(71, flag2); |
| 1390 | } |
| 1391 | |
| 1392 | void AliPythia6::SetIntrinsicKt(Float_t kt) |
| 1393 | { |
| 1394 | // Set the inreinsic kt |
| 1395 | if (kt > 0.) { |
| 1396 | SetMSTP(91,1); |
| 1397 | SetPARP(91,kt); |
| 1398 | SetPARP(93, 4. * kt); |
| 1399 | } else { |
| 1400 | SetMSTP(91,0); |
| 1401 | } |
| 1402 | } |
| 1403 | |
| 1404 | void AliPythia6::SwitchHFOff() |
| 1405 | { |
| 1406 | // Switch off heavy flavor |
| 1407 | // Maximum number of quark flavours used in pdf |
| 1408 | SetMSTP(58, 3); |
| 1409 | // Maximum number of flavors that can be used in showers |
| 1410 | SetMSTJ(45, 3); |
| 1411 | } |
| 1412 | |
| 1413 | void AliPythia6::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi, |
| 1414 | Float_t thresh, Float_t etseed, Float_t minet, Float_t r) |
| 1415 | { |
| 1416 | // Set pycell parameters |
| 1417 | SetPARU(51, etamax); |
| 1418 | SetMSTU(51, neta); |
| 1419 | SetMSTU(52, nphi); |
| 1420 | SetPARU(58, thresh); |
| 1421 | SetPARU(52, etseed); |
| 1422 | SetPARU(53, minet); |
| 1423 | SetPARU(54, r); |
| 1424 | SetMSTU(54, 2); |
| 1425 | } |
| 1426 | |
| 1427 | void AliPythia6::ModifiedSplitting() |
| 1428 | { |
| 1429 | // Modified splitting probability as a model for quenching |
| 1430 | SetPARJ(200, 0.8); |
| 1431 | SetMSTJ(41, 1); // QCD radiation only |
| 1432 | SetMSTJ(42, 2); // angular ordering |
| 1433 | SetMSTJ(44, 2); // option to run alpha_s |
| 1434 | SetMSTJ(47, 0); // No correction back to hard scattering element |
| 1435 | SetMSTJ(50, 0); // No coherence in first branching |
| 1436 | SetPARJ(82, 1.); // Cut off for parton showers |
| 1437 | } |
| 1438 | |
| 1439 | void AliPythia6::SwitchHadronisationOff() |
| 1440 | { |
| 1441 | // Switch off hadronisarion |
| 1442 | SetMSTJ(1, 0); |
| 1443 | } |
| 1444 | |
| 1445 | void AliPythia6::SwitchHadronisationOn() |
| 1446 | { |
| 1447 | // Switch on hadronisarion |
| 1448 | SetMSTJ(1, 1); |
| 1449 | } |
| 1450 | |
| 1451 | |
| 1452 | void AliPythia6::GetXandQ(Float_t& x1, Float_t& x2, Float_t& q) |
| 1453 | { |
| 1454 | // Get x1, x2 and Q for this event |
| 1455 | |
| 1456 | q = GetVINT(51); |
| 1457 | x1 = GetVINT(41); |
| 1458 | x2 = GetVINT(42); |
| 1459 | } |
| 1460 | |
| 1461 | Float_t AliPythia6::GetXSection() |
| 1462 | { |
| 1463 | // Get the total cross-section |
| 1464 | return (GetPARI(1)); |
| 1465 | } |
| 1466 | |
| 1467 | Float_t AliPythia6::GetPtHard() |
| 1468 | { |
| 1469 | // Get the pT hard for this event |
| 1470 | return GetVINT(47); |
| 1471 | } |
| 1472 | |
| 1473 | Int_t AliPythia6::ProcessCode() |
| 1474 | { |
| 1475 | // Get the subprocess code |
| 1476 | return GetMSTI(1); |
| 1477 | } |
| 1478 | |
| 1479 | void AliPythia6::PrintStatistics() |
| 1480 | { |
| 1481 | // End of run statistics |
| 1482 | Pystat(1); |
| 1483 | } |
| 1484 | |
| 1485 | void AliPythia6::EventListing() |
| 1486 | { |
| 1487 | // End of run statistics |
| 1488 | Pylist(2); |
| 1489 | } |
| 1490 | |
| 1491 | AliPythia6& AliPythia6::operator=(const AliPythia6& rhs) |
| 1492 | { |
| 1493 | // Assignment operator |
| 1494 | rhs.Copy(*this); |
| 1495 | return *this; |
| 1496 | } |
| 1497 | |
| 1498 | void AliPythia6::Copy(TObject&) const |
| 1499 | { |
| 1500 | // |
| 1501 | // Copy |
| 1502 | // |
| 1503 | Fatal("Copy","Not implemented!\n"); |
| 1504 | } |
git://git.uio.no / u / mrichter / AliRoot.git / blame