1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 Revision 1.6 2000/06/09 20:36:01 morsch
19 All coding rule violations except RS3 corrected
21 Revision 1.5 1999/11/03 17:43:20 fca
22 New version from G.Martinez & A.Morsch
24 Revision 1.4 1999/09/29 09:24:14 fca
25 Introduction of the Copyright and cvs Log
29 #include "AliGenHalo.h"
33 #include <TDatabasePDG.h>
37 AliGenHalo::AliGenHalo()
42 fTitle="Halo from LHC Tunnel";
43 // Set the default file
44 fFileName=TString("~/marsip/marsip5.mu");
51 AliGenHalo::AliGenHalo(Int_t npart)
56 fTitle="Halo from LHC Tunnel";
57 // Set the default file
58 fFileName=TString("~/marsip/marsip5.mu");
65 AliGenHalo::AliGenHalo(const AliGenHalo & Halo)
71 //____________________________________________________________
72 AliGenHalo::~AliGenHalo()
77 //____________________________________________________________
78 void AliGenHalo::Init()
83 //____________________________________________________________
84 void AliGenHalo::Generate()
86 // Generate from input file
87 FILE *fp = fopen(fFileName,"r");
89 printf("\n File %s opened for reading ! \n ", (char*) &fFileName);
91 printf("\n Opening of file %s failed ! \n ", (char*) &fFileName);
94 // MARS particle codes
95 const Int_t kmars[12]={0,kProton,kNeutron,kPiPlus,kPiMinus,kKPlus,kKMinus,
96 kMuonPlus,kMuonMinus,kGamma,kElectron,kPositron};
98 Float_t polar[3]= {0,0,0};
101 Float_t ekin, wgt, tx, ty, tz, txy;
104 Int_t ipart, ncols, nt;
110 ncols = fscanf(fp,"%i %f %f %f %f %f %f",
112 &origin[0], &origin[1],
114 if (ncols < 0) break;
116 if (fNpart !=-1 && nread > fNpart) break;
117 ipart = kmars[ipart];
118 amass = TDatabasePDG::Instance()->GetParticle(ipart)->Mass();
119 p0=sqrt(ekin*ekin + 2.*amass);
121 txy=TMath::Sqrt(tx*tx+ty*ty);
125 tz=-TMath::Sqrt(1.-txy);
131 gAlice->SetTrack(fTrackIt,-1,ipart,p,origin,polar,0,"Halo+",nt,fParentWeight);
132 origin[2]=-origin[2];
134 gAlice->SetTrack(fTrackIt,-1,ipart,p,origin,polar,0,"Halo-",nt,fParentWeight);
135 origin[2]=-origin[2];
141 AliGenHalo& AliGenHalo::operator=(const AliGenHalo& rhs)
143 // Assignment operator