3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 // Generator using HIJING as an external generator
9 // The main HIJING options are accessable for the user through this interface.
10 // andreas.morsch@cern.ch
20 class AliGenHijing : public AliGenMC
22 enum {kNoTrigger, kHardProcesses, kDirectPhotons};
26 AliGenHijing(Int_t npart);
27 AliGenHijing(const AliGenHijing &Hijing);
28 virtual ~AliGenHijing();
29 virtual void Generate();
31 // set centre of mass energy
32 virtual void SetEnergyCMS(Float_t energy=5500) {fEnergyCMS=energy;}
33 virtual void SetReferenceFrame(TString frame="CMS")
36 virtual void SetImpactParameterRange(Float_t bmin = 0, Float_t bmax = 15.)
37 {fMinImpactParam=bmin; fMaxImpactParam=bmax;}
38 virtual void KeepFullEvent();
39 virtual void SetJetQuenching(Int_t flag=1) {fQuench = flag;}
40 virtual void SetShadowing(Int_t flag=1) {fShadowing = flag;}
41 virtual void SetDecaysOff(Int_t flag=1) {fDecaysOff = flag;}
42 virtual void SetTrigger(Int_t flag=kNoTrigger) {fTrigger = flag;}
43 virtual void SetFlavor(Int_t flag=0) {fFlavor = flag;}
44 virtual void SetEvaluate(Int_t flag=0) {fEvaluate = flag;}
45 virtual void SetSelectAll(Int_t flag=0) {fSelectAll = flag;}
46 virtual void SetRadiation(Int_t flag=3) {fRadiation = flag;}
47 virtual void SetSpectators(Int_t spects=1) {fSpectators = spects;}
48 virtual void SetPtJet(Float_t ptmin) {fPtMinJet = ptmin;}
49 virtual void SetSimpleJets(Int_t flag=0) {fSimpleJet = flag;}
50 virtual void SetNoGammas(Int_t flag=0) {fNoGammas = flag;}
52 virtual void SetJetEtaRange(Float_t etamin = -20., Float_t etamax = 20.)
53 {fEtaMinJet = etamin; fEtaMaxJet = etamax;}
54 virtual void SetJetPhiRange(Float_t phimin = -180., Float_t phimax = 180.)
55 {fPhiMinJet = TMath::Pi()*phimin/180.; fPhiMaxJet = TMath::Pi()*phimax/180.;}
56 virtual void SetBoostLHC(Int_t flag = 0) {fLHC = flag;}
57 virtual void SetRandomPz(Bool_t flag = 0) {fRandomPz = flag;}
59 virtual Float_t GetEnergyCMS() const {return fEnergyCMS;}
60 virtual TString GetReferenceFrame() const {return fFrame;}
61 virtual void GetProjectile(TString& tar, Int_t& a, Int_t& z) const
62 {tar = fProjectile; a = fAProjectile; z = fZProjectile;}
63 virtual void GetTarget(TString& tar, Int_t& a, Int_t& z) const
64 {tar = fTarget; a = fATarget; z = fZTarget;}
65 virtual void GetImpactParameterRange(Float_t& bmin, Float_t& bmax) const
66 {bmin = fMinImpactParam; bmax = fMaxImpactParam;}
67 virtual Int_t GetJetQuenching() const {return fQuench;}
68 virtual Int_t GetShadowing() const {return fShadowing;}
69 virtual Int_t GetTrigger() const {return fTrigger;}
70 virtual Int_t GetFlavor() const {return fFlavor;}
71 virtual Int_t GetRadiation() const {return fRadiation;}
72 virtual Int_t GetSpectators() const {return fSpectators;}
73 virtual Float_t GetPtJet() const {return fPtMinJet;}
74 virtual void GetJetEtaRange(Float_t& etamin, Float_t& etamax) const
75 {etamin = fEtaMinJet; etamax = fEtaMaxJet;}
76 virtual void GetJetPhiRange(Float_t& phimin, Float_t& phimax) const
77 {phimin = fPhiMinJet*180./TMath::Pi(); phimax = fPhiMaxJet*180./TMath::Pi();}
81 virtual Bool_t ProvidesCollisionGeometry() const {return kTRUE;}
82 virtual void EvaluateCrossSections();
83 virtual TGraph* CrossSection() {return fDsigmaDb;}
84 virtual TGraph* BinaryCollisions() {return fDnDb;}
85 virtual Bool_t CheckTrigger();
87 AliGenHijing & operator=(const AliGenHijing & rhs);
89 Bool_t SelectFlavor(Int_t pid);
92 TString fFrame; // Reference frame
93 Float_t fMinImpactParam; // minimum impact parameter
94 Float_t fMaxImpactParam; // maximum impact parameter
95 Int_t fKeep; // Flag to keep full event information
96 Int_t fQuench; // Flag to switch on jet quenching
97 Int_t fShadowing; // Flag to switch on nuclear effects on parton distribution function
98 Int_t fDecaysOff; // Flag to turn off decays of pi0, K_s, D, Lambda, sigma
99 Int_t fTrigger; // Trigger type
100 Int_t fEvaluate; // Evaluate total and partial cross-sections
101 Int_t fSelectAll; // Flag to write the full event
102 Int_t fFlavor; // Selected particle flavor 4: charm+beauty 5: beauty
103 Float_t fEnergyCMS; // Centre of mass energy
104 Float_t fKineBias; // Bias from kinematic selection
105 Int_t fTrials; // Number of trials
106 Float_t fXsection; // Cross-section
107 THijing *fHijing; //!Hijing
108 Float_t fPtHardMin; // lower pT-hard cut
109 Float_t fPtHardMax; // higher pT-hard cut
110 Int_t fSpectators; // put spectators on stack
111 TGraph* fDsigmaDb; // dSigma/db for the system
112 TGraph* fDnDb; // dNBinaryCollisions/db
113 Float_t fPtMinJet; // Minimum Pt of triggered Jet
114 Float_t fEtaMinJet; // Minimum eta of triggered Jet
115 Float_t fEtaMaxJet; // Maximum eta of triggered Jet
116 Float_t fPhiMinJet; // At least one of triggered Jets must be in this
117 Float_t fPhiMaxJet; // phi range
118 Int_t fRadiation; // Flag to switch on/off initial and final state radiation
119 Int_t fSimpleJet; // Flag to produce simple tiggered jet topology
120 Int_t fNoGammas; // Don't write gammas if flag "on"
122 // ZDC proposal (by Chiara) to store num. of SPECTATORS protons and neutrons
123 Int_t fProjectileSpecn;// Num. of spectator neutrons from projectile nucleus
124 Int_t fProjectileSpecp;// Num. of spectator protons from projectile nucleus
125 Int_t fTargetSpecn; // Num. of spectator neutrons from target nucleus
126 Int_t fTargetSpecp; // Num. of spectator protons from target nucleus
127 Int_t fLHC; // Assume LHC as lab frame
128 Int_t fRandomPz; // Randomise sign of pz event by event
130 void Copy(TObject &rhs) const;
131 // adjust the weight from kinematic cuts
132 void AdjustWeights();
133 // check seleted daughters
134 Bool_t DaughtersSelection(TParticle* iparticle);
136 Bool_t Stable(TParticle* particle) const;
138 ClassDef(AliGenHijing, 6) // AliGenerator interface to Hijing