#include "AliPythia.h"
#include "AliPythiaRndm.h"
-#include "../FASTSIM/AliFastGlauber.h"
-#include "../FASTSIM/AliQuenchingWeights.h"
+#include "AliFastGlauber.h"
+#include "AliQuenchingWeights.h"
+#include "AliOmegaDalitz.h"
#include "TVector3.h"
+#include "TLorentzVector.h"
+#include "PyquenCommon.h"
ClassImp(AliPythia)
# define pycell pycell_
# define pyshow pyshow_
# define pyrobo pyrobo_
+# define pyquen pyquen_
+# define pyevnw pyevnw_
+# define pyshowq pyshowq_
+# define qpygin0 qpygin0_
+# define pytune pytune_
+# define py2ent py2ent_
# define type_of_call
#else
# define pyclus PYCLUS
# define pycell PYCELL
# define pyrobo PYROBO
+# define pyquen PYQUEN
+# define pyevnw PYEVNW
+# define pyshowq PYSHOWQ
+# define qpygin0 QPYGIN0
+# define pytune PYTUNE
+# define py2ent PY2ENT
# define type_of_call _stdcall
#endif
extern "C" void type_of_call pycell(Int_t & );
extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
-
+extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
+extern "C" void type_of_call pyevnw();
+extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
+extern "C" void type_of_call pytune(Int_t &);
+extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
+extern "C" void type_of_call qpygin0();
//_____________________________________________________________________________
AliPythia* AliPythia::fgAliPythia=NULL;
-AliPythia::AliPythia()
+AliPythia::AliPythia():
+ fProcess(kPyMb),
+ fEcms(0.),
+ fStrucFunc(kCTEQ5L),
+ fXJet(0.),
+ fYJet(0.),
+ fNGmax(30),
+ fZmax(0.97),
+ fGlauber(0),
+ fQuenchingWeights(0),
+ fItune(-1),
+ fOmegaDalitz()
{
// Default Constructor
//
AliPythiaRndm::SetPythiaRandom(GetRandom());
fGlauber = 0;
fQuenchingWeights = 0;
+ Int_t i = 0;
+ for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
+ for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
+ for (i = 0; i < 4; i++) fZQuench[i] = 0;
+}
+
+AliPythia::AliPythia(const AliPythia& pythia):
+ TPythia6(pythia),
+ AliRndm(pythia),
+ fProcess(kPyMb),
+ fEcms(0.),
+ fStrucFunc(kCTEQ5L),
+ fXJet(0.),
+ fYJet(0.),
+ fNGmax(30),
+ fZmax(0.97),
+ fGlauber(0),
+ fQuenchingWeights(0),
+ fItune(-1),
+ fOmegaDalitz()
+{
+ // Copy Constructor
+ Int_t i;
+ for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
+ for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
+ for (i = 0; i < 4; i++) fZQuench[i] = 0;
+ pythia.Copy(*this);
}
-void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
+void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
{
// Initialise the process to generate
if (!AliPythiaRndm::GetPythiaRandom())
AliPythiaRndm::SetPythiaRandom(GetRandom());
+ fItune = itune;
+
fProcess = process;
fEcms = energy;
fStrucFunc = strucfunc;
-// don't decay p0
- SetMDCY(Pycomp(111),1,0);
-// select structure function
+//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
+ SetMDCY(Pycomp(111) ,1,0); // pi0
+ SetMDCY(Pycomp(310) ,1,0); // K0S
+ SetMDCY(Pycomp(3122),1,0); // kLambda
+ SetMDCY(Pycomp(3112),1,0); // sigma -
+ SetMDCY(Pycomp(3222),1,0); // sigma +
+ SetMDCY(Pycomp(3312),1,0); // xi -
+ SetMDCY(Pycomp(3322),1,0); // xi 0
+ SetMDCY(Pycomp(3334),1,0); // omega-
+ // Select structure function
SetMSTP(52,2);
- SetMSTP(51,strucfunc);
+ SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
+ // Particles produced in string fragmentation point directly to either of the two endpoints
+ // of the string (depending in the side they were generated from).
+ SetMSTU(16,2);
+
//
// Pythia initialisation for selected processes//
//
// select charm production
switch (process)
{
+ case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
+// Multiple interactions on.
+ SetMSTP(81,1);
+// Double Gaussian matter distribution.
+ SetMSTP(82,4);
+ SetPARP(83,0.5);
+ SetPARP(84,0.4);
+// pT0.
+ SetPARP(82,2.0);
+// Reference energy for pT0 and energy rescaling pace.
+ SetPARP(89,1800);
+ SetPARP(90,0.25);
+// String drawing almost completely minimizes string length.
+ SetPARP(85,0.9);
+ SetPARP(86,0.95);
+// ISR and FSR activity.
