User set central field value.

[u/mrichter/AliRoot.git] / PYTHIA6 / AliGenPythia.h

#ifndef ALIGENPYTHIA_H
#define ALIGENPYTHIA_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

//
// Generator using the TPythia interface (via AliPythia)
// to generate pp collisions.
// Using SetNuclei() also nuclear modifications to the structure functions
// can be taken into account. This makes, of course, only sense for the
// generation of the products of hard processes (heavy flavor, jets ...)
//
// andreas.morsch@cern.ch
//

#include "AliGenMC.h"
#include "AliPythia.h"

class AliPythia;
class TParticle;

class AliGenPythia : public AliGenMC
{
 public:

    typedef enum {kFlavorSelection, kParentSelection} StackFillOpt_t;
    typedef enum {kCountAll, kCountParents, kCountTrackables} CountMode_t;
    typedef enum {kCluster, kCell} JetRecMode_t;
	  
    AliGenPythia();
    AliGenPythia(Int_t npart);
    AliGenPythia(const AliGenPythia &Pythia);
    virtual ~AliGenPythia();
    virtual void    Generate();
    virtual void    Init();
    // set a cut on the Z coord. of the primary vertex (cm)
    //
    virtual void    SetEventListRange(Int_t eventFirst=-1, Int_t eventLast=-1);
    // select process type
    virtual void    SetProcess(Process_t proc = kPyCharm) {fProcess = proc;}
    // select structure function
    virtual void    SetStrucFunc(StrucFunc_t func = kGRVHO) {fStrucFunc = func;}
    // select pt of hard scattering 
    virtual void    SetPtHard(Float_t ptmin = 0, Float_t ptmax = 1.e10)
	{fPtHardMin = ptmin; fPtHardMax = ptmax; }
    virtual void    SetYHard(Float_t ymin = -1.e10, Float_t ymax = 1.e10)
	{fYHardMin = ymin; fYHardMax = ymax; }
    // Set initial and final state gluon radiation
    virtual void    SetGluonRadiation(Int_t iIn, Int_t iFin)
	{fGinit = iIn; fGfinal = iFin;}
    virtual void    SetPtKick(Float_t kt = 1.)
	{fPtKick = kt;}
    // set centre of mass energy
    virtual void    SetEnergyCMS(Float_t energy = 5500) {fEnergyCMS = energy;}
    // treat protons as inside nuclei
    virtual void    SetNuclei(Int_t a1, Int_t a2);
    virtual void    SetJetEtRange(Float_t etmin = 0., Float_t etmax = 1.e4)
	{fEtMinJet = etmin; fEtMaxJet = etmax;}
    virtual void    SetJetEtaRange(Float_t etamin = -20., Float_t etamax = 20.)
	{fEtaMinJet = etamin; fEtaMaxJet = etamax;}
    virtual void    SetJetReconstructionMode(Int_t mode = kCell) {fJetReconstruction = mode;}
    virtual void    SetJetPhiRange(Float_t phimin = 0., Float_t phimax = 360.)
	{fPhiMinJet = TMath::Pi()*phimin/180.; fPhiMaxJet = TMath::Pi()*phimax/180.;}
    virtual void    SetGammaEtaRange(Float_t etamin = -20., Float_t etamax = 20.)
	{fEtaMinGamma = etamin; fEtaMaxGamma = etamax;}
    virtual void    SetGammaPhiRange(Float_t phimin = 0., Float_t phimax = 360.)
	{fPhiMinGamma = TMath::Pi()*phimin/180.; fPhiMaxGamma = TMath::Pi()*phimax/180.;}
    // Set option for feed down from higher family
    virtual void SetFeedDownHigherFamily(Bool_t opt) {
      fFeedDownOpt = opt;
    }
    // Set option for selecting particles kept in stack according to flavor
    // or to parent selection
    virtual void SetStackFillOpt(StackFillOpt_t opt) {
      fStackFillOpt = opt;
    }
    // Set fragmentation option
    virtual void SetFragmentation(const Bool_t opt) {
      fFragmentation = opt;
    }
    // Set counting mode
    virtual void SetCountMode(const CountMode_t mode) {
      fCountMode = mode;
    }
    
    // get cross section of process
    virtual Float_t GetXsection() const {return fXsection;}
    // get triggered jets
    void GetJets(Int_t& njets, Int_t& ntrig, Float_t[4][10]);
    void RecJetsUA1(Float_t eCellMin, Float_t eCellSeed, Float_t eMin, Float_t rMin, 
		    Int_t& njets, Float_t jets[4][50]);
    void SetPycellParameters(Float_t etamax = 2., Int_t neta = 274, Int_t nphi = 432,
			     Float_t thresh = 0., Float_t etseed = 4.,
			     Float_t minet = 10., Float_t r = 1.);
    
