+
/**************************************************************************
* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
* *
#include "AliPythia.h"
#include "AliPythiaRndm.h"
-#include "../FASTSIM/AliFastGlauber.h"
-#include "../FASTSIM/AliQuenchingWeights.h"
+#include "AliFastGlauber.h"
+#include "AliQuenchingWeights.h"
#include "TVector3.h"
+#include "PyquenCommon.h"
ClassImp(AliPythia)
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)
{
// Default Constructor
//
fQuenchingWeights = 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)
+{
+ // Copy Constructor
+ pythia.Copy(*this);
+}
+
void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
{
// Initialise the process to generate
SetMDCY(Pycomp(3312),1,0);
SetMDCY(Pycomp(3322),1,0);
SetMDCY(Pycomp(3334),1,0);
- // select structure function
+ // 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//
//
SetMSTP(88,2);
// (D=1)see can be used to form baryons (BARYON JUNCTION)
SetMSTJ(1,1);
- SetMSTP(51,kCTEQ5L);// CTEQ 5L ! 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 dist. (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); // Regulate gluon prod. mechanism
+ 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 kPyMbDefault:
+// Minimum Bias pp-Collisions
//
-// ATLAS Tuning
-//
-
- SetMSTP(51, kCTEQ5L); // CTEQ5L pdf
+//
+// 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
+
+ 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,kCTEQ5L); // 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:
//
SetMSEL(1);
// Pythia Tune A (CDF)
//
- SetPARP(67,4.); // Regulates Initial State Radiation
+ 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
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.
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.
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.
// Set c-quark mass
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
// 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);
+
+ AtlasTuning();
+ break;
case kPyW:
//Inclusive production of W+/-
//
// Initialize PYTHIA
SetMSTP(41,1); // all resonance decays switched on
-
Initialize("CMS","p","p",fEcms);
-
+
}
Int_t AliPythia::CheckedLuComp(Int_t kf)
-void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, 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->Init(2);
fGlauber->SetCentralityClass(cMin, cMax);
fQuenchingWeights->InitMult();
fQuenchingWeights->SetK(k);
fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
+ fNGmax = ngmax;
+ fZmax = zmax;
+
}
//
// Avoid complete loss
//
- if (fZQuench[j] == 1.) fZQuench[j] = 0.95;
+ if (fZQuench[j] == 1.) fZQuench[j] = fZmax;
//
// Some debug printing
if (!quenched[isys]) continue;
nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
- if (nGluon[isys] > 6) nGluon[isys] = 6;
+ 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]));
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
// No multiple interactions
SetMSTP(81,0);
- SetPARP(81,0.0);
- SetPARP(82,0.0);
-
+ SetPARP(81, 0.);
+ SetPARP(82, 0.);
// Initial/final parton shower on (Pythia default)
SetMSTP(61,1);
SetMSTP(71,1);
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");
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff