+
/**************************************************************************
* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
* *
# define pycell pycell_
# define pyshow pyshow_
# define pyrobo pyrobo_
+# define pyquen pyquen_
+# define pyevnw pyevnw_
# define type_of_call
#else
# define pyclus PYCLUS
# define pycell PYCELL
# define pyrobo PYROBO
+# define pyquen PYQUEN
+# define pyevnw PYEVNW
# 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(){;}
//_____________________________________________________________________________
AliPythia* AliPythia::fgAliPythia=NULL;
-AliPythia::AliPythia()
+AliPythia::AliPythia():
+ fProcess(kPyMb),
+ fEcms(0.),
+ fStrucFunc(kCTEQ5L),
+ fXJet(0.),
+ fYJet(0.),
+ fGlauber(0),
+ fQuenchingWeights(0)
{
// Default Constructor
//
fQuenchingWeights = 0;
}
+AliPythia::AliPythia(const AliPythia& pythia):
+ TPythia6(pythia),
+ AliRndm(pythia),
+ fProcess(kPyMb),
+ fEcms(0.),
+ fStrucFunc(kCTEQ5L),
+ fXJet(0.),
+ fYJet(0.),
+ fGlauber(0),
+ fQuenchingWeights(0)
+{
+ // Copy Constructor
+ pythia.Copy(*this);
+}
+
void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
{
// Initialise the process to generate
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);
+ SetMDCY(Pycomp(310) ,1,0);
+ SetMDCY(Pycomp(3122),1,0);
+ SetMDCY(Pycomp(3112),1,0);
+ SetMDCY(Pycomp(3212),1,0);
+ SetMDCY(Pycomp(3222),1,0);
+ SetMDCY(Pycomp(3312),1,0);
+ SetMDCY(Pycomp(3322),1,0);
+ SetMDCY(Pycomp(3334),1,0);
+ // Select structure function
SetMSTP(52,2);
SetMSTP(51,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
-//
-// ATLAS Tuning
-//
- SetMSTP(51,7); // CTEQ5L pdf
+ AtlasTuning();
+ 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
+
+ SetMSTP(51,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
SetMSEL(0);
SetMSUB(95,1); // low pt production
-//
-// ATLAS Tuning
-//
-
- SetMSTP(51,7); // CTEQ5L pdf
- SetMSTP(81,1); // Multiple Interactions ON
- SetMSTP(82,4); // Double Gaussian Model
-
- 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
+ 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(67,4.); // Regulates Initial State Radiation
+ 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:
+ 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:
+ 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:
// 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 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
+ // 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.);
+
+ // Set c-quark mass
+ 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 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
{
// Call Pythia jet reconstruction algorithm
//
- Int_t numpart = fPyjets->N;
- for (Int_t i = 0; i < numpart; i++)
- {
- if (fPyjets->K[2][i] == 7) ip1 = i+1;
- if (fPyjets->K[2][i] == 8) ip2 = i+1;
- }
-
-
- qmax = 2. * GetVINT(51);
- printf("Pyshow %d %d %f", ip1, ip2, qmax);
-
pyshow(ip1, ip2, qmax);
}
-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)
{
// 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->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();
-
}
//
//
//
- const Int_t kGluons = 1;
+ 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};
- Int_t kglu[2];
+ 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];
+ 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];
+ Int_t nGluon[4];
+ Int_t qPdg[4];
Int_t imo, kst, pdg;
+
//
-// Primary partons
+// Sore information about Primary partons
//
-
- 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((e + pz + 1.e-14) / (e - pz + 1.e-14));
+// 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
+//
+ 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] > 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] == 1.) fZQuench[j] = 0.97;
//
// Some debug printing
- printf("Initial parton # %3d, Type %3d Energy %10.3f Phi %10.3f Length %10.3f Loss %10.3f Kick %10.3f\n",
- j, itype, eq[j], phi, l, eloss, wjtKick[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]);
+
+// fZQuench[j] = 0.8;
+// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
}
- quenched[j] = (zInitial[j] > 0.01);
- }
-
-//
-// Radiated partons
-//
- zInitial[0] = 1. - TMath::Power(1. - zInitial[0], 1./Double_t(kGluons));
- zInitial[1] = 1. - TMath::Power(1. - zInitial[1], 1./Double_t(kGluons));
- wjtKick[0] = wjtKick[0] / TMath::Sqrt(Double_t(kGluons));
- wjtKick[1] = wjtKick[1] / TMath::Sqrt(Double_t(kGluons));
-// this->Pylist(1);
+
+ quenched[j] = (fZQuench[j] > 0.01);
+ } // primary partons
+
-// Arrays to store particle 4-momenta to be changed
-//
-/*
- Double_t** pNew = new Double_t* [numpart];
- for (Int_t i = 0; i < numpart; i++) pNew[i] = new Double_t [4];
- Int_t* kNew = new Int_t [numpart];
-*/
Double_t pNew[1000][4];
Int_t kNew[1000];
Int_t icount = 0;
+ Double_t zquench[4];
+
//
-// Radiation Loop
- for (Int_t iglu = 0; iglu < kGluons; iglu++) {
- for (Int_t isys = 0; isys < 2; isys++) {
+// System Loop
+ for (Int_t isys = 0; isys < 4; isys++) {
// Skip to next system if not quenched.
+ if (!quenched[isys]) continue;
+
+ nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
+ if (nGluon[isys] > 30) nGluon[isys] = 30;
+ zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
+ wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
-
- Double_t zHeavy = zInitial[isys];
-
- if (!quenched[isys]) continue;
+
+
+ Int_t igMin = -1;
+ Int_t igMax = -1;
+ Double_t pg[4] = {0., 0., 0., 0.};
+
//
+// Loop on radiation events
+
+ for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
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 -= 1000;
+// Save 4-momentum sum for balancing
+ Int_t index = isys;
p0[index][0] += px;
p0[index][1] += py;
p0[index][2] += pz;
p0[index][3] += e;
+
+ klast[index] = i;
-// Don't quench radiated gluons
//
- if (imo == 1000 + isys + 7) {
- p1[index][0] += px;
- p1[index][1] += py;
- p1[index][2] += pz;
- p1[index][3] += e;
- continue;
- }
+// Fractional energy loss
+ Double_t z = zquench[index];
+
+// Don't fully quench radiated gluons
//
-
- klast[index] = i;
+ if (imo > 1000) {
+// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
+//
+
+ z = 0.02;
+ }
+// printf("z: %d %f\n", imo, z);
+
//
-// Fractional energy loss
- Double_t z = zInitial[index];
- if (m > 0.) z = zHeavy;
//
//
//
// Kinematic limit on z
//
-
- if (m > 0.) {
- zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
- if (z > zmax) {
- printf("We have to put z to the kinematic limit %e %e \n", z, zmax);
- z = 0.9999 * zmax;
- } // z > zmax
-
- if (z < 0.01) {
-//
-// If z is too small, there is no phase space for quenching
-//
- printf("No phase space for quenching ! %e \n", z);
- p1[index][0] += px;
- p1[index][1] += py;
- p1[index][2] += pz;
- p1[index][3] += e;
- continue;
- }
- } // massive particles
-
+ if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
//
// Change light-cone kinematics rel. to initial parton
//
// if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
Double_t mt2New = eppzNew * empzNew;
if (mt2New < 1.e-8) mt2New = 0.;
-
- if (m * m > mt2New) {
- //
- // This should not happen
- //
- Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
- jtNew = 0;
+ if (z < zmax) {
+ if (m * m > mt2New) {
+ //
+ // This should not happen
+ //
+ Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
+ jtNew = 0;
+ } else {
+ jtNew = TMath::Sqrt(mt2New - m * m);
+ }
} else {
- jtNew = TMath::Sqrt(mt2New - m * m);
+ // If pT is to small (probably a leading massive particle) we scale only the energy
+ // This can cause negative masses of the radiated gluon
+ // Let's hope for the best ...
