3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
9 // Generator using the TPythia interface (via AliPythia)
10 // to generate pp collisions.
11 // Using SetNuclei() also nuclear modifications to the structure functions
12 // can be taken into account. This makes, of course, only sense for the
13 // generation of the products of hard processes (heavy flavor, jets ...)
15 // andreas.morsch@cern.ch
19 #include "AliPythia.h"
24 class AliGenPythia : public AliGenMC
28 typedef enum {kFlavorSelection, kParentSelection} StackFillOpt_t;
29 typedef enum {kCountAll, kCountParents, kCountTrackables} CountMode_t;
32 AliGenPythia(Int_t npart);
33 AliGenPythia(const AliGenPythia &Pythia);
34 virtual ~AliGenPythia();
35 virtual void Generate();
37 // set a cut on the Z coord. of the primary vertex (cm)
39 virtual void SetEventListRange(Int_t eventFirst=-1, Int_t eventLast=-1);
40 // select process type
41 virtual void SetProcess(Process_t proc = kPyCharm) {fProcess = proc;}
42 // select structure function
43 virtual void SetStrucFunc(StrucFunc_t func = kGRVHO) {fStrucFunc = func;}
44 // select pt of hard scattering
45 virtual void SetPtHard(Float_t ptmin = 0, Float_t ptmax = 1.e10)
46 {fPtHardMin = ptmin; fPtHardMax = ptmax; }
47 virtual void SetYHard(Float_t ymin = -1.e10, Float_t ymax = 1.e10)
48 {fYHardMin = ymin; fYHardMax = ymax; }
49 // set centre of mass energy
50 virtual void SetEnergyCMS(Float_t energy = 5500) {fEnergyCMS = energy;}
51 // treat protons as inside nuclei
52 virtual void SetNuclei(Int_t a1, Int_t a2);
53 virtual void SetJetEtaRange(Float_t etamin = -20., Float_t etamax = 20.)
54 {fEtaMinJet = etamin; fEtaMaxJet = etamax;}
55 virtual void SetJetPhiRange(Float_t phimin = -180., Float_t phimax = 180.)
56 {fPhiMinJet = TMath::Pi()*phimin/180.; fPhiMaxJet = TMath::Pi()*phimax/180.;}
57 virtual void SetGammaEtaRange(Float_t etamin = -20., Float_t etamax = 20.)
58 {fEtaMinGamma = etamin; fEtaMaxGamma = etamax;}
59 virtual void SetGammaPhiRange(Float_t phimin = -180., Float_t phimax = 180.)
60 {fPhiMinGamma = TMath::Pi()*phimin/180.; fPhiMaxGamma = TMath::Pi()*phimax/180.;}
61 // Set option for feed down from higher family
62 virtual void SetFeedDownHigherFamily(Bool_t opt) {
65 // Set option for selecting particles kept in stack according to flavor
66 // or to parent selection
67 virtual void SetStackFillOpt(StackFillOpt_t opt) {
70 // Set fragmentation option
71 virtual void SetFragmentation(const Bool_t opt) {
75 virtual void SetCountMode(const CountMode_t mode) {
79 // get cross section of process
80 virtual Float_t GetXsection() const {return fXsection;}
82 virtual Process_t GetProcess() {return fProcess;}
83 virtual StrucFunc_t GetStrucFunc() {return fStrucFunc;}
84 virtual void GetPtHard(Float_t& ptmin, Float_t& ptmax)
85 {ptmin = fPtHardMin; ptmax = fPtHardMax = ptmax;}
86 virtual Float_t GetEnergyCMS() {return fEnergyCMS;}
87 virtual void GetNuclei(Int_t& a1, Int_t& a2)
88 {a1 = fNucA1; a2 = fNucA2;}
89 virtual void GetJetEtaRange(Float_t& etamin, Float_t& etamax)
90 {etamin = fEtaMinJet; etamax = fEtaMaxJet;}
91 virtual void GetJetPhiRange(Float_t& phimin, Float_t& phimax)
92 {phimin = fPhiMinJet*180./TMath::Pi(); phimax = fPhiMaxJet*180/TMath::Pi();}
93 virtual void GetGammaEtaRange(Float_t& etamin, Float_t& etamax)
94 {etamin = fEtaMinGamma; etamax = fEtaMaxGamma;}
95 virtual void GetGammaPhiRange(Float_t& phimin, Float_t& phimax)
96 {phimin = fPhiMinGamma*180./TMath::Pi(); phimax = fPhiMaxGamma*180./TMath::Pi();}
98 virtual void FinishRun();
99 Bool_t CheckTrigger(TParticle* jet1, TParticle* jet2) const;
101 // Assignment Operator
102 AliGenPythia & operator=(const AliGenPythia & rhs);
104 // adjust the weight from kinematic cuts
105 void AdjustWeights();
107 void MakeHeader() const;
109 TClonesArray* fParticles; //Particle List
111 Process_t fProcess; //Process type
112 StrucFunc_t fStrucFunc; //Structure Function
113 Float_t fEnergyCMS; //Centre of mass energy
114 Float_t fKineBias; //!Bias from kinematic selection
115 Int_t fTrials; //!Number of trials
116 Int_t fFlavorSelect; //Heavy Flavor Selection
117 Float_t fXsection; //Cross-section
118 AliPythia *fPythia; //!Pythia
119 Float_t fPtHardMin; //lower pT-hard cut
120 Float_t fPtHardMax; //higher pT-hard cut
121 Float_t fYHardMin; //lower y-hard cut
122 Float_t fYHardMax; //higher y-hard cut
123 Int_t fNucA1; //mass number nucleus side 1
124 Int_t fNucA2; //mass number nucleus side 2
125 Bool_t fFullEvent; //!Write Full event if true
126 AliDecayer *fDecayer; //!Pointer to the decayer instance
127 Int_t fDebugEventFirst; //!First event to debug
128 Int_t fDebugEventLast; //!Last event to debug
129 Float_t fEtaMinJet; //Minimum eta of triggered Jet
130 Float_t fEtaMaxJet; //Maximum eta of triggered Jet
131 Float_t fPhiMinJet; //Minimum phi of triggered Jet
132 Float_t fPhiMaxJet; //Maximum phi of triggered Jet
134 Float_t fEtaMinGamma; // Minimum eta of triggered gamma
135 Float_t fEtaMaxGamma; // Maximum eta of triggered gamma
136 Float_t fPhiMinGamma; // Minimum phi of triggered gamma
137 Float_t fPhiMaxGamma; // Maximum phi of triggered gamma
139 StackFillOpt_t fStackFillOpt; // Stack filling with all particles with
140 // that flavour or only with selected
141 // parents and their decays
142 Bool_t fFeedDownOpt; // Option to set feed down from higher
143 // quark families (e.g. b->c)
144 Bool_t fFragmentation; // Option to activate fragmentation by Pythia
147 CountMode_t fCountMode; // Options for counting when the event will be finished.
148 // fCountMode = kCountAll --> All particles that end up in the
150 // fCountMode = kCountParents --> Only selected parents are counted
151 // fCountMode = kCountTrackabless --> Only particles flagged for tracking
154 ClassDef(AliGenPythia,2) // AliGenerator interface to Pythia