+ SetPARP(67,4);
+ SetPARP(71,4);
+// Lambda_FSR scale.
+ SetPARJ(81,0.29);
+ break;
+ case kPyOldUEQ2ordered2:
+// Old underlying events with Q2 ordered QCD processes
+// Multiple interactions on.
+ SetMSTP(81,1);
+// Double Gaussian matter distribution.
+ SetMSTP(82,4);
+ SetPARP(83,0.5);
+ SetPARP(84,0.4);
+// pT0.
+ SetPARP(82,2.0);
+// Reference energy for pT0 and energy rescaling pace.
+ SetPARP(89,1800);
+ SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
+// String drawing almost completely minimizes string length.
+ SetPARP(85,0.9);
+ SetPARP(86,0.95);
+// ISR and FSR activity.
+ SetPARP(67,4);
+ SetPARP(71,4);
+// Lambda_FSR scale.
+ SetPARJ(81,0.29);
+ break;
+ case kPyOldPopcorn:
+// Old production mechanism: Old Popcorn
+ SetMSEL(1);
+ SetMSTJ(12,3);
+// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
+ SetMSTP(88,2);
+// (D=1)see can be used to form baryons (BARYON JUNCTION)
+ SetMSTJ(1,1);
+ AtlasTuning();
+ break;
case kPyCharm:
SetMSEL(4);
-//
// heavy quark masses
SetPMAS(4,1,1.2);
- SetMSTU(16,2);
//
// primordial pT
SetMSTP(91,1);
case kPyBeauty:
SetMSEL(5);
SetPMAS(5,1,4.75);
- SetMSTU(16,2);
break;
case kPyJpsi:
SetMSEL(0);
SetMSUB(94,1); // double diffraction
SetMSUB(95,1); // low pt production
+ AtlasTuning();
+ break;
+
+ case kPyMbAtlasTuneMC09:
+// Minimum Bias pp-Collisions
//
-// ATLAS Tuning
+//
+// select Pythia min. bias model
+ SetMSEL(0);
+ SetMSUB(92,1); // single diffraction AB-->XB
+ SetMSUB(93,1); // single diffraction AB-->AX
+ SetMSUB(94,1); // double diffraction
+ SetMSUB(95,1); // low pt production
+
+ AtlasTuning_MC09();
+ break;
+
+ case kPyMbWithDirectPhoton:
+// Minimum Bias pp-Collisions with direct photon processes added
//
- SetMSTP(51,7); // CTEQ5L pdf
- SetMSTP(81,1); // Multiple Interactions ON
- SetMSTP(82,4); // Double Gaussian Model
+//
+// select Pythia min. bias model
+ SetMSEL(0);
+ SetMSUB(92,1); // single diffraction AB-->XB
+ SetMSUB(93,1); // single diffraction AB-->AX
+ SetMSUB(94,1); // double diffraction
+ SetMSUB(95,1); // low pt production
- SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
- SetPARP(89,1000.); // [GeV] Ref. energy
- SetPARP(90,0.16); // 2*epsilon (exponent in power law)
- SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
- SetPARP(84,0.5); // Core radius
- SetPARP(85,0.33); // Regulates gluon prod. mechanism
- SetPARP(86,0.66); // Regulates gluon prod. mechanism
- SetPARP(67,1); // Regulates Initial State Radiation
+ SetMSUB(14,1); //
+ SetMSUB(18,1); //
+ SetMSUB(29,1); //
+ SetMSUB(114,1); //
+ SetMSUB(115,1); //
+
+
+ AtlasTuning();
break;
- case kPyMbNonDiffr:
+
+ case kPyMbDefault:
// Minimum Bias pp-Collisions
//
//
// select Pythia min. bias model
SetMSEL(0);
+ SetMSUB(92,1); // single diffraction AB-->XB
+ SetMSUB(93,1); // single diffraction AB-->AX
+ SetMSUB(94,1); // double diffraction
+ SetMSUB(95,1); // low pt production
+ break;
+ case kPyLhwgMb:
+// Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
+// -> Pythia 6.3 or above is needed
+//
+ SetMSEL(0);
+ SetMSUB(92,1); // single diffraction AB-->XB
+ SetMSUB(93,1); // single diffraction AB-->AX
+ SetMSUB(94,1); // double diffraction
SetMSUB(95,1); // low pt production
-//
-// ATLAS Tuning
-//
-
- SetMSTP(51,7); // CTEQ5L pdf
+ SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
+ SetMSTP(52,2);
+ SetMSTP(68,1);
+ SetMSTP(70,2);
SetMSTP(81,1); // Multiple Interactions ON
SetMSTP(82,4); // Double Gaussian Model
+ SetMSTP(88,1);
- SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
- SetPARP(89,1000.); // [GeV] Ref. energy
- SetPARP(90,0.16); // 2*epsilon (exponent in power law)
+ SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
SetPARP(84,0.5); // Core radius
- SetPARP(85,0.33); // Regulates gluon prod. mechanism
- SetPARP(86,0.66); // Regulates gluon prod. mechanism
- SetPARP(67,1); // Regulates Initial State Radiation
+ SetPARP(85,0.9); // Regulates gluon prod. mechanism
+ SetPARP(90,0.2); // 2*epsilon (exponent in power law)
+
+ break;
+ case kPyMbNonDiffr:
+// Minimum Bias pp-Collisions
+//
+//
