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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 | // Origin: Marian Ivanov marian.ivanov@cern.ch | |
18 | //------------------------------------------------------------------------- | |
19 | ||
20 | #include <TMath.h> | |
21 | #include "AliKink.h" | |
22 | #include "AliHelix.h" | |
23 | ||
24 | ||
25 | ClassImp(AliKink) | |
26 | ||
27 | void AliKink::Update() | |
28 | { | |
29 | // | |
30 | // updates Kink Info | |
31 | // | |
32 | Float_t distance2=1000; | |
33 | // | |
34 | AliHelix dhelix1(fParamDaughter); | |
35 | AliHelix mhelix(fParamMother); | |
36 | // | |
37 | //find intersection linear | |
38 | // | |
39 | Double_t phase[2][2],radius[2]; | |
40 | Double_t delta1=10000,delta2=10000; | |
41 | Int_t points=0; | |
42 | /* | |
43 | Float_t distance1=0; | |
44 | Int_t points = dhelix1.GetRPHIintersections(mhelix, phase, radius,200); | |
45 | ||
46 | if (points>0){ | |
47 | dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
48 | } | |
49 | if (points==2){ | |
50 | dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
51 | } | |
52 | distance1 = TMath::Min(delta1,delta2); | |
53 | */ | |
54 | // | |
55 | //find intersection parabolic | |
56 | // | |
57 | points = dhelix1.GetRPHIintersections(mhelix, phase, radius,7); | |
58 | ||
59 | delta1=10000,delta2=10000; | |
60 | Double_t d1=1000.,d2=10000.; | |
61 | if (points>0){ | |
62 | dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1,6); | |
63 | // dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1); | |
64 | Double_t xd[3],xm[3]; | |
65 | dhelix1.Evaluate(phase[0][0],xd); | |
66 | mhelix.Evaluate(phase[0][1],xm); | |
67 | 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]); | |
68 | } | |
69 | if (points==2){ | |
70 | dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2,6); | |
71 | //dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2); | |
72 | Double_t xd[3],xm[3]; | |
73 | dhelix1.Evaluate(phase[1][0],xd); | |
74 | mhelix.Evaluate(phase[1][1],xm); | |
75 | 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]); | |
76 | } | |
77 | // | |
78 | distance2 = TMath::Min(delta1,delta2); | |
79 | if (delta1<delta2){ | |
80 | //get V0 info | |
81 | // dhelix1.Evaluate(phase[0][0],fXr); | |
82 | Double_t xd[3],xm[3]; | |
83 | dhelix1.Evaluate(phase[0][0],xd); | |
84 | mhelix.Evaluate(phase[0][1], xm); | |
85 | fXr[0] = 0.5*(xd[0]+xm[0]); | |
86 | fXr[1] = 0.5*(xd[1]+xm[1]); | |
87 | fXr[2] = 0.5*(xd[2]+xm[2]); | |
88 | // | |
89 | dhelix1.GetMomentum(phase[0][0],fPdr); | |
90 | mhelix.GetMomentum(phase[0][1],fPm); | |
91 | dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle); | |
92 | //fRr = TMath::Sqrt(radius[0]); | |
93 | fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]); | |
94 | } | |
95 | else{ | |
96 | //dhelix1.Evaluate(phase[1][0],fXr); | |
97 | Double_t xd[3],xm[3]; | |
98 | dhelix1.Evaluate(phase[1][0],xd); | |
99 | mhelix.Evaluate(phase[1][1], xm); | |
100 | fXr[0] = 0.5*(xd[0]+xm[0]); | |
101 | fXr[1] = 0.5*(xd[1]+xm[1]); | |
102 | fXr[2] = 0.5*(xd[2]+xm[2]); | |
103 | // | |
104 | dhelix1.GetMomentum(phase[1][0], fPdr); | |
105 | mhelix.GetMomentum(phase[1][1], fPm); | |
106 | dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle); | |
107 | // fRr = TMath::Sqrt(radius[1]); | |
108 | fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]); | |
109 | } | |
110 | fDist1 = TMath::Sqrt(TMath::Min(d1,d2)); | |
111 | fDist2 = TMath::Sqrt(distance2); | |
112 | // | |
113 | // | |
114 | ||
115 | } | |
116 |