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 //____________________________________________________________________
32 AliESDkink::AliESDkink() :
46 for (Int_t i=0;i<12;i++) fStatus[i]=0;
47 for (Int_t i=0;i<2;i++)
48 for (Int_t j=0;j<2;j++){
50 fTPCdensity2[i][j]=-1;
52 fTPCncls[0]=fTPCncls[1]=0;
54 for (Int_t i=0; i<3; i++) {
62 fIndex[0]=fIndex[1]=-1;
63 fMultiple[0]=fMultiple[1]=0;
66 void AliESDkink::SetMother(const AliExternalTrackParam & pmother) {
70 fParamMother = pmother;
73 void AliESDkink::SetDaughter(const AliExternalTrackParam & pdaughter){
77 fParamDaughter = pdaughter;
81 void AliESDkink::Update()
86 Float_t distance2=1000;
88 AliHelix dhelix1(fParamDaughter);
89 AliHelix mhelix(fParamMother);
91 //find intersection linear
93 Double_t phase[2][2],radius[2];
94 Double_t delta1=10000,delta2=10000;
98 Int_t points = dhelix1.GetRPHIintersections(mhelix, phase, radius,200);
101 dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
104 dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
106 distance1 = TMath::Min(delta1,delta2);
109 //find intersection parabolic
111 points = dhelix1.GetRPHIintersections(mhelix, phase, radius,7);
113 delta1=10000,delta2=10000;
114 Double_t d1=1000.,d2=10000.;
116 dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1,6);
117 // dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
118 Double_t xd[3],xm[3];
119 dhelix1.Evaluate(phase[0][0],xd);
120 mhelix.Evaluate(phase[0][1],xm);
121 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]);
124 dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2,6);
125 //dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
126 Double_t xd[3],xm[3];
127 dhelix1.Evaluate(phase[1][0],xd);
128 mhelix.Evaluate(phase[1][1],xm);
129 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]);
132 distance2 = TMath::Min(delta1,delta2);
135 // dhelix1.Evaluate(phase[0][0],fXr);
136 Double_t xd[3],xm[3];
137 dhelix1.Evaluate(phase[0][0],xd);
138 mhelix.Evaluate(phase[0][1], xm);
139 fXr[0] = 0.5*(xd[0]+xm[0]);
140 fXr[1] = 0.5*(xd[1]+xm[1]);
141 fXr[2] = 0.5*(xd[2]+xm[2]);
143 dhelix1.GetMomentum(phase[0][0],fPdr);
144 mhelix.GetMomentum(phase[0][1],fPm);
145 dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle);
146 //fRr = TMath::Sqrt(radius[0]);
147 fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]);
150 //dhelix1.Evaluate(phase[1][0],fXr);
151 Double_t xd[3],xm[3];
152 dhelix1.Evaluate(phase[1][0],xd);
153 mhelix.Evaluate(phase[1][1], xm);
154 fXr[0] = 0.5*(xd[0]+xm[0]);
155 fXr[1] = 0.5*(xd[1]+xm[1]);
156 fXr[2] = 0.5*(xd[2]+xm[2]);
158 dhelix1.GetMomentum(phase[1][0], fPdr);
159 mhelix.GetMomentum(phase[1][1], fPm);
160 dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle);
161 // fRr = TMath::Sqrt(radius[1]);
162 fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]);
164 fDist1 = TMath::Sqrt(TMath::Min(d1,d2));
165 fDist2 = TMath::Sqrt(distance2);
172 Float_t AliESDkink::GetTPCDensityFactor() const
176 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));
179 Float_t AliESDkink::GetQt() const
181 Float_t dmomentum = TMath::Sqrt(fPdr[0]*fPdr[0]+fPdr[1]*fPdr[1]+fPdr[2]*fPdr[2]);
182 return TMath::Sin(fAngle[2])*dmomentum;