+// select Pythia min. bias model
+ SetMSEL(0);
+ SetMSUB(95,1); // low pt production
+
+ AtlasTuning();
+ break;
+ case kPyMbMSEL1:
+ ConfigHeavyFlavor();
+// Intrinsic <kT^2>
+ SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
+ SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
+ SetPARP(93,5.); // Upper cut-off
+// Set Q-quark mass
+ SetPMAS(4,1,1.2); // Charm quark mass
+ SetPMAS(5,1,4.78); // Beauty quark mass
+ SetPARP(71,4.); // Defaut value
+// Atlas Tuning
+ AtlasTuning();
break;
case kPyJets:
//
// QCD Jets
//
SetMSEL(1);
- break;
+ // Pythia Tune A (CDF)
+ //
+ SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
+ SetMSTP(82,4); // Double Gaussian Model
+ SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
+ SetPARP(84,0.4); // Core radius
+ SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
+ SetPARP(86,0.95); // Regulates gluon prod. mechanism
+ SetPARP(89,1800.); // [GeV] Ref. energy
+ SetPARP(90,0.25); // 2*epsilon (exponent in power law)
+ break;
case kPyDirectGamma:
SetMSEL(10);
break;
case kPyCharmPbPbMNR:
case kPyD0PbPbMNR:
- // Tuning of Pythia parameters aimed to get a resonable agreement
- // between with the NLO calculation by Mangano, Nason, Ridolfi for the
- // c-cbar single inclusive and double differential distributions.
- // This parameter settings are meant to work with Pb-Pb collisions
- // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
- // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
- // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
- // QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
-
- // Intrinsic <kT>
- SetMSTP(91,1);
- SetPARP(91,1.304);
- SetPARP(93,6.52);
-
- // Set c-quark mass
- SetPMAS(4,1,1.2);
-
- break;
case kPyDPlusPbPbMNR:
+ case kPyDPlusStrangePbPbMNR:
// Tuning of Pythia parameters aimed to get a resonable agreement
// between with the NLO calculation by Mangano, Nason, Ridolfi for the
// c-cbar single inclusive and double differential distributions.
// (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
// To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
// has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
- // QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
-
+ ConfigHeavyFlavor();
// Intrinsic <kT>
SetMSTP(91,1);
SetPARP(91,1.304);
SetPARP(93,6.52);
-
// Set c-quark mass
SetPMAS(4,1,1.2);
-
break;
case kPyCharmpPbMNR:
case kPyD0pPbMNR:
- // Tuning of Pythia parameters aimed to get a resonable agreement
- // between with the NLO calculation by Mangano, Nason, Ridolfi for the
- // c-cbar single inclusive and double differential distributions.
- // This parameter settings are meant to work with p-Pb collisions
- // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
- // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
- // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
- // QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
-
- // Intrinsic <kT>
- SetMSTP(91,1);
- SetPARP(91,1.16);
- SetPARP(93,5.8);
-
- // Set c-quark mass
- SetPMAS(4,1,1.2);
-
- break;
case kPyDPluspPbMNR:
+ case kPyDPlusStrangepPbMNR:
// Tuning of Pythia parameters aimed to get a resonable agreement
// between with the NLO calculation by Mangano, Nason, Ridolfi for the
// c-cbar single inclusive and double differential distributions.
// (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
// To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
// has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
- // QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
-
+ ConfigHeavyFlavor();
// Intrinsic <kT>
- SetMSTP(91,1);
- SetPARP(91,1.16);
- SetPARP(93,5.8);
-
+ SetMSTP(91,1);
+ SetPARP(91,1.16);
+ SetPARP(93,5.8);
+
// Set c-quark mass
- SetPMAS(4,1,1.2);
-
+ SetPMAS(4,1,1.2);
break;
case kPyCharmppMNR:
case kPyD0ppMNR:
+ case kPyDPlusppMNR:
+ case kPyDPlusStrangeppMNR:
+ case kPyLambdacppMNR:
// Tuning of Pythia parameters aimed to get a resonable agreement
// between with the NLO calculation by Mangano, Nason, Ridolfi for the
// c-cbar single inclusive and double differential distributions.
