1 #include "AliGenHalo.h"
2 #include "AliGenMUONlib.h"
7 #include <TDirectory.h>
8 #include <TDatabasePDG.h>
13 AliGenHalo::AliGenHalo()
17 fTitle="Halo from LHC Tunnel";
18 // Set the default file
19 fFileName="~/marsip/marsip5.mu";
26 AliGenHalo::AliGenHalo(Int_t npart)
30 fTitle="Halo from LHC Tunnel";
31 // Set the default file
32 fFileName="~/marsip/marsip5.mu";
39 //____________________________________________________________
40 AliGenHalo::~AliGenHalo()
44 //____________________________________________________________
45 void AliGenHalo::Init()
48 //____________________________________________________________
49 void AliGenHalo::Generate()
51 FILE *fp = fopen(fFileName,"r");
53 printf("\n File %s opened for reading ! \n ", fFileName);
55 printf("\n Opening of file %s failed ! \n ", fFileName);
58 // MARS particle codes
59 // const Int_t imars[12]={0,14, 13, 8, 9, 11, 12, 5, 6, 1, 3, 2};
60 const Int_t imars[12]={0,kProton,kNeutron,kPiPlus,kPiMinus,kKPlus,kKMinus,
61 kMuonPlus,kMuonMinus,kGamma,kElectron,kPositron};
63 Float_t polar[3]= {0,0,0};
66 Float_t ekin, wgt, tx, ty, tz, txy;
69 Int_t ipart, ncols, nt;
75 ncols = fscanf(fp,"%i %f %f %f %f %f %f",
77 &origin[0], &origin[1],
81 if (fNpart !=-1 && nread > fNpart) break;
83 amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
84 p0=sqrt(ekin*ekin + 2.*amass);
86 txy=TMath::Sqrt(tx*tx+ty*ty);
90 tz=-TMath::Sqrt(1.-txy);
96 gAlice->SetTrack(1,-1,ipart,p,origin,polar,0,"Halo+",nt,fParentWeight);
99 gAlice->SetTrack(1,-1,ipart,p,origin,polar,0,"Halo-",nt,fParentWeight);
100 origin[2]=-origin[2];