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1 | // $Id$ | |
2 | // ************************************************************************** | |
3 | // This file is property of and copyright by the ALICE HLT Project * | |
4 | // ALICE Experiment at CERN, All rights reserved. * | |
5 | // * | |
6 | // Primary Authors: Sergey Gorbunov <sergey.gorbunov@kip.uni-heidelberg.de> * | |
7 | // Ivan Kisel <kisel@kip.uni-heidelberg.de> * | |
8 | // for The ALICE HLT Project. * | |
9 | // * | |
10 | // Permission to use, copy, modify and distribute this software and its * | |
11 | // documentation strictly for non-commercial purposes is hereby granted * | |
12 | // without fee, provided that the above copyright notice appears in all * | |
13 | // copies and that both the copyright notice and this permission notice * | |
14 | // appear in the supporting documentation. The authors make no claims * | |
15 | // about the suitability of this software for any purpose. It is * | |
16 | // provided "as is" without express or implied warranty. * | |
17 | // * | |
18 | //*************************************************************************** | |
19 | ||
20 | ||
21 | #include "AliHLTTPCCAMCTrack.h" | |
22 | #include "AliHLTTPCCAMath.h" | |
23 | #include "TParticle.h" | |
24 | #include "TDatabasePDG.h" | |
25 | ||
26 | ||
27 | AliHLTTPCCAMCTrack::AliHLTTPCCAMCTrack() | |
28 | : fPDG( 0 ), fP( 0 ), fPt( 0 ), fNHits( 0 ), fNMCPoints( 0 ), fFirstMCPointID( 0 ), fNReconstructed( 0 ), fSet( 0 ), fNTurns( 0 ) | |
29 | { | |
30 | //* Default constructor | |
31 | } | |
32 | ||
33 | ||
34 | AliHLTTPCCAMCTrack::AliHLTTPCCAMCTrack( const TParticle *part ) | |
35 | : fPDG( 0 ), fP( 0 ), fPt( 0 ), fNHits( 0 ), fNMCPoints( 0 ), fFirstMCPointID( 0 ), fNReconstructed( 0 ), fSet( 0 ), fNTurns( 0 ) | |
36 | { | |
37 | //* Constructor from TParticle | |
38 | ||
39 | for ( int i = 0; i < 7; i++ ) fPar[i] = 0; | |
40 | for ( int i = 0; i < 7; i++ ) fTPCPar[i] = 0; | |
41 | fP = 0; | |
42 | fPt = 0; | |
43 | ||
44 | if ( !part ) return; | |
45 | TLorentzVector mom, vtx; | |
46 | part->ProductionVertex( vtx ); | |
47 | part->Momentum( mom ); | |
48 | fPar[0] = part->Vx(); | |
49 | fPar[1] = part->Vy(); | |
50 | fPar[2] = part->Vz(); | |
51 | fP = part->P(); | |
52 | fPt = part->Pt(); | |
53 | double pi = ( fP > 1.e-4 ) ? 1. / fP : 0; | |
54 | fPar[3] = part->Px() * pi; | |
55 | fPar[4] = part->Py() * pi; | |
56 | fPar[5] = part->Pz() * pi; | |
57 | fPar[6] = 0; | |
58 | fPDG = part->GetPdgCode(); | |
59 | if ( CAMath::Abs( fPDG ) < 100000 ) { | |
60 | TParticlePDG *pPDG = TDatabasePDG::Instance()->GetParticle( fPDG ); | |
61 | if ( pPDG ) fPar[6] = pPDG->Charge() / 3.0 * pi; | |
62 | } | |
63 | } | |
64 | ||
65 | void AliHLTTPCCAMCTrack::SetTPCPar( float X, float Y, float Z, | |
66 | float Px, float Py, float Pz ) | |
67 | { | |
68 | //* Set parameters at TPC entrance | |
69 | ||
70 | for ( int i = 0; i < 7; i++ ) fTPCPar[i] = 0; | |
71 | ||
72 | fTPCPar[0] = X; | |
73 | fTPCPar[1] = Y; | |
74 | fTPCPar[2] = Z; | |
75 | double p = CAMath::Sqrt( Px * Px + Py * Py + Pz * Pz ); | |
76 | double pi = ( p > 1.e-4 ) ? 1. / p : 0; | |
77 | fTPCPar[3] = Px * pi; | |
78 | fTPCPar[4] = Py * pi; | |
79 | fTPCPar[5] = Pz * pi; | |
80 | fTPCPar[6] = 0; | |
81 | if ( CAMath::Abs( fPDG ) < 100000 ) { | |
82 | TParticlePDG *pPDG = TDatabasePDG::Instance()->GetParticle( fPDG ); | |
83 | if ( pPDG ) fTPCPar[6] = pPDG->Charge() / 3.0 * pi; | |
84 | } | |
85 | } |