// (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
// To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
// has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
- // QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
-
+ ConfigHeavyFlavor();
// Intrinsic <kT^2>
- SetMSTP(91,1);
- SetPARP(91,1.);
- SetPARP(93,5.);
-
+ SetMSTP(91,1);
+ SetPARP(91,1.);
+ SetPARP(93,5.);
+
// Set c-quark mass
- SetPMAS(4,1,1.2);
-
+ SetPMAS(4,1,1.2);
break;
- case kPyDPlusppMNR:
+ case kPyCharmppMNRwmi:
// Tuning of Pythia parameters aimed to get a resonable agreement
// between with the NLO calculation by Mangano, Nason, Ridolfi for the
// c-cbar single inclusive and double differential distributions.
// This parameter settings are meant to work with pp collisions
- // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
- // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
- // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
- // QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
-
+ // and with kCTEQ5L PDFs.
+ // Added multiple interactions according to ATLAS tune settings.
+ // To get a "reasonable" agreement with MNR results, events have to be
+ // generated with the minimum ptHard (AliGenPythia::SetPtHard)
+ // set to 2.76 GeV.
+ // To get a "perfect" agreement with MNR results, events have to be
+ // generated in four ptHard bins with the following relative
+ // normalizations:
+ // 2.76-3 GeV: 25%
+ // 3-4 GeV: 40%
+ // 4-8 GeV: 29%
+ // >8 GeV: 6%
+ ConfigHeavyFlavor();
// Intrinsic <kT^2>
- SetMSTP(91,1);
- SetPARP(91,1.);
- SetPARP(93,5.);
+ SetMSTP(91,1);
+ SetPARP(91,1.);
+ SetPARP(93,5.);
// Set c-quark mass
- SetPMAS(4,1,1.2);
-
- break;
+ SetPMAS(4,1,1.2);
+ AtlasTuning();
+ break;
case kPyBeautyPbPbMNR:
// Tuning of Pythia parameters aimed to get a resonable agreement
// between with the NLO calculation by Mangano, Nason, Ridolfi for the
// (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
// To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
// has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
+ ConfigHeavyFlavor();
// QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
- SetPARP(67,1.0);
- SetPARP(71,1.0);
-
+ SetPARP(67,1.0);
+ SetPARP(71,1.0);
// Intrinsic <kT>
- SetMSTP(91,1);
- SetPARP(91,2.035);
- SetPARP(93,10.17);
-
+ SetMSTP(91,1);
+ SetPARP(91,2.035);
+ SetPARP(93,10.17);
// Set b-quark mass
- SetPMAS(5,1,4.75);
-
+ SetPMAS(5,1,4.75);
break;
case kPyBeautypPbMNR:
// Tuning of Pythia parameters aimed to get a resonable agreement
// (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
// To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
// has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
+ ConfigHeavyFlavor();
// QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
- SetPARP(67,1.0);
- SetPARP(71,1.0);
-
+ SetPARP(67,1.0);
+ SetPARP(71,1.0);
// Intrinsic <kT>
- SetMSTP(91,1);
- SetPARP(91,1.60);
- SetPARP(93,8.00);
-
+ SetMSTP(91,1);
+ SetPARP(91,1.60);
+ SetPARP(93,8.00);
// Set b-quark mass
- SetPMAS(5,1,4.75);
-
+ SetPMAS(5,1,4.75);
break;
case kPyBeautyppMNR:
// Tuning of Pythia parameters aimed to get a resonable agreement
// (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
// To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
// has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
-
- // All QCD processes
- SetMSEL(1);
-
- // No multiple interactions
- SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
- // Initial/final parton shower on (Pythia default)
- SetMSTP(61,1);
- SetMSTP(71,1);
-
- // 2nd order alpha_s
- SetMSTP(2,2);
-
+ ConfigHeavyFlavor();
// QCD scales
- SetMSTP(32,2);
- SetPARP(34,1.0);
- SetPARP(67,1.0);
- SetPARP(71,1.0);
-
- // Intrinsic <kT>
- SetMSTP(91,1);
- SetPARP(91,1.);
- SetPARP(93,5.);
+ SetPARP(67,1.0);
+ SetPARP(71,1.0);
+
+ // Intrinsic <kT>
+ SetMSTP(91,1);
+ SetPARP(91,1.);
+ SetPARP(93,5.);
+
+ // Set b-quark mass
+ SetPMAS(5,1,4.75);
+ break;
+ case kPyBeautyJets:
+ case kPyBeautyppMNRwmi:
+ // Tuning of Pythia parameters aimed to get a resonable agreement
+ // between with the NLO calculation by Mangano, Nason, Ridolfi for the
+ // b-bbar single inclusive and double differential distributions.
+ // This parameter settings are meant to work with pp collisions
+ // and with kCTEQ5L PDFs.
+ // Added multiple interactions according to ATLAS tune settings.
