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5c7ef659 | 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 | ||
16 | ||
17 | /////////////////////////////////////////////////////////////////////////// | |
18 | /* | |
19 | ||
20 | Origin: marian.ivanov@cern.ch | |
21 | Container classes with MC infomation | |
22 | ||
23 | */ | |
24 | ||
25 | #if !defined(__CINT__) || defined(__MAKECINT__) | |
26 | #include <stdio.h> | |
27 | #include <string.h> | |
28 | //ROOT includes | |
29 | #include "TROOT.h" | |
30 | #include "Rtypes.h" | |
31 | #include "TFile.h" | |
32 | #include "TTree.h" | |
33 | #include "TChain.h" | |
34 | #include "TCut.h" | |
35 | #include "TString.h" | |
36 | #include "TStopwatch.h" | |
37 | #include "TParticle.h" | |
38 | #include "TSystem.h" | |
39 | #include "TCanvas.h" | |
40 | #include "TGeometry.h" | |
41 | #include "TPolyLine3D.h" | |
42 | ||
43 | //ALIROOT includes | |
44 | #include "AliRun.h" | |
45 | #include "AliStack.h" | |
46 | #include "AliSimDigits.h" | |
47 | #include "AliTPCParam.h" | |
48 | #include "AliTPC.h" | |
49 | #include "AliTPCLoader.h" | |
50 | #include "AliDetector.h" | |
51 | #include "AliTrackReference.h" | |
52 | #include "AliTPCParamSR.h" | |
53 | #include "AliTracker.h" | |
54 | #include "AliMagF.h" | |
55 | #include "AliHelix.h" | |
56 | #include "AliTrackPointArray.h" | |
57 | ||
58 | #endif | |
59 | #include "AliGenKinkInfo.h" | |
60 | ||
61 | // | |
62 | // | |
63 | ||
64 | ClassImp(AliGenKinkInfo) | |
65 | ||
66 | ||
67 | ||
68 | ///////////////////////////////////////////////////////////////////////////////// | |
69 | ||
70 | AliGenKinkInfo::AliGenKinkInfo(): | |
71 | fMCd(), //info about daughter particle - second particle for V0 | |
72 | fMCm(), //info about mother particle - first particle for V0 | |
73 | fMCDist1(0), //info about closest distance according closest MC - linear DCA | |
74 | fMCDist2(0), //info about closest distance parabolic DCA | |
75 | fMCRr(0), // rec position of the vertex | |
76 | fMCR(0) //exact r position of the vertex | |
77 | { | |
78 | // | |
79 | // default constructor | |
80 | // | |
81 | for (Int_t i=0;i<3;i++){ | |
82 | fMCPdr[i]=0; | |
83 | fMCPd[i]=0; | |
84 | fMCX[i]=0; | |
85 | fMCPm[i]=0; | |
86 | fMCAngle[i]=0; | |
87 | } | |
88 | for (Int_t i=0; i<2; i++) { | |
89 | fPdg[i]= 0; | |
90 | fLab[i]=0; | |
91 | } | |
92 | } | |
93 | ||
94 | void AliGenKinkInfo::Update() | |
95 | { | |
96 | // | |
97 | // Update information | |
98 | // some redundancy - faster acces to the values in analysis code | |
99 | // | |
100 | fMCPd[0] = fMCd.GetParticle().Px(); | |
101 | fMCPd[1] = fMCd.GetParticle().Py(); | |
102 | fMCPd[2] = fMCd.GetParticle().Pz(); | |
103 | fMCPd[3] = fMCd.GetParticle().P(); | |
104 | // | |
105 | fMCX[0] = fMCd.GetParticle().Vx(); | |
106 | fMCX[1] = fMCd.GetParticle().Vy(); | |
107 | fMCX[2] = fMCd.GetParticle().Vz(); | |
108 | fMCR = TMath::Sqrt( fMCX[0]*fMCX[0]+fMCX[1]*fMCX[1]); | |
109 | // | |
110 | fPdg[0] = fMCd.GetParticle().GetPdgCode(); | |
111 | fPdg[1] = fMCm.GetParticle().GetPdgCode(); | |
112 | // | |
113 | fLab[0] = fMCd.GetParticle().GetUniqueID(); | |
114 | fLab[1] = fMCm.GetParticle().GetUniqueID(); | |
115 | // | |
116 | // | |
117 | // | |
118 | Double_t x1[3],p1[3]; | |
119 | TParticle& pdaughter = fMCd.GetParticle(); | |
