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 "AliESDV0MI.h"
31 AliESDV0MI::AliESDV0MI() :
54 for (Int_t i=0;i<4;i++){fCausality[i]=0;}
55 for (Int_t i=0;i<6;i++){fClusters[0][i]=0; fClusters[1][i]=0;}
56 for (Int_t i=0;i<2;i++){fNormDCAPrim[0]=0;fNormDCAPrim[1]=0;}
60 void AliESDV0MI::SetCausality(Float_t pb0, Float_t pb1, Float_t pa0, Float_t pa1)
65 fCausality[0] = pb0; // probability - track 0 exist before vertex
66 fCausality[1] = pb1; // probability - track 1 exist before vertex
67 fCausality[2] = pa0; // probability - track 0 exist close after vertex
68 fCausality[3] = pa1; // probability - track 1 exist close after vertex
70 void AliESDV0MI::SetClusters(Int_t *clp, Int_t *clm)
73 // Set its clusters indexes
75 for (Int_t i=0;i<6;i++) fClusters[0][i] = clp[i];
76 for (Int_t i=0;i<6;i++) fClusters[1][i] = clm[i];
80 void AliESDV0MI::SetP(const AliExternalTrackParam & paramp) {
87 void AliESDV0MI::SetM(const AliExternalTrackParam & paramm){
94 void AliESDV0MI::SetRp(const Double_t *rp){
98 for (Int_t i=0;i<5;i++) fRP[i]=rp[i];
101 void AliESDV0MI::SetRm(const Double_t *rm){
105 for (Int_t i=0;i<5;i++) fRM[i]=rm[i];
109 void AliESDV0MI::UpdatePID(Double_t pidp[5], Double_t pidm[5])
117 for (Int_t i=0;i<5;i++){
123 for (Int_t i=0;i<5;i++){
129 Float_t AliESDV0MI::GetProb(UInt_t p1, UInt_t p2){
134 return TMath::Max(fRP[p1]+fRM[p2], fRP[p2]+fRM[p1]);
137 Float_t AliESDV0MI::GetEffMass(UInt_t p1, UInt_t p2){
139 // calculate effective mass
141 const Float_t kpmass[5] = {5.10000000000000037e-04,1.05660000000000004e-01,1.39570000000000000e-01,
142 4.93599999999999983e-01, 9.38270000000000048e-01};
145 Float_t mass1 = kpmass[p1];
146 Float_t mass2 = kpmass[p2];
150 //if (fRP[p1]+fRM[p2]<fRP[p2]+fRM[p1]){
155 Float_t e1 = TMath::Sqrt(mass1*mass1+
159 Float_t e2 = TMath::Sqrt(mass2*mass2+
164 (m2[0]+m1[0])*(m2[0]+m1[0])+
165 (m2[1]+m1[1])*(m2[1]+m1[1])+
166 (m2[2]+m1[2])*(m2[2]+m1[2]);
168 mass = TMath::Sqrt((e1+e2)*(e1+e2)-mass);
172 void AliESDV0MI::Update(Float_t vertex[3])
177 // Float_t distance1,distance2;
180 AliHelix phelix(fParamP);
181 AliHelix mhelix(fParamM);
183 //find intersection linear
185 Double_t phase[2][2],radius[2];
186 Int_t points = phelix.GetRPHIintersections(mhelix, phase, radius,200);
187 Double_t delta1=10000,delta2=10000;
189 if (points<=0) return;
191 phelix.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
192 phelix.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
193 phelix.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
196 phelix.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
197 phelix.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
198 phelix.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
200 distance1 = TMath::Min(delta1,delta2);
203 //find intersection parabolic
205 points = phelix.GetRPHIintersections(mhelix, phase, radius);
206 delta1=10000,delta2=10000;
207 Double_t d1=1000.,d2=10000.;
208 Double_t err[3],angles[3];
209 if (points<=0) return;
211 phelix.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
212 phelix.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
213 if (TMath::Abs(fParamP.X()-TMath::Sqrt(radius[0])<3) && TMath::Abs(fParamM.X()-TMath::Sqrt(radius[0])<3)){
214 // if we are close to vertex use error parama
216 err[1] = fParamP.GetCovariance()[0]+fParamM.GetCovariance()[0]+0.05*0.05
217 +0.3*(fParamP.GetCovariance()[2]+fParamM.GetCovariance()[2]);
218 err[2] = fParamP.GetCovariance()[2]+fParamM.GetCovariance()[2]+0.05*0.05
219 +0.3*(fParamP.GetCovariance()[0]+fParamM.GetCovariance()[0]);
221 phelix.GetAngle(phase[0][0],mhelix,phase[0][1],angles);
222 Double_t tfi = TMath::Abs(TMath::Tan(angles[0]));
223 Double_t tlam = TMath::Abs(TMath::Tan(angles[1]));