+ // To get a "reasonable" agreement with MNR results, events have to be
+ // generated with the minimum ptHard (AliGenPythia::SetPtHard)
+ // set to 2.76 GeV.
+ // To get a "perfect" agreement with MNR results, events have to be
+ // generated in four ptHard bins with the following relative
+ // normalizations:
+ // 2.76-4 GeV: 5%
+ // 4-6 GeV: 31%
+ // 6-8 GeV: 28%
+ // >8 GeV: 36%
+ ConfigHeavyFlavor();
+ // QCD scales
+ SetPARP(67,1.0);
+ SetPARP(71,1.0);
+
+ // Intrinsic <kT>
+ SetMSTP(91,1);
+ SetPARP(91,1.);
+ SetPARP(93,5.);
// Set b-quark mass
- SetPMAS(5,1,4.75);
+ SetPMAS(5,1,4.75);
+
+ AtlasTuning();
+ break;
+ case kPyW:
+
+ //Inclusive production of W+/-
+ SetMSEL(0);
+ //f fbar -> W+
+ SetMSUB(2,1);
+ // //f fbar -> g W+
+ // SetMSUB(16,1);
+ // //f fbar -> gamma W+
+ // SetMSUB(20,1);
+ // //f g -> f W+
+ // SetMSUB(31,1);
+ // //f gamma -> f W+
+ // SetMSUB(36,1);
+
+ // Initial/final parton shower on (Pythia default)
+ // With parton showers on we are generating "W inclusive process"
+ SetMSTP(61,1); //Initial QCD & QED showers on
+ SetMSTP(71,1); //Final QCD & QED showers on
+
+ break;
+
+ case kPyZ:
+
+ //Inclusive production of Z
+ SetMSEL(0);
+ //f fbar -> Z/gamma
+ SetMSUB(1,1);
+
+ // // f fbar -> g Z/gamma
+ // SetMSUB(15,1);
+ // // f fbar -> gamma Z/gamma
+ // SetMSUB(19,1);
+ // // f g -> f Z/gamma
+ // SetMSUB(30,1);
+ // // f gamma -> f Z/gamma
+ // SetMSUB(35,1);
+
+ //only Z included, not gamma
+ SetMSTP(43,2);
+
+ // Initial/final parton shower on (Pythia default)
+ // With parton showers on we are generating "Z inclusive process"
+ SetMSTP(61,1); //Initial QCD & QED showers on
+ SetMSTP(71,1); //Final QCD & QED showers on
+
+ break;
- break;
}
//
// Initialize PYTHIA
+//
+// Select the tune
+ if (itune > -1) Pytune(itune);
+
+//
SetMSTP(41,1); // all resonance decays switched on
-
Initialize("CMS","p","p",fEcms);
-
+ fOmegaDalitz.Init();
}
Int_t AliPythia::CheckedLuComp(Int_t kf)
return kc;
}
-void AliPythia::SetNuclei(Int_t a1, Int_t a2)
+void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
{
// Treat protons as inside nuclei with mass numbers a1 and a2
// The MSTP array in the PYPARS common block is used to enable and
// If the following mass number both not equal zero, nuclear corrections of the stf are used.
// MSTP(192) : Mass number of nucleus side 1
// MSTP(193) : Mass number of nucleus side 2
+// MSTP(194) : Nuclear structure function: 0: EKS98 1:EPS08
SetMSTP(52,2);
SetMSTP(192, a1);
- SetMSTP(193, a2);
+ SetMSTP(193, a2);
+ SetMSTP(194, pdf);
}
pyrobo(imi, ima, the, phi, bex, bey, bez);
}
+void AliPythia::Pytune(Int_t itune)
+{
+/*
+C
+C ITUNE NAME (detailed descriptions below)
+C 0 Default : No settings changed => linked Pythia version's defaults.