120 | x1[0] = pdaughter.Vx(); | |
121 | x1[1] = pdaughter.Vy(); | |
122 | x1[2] = pdaughter.Vz(); | |
123 | p1[0] = pdaughter.Px(); | |
124 | p1[1] = pdaughter.Py(); | |
125 | p1[2] = pdaughter.Pz(); | |
126 | Double_t sign = (pdaughter.GetPDG()->Charge()>0)? -1:1; | |
127 | AliHelix dhelix1(x1,p1,sign); | |
128 | // | |
129 | // | |
130 | Double_t x2[3],p2[3]; | |
131 | // | |
132 | TParticle& pmother = fMCm.GetParticle(); | |
133 | x2[0] = pmother.Vx(); | |
134 | x2[1] = pmother.Vy(); | |
135 | x2[2] = pmother.Vz(); | |
136 | p2[0] = pmother.Px(); | |
137 | p2[1] = pmother.Py(); | |
138 | p2[2] = pmother.Pz(); | |
139 | // | |
140 | const AliTrackReference & pdecay = fMCm.GetTRdecay(); | |
141 | x2[0] = pdecay.X(); | |
142 | x2[1] = pdecay.Y(); | |
143 | x2[2] = pdecay.Z(); | |
144 | p2[0] = pdecay.Px(); | |
145 | p2[1] = pdecay.Py(); | |
146 | p2[2] = pdecay.Pz(); | |
147 | // | |
148 | sign = (pmother.GetPDG()->Charge()>0) ? -1:1; | |
149 | AliHelix mhelix(x2,p2,sign); | |
150 | ||
151 | // | |
152 | // | |
153 | // | |
154 | //find intersection linear | |
155 | // | |
156 | Double_t distance1, distance2; | |
157 | Double_t phase[2][2],radius[2]; | |
158 | Int_t points = dhelix1.GetRPHIintersections(mhelix, phase, radius); | |
159 | Double_t delta1=10000,delta2=10000; | |
160 | if (points>0){ | |
161 | dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
162 | dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
163 | dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
164 | } | |
165 | if (points==2){ | |
166 | dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
167 | dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
168 | dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
169 | } | |
170 | distance1 = TMath::Min(delta1,delta2); | |
171 | // | |
172 | //find intersection parabolic | |
173 | // | |
174 | points = dhelix1.GetRPHIintersections(mhelix, phase, radius); | |
175 | delta1=10000,delta2=10000; | |
176 | ||
177 | if (points>0){ | |
178 | dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
179 | } | |
180 | if (points==2){ | |
181 | dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
182 | } | |
183 | ||
184 | distance2 = TMath::Min(delta1,delta2); | |
185 | // | |
186 | if (delta1<delta2){ | |
187 | //get V0 info | |
188 | dhelix1.Evaluate(phase[0][0],fMCXr); | |
189 | dhelix1.GetMomentum(phase[0][0],fMCPdr); | |
190 | mhelix.GetMomentum(phase[0][1],fMCPm); | |
191 | dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],fMCAngle); | |
192 | fMCRr = TMath::Sqrt(radius[0]); | |
193 | } | |
194 | else{ | |
195 | dhelix1.Evaluate(phase[1][0],fMCXr); | |
196 | dhelix1.GetMomentum(phase[1][0],fMCPdr); | |
197 | mhelix.GetMomentum(phase[1][1],fMCPm); | |
198 | dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],fMCAngle); | |
199 | fMCRr = TMath::Sqrt(radius[1]); | |
200 | } | |
201 | // | |
202 | // | |
203 | fMCDist1 = TMath::Sqrt(distance1); | |
204 | fMCDist2 = TMath::Sqrt(distance2); | |
205 | ||
206 | } | |
207 | ||
208 | ||
209 | Float_t AliGenKinkInfo::GetQt(){ | |
210 | // | |
211 | // | |
212 | Float_t momentumd = TMath::Sqrt(fMCPd[0]*fMCPd[0]+fMCPd[1]*fMCPd[1]+fMCPd[2]*fMCPd[2]); | |
213 | return TMath::Sin(fMCAngle[2])*momentumd; | |
214 | } | |
215 | ||
216 |