ROOT_528-00b_version: include/TGenPhaseSpace.h Source File

00001 // @(#)root/physics:$Id: TGenPhaseSpace.h 20882 2007-11-19 11:31:26Z rdm $
00002 // Author: Rene Brun , Valerio Filippini  06/09/2000 
00003 
00004 ///////////////////////////////////////////////////////////////////////////////
00005 //                                                                           //
00006 //   Phase Space Generator, based on the GENBOD routine of CERNLIB           //
00007 //                                                                           //
00008 ///////////////////////////////////////////////////////////////////////////////
00009    
00010 #ifndef ROOT_TGenPhaseSpace
00011 #define ROOT_TGenPhaseSpace
00012 
00013 #include "TLorentzVector.h"
00014 
00015 class TGenPhaseSpace : public TObject {
00016 private:  
00017    Int_t        fNt;             // number of decay particles
00018    Double_t     fMass[18];       // masses of particles
00019    Double_t     fBeta[3];        // betas of decaying particle
00020    Double_t     fTeCmTm;         // total energy in the C.M. minus the total mass
00021    Double_t     fWtMax;          // maximum weigth 
00022    TLorentzVector  fDecPro[18];  //kinematics of the generated particles 
00023 
00024    Double_t PDK(Double_t a, Double_t b, Double_t c);  
00025 
00026 public:
00027    TGenPhaseSpace() {}
00028    TGenPhaseSpace(const TGenPhaseSpace &gen);
00029    virtual ~TGenPhaseSpace() {}
00030 
00031    Bool_t          SetDecay(TLorentzVector &P, Int_t nt, Double_t *mass, Option_t *opt="");
00032    Double_t        Generate();
00033    TLorentzVector *GetDecay(Int_t n); 
00034 
00035    Int_t    GetNt()      const { return fNt;}
00036    Double_t GetWtMax()   const { return fWtMax;}
00037 
00038    ClassDef(TGenPhaseSpace,1) //Simple Phase Space Generator
00039 };
00040 
00041 #endif
00042