+C ====== Old UE, Q2-ordered showers ==========================================
+C 100 A : Rick Field's CDF Tune A
+C 101 AW : Rick Field's CDF Tune AW
+C 102 BW : Rick Field's CDF Tune BW
+C 103 DW : Rick Field's CDF Tune DW
+C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
+C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
+C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
+C 107 ACR : Tune A modified with annealing CR
+C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
+C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
+C ====== Intermediate Models =================================================
+C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
+C 201 APT : Tune A modified to use pT-ordered final-state showers
+C ====== New UE, interleaved pT-ordered showers, annealing CR ================
+C 300 S0 : Sandhoff-Skands Tune 0
+C 301 S1 : Sandhoff-Skands Tune 1
+C 302 S2 : Sandhoff-Skands Tune 2
+C 303 S0A : S0 with "Tune A" UE energy scaling
+C 304 NOCR : New UE "best try" without colour reconnections
+C 305 Old : New UE, original (primitive) colour reconnections
+C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
+C ======= The Uppsala models =================================================
+C ( NB! must be run with special modified Pythia 6.215 version )
+C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
+C 400 GAL 0 : Generalized area-law model. Old parameters
+C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
+C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
+*/
+ pytune(itune);
+}
+void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
+ // Inset 2-parton system at line idx
+ py2ent(idx, pdg1, pdg2, p);
+}
-void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t qTransport, Float_t maxLength, Int_t iECMethod)
+
+void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
{
// Initializes
// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
// (2) The nuclear geometry using the Glauber Model
//
-
-
- fGlauber = new AliFastGlauber();
+
+ fGlauber = AliFastGlauber::Instance();
fGlauber->Init(2);
fGlauber->SetCentralityClass(cMin, cMax);
fQuenchingWeights = new AliQuenchingWeights();
fQuenchingWeights->InitMult();
- fQuenchingWeights->SetQTransport(qTransport);
+ fQuenchingWeights->SetK(k);
fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
- fQuenchingWeights->SetLengthMax(Int_t(maxLength));
- fQuenchingWeights->SampleEnergyLoss();
+ fNGmax = ngmax;
+ fZmax = zmax;
}
static Float_t eMean = 0.;
static Int_t icall = 0;
- Double_t p0[2][5];
- Double_t p1[2][5];
- Double_t p2[2][5];
- Int_t klast[2] = {-1, -1};
+ Double_t p0[4][5];
+ Double_t p1[4][5];
+ Double_t p2[4][5];
+ Int_t klast[4] = {-1, -1, -1, -1};
Int_t numpart = fPyjets->N;
- Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0.;
- Double_t pxq[2], pyq[2], pzq[2], eq[2], yq[2], mq[2], pq[2], phiq[2], thetaq[2], ptq[2];
- Bool_t quenched[2];
- Double_t phi;
- Double_t zInitial[2], wjtKick[2];
- Int_t nGluon[2];
-
+ Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
+ Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
+ Bool_t quenched[4];
+ Double_t wjtKick[4] = {0., 0., 0., 0.};
+ Int_t nGluon[4];
+ Int_t qPdg[4];
Int_t imo, kst, pdg;
+
//
-// Primary partons
+// Sore information about Primary partons
+//
+// j =
+// 0, 1 partons from hard scattering
+// 2, 3 partons from initial state radiation
+//
+ for (Int_t i = 2; i <= 7; i++) {
+ Int_t j = 0;
+ // Skip gluons that participate in hard scattering
+ if (i == 4 || i == 5) continue;
+ // Gluons from hard Scattering
+ if (i == 6 || i == 7) {
+ j = i - 6;
+ pxq[j] = fPyjets->P[0][i];
+ pyq[j] = fPyjets->P[1][i];
+ pzq[j] = fPyjets->P[2][i];
+ eq[j] = fPyjets->P[3][i];
+ mq[j] = fPyjets->P[4][i];
+ } else {
+ // Gluons from initial state radiation
+ //
+ // Obtain 4-momentum vector from difference between original parton and parton after gluon
+ // radiation. Energy is calculated independently because initial state radition does not
+ // conserve strictly momentum and energy for each partonic system independently.
+ //
+ // Not very clean. Should be improved !
+ //
+ //
+ j = i;
+ pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
+ pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
+ pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
+ mq[j] = fPyjets->P[4][i];
+ eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
+ }
+//
+// Calculate some kinematic variables
//
-
-
-
- for (Int_t i = 6; i <= 7; i++) {
- Int_t j = i - 6;
-
- pxq[j] = fPyjets->P[0][i];
- pyq[j] = fPyjets->P[1][i];
- pzq[j] = fPyjets->P[2][i];
- eq[j] = fPyjets->P[3][i];
- mq[j] = fPyjets->P[4][i];
yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
- phi = phiq[j];
-
- // Quench only central jets
- if (TMath::Abs(yq[j]) > 2.5) {
- zInitial[j] = 0.;
+ qPdg[j] = fPyjets->K[1][i];
+ }
+
+ Double_t int0[4];
+ Double_t int1[4];
+
+ fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
+
+ for (Int_t j = 0; j < 4; j++) {
+ //
+ // Quench only central jets and with E > 10.
