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aab9c8d5 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
0742d588 | 16 | /* $Id$ */ |
116cbefd | 17 | |
2cad796f | 18 | #include "TVirtualMC.h" |
0742d588 | 19 | |
2d74ba4f | 20 | #include "AliRun.h" |
0742d588 | 21 | #include "AliTrackReference.h" |
ac3eaff4 | 22 | #include "AliExternalTrackParam.h" |
23 | #include "AliKalmanTrack.h" | |
2d74ba4f | 24 | |
25 | // | |
26 | // Track Reference object is created every time particle is | |
27 | // crossing detector bounds. The object is created by Step Manager | |
28 | // | |
29 | // The class stores the following informations: | |
30 | // track label, | |
31 | // track position: X,Y,X | |
32 | // track momentum px, py, pz | |
33 | // track length and time of fligth: both in cm | |
34 | // status bits from Monte Carlo | |
35 | // | |
36 | ||
aab9c8d5 | 37 | |
38 | ClassImp(AliTrackReference) | |
39 | ||
e2afb3b6 | 40 | //_______________________________________________________________________ |
41 | AliTrackReference::AliTrackReference(): | |
448312df | 42 | TObject(), |
e2afb3b6 | 43 | fTrack(0), |
44 | fX(0), | |
45 | fY(0), | |
46 | fZ(0), | |
47 | fPx(0), | |
48 | fPy(0), | |
49 | fPz(0), | |
448312df | 50 | fLength(0), |
3142ebc3 | 51 | fTime(0), |
52 | fUserId(0) | |
aab9c8d5 | 53 | { |
54 | // | |
55 | // Default constructor | |
2d74ba4f | 56 | // Creates empty object |
57 | ||
58 | for(Int_t i=0; i<16; i++) ResetBit(BIT(i)); | |
59 | } | |
60 | ||
61 | //_______________________________________________________________________ | |
448312df | 62 | AliTrackReference::AliTrackReference(Int_t label) : |
90e48c0c | 63 | TObject(), |
64 | fTrack(label), | |
65 | fX(0), | |
66 | fY(0), | |
67 | fZ(0), | |
68 | fPx(0), | |
69 | fPy(0), | |
70 | fPz(0), | |
71 | fLength(gMC->TrackLength()), | |
3142ebc3 | 72 | fTime(gMC->TrackTime()), |
73 | fUserId(0) | |
448312df | 74 | { |
2d74ba4f | 75 | // |
76 | // Create Reference object out of label and | |
77 | // data in TVirtualMC object | |
78 | // | |
79 | // Creates an object and fill all parameters | |
80 | // from data in VirtualMC | |
aab9c8d5 | 81 | // |
2d74ba4f | 82 | // Sylwester Radomski, (S.Radomski@gsi.de) |
83 | // GSI, Jan 31, 2003 | |
84 | // | |
2cad796f | 85 | |
90e48c0c | 86 | Double_t vec[4]; |
2d74ba4f | 87 | |
90e48c0c | 88 | gMC->TrackPosition(vec[0],vec[1],vec[2]); |
2d74ba4f | 89 | |
90 | fX = vec[0]; | |
91 | fY = vec[1]; | |
92 | fZ = vec[2]; | |
93 | ||
90e48c0c | 94 | gMC->TrackMomentum(vec[0],vec[1],vec[2],vec[3]); |
2d74ba4f | 95 | |
96 | fPx = vec[0]; | |
97 | fPy = vec[1]; | |
b745fc4c | 98 | fPz = vec[2]; |
2d74ba4f | 99 | |
100 | // Set Up status code | |
101 | // Copy Bits from virtual MC | |
102 | ||
103 | for(Int_t i=0; i<16; i++) ResetBit(BIT(i)); | |
104 | ||
2cad796f | 105 | SetBit(BIT(0), gMC->IsNewTrack()); |
106 | SetBit(BIT(1), gMC->IsTrackAlive()); | |
107 | SetBit(BIT(2), gMC->IsTrackDisappeared()); | |
108 | SetBit(BIT(3), gMC->IsTrackEntering()); | |
109 | SetBit(BIT(4), gMC->IsTrackExiting()); | |
110 | SetBit(BIT(5), gMC->IsTrackInside()); | |
111 | SetBit(BIT(6), gMC->IsTrackOut()); | |
112 | SetBit(BIT(7), gMC->IsTrackStop()); | |
aab9c8d5 | 113 | } |
2d74ba4f | 114 | //_______________________________________________________________________ |
ac3eaff4 | 115 | AliExternalTrackParam * AliTrackReference::MakeTrack(const AliTrackReference *ref, Double_t mass) |
116 | { | |
117 | // | |
118 | // Make dummy track from the track reference | |
119 | // negative mass means opposite charge | |
120 | // | |
121 | Double_t xx[5]; | |
122 | Double_t cc[15]; | |
123 | for (Int_t i=0;i<15;i++) cc[i]=0; | |
124 | Double_t x = ref->X(), y = ref->Y(), z = ref->Z(); | |
125 | Double_t alpha = TMath::ATan2(y,x); | |
126 | Double_t xr = TMath::Sqrt(x*x+y*y); | |
b31d3cd8 | 127 | xx[0] = ref->LocalY(); |
ac3eaff4 | 128 | xx[1] = z; |
129 | xx[3] = ref->Pz()/ref->Pt(); | |
c9ec41e8 | 130 | xx[4] = 1./ref->Pt(); |
ac3eaff4 | 131 | if (mass<0) xx[4]*=-1.; // negative mass - negative direction |
132 | Double_t alphap = TMath::ATan2(ref->Py(),ref->Px())-alpha; | |
133 | if (alphap> TMath::Pi()) alphap-=TMath::Pi(); | |
134 | if (alphap<-TMath::Pi()) alphap+=TMath::Pi(); | |
135 | xx[2] = TMath::Sin(alphap); | |
c9ec41e8 | 136 | |
ac3eaff4 | 137 | AliExternalTrackParam * track = new AliExternalTrackParam(xr,alpha,xx,cc); |
ac3eaff4 | 138 | return track; |
139 | } | |
140 | ||
141 |