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2a14a7b1 | 1 | /************************************************************************* |
2 | * Copyright(c) 1998-2009, 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 | /////////////////////////////////////////////////////////////////////////// | |
17 | // Dielectron TrackRotator // | |
18 | // // | |
19 | // // | |
20 | /* | |
21 | Detailed description | |
22 | ||
23 | ||
24 | */ | |
25 | // // | |
26 | /////////////////////////////////////////////////////////////////////////// | |
27 | ||
28 | #include <TMath.h> | |
2a14a7b1 | 29 | #include <TRandom3.h> |
1201a1a9 | 30 | #include <TObjArray.h> |
31 | ||
32 | #include <AliVTrack.h> | |
33 | ||
34 | #include "AliDielectronHelper.h" | |
2a14a7b1 | 35 | |
36 | #include "AliDielectronTrackRotator.h" | |
37 | ||
38 | ClassImp(AliDielectronTrackRotator) | |
39 | ||
40 | AliDielectronTrackRotator::AliDielectronTrackRotator() : | |
41 | TNamed(), | |
42 | fIterations(1), | |
43 | fRotationType(kRotateBothRandom), | |
44 | fStartAnglePhi(TMath::Pi()), | |
45 | fConeAnglePhi(TMath::Pi()/6.), | |
46 | fkArrTracksP(0x0), | |
47 | fkArrTracksN(0x0), | |
48 | fCurrentIteration(0), | |
49 | fCurrentTackP(0), | |
50 | fCurrentTackN(0), | |
1201a1a9 | 51 | fEvent(0x0), |
52 | fTrackP(), | |
53 | fTrackN(), | |
54 | fVTrackP(0x0), | |
55 | fVTrackN(0x0), | |
56 | fPdgLeg1(-11), | |
57 | fPdgLeg2(11) | |
2a14a7b1 | 58 | { |
59 | // | |
60 | // Default Constructor | |
61 | // | |
62 | gRandom->SetSeed(); | |
63 | } | |
64 | ||
65 | //______________________________________________ | |
66 | AliDielectronTrackRotator::AliDielectronTrackRotator(const char* name, const char* title) : | |
67 | TNamed(name, title), | |
68 | fIterations(1), | |
69 | fRotationType(kRotateBothRandom), | |
70 | fStartAnglePhi(TMath::Pi()), | |
71 | fConeAnglePhi(TMath::Pi()/6.), | |
72 | fkArrTracksP(0x0), | |
73 | fkArrTracksN(0x0), | |
74 | fCurrentIteration(0), | |
75 | fCurrentTackP(0), | |
76 | fCurrentTackN(0), | |
1201a1a9 | 77 | fEvent(0x0), |
78 | fTrackP(), | |
79 | fTrackN(), | |
80 | fVTrackP(0x0), | |
81 | fVTrackN(0x0), | |
82 | fPdgLeg1(-11), | |
83 | fPdgLeg2(11) | |
2a14a7b1 | 84 | { |
85 | // | |
86 | // Named Constructor | |
87 | // | |
88 | gRandom->SetSeed(); | |
89 | } | |
90 | ||
91 | //______________________________________________ | |
92 | AliDielectronTrackRotator::~AliDielectronTrackRotator() | |
93 | { | |
94 | // | |
95 | // Default Destructor | |
96 | // | |
97 | ||
98 | } | |
99 | ||
100 | //______________________________________________ | |
101 | void AliDielectronTrackRotator::Reset() | |
102 | { | |
103 | // | |
104 | // Reset the current iterators | |
105 | // | |
106 | fCurrentIteration=0; | |
107 | fCurrentTackP=0; | |
108 | fCurrentTackN=0; | |
109 | } | |
110 | ||
111 | //______________________________________________ | |
112 | Bool_t AliDielectronTrackRotator::NextCombination() | |
113 | { | |
114 | // | |
115 | // Perform track rotation of the tracks in the track arrays as long as there are possible combinations | |
116 | // | |
117 | if (!fkArrTracksP || !fkArrTracksP) { | |
118 | Reset(); | |
119 | return kFALSE; | |
120 | } | |
121 | ||
122 | Int_t nP=fkArrTracksP->GetEntriesFast(); | |
123 | Int_t nN=fkArrTracksN->GetEntriesFast(); | |
124 | if (nP==0||nN==0){ | |
125 | Reset(); | |
126 | return kFALSE; | |
127 | } | |
128 | ||
129 | if (fCurrentIteration==fIterations){ | |
130 | fCurrentIteration=0; | |
131 | ++fCurrentTackP; | |
132 | } | |
133 | ||
134 | if (fCurrentTackP==nP){ | |
135 | ++fCurrentTackN; | |
136 | fCurrentTackP=0; | |
137 | } | |
138 | ||
139 | if (fCurrentTackN==nN){ | |
140 | Reset(); | |
141 | return kFALSE; | |
142 | } | |
143 | ||
144 | if (!RotateTracks()){ | |
145 | Reset(); | |
146 | return kFALSE; | |
147 | } | |
148 | ||
149 | ++fCurrentIteration; | |
150 | return kTRUE; | |
151 | } | |
152 | ||
153 | //______________________________________________ | |
154 | Bool_t AliDielectronTrackRotator::RotateTracks() | |
155 | { | |
156 | // | |
157 | // Actual track rotation | |
158 | // Find out particle type and perform the rotation | |
159 | // | |
ffbede40 | 160 | |
1201a1a9 | 161 | AliVTrack *trackP=dynamic_cast<AliVTrack*>(fkArrTracksP->UncheckedAt(fCurrentTackP)); |
162 | AliVTrack *trackN=dynamic_cast<AliVTrack*>(fkArrTracksN->UncheckedAt(fCurrentTackN)); | |
163 | fTrackP.Initialize(); | |
164 | fTrackN.Initialize(); | |
165 | fVTrackP=0x0; | |
166 | fVTrackN=0x0; | |
2a14a7b1 | 167 | if (!trackP||!trackN) return kFALSE; |
1201a1a9 | 168 | fTrackP+=AliKFParticle(*trackP,fPdgLeg1); |
169 | fTrackN+=AliKFParticle(*trackN,fPdgLeg2); | |
2a14a7b1 | 170 | |
1201a1a9 | 171 | fVTrackP=trackP; |
172 | fVTrackN=trackN; | |
2a14a7b1 | 173 | |
174 | Double_t angle = fStartAnglePhi+(2*gRandom->Rndm()-1)*fConeAnglePhi; | |
175 | Int_t charge = TMath::Nint(gRandom->Rndm()); | |
176 | ||
1201a1a9 | 177 | if (fRotationType==kRotatePositive||(fRotationType==kRotateBothRandom&&charge==0)){ |
178 | AliDielectronHelper::RotateKFParticle(&fTrackP, angle, fEvent); | |
179 | } | |
180 | ||
181 | if (fRotationType==kRotateNegative||(fRotationType==kRotateBothRandom&&charge==1)){ | |
182 | AliDielectronHelper::RotateKFParticle(&fTrackN, angle, fEvent); | |
2a14a7b1 | 183 | } |
184 | ||
185 | return kTRUE; | |
186 | } |