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415d9f5c | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-2007, 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 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //------------------------------------------------------------------------- | |
19 | // Realisation of AliVParticle for MC Particles | |
20 | // Implementation wraps a TParticle and delegates the methods | |
21 | // Author: Andreas Morsch, CERN | |
22 | //------------------------------------------------------------------------- | |
23 | ||
93df0e9b | 24 | #include <TRefArray.h> |
25 | ||
415d9f5c | 26 | #include "AliMCParticle.h" |
7162633f | 27 | #include "AliExternalTrackParam.h" |
415d9f5c | 28 | |
29 | ||
30 | ClassImp(AliMCParticle) | |
31 | ||
32 | AliMCParticle::AliMCParticle(): | |
33 | AliVParticle(), | |
93df0e9b | 34 | fParticle(0), |
35 | fTrackReferences(0), | |
eee13e8d | 36 | fNTrackRef(0), |
93836e1b | 37 | fLabel(-1), |
38 | fMother(-1), | |
39 | fFirstDaughter(-1), | |
40 | fLastDaughter(-1) | |
415d9f5c | 41 | { |
42 | // Constructor | |
43 | } | |
44 | ||
eee13e8d | 45 | |
46 | AliMCParticle::AliMCParticle(TParticle* part, TRefArray* rarray, Int_t index): | |
415d9f5c | 47 | AliVParticle(), |
93df0e9b | 48 | fParticle(part), |
49 | fTrackReferences(rarray), | |
eee13e8d | 50 | fNTrackRef(0), |
93836e1b | 51 | fLabel(index), |
52 | fMother(-1), | |
53 | fFirstDaughter(-1), | |
54 | fLastDaughter(-1) | |
415d9f5c | 55 | { |
56 | // Constructor | |
93df0e9b | 57 | if (rarray != 0) { |
f1ac8a97 | 58 | fNTrackRef = fTrackReferences->GetEntriesFast(); |
93df0e9b | 59 | } |
415d9f5c | 60 | } |
61 | ||
62 | ||
63 | AliMCParticle::AliMCParticle(const AliMCParticle& mcPart) : | |
64 | AliVParticle(mcPart), | |
f1ac8a97 | 65 | fParticle(0), |
66 | fTrackReferences(0), | |
eee13e8d | 67 | fNTrackRef(0), |
93836e1b | 68 | fLabel(-1), |
69 | fMother(-1), | |
70 | fFirstDaughter(-1), | |
71 | fLastDaughter(-1) | |
415d9f5c | 72 | { |
73 | // Copy constructor | |
74 | } | |
75 | ||
76 | AliMCParticle& AliMCParticle::operator=(const AliMCParticle& mcPart) | |
f1ac8a97 | 77 | { |
78 | ||
79 | if (this!=&mcPart) { | |
80 | AliVParticle::operator=(mcPart); | |
415d9f5c | 81 | } |
82 | ||
83 | return *this; | |
84 | } | |
f1ac8a97 | 85 | |
86 | AliMCParticle::~AliMCParticle() | |
87 | { | |
88 | // delete the track references passed externally | |
89 | // fParticle should be handled by the user | |
90 | // AliStack in case of AliMCEventHandler | |
91 | if(fTrackReferences){ | |
09e1eaf8 | 92 | fTrackReferences->Delete(); |
93 | delete fTrackReferences; | |
94 | fTrackReferences = 0; | |
f1ac8a97 | 95 | } |
96 | } | |
97 | ||
98 | ||
99 | ||
7162633f | 100 | Float_t AliMCParticle::GetTPCTrackLength(Float_t bz, Float_t ptmin, Int_t &counter, Float_t deadWidth){ |
101 | // | |
102 | // return track length in geometrically active volume of TPC. | |
103 | // z nad rphi acceptance is included | |
104 | // doesn't take into account dead channel and ExB | |
105 | // Intput: | |
106 | // trackRefs | |
107 | // bz - magnetic field | |
108 | // deadWidth - dead zone in r-phi | |
109 | // Additional output: | |
110 | // counter - number of circles | |
ddb84c3f | 111 | |
112 | if (fNTrackRef == 0) return 0.; | |
113 | ||
7162633f | 114 | const Float_t kRMin = 90; |
115 | const Float_t kRMax = 245; | |
116 | const Float_t kZMax = 250; | |
117 | const Float_t kMinPt= ptmin; | |
ddb84c3f | 118 | |
7162633f | 119 | Float_t length =0; |
120 | Int_t nrefs = fNTrackRef; | |
ddb84c3f | 121 | |
122 | ||
7162633f | 123 | AliExternalTrackParam param; |
124 | Double_t cv[21]; | |
125 | for (Int_t i = 0; i < 21; i++) cv[i]=0; | |
126 | counter=0; | |
127 | // | |
128 | // | |
ddb84c3f | 129 | |
7162633f | 130 | AliTrackReference *ref0 = (AliTrackReference*) (fTrackReferences->At(0)); |
131 | Float_t direction = 0; | |
132 | // | |
133 | for (Int_t iref = 1; iref < nrefs; iref++){ | |
134 | AliTrackReference *ref = (AliTrackReference*) (fTrackReferences->At(iref)); | |
135 | if (!ref) continue; | |
136 | if (!ref0 || ref0->DetectorId()!= AliTrackReference::kTPC){ | |
137 | ref0 = ref; | |
138 | direction = ((ref0->X() * ref0->Px() + ref0->Y() * ref0->Py()) > 0)? 1. : -1.; | |
139 | continue; | |
140 | } | |
141 | ||
142 | Float_t newdirection = ((ref->X() * ref->Px() + ref->Y() * ref->Py()) > 0)? 1. : -1.; | |
143 | if (newdirection*direction<0) { | |
144 | counter++; //circle counter | |
145 | direction = newdirection; | |
146 | continue; | |
147 | } | |
148 | if (counter>0) continue; | |
149 | if (ref0->Pt() < kMinPt) break; | |
150 | Float_t radius0 = TMath::Max(TMath::Min(ref0->R(),kRMax),kRMin);; | |
151 | Float_t radius1 = TMath::Max(TMath::Min(ref->R(),kRMax),kRMin); | |
152 | Double_t xyz[3] = {ref0->X(), ref0->Y(), ref0->Z()}; | |
153 | Double_t pxyz[3]= {ref0->Px(), ref0->Py(), ref0->Pz()}; | |
154 | Double_t alpha; | |
155 | param.Set(xyz,pxyz,cv,TMath::Nint(fParticle->GetPDG()->Charge()/3.)); | |
156 | ||
157 | for (Float_t radius = radius0; radius < radius1; radius+=1){ | |
158 | param.GetXYZAt(radius, bz, xyz); | |
159 | if (TMath::Abs(xyz[2]) > kZMax) continue; | |
160 | Float_t gradius = TMath::Sqrt(xyz[1] * xyz[1] + xyz[0] * xyz[0]); | |
161 | if (gradius > kRMax) continue; | |
162 | alpha = TMath::ATan2(xyz[1],xyz[0]); | |
163 | if (alpha<0) alpha += TMath::TwoPi(); | |
164 | // | |
165 | Int_t sector = Int_t(9 * alpha / TMath::Pi()); | |
166 | Float_t lalpha = alpha - ((sector + 0.5) * TMath::Pi() / 9.); | |
167 | Float_t dedge = (TMath::Tan(TMath::Pi() / 18.) - TMath::Abs(TMath::Tan(lalpha))) * gradius; | |
168 | if (dedge>deadWidth) length++; | |
169 | } | |
170 | if (ref->DetectorId()!= AliTrackReference::kTPC) break; | |
171 | ref0 = ref; | |
172 | } | |
173 | return length; | |
174 | } |