+ jtNew = jt;
+ eNew = TMath::Sqrt(plNew * plNew + mt2);
+
}
-
-
//
// Calculate new px, py
//
p2[isys][j] = p0[isys][j] - p1[isys][j];
}
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];
-
if (p2[isys][4] > 0.) {
p2[isys][4] = TMath::Sqrt(p2[isys][4]);
break;
} else {
- printf("Warning negative mass squared in system %d %f ! \n", isys, zInitial[isys]);
-
- printf("Kinematics %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]);
+ 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 ! Let's try to fix this by decreasing z\n");
-// this->Pylist(1);
-
+ printf("Negative mass squared !\n");
+ // Here we have to put the gluon back to mass shell
+ // This will lead to a small energy imbalance
+ p2[isys][4] = 0.;
+ p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
+ break;
} else {
p2[isys][4] = 0.;
break;
}
}
- //
- // jt-kick
- //
/*
- TVector3 v(p2[k][0], p2[k][1], p2[k][2]);
- v.RotateZ(-phiq[k]);
- v.RotateY(-thetaq[k]);
- Double_t px = v.X(); Double_t py = v.Y(); Double_t pz = v.Z();
- Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
- Double_t jtKick = wjtKick[k] * TMath::Sqrt(-TMath::Log(r));
- Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
- px += jtKick * TMath::Cos(phiKick);
- py += jtKick * TMath::Sin(phiKick);
- TVector3 w(px, py, pz);
- w.RotateY(thetaq[k]);
- w.RotateZ(phiq[k]);
- p2[k][0] = w.X(); p2[k][1] = w.Y(); p2[k][2] = w.Z();
- p2[k][3] = TMath::Sqrt(p2[k][0] * p2[k][0] + p2[k][1] * p2[k][1] + p2[k][2] * p2[k][2] + p2[k][4] * p2[k][4]);
- */
zHeavy *= 0.98;
printf("zHeavy lowered to %f\n", zHeavy);
if (zHeavy < 0.01) {
quenched[isys] = kFALSE;
break;
}
- } // iteration on z
-
+ */
+ } // iteration on z (while)
+
// Update event record
for (Int_t k = 0; k < icount; k++) {
// 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] );
fPyjets->P[2][kNew[k]] = pNew[k][2];
fPyjets->P[3][kNew[k]] = pNew[k][3];
}
- } // System
- //
- // Add the gluons
- //
- Int_t ish = 0;
- for (Int_t i = 0; i < 2; i++) {
- Int_t jmin, jmax, iGlu, iNew;
- if (!quenched[i]) continue;
+ //
+ // Add the gluons
+ //
+ Int_t ish = 0;
+ Int_t iGlu;
+ if (!quenched[isys]) continue;
//
// Last parton from shower i
- Int_t in = klast[i];
+ Int_t in = klast[isys];
//
// Continue if no parton in shower i selected
if (in == -1) continue;
//
// If this is the second initial parton and it is behind the first move pointer by previous ish
- if (i == 1 && klast[1] > klast[0]) in += ish;
+ if (isys == 1 && klast[1] > klast[0]) in += ish;
//
// Starting index
- jmin = in - 1;
+// jmin = in - 1;
// How many additional gluons will be generated
ish = 1;
- if (p2[i][4] > 0.05) ish = 2;
+ if (p2[isys][4] > 0.05) ish = 2;
//
// Position of gluons
- iGlu = in;
- iNew = in + ish;
- jmax = numpart + ish - 1;
-
- if (fPyjets->K[0][in-1] == 1 || fPyjets->K[0][in-1] == 21 || fPyjets->K[0][in-1] == 11) {
- jmin = in;
- iGlu = in + 1;
- iNew = in;
- }
-
- kglu[i] = iGlu;
-//
-// Shift stack
-//
- for (Int_t j = jmax; j > jmin; j--)
- {
- for (Int_t k = 0; k < 5; k++) {
- fPyjets->K[k][j] = fPyjets->K[k][j-ish];
- fPyjets->P[k][j] = fPyjets->P[k][j-ish];
- fPyjets->V[k][j] = fPyjets->V[k][j-ish];
- }
- } // end shifting
-
+ iGlu = numpart;
+ if (iglu == 0) igMin = iGlu;
+ igMax = iGlu;
numpart += ish;
(fPyjets->N) += ish;
-
+
if (ish == 1) {
- fPyjets->P[0][iGlu] = p2[i][0];
- fPyjets->P[1][iGlu] = p2[i][1];
- fPyjets->P[2][iGlu] = p2[i][2];
- fPyjets->P[3][iGlu] = p2[i][3];
- fPyjets->P[4][iGlu] = p2[i][4];
+ fPyjets->P[0][iGlu] = p2[isys][0];
+ fPyjets->P[1][iGlu] = p2[isys][1];
+ fPyjets->P[2][iGlu] = p2[isys][2];
+ fPyjets->P[3][iGlu] = p2[isys][3];
+ fPyjets->P[4][iGlu] = p2[isys][4];
- fPyjets->K[0][iGlu] = 2;
+ fPyjets->K[0][iGlu] = 1;
+ if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
fPyjets->K[1][iGlu] = 21;
- fPyjets->K[2][iGlu] = fPyjets->K[2][iNew] + 1000;
+ fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
fPyjets->K[3][iGlu] = -1;
fPyjets->K[4][iGlu] = -1;
+
+ pg[0] += p2[isys][0];
+ pg[1] += p2[isys][1];
+ pg[2] += p2[isys][2];
+ pg[3] += p2[isys][3];
} else {
//
// Split gluon in rest frame.