+ //
+
+
+ Int_t itype = (qPdg[j] == 21) ? 2 : 1;
+ Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
+
+ if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
+ fZQuench[j] = 0.;
} else {
- pdg = fPyjets->K[1][i];
-
- // Get length in nucleus
- Double_t l;
- fGlauber->GetLengthsForPythia(1, &phi, &l, -1.);
- //
- // Energy loss for given length and parton typr
- Int_t itype = (pdg == 21) ? 2 : 1;
-
- Double_t eloss = fQuenchingWeights->GetELossRandom(itype, l, eq[j]);
- if (eq[j] > 80. && TMath::Abs(yq[j]) < 0.5) {
+ if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
icall ++;
eMean += eloss;
}
-
//
// Extra pt
-
- wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->GetQTransport());
+ Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
+ wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
//
// Fractional energy loss
- zInitial[j] = eloss / eq[j];
+ fZQuench[j] = eloss / eq[j];
//
// Avoid complete loss
//
- if (zInitial[j] == 1.) zInitial[j] = 0.95;
+ if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
//
// Some debug printing
- 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",
- j, itype, eq[j], phi, l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
+
+
+// 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",
+// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
- zInitial[j] = 1.;
- while (zInitial[j] >= 0.95) zInitial[j] = gRandom->Exp(0.2);
+// fZQuench[j] = 0.8;
+// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
}
- quenched[j] = (zInitial[j] > 0.01);
+ quenched[j] = (fZQuench[j] > 0.01);
} // primary partons
-
+
+
+
Double_t pNew[1000][4];
Int_t kNew[1000];
Int_t icount = 0;
+ Double_t zquench[4];
+
//
// System Loop
- for (Int_t isys = 0; isys < 2; isys++) {
+ for (Int_t isys = 0; isys < 4; isys++) {
// Skip to next system if not quenched.
if (!quenched[isys]) continue;
- nGluon[isys] = 1 + Int_t(zInitial[isys] / (1. - zInitial[isys]));
- if (nGluon[isys] > 6) nGluon[isys] = 6;
- zInitial[isys] = 1. - TMath::Power(1. - zInitial[isys], 1./Double_t(nGluon[isys]));
+ nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
+ if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
+ zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
// Loop on radiation events
for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
- Double_t zHeavy = zInitial[isys];
-//
-
while (1) {
icount = 0;
for (Int_t k = 0; k < 4; k++)
// Quarks and gluons only
if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
// Particles from hard scattering only
+
if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
- if (imo != (isys + 7) && (imo % 1000) != (isys + 7)) continue;
+ Int_t imom = imo % 1000;
+ if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
+ if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
+
// Skip comment lines
if (kst != 1 && kst != 2) continue;
theta = TMath::ATan2(pt, pz);
//
-// Save 4-momentum sum for balancing
- Int_t index = imo - 7;
- if (index >= 1000) index = imo % 1000 - 7;
+// Save 4-momentum sum for balancing
+ Int_t index = isys;
p0[index][0] += px;
p0[index][1] += py;
//
// Fractional energy loss
- Double_t z = zInitial[index];
+ Double_t z = zquench[index];
+
// Don't fully quench radiated gluons
//
// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
//
- z = 0.05;
+ z = 0.02;
}
+// printf("z: %d %f\n", imo, z);
+
//
-
- if (m > 0.) z = zHeavy;
//
//
//
// Calculate new px, py
//
- Double_t pxNew = jtNew / jt * pxs;
- Double_t pyNew = jtNew / jt * pys;
+ Double_t pxNew = 0;
+ Double_t pyNew = 0;
+ if (jt>0) {
+ pxNew = jtNew / jt * pxs;
+ pyNew = jtNew / jt * pys;
+ }
// Double_t dpx = pxs - pxNew;
// Double_t dpy = pys - pyNew;
// Double_t dpz = pl - plNew;
p2[isys][4] = TMath::Sqrt(p2[isys][4]);
break;
} else {
- printf("Warning negative mass squared in system %d %f ! \n", isys, zInitial[isys]);
+ printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
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]);
if (p2[isys][4] < -0.01) {
printf("Negative mass squared !\n");
//
// Isotropic decay ????
Double_t cost = 2. * gRandom->Rndm() - 1.;
- Double_t sint = TMath::Sqrt(1. - cost * cost);
- Double_t phi = 2. * TMath::Pi() * gRandom->Rndm();
+ Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
+ Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
Double_t pz1 = pst * cost;
Double_t pz2 = -pst * cost;
Double_t pt1 = pst * sint;
Double_t pt2 = -pst * sint;
- Double_t px1 = pt1 * TMath::Cos(phi);
- Double_t py1 = pt1 * TMath::Sin(phi);
- Double_t px2 = pt2 * TMath::Cos(phi);
- Double_t py2 = pt2 * TMath::Sin(phi);
+ Double_t px1 = pt1 * TMath::Cos(phis);
+ Double_t py1 = pt1 * TMath::Sin(phis);
+ Double_t px2 = pt2 * TMath::Cos(phis);
+ Double_t py2 = pt2 * TMath::Sin(phis);
fPyjets->P[0][iGlu] = px1;
fPyjets->P[1][iGlu] = py1;
// this->Pylist(1);
} // end quench
+
+void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
+{
+ // Igor Lokthine's quenching routine
+ // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
+
+ pyquen(a, ibf, b);
+}
+
+void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
+{
+ // Set the parameters for the PYQUEN package.
