1 #ifndef ALIGENDEUTERON_H
2 #define ALIGENDEUTERON_H
5 /* Copyright(c) 2009-2010, ALICE Experiment at CERN, All rights reserved. *
6 * See cxx source for full Copyright notice */
8 // Afterburner to simulate coalescence of (anti)nucleons
9 // Author: Eulogio Serradilla <eulogio.serradilla@ciemat.es>
10 // Arturo Menchaca <menchaca@fisica.unam.mx>
12 #include "AliGenerator.h"
15 class AliGenDeuteron: public AliGenerator
20 AliGenDeuteron(Int_t sign=1, Double_t pmax=0.1, Double_t rmax=2.1, Int_t cluster=0 );
21 virtual ~AliGenDeuteron();
24 virtual void Generate();
26 Int_t GetSign() const { return fSign;}
27 Double_t GetCoalescenceMomentum() const { return fPmax; }
28 Double_t GetCoalescenceDistance() const { return fRmax; }
29 Double_t GetSpinProbability() const { return fSpinProb; }
30 Double_t GetCoalescenceProbability(const TParticle* nucleon1, const TParticle* nucleon2) const;
31 Int_t GetClusterType() const { return fClusterType; }
32 Int_t GetFreezeOutModel() const { return fModel; }
33 Double_t GetFreezeOutTime() const { return fTimeLength; }
35 void SetSign(Int_t sign) { fSign = sign > 0 ? 1 : -1;}
36 void SetCoalescenceMomentum(Double_t p) { fPmax = p; }
37 void SetCoalescenceDistance(Double_t r) { fRmax = r; }
38 void SetSpinProbability(Double_t s) { fSpinProb = s; }
39 void SetClusterType(Int_t cluster) { fClusterType = cluster; }
40 void SetFreezeOutModel(Int_t model, Double_t timeLength=2.5) { fModel = model; fTimeLength=timeLength;}
44 enum { kFirstPartner=0, kLowestMomentum, kLowestDistance, kBoth };
45 enum { kNone=0, kThermal, kExpansion };
50 AliGenDeuteron(const AliGenDeuteron &other);
51 AliGenDeuteron& operator=(const AliGenDeuteron &other);
53 void FixProductionVertex(class TParticle* i);
54 void FirstPartner(const TList* protons, TList* neutrons);
55 void WeightMatrix(const TList* protons, const TList* neutrons);
56 void PushDeuteron(TParticle* parent1, TParticle* parent2);
58 Double_t GetS(Double_t p1x, Double_t p1y, Double_t p1z, Double_t m1, Double_t p2x, Double_t p2y, Double_t p2z, Double_t m2) const;
59 Double_t GetPcm(Double_t p1x, Double_t p1y, Double_t p1z, Double_t m1, Double_t p2x, Double_t p2y, Double_t p2z, Double_t m2) const;
60 Double_t GetPcm(const TVector3& p1, Double_t m1, const TVector3& p2, Double_t m2) const;
64 Int_t fSign; // +1 for deuterons, -1 for antideuterons
65 Double_t fPmax; // Maximum p-n momentum difference (GeV/c)
66 Double_t fRmax; // Maximum p-n distance (fm)
67 Double_t fSpinProb; // cluster formation probability due to spin
68 Int_t fClusterType; // Probability criteria to find clusters
69 Int_t fModel; // Model to override generator source
70 Double_t fTimeLength; // Thermal and chemical freeze-out time (fm/c)
71 Double_t fB; // Impact parameter (fm)
72 Double_t fR; // Projectile/Target nuclear radius (fm)
73 Double_t fPsiR; // Reaction plane angle
74 AliStack* fCurStack; //! current event stack
76 ClassDef(AliGenDeuteron,2)
79 #endif // ALIGENDEUTERON_H