//
- Double_t bx = p2[i][0] / p2[i][3];
- Double_t by = p2[i][1] / p2[i][3];
- Double_t bz = p2[i][2] / p2[i][3];
- Double_t pst = p2[i][4] / 2.;
+ Double_t bx = p2[isys][0] / p2[isys][3];
+ Double_t by = p2[isys][1] / p2[isys][3];
+ Double_t bz = p2[isys][2] / p2[isys][3];
+ Double_t pst = p2[isys][4] / 2.;
//
// Isotropic decay ????
Double_t cost = 2. * gRandom->Rndm() - 1.;
fPyjets->P[3][iGlu] = pst;
fPyjets->P[4][iGlu] = 0.;
- fPyjets->K[0][iGlu] = 2;
+ fPyjets->K[0][iGlu] = 1 ;
fPyjets->K[1][iGlu] = 21;
- fPyjets->K[2][iGlu] = fPyjets->K[2][iNew] + 1000;
+ fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
fPyjets->K[3][iGlu] = -1;
fPyjets->K[4][iGlu] = -1;
fPyjets->P[3][iGlu+1] = pst;
fPyjets->P[4][iGlu+1] = 0.;
- fPyjets->K[0][iGlu+1] = 2;
+ fPyjets->K[0][iGlu+1] = 1;
+ if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
fPyjets->K[1][iGlu+1] = 21;
- fPyjets->K[2][iGlu+1] = fPyjets->K[2][iNew] + 1000;
+ fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
fPyjets->K[3][iGlu+1] = -1;
fPyjets->K[4][iGlu+1] = -1;
SetMSTU(1,0);
//
Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
}
- }
+/*
+ for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
+ Double_t px, py, pz;
+ px = fPyjets->P[0][ig];
+ py = fPyjets->P[1][ig];
+ pz = fPyjets->P[2][ig];
+ TVector3 v(px, py, pz);
+ v.RotateZ(-phiq[isys]);
+ v.RotateY(-thetaq[isys]);
+ Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
+ Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
+ Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
+ if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
+ Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
+ pxs += jtKick * TMath::Cos(phiKick);
+ pys += jtKick * TMath::Sin(phiKick);
+ TVector3 w(pxs, pys, pzs);
+ w.RotateY(thetaq[isys]);
+ w.RotateZ(phiq[isys]);
+ fPyjets->P[0][ig] = w.X();
+ fPyjets->P[1][ig] = w.Y();
+ fPyjets->P[2][ig] = w.Z();
+ fPyjets->P[2][ig] = w.Mag();
+ }
+*/
+ } // kGluon
+
- // Check energy conservation
+ // Check energy conservation
Double_t pxs = 0.;
Double_t pys = 0.;
Double_t pzs = 0.;
TMath::Abs(pys) > 1.e-2 ||
TMath::Abs(pzs) > 1.e-1) {
printf("%e %e %e %e\n", pxs, pys, pzs, es);
- this->Pylist(1);
- Fatal("Quench()", "4-Momentum non-conservation");
+// Fatal("Quench()", "4-Momentum non-conservation");
}
-// this->Pylist(1);
-
- } // end quenching loop
+
+ } // end quenching loop (systems)
// Clean-up
for (Int_t i = 0; i < numpart; i++)
{
- imo = fPyjets->K[2][i];
- if (imo > 1000) fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
+ imo = fPyjets->K[2][i];
+ if (imo > 1000) {
+ fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
+ }
}
-
+// this->Pylist(1);
+} // end quench
+
+
+void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
+{
+ // Igor Lokthine's quenching routine
+ pyquen(a, ibf, b);
+}
+
+void AliPythia::Pyevnw()
+{
+ // New multiple interaction scenario
+ pyevnw();
+}
+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);
-// delete[] kNew;
-// delete[] pNew;
+ // 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);
-} // end quench
+ // 2nd order alpha_s
+ SetMSTP(2,2);
+
+ // QCD scales
+ SetMSTP(32,2);
+ SetPARP(34,1.0);
+}
+
+void AliPythia::AtlasTuning()
+{
+ //
+ // Configuration for the ATLAS tuning
+ SetMSTP(51, 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
+}
+
+AliPythia& AliPythia::operator=(const AliPythia& rhs)
+{
+// Assignment operator
+ rhs.Copy(*this);
+ return *this;
+}
+
+ void AliPythia::Copy(TObject&) const
+{
+ //
+ // Copy
+ //
+ Fatal("Copy","Not implemented!\n");
+}