1 #ifndef ALIDECAYERPOLARIZED_H
2 #define ALIDECAYERPOLARIZED_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
6 // Class to generate decay products for polarized heavy quarkonia
8 #include <TLorentzVector.h>
9 #include <TClonesArray.h>
12 #include "AliDecayerPythia.h"
15 class AliDecayerPolarized : public AliDecayerPythia
18 typedef enum { kNoPol = 0, kColSop = 1, kHelicity = 2} Polar_t;
19 typedef enum { kElectron = 1, kMuon = 2} FinState_t;
20 AliDecayerPolarized();
21 AliDecayerPolarized(Double_t alpha, Polar_t systref, FinState_t decprod);
22 AliDecayerPolarized(const AliDecayerPolarized &decayer):AliDecayerPythia(decayer)
23 {decayer.Copy(*this);}
24 virtual ~AliDecayerPolarized();
25 void SetPolDec(Double_t alpha=0) {fAlpha=alpha;}
26 void SetPolRefSys(Polar_t systref=kColSop) {fSystRef=systref;}
27 void SetDecProd(FinState_t decprod=kMuon) {fDecProd=decprod;}
28 virtual void Init(){;}
29 virtual void Decay(Int_t ipart, TLorentzVector *p);
30 virtual Int_t ImportParticles(TClonesArray *part);
31 void Copy(TObject &decayer) const;
33 AliDecayerPolarized &operator=(const AliDecayerPolarized &decayer)
34 {decayer.Copy(*this);return(*this);}
37 Double_t fAlpha; // Polarization parameter
38 Polar_t fSystRef; // Reference system for polarization
39 FinState_t fDecProd; // Choice of decay products
40 TF1 *fPol; // ! Angular distribution for decay products
41 TParticle *fMother; // ! Particle that has to be decayed
42 TParticle *fDaughter1; // ! Decay product no. 1
43 TParticle *fDaughter2; // ! Decay product no. 2
45 ClassDef(AliDecayerPolarized,1) // Polarized 2-body quarkonium decay