1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 //-------------------------------------------------------------------------
19 // Origin: Marian Ivanov marian.ivanov@cern.ch
20 //-------------------------------------------------------------------------
22 #include <Riostream.h>
25 #include "AliESDkink.h"
31 AliESDkink::AliESDkink(){
38 for (Int_t i=0;i<12;i++) fStatus[i]=0;
40 for (Int_t i=0;i<2;i++)
41 for (Int_t j=0;j<2;j++){
43 fTPCdensity2[i][j]=-1;
49 void AliESDkink::SetMother(const AliExternalTrackParam & pmother) {
53 fParamMother = pmother;
56 void AliESDkink::SetDaughter(const AliExternalTrackParam & pdaughter){
60 fParamDaughter = pdaughter;
64 void AliESDkink::Update()
69 Float_t distance2=1000;
71 AliHelix dhelix1(fParamDaughter);
72 AliHelix mhelix(fParamMother);
74 //find intersection linear
76 Double_t phase[2][2],radius[2];
77 Double_t delta1=10000,delta2=10000;
81 Int_t points = dhelix1.GetRPHIintersections(mhelix, phase, radius,200);
84 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
87 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
89 distance1 = TMath::Min(delta1,delta2);
92 //find intersection parabolic
94 points = dhelix1.GetRPHIintersections(mhelix, phase, radius,7);
96 delta1=10000,delta2=10000;
97 Double_t d1=1000.,d2=10000.;
99 dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1,6);
100 // dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
101 Double_t xd[3],xm[3];
102 dhelix1.Evaluate(phase[0][0],xd);
103 mhelix.Evaluate(phase[0][1],xm);
104 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]);
107 dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2,6);
108 //dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
109 Double_t xd[3],xm[3];
110 dhelix1.Evaluate(phase[1][0],xd);
111 mhelix.Evaluate(phase[1][1],xm);
112 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]);
115 distance2 = TMath::Min(delta1,delta2);
118 // dhelix1.Evaluate(phase[0][0],fXr);
119 Double_t xd[3],xm[3];
120 dhelix1.Evaluate(phase[0][0],xd);
121 mhelix.Evaluate(phase[0][1], xm);
122 fXr[0] = 0.5*(xd[0]+xm[0]);
123 fXr[1] = 0.5*(xd[1]+xm[1]);
124 fXr[2] = 0.5*(xd[2]+xm[2]);
126 dhelix1.GetMomentum(phase[0][0],fPdr);
127 mhelix.GetMomentum(phase[0][1],fPm);
128 dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle);
129 //fRr = TMath::Sqrt(radius[0]);
130 fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]);
133 //dhelix1.Evaluate(phase[1][0],fXr);
134 Double_t xd[3],xm[3];
135 dhelix1.Evaluate(phase[1][0],xd);
136 mhelix.Evaluate(phase[1][1], xm);
137 fXr[0] = 0.5*(xd[0]+xm[0]);
138 fXr[1] = 0.5*(xd[1]+xm[1]);
139 fXr[2] = 0.5*(xd[2]+xm[2]);
141 dhelix1.GetMomentum(phase[1][0], fPdr);
142 mhelix.GetMomentum(phase[1][1], fPm);
143 dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle);
144 // fRr = TMath::Sqrt(radius[1]);
145 fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]);
147 fDist1 = TMath::Sqrt(TMath::Min(d1,d2));
148 fDist2 = TMath::Sqrt(distance2);
155 Float_t AliESDkink::GetTPCDensityFactor() const
159 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));
162 Float_t AliESDkink::GetQt() const
164 Float_t dmomentum = TMath::Sqrt(fPdr[0]*fPdr[0]+fPdr[1]*fPdr[1]+fPdr[2]*fPdr[2]);
165 return TMath::Sin(fAngle[2])*dmomentum;