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enhanced HOMER reader to work on normal buffer
[u/mrichter/AliRoot.git] / PWG1 / AliESDRecV0Info.cxx
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6fc428f0 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// Comparison class for V0 information //
21// responsible:
22// marian.ivanov@cern.ch //
23//
24//
25
26
27
28
29
30#include <stdio.h>
31#include <string.h>
32//ROOT includes
33#include "Rtypes.h"
34//
35//ALIROOT includes
36//
37#include "AliESDtrack.h"
38#include "AliTPCParam.h"
39#include "AliTrackReference.h"
40#include "AliTPCParamSR.h"
41#include "AliESD.h"
42#include "AliESDfriend.h"
43#include "AliESDtrack.h"
44#include "AliTPCseed.h"
45#include "AliITStrackMI.h"
46#include "AliTRDtrack.h"
47#include "AliHelix.h"
48#include "AliESDVertex.h"
49#include "AliExternalTrackParam.h"
50#include "AliESDkink.h"
51#include "AliESDv0.h"
52#include "AliV0.h"
53//
54#include "AliTreeDraw.h"
76472f75 55#include "AliMCInfo.h"
56#include "AliGenKinkInfo.h"
57#include "AliGenV0Info.h"
58
6fc428f0 59
60#include "AliESDRecV0Info.h"
61
62
63
64ClassImp(AliESDRecV0Info)
65
66
67
68
69
70void AliESDRecV0Info::Update(Float_t vertex[3])
71{
72
73 if ( (fT1.fStatus[1]>0)&& (fT2.fStatus[1]>0)){
74 Float_t distance1,distance2;
75 Double_t xx[3],pp[3];
76 //
77 Double_t xd[3],pd[3],signd;
78 Double_t xm[3],pm[3],signm;
79 //
80 //
81 if (fT1.fITSOn&&fT2.fITSOn){
82 for (Int_t i=0;i<3;i++){
83 xd[i] = fT2.fITSinR1[i];
84 pd[i] = fT2.fITSinP1[i];
85 xm[i] = fT1.fITSinR1[i];
86 pm[i] = fT1.fITSinP1[i];
87 }
88 }
89 else{
90
91 for (Int_t i=0;i<3;i++){
92 xd[i] = fT2.fTPCinR1[i];
93 pd[i] = fT2.fTPCinP1[i];
94 xm[i] = fT1.fTPCinR1[i];
95 pm[i] = fT1.fTPCinP1[i];
96 }
97 }
98 //
99 //
100 signd = fT2.fSign<0 ? -1:1;
101 signm = fT1.fSign<0 ? -1:1;
102
103 AliHelix dhelix1(xd,pd,signd);
104 dhelix1.GetMomentum(0,pp,0);
105 dhelix1.Evaluate(0,xx);
106 //
107 // Double_t x2[3],p2[3];
108 //
109 AliHelix mhelix(xm,pm,signm);
110 //
111 //find intersection linear
112 //
113 Double_t phase[2][2],radius[2];
114 Int_t points = dhelix1.GetRPHIintersections(mhelix, phase, radius,200);
115 Double_t delta1=10000,delta2=10000;
116
117 if (points==1){
118 fRs[0] = TMath::Sqrt(radius[0]);
119 fRs[1] = TMath::Sqrt(radius[0]);
120 }
121 if (points==2){
122 fRs[0] =TMath::Min(TMath::Sqrt(radius[0]),TMath::Sqrt(radius[1]));
123 fRs[1] =TMath::Max(TMath::Sqrt(radius[0]),TMath::Sqrt(radius[1]));
124 }
125
126 if (points>0){
127 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
128 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
129 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
130 }
131 if (points==2){
132 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
133 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
134 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
135 }
136 if (points==1){
137 fRs[0] = TMath::Sqrt(radius[0]);
138 fRs[1] = TMath::Sqrt(radius[0]);
139 fDistMinR = delta1;
140 }
141 if (points==2){
142 if (radius[0]<radius[1]){
143 fRs[0] = TMath::Sqrt(radius[0]);
144 fRs[1] = TMath::Sqrt(radius[1]);
145 fDistMinR = delta1;
146 }
147 else{
148 fRs[0] = TMath::Sqrt(radius[1]);
149 fRs[1] = TMath::Sqrt(radius[0]);
150 fDistMinR = delta2;
151 }
152 }
153 //
154 //
155 distance1 = TMath::Min(delta1,delta2);
156 //
157 //find intersection parabolic
158 //
159 points = dhelix1.GetRPHIintersections(mhelix, phase, radius);
160 delta1=10000,delta2=10000;
161
162 if (points>0){
163 dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
164 }
165 if (points==2){
166 dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
167 }
168
169 distance2 = TMath::Min(delta1,delta2);
170 if (distance2>100) fDist2 =100;
171 return;
172 if (delta1<delta2){
173 //get V0 info
174 dhelix1.Evaluate(phase[0][0],fXr);
175 dhelix1.GetMomentum(phase[0][0],fPdr);
176 mhelix.GetMomentum(phase[0][1],fPm);
177 dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle);
178 fRr = TMath::Sqrt(radius[0]);
179 }
180 else{
181 dhelix1.Evaluate(phase[1][0],fXr);
182 dhelix1.GetMomentum(phase[1][0], fPdr);
183 mhelix.GetMomentum(phase[1][1], fPm);
184 dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle);
185 fRr = TMath::Sqrt(radius[1]);
186 }
187 fDist1 = TMath::Sqrt(distance1);
188 fDist2 = TMath::Sqrt(distance2);
189
190 if (fDist2<10.5){
191 Double_t x,alpha,param[5],cov[15];
192 //
193 fT1.GetESDtrack()->GetInnerExternalParameters(alpha,x,param);
194 fT1.GetESDtrack()->GetInnerExternalCovariance(cov);
195 AliExternalTrackParam paramm(x,alpha,param,cov);
196 //
197 fT2.GetESDtrack()->GetInnerExternalParameters(alpha,x,param);
198 fT2.GetESDtrack()->GetInnerExternalCovariance(cov);
199 AliExternalTrackParam paramd(x,alpha,param,cov);
200 }
201 //
202 //
203
204 Float_t v[3] = {fXr[0]-vertex[0],fXr[1]-vertex[1],fXr[2]-vertex[2]};
205 Float_t p[3] = {fPdr[0]+fPm[0], fPdr[1]+fPm[1],fPdr[2]+fPm[2]};
206
207 Float_t vnorm2 = v[0]*v[0]+v[1]*v[1];
208 Float_t vnorm3 = TMath::Sqrt(v[2]*v[2]+vnorm2);
209 vnorm2 = TMath::Sqrt(vnorm2);
210 Float_t pnorm2 = p[0]*p[0]+p[1]*p[1];
211 Float_t pnorm3 = TMath::Sqrt(p[2]*p[2]+pnorm2);
212 pnorm2 = TMath::Sqrt(pnorm2);
213
214 fPointAngleFi = (v[0]*p[0]+v[1]*p[1])/(vnorm2*pnorm2);
215 fPointAngleTh = (v[2]*p[2]+vnorm2*pnorm2)/(vnorm3*pnorm3);
216 fPointAngle = (v[0]*p[0]+v[1]*p[1]+v[2]*p[2])/(vnorm3*pnorm3);
217 }
218}
219