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51ad6848 | 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 | /* $Id$ */ | |
17 | ||
18 | //------------------------------------------------------------------------- | |
19 | // Origin: Marian Ivanov marian.ivanov@cern.ch | |
20 | //------------------------------------------------------------------------- | |
21 | ||
22 | #include <Riostream.h> | |
23 | #include <TMath.h> | |
24 | #include <TPDGCode.h> | |
25 | #include "AliESDkink.h" | |
26 | #include "AliHelix.h" | |
27 | ||
28 | ||
29 | ClassImp(AliESDkink) | |
30 | ||
31 | AliESDkink::AliESDkink(){ | |
32 | // | |
33 | //Dafault constructor | |
34 | // | |
35 | fDist1 =-1; | |
36 | fDist2 =-1; | |
37 | fRr =-1; | |
38 | fStatus = 0; | |
39 | fRow0 =-1; | |
40 | fTPCdensity2[0][0]=-1; | |
41 | fTPCdensity2[0][1]=-1; | |
42 | ||
43 | } | |
44 | ||
45 | void AliESDkink::SetMother(const AliExternalTrackParam & pmother) { | |
46 | // | |
47 | // set mother | |
48 | // | |
49 | fParamMother = pmother; | |
50 | } | |
51 | ||
52 | void AliESDkink::SetDaughter(const AliExternalTrackParam & pdaughter){ | |
53 | // | |
54 | //set daughter | |
55 | // | |
56 | fParamDaughter = pdaughter; | |
57 | ||
58 | } | |
59 | ||
60 | void AliESDkink::Update() | |
61 | { | |
62 | // | |
63 | // updates Kink Info | |
64 | // | |
65 | Float_t distance1,distance2; | |
66 | // | |
67 | AliHelix dhelix1(fParamDaughter); | |
68 | AliHelix mhelix(fParamMother); | |
69 | // | |
70 | //find intersection linear | |
71 | // | |
72 | Double_t phase[2][2],radius[2]; | |
73 | Int_t points = dhelix1.GetRPHIintersections(mhelix, phase, radius,200); | |
74 | Double_t delta1=10000,delta2=10000; | |
75 | ||
76 | if (points>0){ | |
77 | dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
78 | dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
79 | dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
80 | } | |
81 | if (points==2){ | |
82 | dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
83 | dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
84 | dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
85 | } | |
86 | distance1 = TMath::Min(delta1,delta2); | |
87 | // | |
88 | //find intersection parabolic | |
89 | // | |
90 | points = dhelix1.GetRPHIintersections(mhelix, phase, radius); | |
91 | delta1=10000,delta2=10000; | |
92 | Double_t d1=1000.,d2=10000.; | |
93 | if (points>0){ | |
94 | dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
95 | dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
96 | Double_t xd[3],xm[3]; | |
97 | dhelix1.Evaluate(phase[0][0],xd); | |
98 | mhelix.Evaluate(phase[0][1],xm); | |
99 | 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]); | |
100 | } | |
101 | if (points==2){ | |
102 | dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
103 | dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
104 | Double_t xd[3],xm[3]; | |
105 | dhelix1.Evaluate(phase[1][0],xd); | |
106 | mhelix.Evaluate(phase[1][1],xm); | |
107 | 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]); | |
108 | } | |
109 | // | |
110 | distance2 = TMath::Min(delta1,delta2); | |
111 | if (delta1<delta2){ | |
112 | //get V0 info | |
113 | // dhelix1.Evaluate(phase[0][0],fXr); | |
114 | Double_t xd[3],xm[3]; | |
115 | dhelix1.Evaluate(phase[0][0],xd); | |
116 | mhelix.Evaluate(phase[0][1], xm); | |
117 | fXr[0] = 0.5*(xd[0]+xm[0]); | |
118 | fXr[1] = 0.5*(xd[1]+xm[1]); | |
119 | fXr[2] = 0.5*(xd[2]+xm[2]); | |
120 | // | |
121 | dhelix1.GetMomentum(phase[0][0],fPdr); | |
122 | mhelix.GetMomentum(phase[0][1],fPm); | |
123 | dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle); | |
124 | //fRr = TMath::Sqrt(radius[0]); | |
125 | fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]); | |
126 | } | |
127 | else{ | |
128 | //dhelix1.Evaluate(phase[1][0],fXr); | |
129 | Double_t xd[3],xm[3]; | |
130 | dhelix1.Evaluate(phase[1][0],xd); | |
131 | mhelix.Evaluate(phase[1][1], xm); | |
132 | fXr[0] = 0.5*(xd[0]+xm[0]); | |
133 | fXr[1] = 0.5*(xd[1]+xm[1]); | |
134 | fXr[2] = 0.5*(xd[2]+xm[2]); | |
135 | // | |
136 | dhelix1.GetMomentum(phase[1][0], fPdr); | |
137 | mhelix.GetMomentum(phase[1][1], fPm); | |
138 | dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle); | |
139 | // fRr = TMath::Sqrt(radius[1]); | |
140 | fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]); | |
141 | } | |
142 | fDist1 = TMath::Sqrt(TMath::Min(d1,d2)); | |
143 | fDist2 = TMath::Sqrt(distance2); | |
144 | // | |
145 | // | |
146 | ||
147 | } | |
148 | ||
149 | ||
150 | Float_t AliESDkink::GetTPCDensityFactor() const | |
151 | { | |
152 | // | |
153 | // | |
154 | return fTPCdensity[0][0]+fTPCdensity[1][1]-TMath::Max(fTPCdensity[0][1],Float_t(0.0))-TMath::Max(fTPCdensity[1][0],Float_t(0.0)); | |
155 | } | |
156 | ||
157 | Float_t AliESDkink::GetQt() const | |
158 | { | |
159 | Float_t dmomentum = TMath::Sqrt(fPdr[0]*fPdr[0]+fPdr[1]*fPdr[1]+fPdr[2]*fPdr[2]); | |
160 | return TMath::Sin(fAngle[2])*dmomentum; | |
161 | } |