224 err[0] = err[1]/((0.2+tfi)*(0.2+tfi))+err[2]/((0.2+tlam)*(0.2+tlam));
225 err[0] = ((err[1]*err[2]/((0.2+tfi)*(0.2+tfi)*(0.2+tlam)*(0.2+tlam))))/err[0];
226 phelix.ParabolicDCA2(mhelix,phase[0][0],phase[0][1],radius[0],delta1,err);
228 Double_t xd[3],xm[3];
229 phelix.Evaluate(phase[0][0],xd);
230 mhelix.Evaluate(phase[0][1],xm);
231 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]);
234 phelix.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
235 phelix.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
236 if (TMath::Abs(fParamP.X()-TMath::Sqrt(radius[1])<3) && TMath::Abs(fParamM.X()-TMath::Sqrt(radius[1])<3)){
237 // if we are close to vertex use error paramatrization
239 err[1] = fParamP.GetCovariance()[0]+fParamM.GetCovariance()[0]+0.05*0.05
240 +0.3*(fParamP.GetCovariance()[2]+fParamM.GetCovariance()[2]);
241 err[2] = fParamP.GetCovariance()[2]+fParamM.GetCovariance()[2]+0.05*0.05
242 +0.3*(fParamP.GetCovariance()[0]+fParamM.GetCovariance()[0]);
244 phelix.GetAngle(phase[1][0],mhelix,phase[1][1],angles);
245 Double_t tfi = TMath::Abs(TMath::Tan(angles[0]));
246 Double_t tlam = TMath::Abs(TMath::Tan(angles[1]));
247 err[0] = err[1]/((0.2+tfi)*(0.2+tfi))+err[2]/((0.2+tlam)*(0.2+tlam));
248 err[0] = ((err[1]*err[2]/((0.2+tfi)*(0.2+tfi)*(0.2+tlam)*(0.2+tlam))))/err[0];
249 phelix.ParabolicDCA2(mhelix,phase[1][0],phase[1][1],radius[1],delta2,err);
251 Double_t xd[3],xm[3];
252 phelix.Evaluate(phase[1][0],xd);
253 mhelix.Evaluate(phase[1][1],xm);
254 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]);
257 distance2 = TMath::Min(delta1,delta2);
260 Double_t xd[3],xm[3];
261 phelix.Evaluate(phase[0][0],xd);
262 mhelix.Evaluate(phase[0][1], xm);
263 fXr[0] = 0.5*(xd[0]+xm[0]);
264 fXr[1] = 0.5*(xd[1]+xm[1]);
265 fXr[2] = 0.5*(xd[2]+xm[2]);
267 Float_t wy = fParamP.GetCovariance()[0]/(fParamP.GetCovariance()[0]+fParamM.GetCovariance()[0]);
268 Float_t wz = fParamP.GetCovariance()[2]/(fParamP.GetCovariance()[2]+fParamM.GetCovariance()[2]);
269 fXr[0] = 0.5*( (1.-wy)*xd[0]+ wy*xm[0] + (1.-wz)*xd[0]+ wz*xm[0] );
270 fXr[1] = (1.-wy)*xd[1]+ wy*xm[1];
271 fXr[2] = (1.-wz)*xd[2]+ wz*xm[2];
273 phelix.GetMomentum(phase[0][0],fPP);
274 mhelix.GetMomentum(phase[0][1],fPM);
275 phelix.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle);
276 fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]);
279 Double_t xd[3],xm[3];
280 phelix.Evaluate(phase[1][0],xd);
281 mhelix.Evaluate(phase[1][1], xm);
282 fXr[0] = 0.5*(xd[0]+xm[0]);
283 fXr[1] = 0.5*(xd[1]+xm[1]);
284 fXr[2] = 0.5*(xd[2]+xm[2]);
285 Float_t wy = fParamP.GetCovariance()[0]/(fParamP.GetCovariance()[0]+fParamM.GetCovariance()[0]);
286 Float_t wz = fParamP.GetCovariance()[2]/(fParamP.GetCovariance()[2]+fParamM.GetCovariance()[2]);
287 fXr[0] = 0.5*( (1.-wy)*xd[0]+ wy*xm[0] + (1.-wz)*xd[0]+ wz*xm[0] );
288 fXr[1] = (1.-wy)*xd[1]+ wy*xm[1];
289 fXr[2] = (1.-wz)*xd[2]+ wz*xm[2];
291 phelix.GetMomentum(phase[1][0], fPP);
292 mhelix.GetMomentum(phase[1][1], fPM);
293 phelix.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle);
294 fRr = TMath::Sqrt(fXr[0]*fXr[0]+fXr[1]*fXr[1]);
296 fDist1 = TMath::Sqrt(TMath::Min(d1,d2));
297 fDist2 = TMath::Sqrt(distance2);
300 Double_t v[3] = {fXr[0]-vertex[0],fXr[1]-vertex[1],fXr[2]-vertex[2]};
301 Double_t p[3] = {fPP[0]+fPM[0], fPP[1]+fPM[1],fPP[2]+fPM[2]};
302 Double_t vnorm2 = v[0]*v[0]+v[1]*v[1];
303 Double_t vnorm3 = TMath::Sqrt(v[2]*v[2]+vnorm2);
304 vnorm2 = TMath::Sqrt(vnorm2);
305 Double_t pnorm2 = p[0]*p[0]+p[1]*p[1];
306 Double_t pnorm3 = TMath::Sqrt(p[2]*p[2]+pnorm2);
307 pnorm2 = TMath::Sqrt(pnorm2);
308 fPointAngleFi = (v[0]*p[0]+v[1]*p[1])/(vnorm2*pnorm2);
309 fPointAngleTh = (v[2]*p[2]+vnorm2*pnorm2)/(vnorm3*pnorm3);
310 fPointAngle = (v[0]*p[0]+v[1]*p[1]+v[2]*p[2])/(vnorm3*pnorm3);