    void LoadEvent();
    // Getters
    virtual Process_t    GetProcess() {return fProcess;}
    virtual StrucFunc_t  GetStrucFunc() {return fStrucFunc;}
    virtual void         GetPtHard(Float_t& ptmin, Float_t& ptmax)
	{ptmin = fPtHardMin; ptmax = fPtHardMax = ptmax;}
    virtual Float_t      GetEnergyCMS() {return fEnergyCMS;}
    virtual void         GetNuclei(Int_t&  a1, Int_t& a2)
	{a1 = fNucA1; a2 = fNucA2;}
    virtual void         GetJetEtRange(Float_t& etamin, Float_t& etamax)
	{etamin = fEtaMinJet; etamax = fEtaMaxJet;}
    virtual void         GetJetPhiRange(Float_t& phimin, Float_t& phimax)
	{phimin = fPhiMinJet*180./TMath::Pi(); phimax = fPhiMaxJet*180/TMath::Pi();}
    virtual void         GetGammaEtaRange(Float_t& etamin, Float_t& etamax)
	{etamin = fEtaMinGamma; etamax = fEtaMaxGamma;}
    virtual void         GetGammaPhiRange(Float_t& phimin, Float_t& phimax)
	{phimin = fPhiMinGamma*180./TMath::Pi(); phimax = fPhiMaxGamma*180./TMath::Pi();}
    //
    virtual void FinishRun();
    Bool_t CheckTrigger(TParticle* jet1, TParticle* jet2);
    
    // Assignment Operator
    AliGenPythia & operator=(const AliGenPythia & rhs);
 protected:
    // adjust the weight from kinematic cuts
    void   AdjustWeights();
    Int_t  GenerateMB();
    void   MakeHeader();    

    TClonesArray* fParticles;       //Particle  List
    
    Process_t   fProcess;           //Process type
    StrucFunc_t fStrucFunc;         //Structure Function
    Float_t     fEnergyCMS;         //Centre of mass energy
    Float_t     fKineBias;          //!Bias from kinematic selection
    Int_t       fTrials;            //!Number of trials for current event
    Int_t       fTrialsRun;         //!Number of trials for run
    Float_t     fQ;                 //Mean Q
    Float_t     fX1;                //Mean x1
    Float_t     fX2;                //Mean x2
    Int_t       fNev;               //Number of events 
    Int_t       fFlavorSelect;      //Heavy Flavor Selection
    Float_t     fXsection;          //Cross-section
    AliPythia   *fPythia;           //!Pythia 
    Float_t     fPtHardMin;         //lower pT-hard cut 
    Float_t     fPtHardMax;         //higher pT-hard cut
    Float_t     fYHardMin;          //lower  y-hard cut 
    Float_t     fYHardMax;          //higher y-hard cut
    Int_t       fNucA1;             //mass number nucleus side 1
    Int_t       fNucA2;             //mass number nucleus side 2
    Int_t       fGinit;             //initial state gluon radiation
    Int_t       fGfinal;            //final state gluon radiation
    Float_t     fPtKick;            //Transverse momentum kick
    Bool_t      fFullEvent;         //!Write Full event if true
    AliDecayer  *fDecayer;          //!Pointer to the decayer instance
    Int_t       fDebugEventFirst;   //!First event to debug
    Int_t       fDebugEventLast;    //!Last  event to debug
    Float_t     fEtMinJet;          //Minimum et of triggered Jet
    Float_t     fEtMaxJet;          //Maximum et of triggered Jet
    Float_t     fEtaMinJet;         //Minimum eta of triggered Jet
    Float_t     fEtaMaxJet;         //Maximum eta of triggered Jet
    Float_t     fPhiMinJet;         //Minimum phi of triggered Jet
    Float_t     fPhiMaxJet;         //Maximum phi of triggered Jet
    Int_t       fJetReconstruction; //Jet Reconstruction mode 
    Float_t     fEtaMinGamma;       // Minimum eta of triggered gamma
    Float_t     fEtaMaxGamma;       // Maximum eta of triggered gamma
    Float_t     fPhiMinGamma;       // Minimum phi of triggered gamma
    Float_t     fPhiMaxGamma;       // Maximum phi of triggered gamma
    Float_t     fPycellEtaMax;      // Max. eta for Pycell 
    Int_t       fPycellNEta;        // Number of eta bins for Pycell 
    Int_t       fPycellNPhi;        // Number of phi bins for Pycell
    Float_t	fPycellThreshold;   // Pycell threshold
    Float_t 	fPycellEtSeed;      // Pycell seed
    Float_t	fPycellMinEtJet;    // Pycell min. jet et
    Float_t	fPycellMaxRadius;   // Pycell cone radius
    StackFillOpt_t fStackFillOpt;   // Stack filling with all particles with
                                    // that flavour or only with selected
                                    // parents and their decays
    Bool_t fFeedDownOpt;            // Option to set feed down from higher
                                    // quark families (e.g. b->c)
    Bool_t fFragmentation;          // Option to activate fragmentation by Pythia
    //

    CountMode_t fCountMode;         // Options for counting when the event will be finished.
    // fCountMode = kCountAll         --> All particles that end up in the
    //                                    stack are counted
    // fCountMode = kCountParents     --> Only selected parents are counted
    // fCountMode = kCountTrackabless --> Only particles flagged for tracking
    //                                     are counted
    //
    ClassDef(AliGenPythia,4) // AliGenerator interface to Pythia
};
#endif