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6c94f330 | 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 | // Implementation of the V0 vertex class | |
19 | // Numerical part - AliHelix functionality used | |
20 | // | |
21 | // Origin: Marian Ivanov marian.ivanov@cern.ch | |
22 | //------------------------------------------------------------------------- | |
23 | #include <TMath.h> | |
24 | ||
25 | #include "AliV0.h" | |
26 | #include "AliHelix.h" | |
27 | ||
28 | ||
29 | ClassImp(AliV0) | |
30 | ||
31 | void AliV0::Update(Float_t vertex[3]) | |
32 | { | |
33 | // | |
34 | // updates Kink Info | |
35 | // | |
36 | // Float_t distance1,distance2; | |
37 | Float_t distance2; | |
38 | // | |
39 | AliHelix phelix(fParamP); | |
d6a49f20 | 40 | AliHelix mhelix(fParamN); |
6c94f330 | 41 | // |
42 | //find intersection linear | |
43 | // | |
44 | Double_t phase[2][2],radius[2]; | |
45 | Int_t points = phelix.GetRPHIintersections(mhelix, phase, radius,200); | |
46 | Double_t delta1=10000,delta2=10000; | |
47 | /* | |
48 | if (points<=0) return; | |
49 | if (points>0){ | |
50 | phelix.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
51 | phelix.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
52 | phelix.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
53 | } | |
54 | if (points==2){ | |
55 | phelix.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
56 | phelix.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
57 | phelix.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
58 | } | |
59 | distance1 = TMath::Min(delta1,delta2); | |
60 | */ | |
61 | // | |
62 | //find intersection parabolic | |
63 | // | |
64 | points = phelix.GetRPHIintersections(mhelix, phase, radius); | |
65 | delta1=10000,delta2=10000; | |
66 | Double_t d1=1000.,d2=10000.; | |
67 | Double_t err[3],angles[3]; | |
68 | if (points<=0) return; | |
69 | if (points>0){ | |
70 | phelix.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
71 | phelix.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
d6a49f20 | 72 | if (TMath::Abs(fParamP.GetX()-TMath::Sqrt(radius[0])<3) && TMath::Abs(fParamN.GetX()-TMath::Sqrt(radius[0])<3)){ |
6c94f330 | 73 | // if we are close to vertex use error parama |
74 | // | |
d6a49f20 | 75 | err[1] = fParamP.GetCovariance()[0]+fParamN.GetCovariance()[0]+0.05*0.05 |
76 | +0.3*(fParamP.GetCovariance()[2]+fParamN.GetCovariance()[2]); | |
77 | err[2] = fParamP.GetCovariance()[2]+fParamN.GetCovariance()[2]+0.05*0.05 | |
78 | +0.3*(fParamP.GetCovariance()[0]+fParamN.GetCovariance()[0]); | |
6c94f330 | 79 | |
80 | phelix.GetAngle(phase[0][0],mhelix,phase[0][1],angles); | |
81 | Double_t tfi = TMath::Abs(TMath::Tan(angles[0])); | |
82 | Double_t tlam = TMath::Abs(TMath::Tan(angles[1])); | |
83 | err[0] = err[1]/((0.2+tfi)*(0.2+tfi))+err[2]/((0.2+tlam)*(0.2+tlam)); | |
84 | err[0] = ((err[1]*err[2]/((0.2+tfi)*(0.2+tfi)*(0.2+tlam)*(0.2+tlam))))/err[0]; | |
85 | phelix.ParabolicDCA2(mhelix,phase[0][0],phase[0][1],radius[0],delta1,err); | |
86 | } | |
87 | Double_t xd[3],xm[3]; | |
88 | phelix.Evaluate(phase[0][0],xd); | |
89 | mhelix.Evaluate(phase[0][1],xm); | |
90 | d1 = (xd[0]-xm[0])*(xd[0]-xm[0])+(xd[1]-xm[1])*(xd[1]-xm[1])+(xd[2]-xm[2])*(xd[2]-xm[2]); | |
91 | } | |
92 | if (points==2){ | |
93 | phelix.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
94 | phelix.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
d6a49f20 | 95 | if (TMath::Abs(fParamP.GetX()-TMath::Sqrt(radius[1])<3) && TMath::Abs(fParamN.GetX()-TMath::Sqrt(radius[1])<3)){ |
6c94f330 | 96 | // if we are close to vertex use error paramatrization |
97 | // | |
d6a49f20 | 98 | err[1] = fParamP.GetCovariance()[0]+fParamN.GetCovariance()[0]+0.05*0.05 |
99 | +0.3*(fParamP.GetCovariance()[2]+fParamN.GetCovariance()[2]); | |
100 | err[2] = fParamP.GetCovariance()[2]+fParamN.GetCovariance()[2]+0.05*0.05 | |
101 | +0.3*(fParamP.GetCovariance()[0]+fParamN.GetCovariance()[0]); | |
6c94f330 | 102 | |
103 | phelix.GetAngle(phase[1][0],mhelix,phase[1][1],angles); | |
104 | Double_t tfi = TMath::Abs(TMath::Tan(angles[0])); | |
105 | Double_t tlam = TMath::Abs(TMath::Tan(angles[1])); | |
106 | err[0] = err[1]/((0.2+tfi)*(0.2+tfi))+err[2]/((0.2+tlam)*(0.2+tlam)); | |
107 | err[0] = ((err[1]*err[2]/((0.2+tfi)*(0.2+tfi)*(0.2+tlam)*(0.2+tlam))))/err[0]; | |
108 | phelix.ParabolicDCA2(mhelix,phase[1][0],phase[1][1],radius[1],delta2,err); | |
109 | } | |
110 | Double_t xd[3],xm[3]; | |
111 | phelix.Evaluate(phase[1][0],xd); | |
112 | mhelix.Evaluate(phase[1][1],xm); | |
113 | d2 = (xd[0]-xm[0])*(xd[0]-xm[0])+(xd[1]-xm[1])*(xd[1]-xm[1])+(xd[2]-xm[2])*(xd[2]-xm[2]); | |
114 | } | |
115 | // | |
116 | distance2 = TMath::Min(delta1,delta2); | |
117 | if (delta1<delta2){ | |
118 | //get V0 info | |
119 | Double_t xd[3],xm[3]; | |
120 | phelix.Evaluate(phase[0][0],xd); | |
121 | mhelix.Evaluate(phase[0][1], xm); | |
b75d63a7 | 122 | fPos[0] = 0.5*(xd[0]+xm[0]); |
123 | fPos[1] = 0.5*(xd[1]+xm[1]); | |
124 | fPos[2] = 0.5*(xd[2]+xm[2]); | |
6c94f330 | 125 | |
d6a49f20 | 126 | Float_t wy = fParamP.GetCovariance()[0]/(fParamP.GetCovariance()[0]+fParamN.GetCovariance()[0]); |
127 | Float_t wz = fParamP.GetCovariance()[2]/(fParamP.GetCovariance()[2]+fParamN.GetCovariance()[2]); | |
b75d63a7 | 128 | fPos[0] = 0.5*( (1.-wy)*xd[0]+ wy*xm[0] + (1.-wz)*xd[0]+ wz*xm[0] ); |
129 | fPos[1] = (1.-wy)*xd[1]+ wy*xm[1]; | |
130 | fPos[2] = (1.-wz)*xd[2]+ wz*xm[2]; | |
6c94f330 | 131 | // |
b75d63a7 | 132 | phelix.GetMomentum(phase[0][0],fPmom); |
133 | mhelix.GetMomentum(phase[0][1],fNmom); | |
6c94f330 | 134 | phelix.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle); |
b75d63a7 | 135 | fRr = TMath::Sqrt(fPos[0]*fPos[0]+fPos[1]*fPos[1]); |
6c94f330 | 136 | } |
137 | else{ | |
138 | Double_t xd[3],xm[3]; | |
139 | phelix.Evaluate(phase[1][0],xd); | |
140 | mhelix.Evaluate(phase[1][1], xm); | |
b75d63a7 | 141 | fPos[0] = 0.5*(xd[0]+xm[0]); |
142 | fPos[1] = 0.5*(xd[1]+xm[1]); | |
143 | fPos[2] = 0.5*(xd[2]+xm[2]); | |
d6a49f20 | 144 | Float_t wy = fParamP.GetCovariance()[0]/(fParamP.GetCovariance()[0]+fParamN.GetCovariance()[0]); |
145 | Float_t wz = fParamP.GetCovariance()[2]/(fParamP.GetCovariance()[2]+fParamN.GetCovariance()[2]); | |
b75d63a7 | 146 | fPos[0] = 0.5*( (1.-wy)*xd[0]+ wy*xm[0] + (1.-wz)*xd[0]+ wz*xm[0] ); |
147 | fPos[1] = (1.-wy)*xd[1]+ wy*xm[1]; | |
148 | fPos[2] = (1.-wz)*xd[2]+ wz*xm[2]; | |
6c94f330 | 149 | // |
b75d63a7 | 150 | phelix.GetMomentum(phase[1][0], fPmom); |
151 | mhelix.GetMomentum(phase[1][1], fNmom); | |
6c94f330 | 152 | phelix.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle); |
b75d63a7 | 153 | fRr = TMath::Sqrt(fPos[0]*fPos[0]+fPos[1]*fPos[1]); |
6c94f330 | 154 | } |
b75d63a7 | 155 | //Bo: fDist1 = TMath::Sqrt(TMath::Min(d1,d2)); |
156 | //Bo: fDist2 = TMath::Sqrt(distance2); | |
157 | fDcaV0Daughters = TMath::Sqrt(distance2);//Bo: | |
6c94f330 | 158 | // |
159 | // | |
b75d63a7 | 160 | Double_t v[3] = {fPos[0]-vertex[0],fPos[1]-vertex[1],fPos[2]-vertex[2]}; |
161 | Double_t p[3] = {fPmom[0]+fNmom[0], fPmom[1]+fNmom[1],fPmom[2]+fNmom[2]}; | |
6c94f330 | 162 | Double_t vnorm2 = v[0]*v[0]+v[1]*v[1]; |
163 | if (TMath::Abs(v[2])>100000) return; | |
164 | Double_t vnorm3 = TMath::Sqrt(TMath::Abs(v[2]*v[2]+vnorm2)); | |
165 | vnorm2 = TMath::Sqrt(vnorm2); | |
166 | Double_t pnorm2 = p[0]*p[0]+p[1]*p[1]; | |
167 | Double_t pnorm3 = TMath::Sqrt(p[2]*p[2]+pnorm2); | |
168 | pnorm2 = TMath::Sqrt(pnorm2); | |
169 | fPointAngleFi = (v[0]*p[0]+v[1]*p[1])/(vnorm2*pnorm2); | |
170 | fPointAngleTh = (v[2]*p[2]+vnorm2*pnorm2)/(vnorm3*pnorm3); | |
171 | fPointAngle = (v[0]*p[0]+v[1]*p[1]+v[2]*p[2])/(vnorm3*pnorm3); | |
172 | // | |
173 | } | |
174 |