+ // See comments in PyquenCommon.h
+
+
+ PYQPAR.t0 = t0;
+ PYQPAR.tau0 = tau0;
+ PYQPAR.nf = nf;
+ PYQPAR.iengl = iengl;
+ PYQPAR.iangl = iangl;
+}
+
+
+void AliPythia::Pyevnw()
+{
+ // New multiple interaction scenario
+ pyevnw();
+}
+
+void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
+{
+ // Call medium-modified Pythia jet reconstruction algorithm
+ //
+ pyshowq(ip1, ip2, qmax);
+}
+ void AliPythia::Qpygin0()
+ {
+ // New multiple interaction scenario
+ qpygin0();
+ }
+
+void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
+{
+ // Return event specific quenching parameters
+ xp = fXJet;
+ yp = fYJet;
+ for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
+
+}
+
+void AliPythia::ConfigHeavyFlavor()
+{
+ //
+ // Default configuration for Heavy Flavor production
+ //
+ // All QCD processes
+ //
+ SetMSEL(1);
+
+
+ if (fItune < 0) {
+ // No multiple interactions
+ SetMSTP(81,0);
+ SetPARP(81, 0.);
+ SetPARP(82, 0.);
+ }
+ // Initial/final parton shower on (Pythia default)
+ SetMSTP(61,1);
+ SetMSTP(71,1);
+
+ // 2nd order alpha_s
+ SetMSTP(2,2);
+
+ // QCD scales
+ SetMSTP(32,2);
+ SetPARP(34,1.0);
+}
+
+void AliPythia::AtlasTuning()
+{
+ //
+ // Configuration for the ATLAS tuning
+ if (fItune > -1) return;
+ printf("ATLAS TUNE \n");
+
+ SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
+ SetMSTP(81,1); // Multiple Interactions ON
+ SetMSTP(82,4); // Double Gaussian Model
+ SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
+ SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
+ SetPARP(89,1000.); // [GeV] Ref. energy
+ SetPARP(90,0.16); // 2*epsilon (exponent in power law)
+ SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
+ SetPARP(84,0.5); // Core radius
+ SetPARP(85,0.33); // Regulates gluon prod. mechanism
+ SetPARP(86,0.66); // Regulates gluon prod. mechanism
+ SetPARP(67,1); // Regulates Initial State Radiation
+}
+
+void AliPythia::AtlasTuning_MC09()
+{
+ //
+ // Configuration for the ATLAS tuning
+ if (fItune > -1) return;
+ printf("ATLAS New TUNE MC09\n");
+ SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
+ SetMSTP(82, 4); // Double Gaussian Model
+ SetMSTP(52, 2); // External PDF
+ SetMSTP(51, 20650); // MRST LO*
+
+
+ SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
+ SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
+ SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
+ SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
+
+ SetPARP(78, 0.3); // the amount of color reconnection in the final state
+ SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
+ SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
+ SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
+ SetPARP(84, 0.7); // Core radius
+ SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
+ SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
+
+ SetMSTP(95, 6);
+ SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
+ SetPARJ(42, 0.58);
+ SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
+ SetPARP(89,1800.); // [GeV] Ref. energy
+}
+
+AliPythia& AliPythia::operator=(const AliPythia& rhs)
+{
+// Assignment operator
+ rhs.Copy(*this);
+ return *this;
+}
+
+ void AliPythia::Copy(TObject&) const
+{
+ //
+ // Copy
+ //
+ Fatal("Copy","Not implemented!\n");
+}
+
+void AliPythia::DalitzDecays()
+{
+
+ //
+ // Replace all omega dalitz decays with the correct matrix element decays
+ //
+ Int_t nt = fPyjets->N;
+ for (Int_t i = 0; i < nt; i++) {
+ if (fPyjets->K[1][i] != 223) continue;
+ Int_t fd = fPyjets->K[3][i] - 1;
+ Int_t ld = fPyjets->K[4][i] - 1;
+ if (fd < 0) continue;
+ if ((ld - fd) != 2) continue;
+ if ((fPyjets->K[1][fd] != 111) ||
+ ((TMath::Abs(fPyjets->K[1][fd+1]) != 11) && (TMath::Abs(fPyjets->K[1][fd+1]) != 13)))
+ continue;
+ TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
+ Int_t pdg = TMath::Abs(fPyjets->K[1][fd+1]);
+ fOmegaDalitz.Decay(pdg, &omega);
+ for (Int_t j = 0; j < 3; j++) {
+ for (Int_t k = 0; k < 4; k++) {
+ TLorentzVector vec = (fOmegaDalitz.Products())[2-j];
+ fPyjets->P[k][fd+j] = vec[k];
+ }
+ }
+ }
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff