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Correct formula for phi, in case of current local X <0, in GetLocalXat and GetPhiZat
[u/mrichter/AliRoot.git] / ITS / AliITSV0Finder.cxx
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1/**************************************************************************
2 * Copyright(c) 2007-2009, 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/* $Id$ */
16
17//-------------------------------------------------------------------------
18// Implementation of the on-the-fly v0 finder for ITS tracker MI
19// Origin: Marian Ivanov, CERN, Marian.Ivanov@cern.ch
20// Extraction from AliITStrackerMI: Andrea Dainese
21// Current support and development:
22//-------------------------------------------------------------------------
23
24#include <TMatrixD.h>
25#include <TTree.h>
26#include <TString.h>
27#include <TRandom.h>
28#include <TTreeStream.h>
29
30
31#include "AliLog.h"
32#include "AliESDVertex.h"
33#include "AliESDEvent.h"
34#include "AliESDtrack.h"
35#include "AliV0.h"
36#include "AliHelix.h"
37#include "AliITSRecPoint.h"
38#include "AliITSReconstructor.h"
39#include "AliITStrackerMI.h"
40#include "AliITSV0Finder.h"
41
42ClassImp(AliITSV0Finder)
43
44AliITSV0Finder::AliITSV0Finder() {
45 //Default constructor
46}
47//------------------------------------------------------------------------
48void AliITSV0Finder::UpdateTPCV0(const AliESDEvent *event,
49 AliITStrackerMI *tracker)
50{
51 //
52 //try to update, or reject TPC V0s
53 //
54 TObjArray *trackHypothesys = tracker->GetTrackHypothesys();
55
56 Int_t nv0s = event->GetNumberOfV0s();
57 Int_t nitstracks = trackHypothesys->GetEntriesFast();
58
59 for (Int_t i=0;i<nv0s;i++){
60 AliESDv0 * vertex = event->GetV0(i);
61 Int_t ip = vertex->GetIndex(0);
62 Int_t im = vertex->GetIndex(1);
63 //
64 TObjArray * arrayp = (ip<nitstracks) ? (TObjArray*)trackHypothesys->At(ip):0;
65 TObjArray * arraym = (im<nitstracks) ? (TObjArray*)trackHypothesys->At(im):0;
66 AliITStrackMI * trackp = (arrayp!=0) ? (AliITStrackMI*)arrayp->At(0):0;
67 AliITStrackMI * trackm = (arraym!=0) ? (AliITStrackMI*)arraym->At(0):0;
68 //
69 //
70 if (trackp){
71 if (trackp->GetNumberOfClusters()+trackp->GetNDeadZone()>5.5){
72 if (trackp->GetConstrain()&&trackp->GetChi2MIP(0)<3) vertex->SetStatus(-100);
73 if (!trackp->GetConstrain()&&trackp->GetChi2MIP(0)<2) vertex->SetStatus(-100);
74 }
75 }
76
77 if (trackm){
78 if (trackm->GetNumberOfClusters()+trackm->GetNDeadZone()>5.5){
79 if (trackm->GetConstrain()&&trackm->GetChi2MIP(0)<3) vertex->SetStatus(-100);
80 if (!trackm->GetConstrain()&&trackm->GetChi2MIP(0)<2) vertex->SetStatus(-100);
81 }
82 }
83 if (vertex->GetStatus()==-100) continue;
84 //
85 Double_t xrp[3]; vertex->GetXYZ(xrp[0],xrp[1],xrp[2]); //I.B.
86 Int_t clayer = tracker->GetNearestLayer(xrp); //I.B.
87 vertex->SetNBefore(clayer); //
88 vertex->SetChi2Before(9*clayer); //
89 vertex->SetNAfter(6-clayer); //
90 vertex->SetChi2After(0); //
91 //
92 if (clayer >1 ){ // calculate chi2 before vertex
93 Float_t chi2p = 0, chi2m=0;
94 //
95 if (trackp){
96 for (Int_t ilayer=0;ilayer<clayer;ilayer++){
97 if (trackp->GetClIndex(ilayer)>=0){
98 chi2p+=trackp->GetDy(ilayer)*trackp->GetDy(ilayer)/(trackp->GetSigmaY(ilayer)*trackp->GetSigmaY(ilayer))+
99 trackp->GetDz(ilayer)*trackp->GetDz(ilayer)/(trackp->GetSigmaZ(ilayer)*trackp->GetSigmaZ(ilayer));
100 }
101 else{
102 chi2p+=9;
103 }
104 }
105 }else{
106 chi2p = 9*clayer;
107 }
108 //
109 if (trackm){
110 for (Int_t ilayer=0;ilayer<clayer;ilayer++){
111 if (trackm->GetClIndex(ilayer)>=0){
112 chi2m+=trackm->GetDy(ilayer)*trackm->GetDy(ilayer)/(trackm->GetSigmaY(ilayer)*trackm->GetSigmaY(ilayer))+
113 trackm->GetDz(ilayer)*trackm->GetDz(ilayer)/(trackm->GetSigmaZ(ilayer)*trackm->GetSigmaZ(ilayer));
114 }
115 else{
116 chi2m+=9;
117 }
118 }
119 }else{
120 chi2m = 9*clayer;
121 }
122 vertex->SetChi2Before(TMath::Min(chi2p,chi2m));
123 if (TMath::Min(chi2p,chi2m)/Float_t(clayer)<4) vertex->SetStatus(-10); // track exist before vertex
124 }
125
126 if (clayer < 5 ){ // calculate chi2 after vertex
127 Float_t chi2p = 0, chi2m=0;
128 //
129 if (trackp&&TMath::Abs(trackp->GetTgl())<1.){
130 for (Int_t ilayer=clayer;ilayer<6;ilayer++){
131 if (trackp->GetClIndex(ilayer)>=0){
132 chi2p+=trackp->GetDy(ilayer)*trackp->GetDy(ilayer)/(trackp->GetSigmaY(ilayer)*trackp->GetSigmaY(ilayer))+
133 trackp->GetDz(ilayer)*trackp->GetDz(ilayer)/(trackp->GetSigmaZ(ilayer)*trackp->GetSigmaZ(ilayer));
134 }
135 else{
136 chi2p+=9;
137 }
138 }
139 }else{
140 chi2p = 0;
141 }
142 //
143 if (trackm&&TMath::Abs(trackm->GetTgl())<1.){
144 for (Int_t ilayer=clayer;ilayer<6;ilayer++){
145 if (trackm->GetClIndex(ilayer)>=0){
146 chi2m+=trackm->GetDy(ilayer)*trackm->GetDy(ilayer)/(trackm->GetSigmaY(ilayer)*trackm->GetSigmaY(ilayer))+
147 trackm->GetDz(ilayer)*trackm->GetDz(ilayer)/(trackm->GetSigmaZ(ilayer)*trackm->GetSigmaZ(ilayer));
148 }
149 else{
150 chi2m+=9;
151 }
152 }
153 }else{
154 chi2m = 0;
155 }
156 vertex->SetChi2After(TMath::Max(chi2p,chi2m));
157 if (TMath::Max(chi2m,chi2p)/Float_t(6-clayer)>9) vertex->SetStatus(-20); // track not found in ITS
158 }
159 }
160 //
161}
162//------------------------------------------------------------------------
163void AliITSV0Finder::FindV02(AliESDEvent *event,
164 AliITStrackerMI *tracker)
165{
166 //
167 // V0 finder
168 //
169 // Cuts on DCA - R dependent
170 // max distance DCA between 2 tracks cut
171 // maxDist = TMath::Min(kMaxDist,kMaxDist0+pvertex->GetRr()*kMaxDist);
172 //
173 const Float_t kMaxDist0 = 0.1;
174 const Float_t kMaxDist1 = 0.1;
175 const Float_t kMaxDist = 1;
176 const Float_t kMinPointAngle = 0.85;
177 const Float_t kMinPointAngle2 = 0.99;
178 const Float_t kMinR = 0.5;
179 const Float_t kMaxR = 220;
180 //const Float_t kCausality0Cut = 0.19;
181 //const Float_t kLikelihood01Cut = 0.25;
182 //const Float_t kPointAngleCut = 0.9996;
183 const Float_t kCausality0Cut = 0.19;
184 const Float_t kLikelihood01Cut = 0.45;
185 const Float_t kLikelihood1Cut = 0.5;
186 const Float_t kCombinedCut = 0.55;
187
188 TObjArray *trackHypothesys = tracker->GetTrackHypothesys();
189 TObjArray *bestHypothesys = tracker->GetBestHypothesys();
190 TObjArray *originalTracks = tracker->GetOriginal();
191 //
192 //
193 TTreeSRedirector &cstream = *(tracker->GetDebugStreamer());
194 Int_t ntracks = event->GetNumberOfTracks();
195 Int_t nitstracks = trackHypothesys->GetEntriesFast();
196 originalTracks->Expand(ntracks);
197 trackHypothesys->Expand(ntracks);
198 bestHypothesys->Expand(ntracks);
199 //
200 AliHelix * helixes = new AliHelix[ntracks+2];
201 TObjArray trackarray(ntracks+2); //array with tracks - with vertex constrain
202 TObjArray trackarrayc(ntracks+2); //array of "best tracks" - without vertex constrain
203 TObjArray trackarrayl(ntracks+2); //array of "longest tracks" - without vertex constrain
204 Bool_t * forbidden = new Bool_t [ntracks+2];
205 Int_t *itsmap = new Int_t [ntracks+2];
206 Float_t *dist = new Float_t[ntracks+2];
207 Float_t *normdist0 = new Float_t[ntracks+2];
208 Float_t *normdist1 = new Float_t[ntracks+2];
209 Float_t *normdist = new Float_t[ntracks+2];
210 Float_t *norm = new Float_t[ntracks+2];
211 Float_t *maxr = new Float_t[ntracks+2];
212 Float_t *minr = new Float_t[ntracks+2];
213 Float_t *minPointAngle= new Float_t[ntracks+2];
214 //
215 AliV0 *pvertex = new AliV0;
216 AliITStrackMI * dummy= new AliITStrackMI;
217 dummy->SetLabel(0);
218 AliITStrackMI trackat0; //temporary track for DCA calculation
219 //
220 Float_t primvertex[3]={tracker->GetX(),tracker->GetY(),tracker->GetZ()};
221 //
222 // make ITS - ESD map
223 //
224 for (Int_t itrack=0;itrack<ntracks+2;itrack++) {
225 itsmap[itrack] = -1;
226 forbidden[itrack] = kFALSE;
227 maxr[itrack] = kMaxR;
228 minr[itrack] = kMinR;
229 minPointAngle[itrack] = kMinPointAngle;
230 }
231 for (Int_t itrack=0;itrack<nitstracks;itrack++){
232 AliITStrackMI * original = (AliITStrackMI*)(originalTracks->At(itrack));
233 Int_t esdindex = original->GetESDtrack()->GetID();
234 itsmap[esdindex] = itrack;
235 }
236 //
237 // create ITS tracks from ESD tracks if not done before
238 //
239 for (Int_t itrack=0;itrack<ntracks;itrack++){
240 if (itsmap[itrack]>=0) continue;
241 AliITStrackMI * tpctrack = new AliITStrackMI(*(event->GetTrack(itrack)));
242 //tpctrack->fD[0] = tpctrack->GetD(GetX(),GetY());
243 //tpctrack->fD[1] = tpctrack->GetZat(GetX())-GetZ();
244 tpctrack->GetDZ(tracker->GetX(),tracker->GetY(),tracker->GetZ(),tpctrack->GetDP()); //I.B.
245 if (tpctrack->GetD(0)<20 && tpctrack->GetD(1)<20){
246 // tracks which can reach inner part of ITS
247 // propagate track to outer its volume - with correction for material
248 AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(tpctrack);
249 }
250 itsmap[itrack] = nitstracks;
251 originalTracks->AddAt(tpctrack,nitstracks);
252 nitstracks++;
253 }
254 //
255 // fill temporary arrays
256 //
257 for (Int_t itrack=0;itrack<ntracks;itrack++){
258 AliESDtrack * esdtrack = event->GetTrack(itrack);
259 Int_t itsindex = itsmap[itrack];
260 AliITStrackMI *original = (AliITStrackMI*)originalTracks->At(itsmap[itrack]);
261 if (!original) continue;
262 AliITStrackMI *bestConst = 0;
263 AliITStrackMI *bestLong = 0;
264 AliITStrackMI *best = 0;
265 //
266 //
267 TObjArray * array = (TObjArray*) trackHypothesys->At(itsindex);
268 Int_t hentries = (array==0) ? 0 : array->GetEntriesFast();
269 // Get best track with vertex constrain
270 for (Int_t ih=0;ih<hentries;ih++){
271 AliITStrackMI * trackh = (AliITStrackMI*)array->At(ih);
272 if (!trackh->GetConstrain()) continue;
273 if (!bestConst) bestConst = trackh;
274 if (trackh->GetNumberOfClusters()>5.0){
275 bestConst = trackh; // full track - with minimal chi2
276 break;
277 }
278 if (trackh->GetNumberOfClusters()+trackh->GetNDeadZone()<=bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()) continue;
279 bestConst = trackh;
280 break;
281 }
282 // Get best long track without vertex constrain and best track without vertex constrain
283 for (Int_t ih=0;ih<hentries;ih++){
284 AliITStrackMI * trackh = (AliITStrackMI*)array->At(ih);
285 if (trackh->GetConstrain()) continue;
286 if (!best) best = trackh;
287 if (!bestLong) bestLong = trackh;
288 if (trackh->GetNumberOfClusters()>5.0){
289 bestLong = trackh; // full track - with minimal chi2
290 break;
291 }
292 if (trackh->GetNumberOfClusters()+trackh->GetNDeadZone()<=bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone()) continue;
293 bestLong = trackh;
294 }
295 if (!best) {
296 best = original;
297 bestLong = original;
298 }
299 //I.B. trackat0 = *bestLong;
300 new (&trackat0) AliITStrackMI(*bestLong);
301 Double_t xx,yy,zz,alpha;
302 if (!bestLong->GetGlobalXYZat(bestLong->GetX(),xx,yy,zz)) continue;
303 alpha = TMath::ATan2(yy,xx);
304 if (!trackat0.Propagate(alpha,0)) continue;
305 // calculate normalized distances to the vertex
306 //
307 Float_t ptfac = (1.+100.*TMath::Abs(trackat0.GetC()));
308 if ( bestLong->GetNumberOfClusters()>3 ){
309 dist[itsindex] = trackat0.GetY();
310 norm[itsindex] = ptfac*TMath::Sqrt(trackat0.GetSigmaY2());
311 normdist0[itsindex] = TMath::Abs(trackat0.GetY()/norm[itsindex]);
312 normdist1[itsindex] = TMath::Abs((trackat0.GetZ()-primvertex[2])/(ptfac*TMath::Sqrt(trackat0.GetSigmaZ2())));
313 normdist[itsindex] = TMath::Sqrt(normdist0[itsindex]*normdist0[itsindex]+normdist1[itsindex]*normdist1[itsindex]);
314 if (!bestConst){
315 if (bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone()<6) normdist[itsindex]*=2.;
316 if (bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone()<5) normdist[itsindex]*=2.;
317 if (bestLong->GetNumberOfClusters()+bestLong->GetNDeadZone()<4) normdist[itsindex]*=2.;
318 }else{
319 if (bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()<6) normdist[itsindex]*=1.5;
320 if (bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()<5) normdist[itsindex]*=1.5;
321 }
322 }
323 else{
324 if (bestConst&&bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()>4.5){
325 dist[itsindex] = bestConst->GetD(0);
326 norm[itsindex] = bestConst->GetDnorm(0);
327 normdist0[itsindex] = TMath::Abs(bestConst->GetD(0)/norm[itsindex]);
328 normdist1[itsindex] = TMath::Abs(bestConst->GetD(0)/norm[itsindex]);
329 normdist[itsindex] = TMath::Sqrt(normdist0[itsindex]*normdist0[itsindex]+normdist1[itsindex]*normdist1[itsindex]);
330 }else{
331 dist[itsindex] = trackat0.GetY();
332 norm[itsindex] = ptfac*TMath::Sqrt(trackat0.GetSigmaY2());
333 normdist0[itsindex] = TMath::Abs(trackat0.GetY()/norm[itsindex]);
334 normdist1[itsindex] = TMath::Abs((trackat0.GetZ()-primvertex[2])/(ptfac*TMath::Sqrt(trackat0.GetSigmaZ2())));
335 normdist[itsindex] = TMath::Sqrt(normdist0[itsindex]*normdist0[itsindex]+normdist1[itsindex]*normdist1[itsindex]);
336 if (TMath::Abs(trackat0.GetTgl())>1.05){
337 if (normdist[itsindex]<3) forbidden[itsindex]=kTRUE;
338 if (normdist[itsindex]>3) {
339 minr[itsindex] = TMath::Max(Float_t(40.),minr[itsindex]);
340 }
341 }
342 }
343 }
344 //
345 //-----------------------------------------------------------
346 //Forbid primary track candidates -
347 //
348 //treetr->SetAlias("forbidden0","Tr0.fN<4&&Tr1.fN+Tr1.fNDeadZone>4.5");
349 //treetr->SetAlias("forbidden1","ND<3&&Tr1.fN+Tr1.fNDeadZone>5.5");
350 //treetr->SetAlias("forbidden2","ND<2&&Tr1.fClIndex[0]>0&&Tr1.fClIndex[0]>0");
351 //treetr->SetAlias("forbidden3","ND<1&&Tr1.fClIndex[0]>0");
352 //treetr->SetAlias("forbidden4","ND<4&&Tr1.fNormChi2[0]<2");
353 //treetr->SetAlias("forbidden5","ND<5&&Tr1.fNormChi2[0]<1");
354 //-----------------------------------------------------------
355 if (bestConst){
356 if (bestLong->GetNumberOfClusters()<4 && bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()>4.5) forbidden[itsindex]=kTRUE;
357 if (normdist[itsindex]<3 && bestConst->GetNumberOfClusters()+bestConst->GetNDeadZone()>5.5) forbidden[itsindex]=kTRUE;
358 if (normdist[itsindex]<2 && bestConst->GetClIndex(0)>=0 && bestConst->GetClIndex(1)>=0 ) forbidden[itsindex]=kTRUE;
359 if (normdist[itsindex]<1 && bestConst->GetClIndex(0)>=0) forbidden[itsindex]=kTRUE;
360 if (normdist[itsindex]<4 && bestConst->GetNormChi2(0)<2) forbidden[itsindex]=kTRUE;
361 if (normdist[itsindex]<5 && bestConst->GetNormChi2(0)<1) forbidden[itsindex]=kTRUE;
362 if (bestConst->GetNormChi2(0)<2.5) {
363 minPointAngle[itsindex]= 0.9999;
364 maxr[itsindex] = 10;
365 }
366 }
367 //
368 //forbid daughter kink candidates
369 //
370 if (esdtrack->GetKinkIndex(0)>0) forbidden[itsindex] = kTRUE;
371 Bool_t isElectron = kTRUE;
372 Bool_t isProton = kTRUE;
373 Double_t pid[5];
374 esdtrack->GetESDpid(pid);
375 for (Int_t i=1;i<5;i++){
376 if (pid[0]<pid[i]) isElectron= kFALSE;
377 if (pid[4]<pid[i]) isProton= kFALSE;
378 }
379 if (isElectron){
380 forbidden[itsindex]=kFALSE;
381 normdist[itsindex]*=-1;
382 }
383 if (isProton){
384 if (normdist[itsindex]>2) forbidden[itsindex]=kFALSE;
385 normdist[itsindex]*=-1;
386 }
387
388 //
389 // Causality cuts in TPC volume
390 //
391 if (esdtrack->GetTPCdensity(0,10) >0.6) maxr[itsindex] = TMath::Min(Float_t(110),maxr[itsindex]);
392 if (esdtrack->GetTPCdensity(10,30)>0.6) maxr[itsindex] = TMath::Min(Float_t(120),maxr[itsindex]);
393 if (esdtrack->GetTPCdensity(20,40)>0.6) maxr[itsindex] = TMath::Min(Float_t(130),maxr[itsindex]);
394 if (esdtrack->GetTPCdensity(30,50)>0.6) maxr[itsindex] = TMath::Min(Float_t(140),maxr[itsindex]);
395 //
396 if (esdtrack->GetTPCdensity(0,60)<0.4&&bestLong->GetNumberOfClusters()<3) minr[itsindex]=100;
397 //
398 //
399 if (kFALSE){
400 cstream<<"Track"<<
401 "Tr0.="<<best<<
402 "Tr1.="<<((bestConst)? bestConst:dummy)<<
403 "Tr2.="<<bestLong<<
404 "Tr3.="<<&trackat0<<
405 "Esd.="<<esdtrack<<
406 "Dist="<<dist[itsindex]<<
407 "ND0="<<normdist0[itsindex]<<
408 "ND1="<<normdist1[itsindex]<<
409 "ND="<<normdist[itsindex]<<
410 "Pz="<<primvertex[2]<<
411 "Forbid="<<forbidden[itsindex]<<
412 "\n";
413 //
414 }
415 trackarray.AddAt(best,itsindex);
416 trackarrayc.AddAt(bestConst,itsindex);
417 trackarrayl.AddAt(bestLong,itsindex);
418 new (&helixes[itsindex]) AliHelix(*best);
419 }
420 //
421 //
422 //
423 // first iterration of V0 finder
424 //
425 for (Int_t iesd0=0;iesd0<ntracks;iesd0++){
426 Int_t itrack0 = itsmap[iesd0];
427 if (forbidden[itrack0]) continue;
428 AliITStrackMI * btrack0 = (AliITStrackMI*)trackarray.At(itrack0);
429 if (!btrack0) continue;
430 if (btrack0->GetSign()>0 && !AliITSReconstructor::GetRecoParam()->GetStoreLikeSignV0s()) continue;
431 AliITStrackMI *trackc0 = (AliITStrackMI*)trackarrayc.At(itrack0);
432 //
433 for (Int_t iesd1=iesd0+1;iesd1<ntracks;iesd1++){
434 Int_t itrack1 = itsmap[iesd1];
435 if (forbidden[itrack1]) continue;
436
437 AliITStrackMI * btrack1 = (AliITStrackMI*)trackarray.At(itrack1);
438 if (!btrack1) continue;
439 if (btrack1->GetSign()<0 && !AliITSReconstructor::GetRecoParam()->GetStoreLikeSignV0s()) continue;
440 Bool_t isGold = kFALSE;
441 if (TMath::Abs(TMath::Abs(btrack0->GetLabel())-TMath::Abs(btrack1->GetLabel()))==1){
442 isGold = kTRUE;
443 }
444 AliITStrackMI *trackc1 = (AliITStrackMI*)trackarrayc.At(itrack1);
445 AliHelix &h1 = helixes[itrack0];
446 AliHelix &h2 = helixes[itrack1];
447 //
448 // find linear distance
449 Double_t rmin =0;
450 //
451 //
452 //
453 Double_t phase[2][2],radius[2];
454 Int_t points = h1.GetRPHIintersections(h2, phase, radius);
455 if (points==0) continue;
456 Double_t delta[2]={1000000,1000000};
457 rmin = radius[0];
458 h1.ParabolicDCA(h2,phase[0][0],phase[0][1],radius[0],delta[0]);
459 if (points==2){
460 if (radius[1]<rmin) rmin = radius[1];
461 h1.ParabolicDCA(h2,phase[1][0],phase[1][1],radius[1],delta[1]);
462 }
463 rmin = TMath::Sqrt(rmin);
464 Double_t distance = 0;
465 Double_t radiusC = 0;
466 Int_t iphase = 0;
467 if (points==1 || delta[0]<delta[1]){
468 distance = TMath::Sqrt(delta[0]);
469 radiusC = TMath::Sqrt(radius[0]);
470 }else{
471 distance = TMath::Sqrt(delta[1]);
472 radiusC = TMath::Sqrt(radius[1]);
473 iphase=1;
474 }
475 if (radiusC<TMath::Max(minr[itrack0],minr[itrack1])) continue;
476 if (radiusC>TMath::Min(maxr[itrack0],maxr[itrack1])) continue;
477 Float_t maxDist = TMath::Min(kMaxDist,Float_t(kMaxDist0+radiusC*kMaxDist1));
478 if (distance>maxDist) continue;
479 Float_t pointAngle = h1.GetPointAngle(h2,phase[iphase],primvertex);
480 if (pointAngle<TMath::Max(minPointAngle[itrack0],minPointAngle[itrack1])) continue;
481 //
482 //
483 // Double_t distance = TestV0(h1,h2,pvertex,rmin);
484 //
485 // if (distance>maxDist) continue;
486 // if (pvertex->GetRr()<kMinR) continue;
487 // if (pvertex->GetRr()>kMaxR) continue;
488 AliITStrackMI * track0=btrack0;
489 AliITStrackMI * track1=btrack1;
490 // if (pvertex->GetRr()<3.5){
491 if (radiusC<3.5){
492 //use longest tracks inside the pipe
493 track0 = (AliITStrackMI*)trackarrayl.At(itrack0);
494 track1 = (AliITStrackMI*)trackarrayl.At(itrack1);
495 }
496 //
497 //
498 pvertex->SetParamN(*track0);
499 pvertex->SetParamP(*track1);
500 pvertex->Update(primvertex);
501 pvertex->SetClusters(track0->ClIndex(),track1->ClIndex()); // register clusters
502
503 if (pvertex->GetRr()<kMinR) continue;
504 if (pvertex->GetRr()>kMaxR) continue;
505 if (pvertex->GetV0CosineOfPointingAngle()<kMinPointAngle) continue;
506//Bo: if (pvertex->GetDist2()>maxDist) continue;
507 if (pvertex->GetDcaV0Daughters()>maxDist) continue;
508//Bo: pvertex->SetLab(0,track0->GetLabel());
509//Bo: pvertex->SetLab(1,track1->GetLabel());
510 pvertex->SetIndex(0,track0->GetESDtrack()->GetID());
511 pvertex->SetIndex(1,track1->GetESDtrack()->GetID());
512 //
513 AliITStrackMI * htrackc0 = trackc0 ? trackc0:dummy;
514 AliITStrackMI * htrackc1 = trackc1 ? trackc1:dummy;
515
516 //
517 //
518 TObjArray * array0b = (TObjArray*)bestHypothesys->At(itrack0);
519 if (!array0b&&pvertex->GetRr()<40 && TMath::Abs(track0->GetTgl())<1.1) {
520 tracker->SetCurrentEsdTrack(itrack0);
521 tracker->FollowProlongationTree((AliITStrackMI*)originalTracks->At(itrack0),itrack0, kFALSE);
522 }
523 TObjArray * array1b = (TObjArray*)bestHypothesys->At(itrack1);
524 if (!array1b&&pvertex->GetRr()<40 && TMath::Abs(track1->GetTgl())<1.1) {
525 tracker->SetCurrentEsdTrack(itrack1);
526 tracker->FollowProlongationTree((AliITStrackMI*)originalTracks->At(itrack1),itrack1, kFALSE);
527 }
528 //
529 AliITStrackMI * track0b = (AliITStrackMI*)originalTracks->At(itrack0);
530 AliITStrackMI * track1b = (AliITStrackMI*)originalTracks->At(itrack1);
531 AliITStrackMI * track0l = (AliITStrackMI*)originalTracks->At(itrack0);
532 AliITStrackMI * track1l = (AliITStrackMI*)originalTracks->At(itrack1);
533
534 Float_t minchi2before0=16;
535 Float_t minchi2before1=16;
536 Float_t minchi2after0 =16;
537 Float_t minchi2after1 =16;
538 Double_t xrp[3]; pvertex->GetXYZ(xrp[0],xrp[1],xrp[2]); //I.B.
539 Int_t maxLayer = tracker->GetNearestLayer(xrp); //I.B.
540
541 if (array0b) for (Int_t i=0;i<5;i++){
542 // best track after vertex
543 AliITStrackMI * btrack = (AliITStrackMI*)array0b->At(i);
544 if (!btrack) continue;
545 if (btrack->GetNumberOfClusters()>track0l->GetNumberOfClusters()) track0l = btrack;
546 // if (btrack->fX<pvertex->GetRr()-2.-0.5/(0.1+pvertex->GetAnglep()[2])) {
547 if (btrack->GetX()<pvertex->GetRr()-2.) {
548 if ( (maxLayer>i+2|| (i==0)) && btrack->GetNumberOfClusters()==(6-i)&&i<3){
549 Float_t sumchi2= 0;
550 Float_t sumn = 0;
551 if (maxLayer<3){ // take prim vertex as additional measurement
552 if (normdist[itrack0]>0 && htrackc0){
553 sumchi2 += TMath::Min((3.-maxLayer)*normdist[itrack0]*normdist[itrack0],16.);
554 }else{
555 sumchi2 += TMath::Min((3.-maxLayer)*(3*normdist[itrack0]*normdist[itrack0]+3.),16.);
556 }
557 sumn += 3-maxLayer;
558 }
559 for (Int_t ilayer=i;ilayer<maxLayer;ilayer++){
560 sumn+=1.;
561 if (btrack->GetClIndex(ilayer)<0){
562 sumchi2+=25;
563 continue;
564 }else{
565 Int_t c=( btrack->GetClIndex(ilayer) & 0x0fffffff);
566 for (Int_t itrack=0;itrack<4;itrack++){
567 AliITStrackerMI::AliITSlayer &layer=tracker->GetLayer(ilayer);
568 if (layer.GetClusterTracks(itrack,c)>=0 && layer.GetClusterTracks(itrack,c)!=itrack0){
569 sumchi2+=18.; //shared cluster
570 break;
571 }
572 }
573 sumchi2+=btrack->GetDy(ilayer)*btrack->GetDy(ilayer)/(btrack->GetSigmaY(ilayer)*btrack->GetSigmaY(ilayer));
574 sumchi2+=btrack->GetDz(ilayer)*btrack->GetDz(ilayer)/(btrack->GetSigmaZ(ilayer)*btrack->GetSigmaZ(ilayer));
575 }
576 }
577 sumchi2/=sumn;
578 if (sumchi2<minchi2before0) minchi2before0=sumchi2;
579 }
580 continue; //safety space - Geo manager will give exact layer
581 }
582 track0b = btrack;
583 minchi2after0 = btrack->GetNormChi2(i);
584 break;
585 }
586 if (array1b) for (Int_t i=0;i<5;i++){
587 // best track after vertex
588 AliITStrackMI * btrack = (AliITStrackMI*)array1b->At(i);
589 if (!btrack) continue;
590 if (btrack->GetNumberOfClusters()>track1l->GetNumberOfClusters()) track1l = btrack;
591 // if (btrack->fX<pvertex->GetRr()-2-0.5/(0.1+pvertex->GetAnglep()[2])){
592 if (btrack->GetX()<pvertex->GetRr()-2){
593 if ((maxLayer>i+2 || (i==0))&&btrack->GetNumberOfClusters()==(6-i)&&(i<3)){
594 Float_t sumchi2= 0;
595 Float_t sumn = 0;
596 if (maxLayer<3){ // take prim vertex as additional measurement
597 if (normdist[itrack1]>0 && htrackc1){
598 sumchi2 += TMath::Min((3.-maxLayer)*normdist[itrack1]*normdist[itrack1],16.);
599 }else{
600 sumchi2 += TMath::Min((3.-maxLayer)*(3*normdist[itrack1]*normdist[itrack1]+3.),16.);
601 }
602 sumn += 3-maxLayer;
603 }
604 for (Int_t ilayer=i;ilayer<maxLayer;ilayer++){
605 sumn+=1.;
606 if (btrack->GetClIndex(ilayer)<0){
607 sumchi2+=30;
608 continue;
609 }else{
610 Int_t c=( btrack->GetClIndex(ilayer) & 0x0fffffff);
611 for (Int_t itrack=0;itrack<4;itrack++){
612 AliITStrackerMI::AliITSlayer &layer=tracker->GetLayer(ilayer);
613 if (layer.GetClusterTracks(itrack,c)>=0 && layer.GetClusterTracks(itrack,c)!=itrack1){
614 sumchi2+=18.; //shared cluster
615 break;
616 }
617 }
618 sumchi2+=btrack->GetDy(ilayer)*btrack->GetDy(ilayer)/(btrack->GetSigmaY(ilayer)*btrack->GetSigmaY(ilayer));
619 sumchi2+=btrack->GetDz(ilayer)*btrack->GetDz(ilayer)/(btrack->GetSigmaZ(ilayer)*btrack->GetSigmaZ(ilayer));
620 }
621 }
622 sumchi2/=sumn;
623 if (sumchi2<minchi2before1) minchi2before1=sumchi2;
624 }
625 continue; //safety space - Geo manager will give exact layer
626 }
627 track1b = btrack;
628 minchi2after1 = btrack->GetNormChi2(i);
629 break;
630 }
631 //
632 // position resolution - used for DCA cut
633 Float_t sigmad = track0b->GetSigmaY2()+track0b->GetSigmaZ2()+track1b->GetSigmaY2()+track1b->GetSigmaZ2()+
634 (track0b->GetX()-pvertex->GetRr())*(track0b->GetX()-pvertex->GetRr())*(track0b->GetSigmaSnp2()+track0b->GetSigmaTgl2())+
635 (track1b->GetX()-pvertex->GetRr())*(track1b->GetX()-pvertex->GetRr())*(track1b->GetSigmaSnp2()+track1b->GetSigmaTgl2());
636 sigmad =TMath::Sqrt(sigmad)+0.04;
637 if (pvertex->GetRr()>50){
638 Double_t cov0[15],cov1[15];
639 track0b->GetESDtrack()->GetInnerExternalCovariance(cov0);
640 track1b->GetESDtrack()->GetInnerExternalCovariance(cov1);
641 sigmad = cov0[0]+cov0[2]+cov1[0]+cov1[2]+
642 (80.-pvertex->GetRr())*(80.-pvertex->GetRr())*(cov0[5]+cov0[9])+
643 (80.-pvertex->GetRr())*(80.-pvertex->GetRr())*(cov1[5]+cov1[9]);
644 sigmad =TMath::Sqrt(sigmad)+0.05;
645 }
646 //
647 AliV0 vertex2;
648 vertex2.SetParamN(*track0b);
649 vertex2.SetParamP(*track1b);
650 vertex2.Update(primvertex);
651 //Bo: if (vertex2.GetDist2()<=pvertex->GetDist2()&&(vertex2.GetV0CosineOfPointingAngle()>=pvertex->GetV0CosineOfPointingAngle())){
652 if (vertex2.GetDcaV0Daughters()<=pvertex->GetDcaV0Daughters()&&(vertex2.GetV0CosineOfPointingAngle()>=pvertex->GetV0CosineOfPointingAngle())){
653 pvertex->SetParamN(*track0b);
654 pvertex->SetParamP(*track1b);
655 pvertex->Update(primvertex);
656 pvertex->SetClusters(track0b->ClIndex(),track1b->ClIndex()); // register clusters
657 pvertex->SetIndex(0,track0->GetESDtrack()->GetID());
658 pvertex->SetIndex(1,track1->GetESDtrack()->GetID());
659 }
660 pvertex->SetDistSigma(sigmad);
661 //Bo: pvertex->SetDistNorm(pvertex->GetDist2()/sigmad);
662 pvertex->SetNormDCAPrim(normdist[itrack0],normdist[itrack1]);
663 //
664 // define likelihhod and causalities
665 //
666 Float_t pa0=1, pa1=1, pb0=0.26, pb1=0.26;
667 if (maxLayer<1){
668 Float_t fnorm0 = normdist[itrack0];
669 if (fnorm0<0) fnorm0*=-3;
670 Float_t fnorm1 = normdist[itrack1];
671 if (fnorm1<0) fnorm1*=-3;
672 if ((pvertex->GetAnglep()[2]>0.1) || ( (pvertex->GetRr()<10.5)&& pvertex->GetAnglep()[2]>0.05 ) || (pvertex->GetRr()<3)){
673 pb0 = TMath::Exp(-TMath::Min(fnorm0,Float_t(16.))/12.);
674 pb1 = TMath::Exp(-TMath::Min(fnorm1,Float_t(16.))/12.);
675 }
676 pvertex->SetChi2Before(normdist[itrack0]);
677 pvertex->SetChi2After(normdist[itrack1]);
678 pvertex->SetNAfter(0);
679 pvertex->SetNBefore(0);
680 }else{
681 pvertex->SetChi2Before(minchi2before0);
682 pvertex->SetChi2After(minchi2before1);
683 if (pvertex->GetAnglep()[2]>0.1 || ( pvertex->GetRr()<10.5 && pvertex->GetAnglep()[2]>0.05) || pvertex->GetRr()<3){
684 pb0 = TMath::Exp(-TMath::Min(minchi2before0,Float_t(16))/12.);
685 pb1 = TMath::Exp(-TMath::Min(minchi2before1,Float_t(16))/12.);
686 }
687 pvertex->SetNAfter(maxLayer);
688 pvertex->SetNBefore(maxLayer);
689 }
690 if (pvertex->GetRr()<90){
691 pa0 *= TMath::Min(track0->GetESDtrack()->GetTPCdensity(0,60),Double_t(1.));
692 pa1 *= TMath::Min(track1->GetESDtrack()->GetTPCdensity(0,60),Double_t(1.));
693 }
694 if (pvertex->GetRr()<20){
695 pa0 *= (0.2+TMath::Exp(-TMath::Min(minchi2after0,Float_t(16))/8.))/1.2;
696 pa1 *= (0.2+TMath::Exp(-TMath::Min(minchi2after1,Float_t(16))/8.))/1.2;
697 }
698 //
699 pvertex->SetCausality(pb0,pb1,pa0,pa1);
700 //
701 // Likelihood calculations - apply cuts
702 //
703 Bool_t v0OK = kTRUE;
704 Float_t p12 = pvertex->GetParamP()->GetParameter()[4]*pvertex->GetParamP()->GetParameter()[4];
705 p12 += pvertex->GetParamN()->GetParameter()[4]*pvertex->GetParamN()->GetParameter()[4];
706 p12 = TMath::Sqrt(p12); // "mean" momenta
707 Float_t sigmap0 = 0.0001+0.001/(0.1+pvertex->GetRr());
708 Float_t sigmap = 0.5*sigmap0*(0.6+0.4*p12); // "resolution: of point angle - as a function of radius and momenta
709
710 Float_t causalityA = (1.0-pvertex->GetCausalityP()[0])*(1.0-pvertex->GetCausalityP()[1]);
711 Float_t causalityB = TMath::Sqrt(TMath::Min(pvertex->GetCausalityP()[2],Double_t(0.7))*
712 TMath::Min(pvertex->GetCausalityP()[3],Double_t(0.7)));
713 //
714 //Bo: Float_t likelihood0 = (TMath::Exp(-pvertex->GetDistNorm())+0.1) *(pvertex->GetDist2()<0.5)*(pvertex->GetDistNorm()<5);
715 Float_t lDistNorm = pvertex->GetDcaV0Daughters()/pvertex->GetDistSigma();
716 Float_t likelihood0 = (TMath::Exp(-lDistNorm)+0.1) *(pvertex->GetDcaV0Daughters()<0.5)*(lDistNorm<5);
717
718 Float_t likelihood1 = TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/sigmap)+
719 0.4*TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/(4.*sigmap))+
720 0.4*TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/(8.*sigmap))+
721 0.1*TMath::Exp(-(1.0001-pvertex->GetV0CosineOfPointingAngle())/0.01);
722 //
723 if (causalityA<kCausality0Cut) v0OK = kFALSE;
724 if (TMath::Sqrt(likelihood0*likelihood1)<kLikelihood01Cut) v0OK = kFALSE;
725 if (likelihood1<kLikelihood1Cut) v0OK = kFALSE;
726 if (TMath::Power(likelihood0*likelihood1*causalityB,0.33)<kCombinedCut) v0OK = kFALSE;
727
728 //
729 //
730 if (kFALSE){
731 Bool_t gold = TMath::Abs(TMath::Abs(track0->GetLabel())-TMath::Abs(track1->GetLabel()))==1;
732 cstream<<"It0"<<
733 "Tr0.="<<track0<< //best without constrain
734 "Tr1.="<<track1<< //best without constrain
735 "Tr0B.="<<track0b<< //best without constrain after vertex
736 "Tr1B.="<<track1b<< //best without constrain after vertex
737 "Tr0C.="<<htrackc0<< //best with constrain if exist
738 "Tr1C.="<<htrackc1<< //best with constrain if exist
739 "Tr0L.="<<track0l<< //longest best
740 "Tr1L.="<<track1l<< //longest best
741 "Esd0.="<<track0->GetESDtrack()<< // esd track0 params
742 "Esd1.="<<track1->GetESDtrack()<< // esd track1 params
743 "V0.="<<pvertex<< //vertex properties
744 "V0b.="<<&vertex2<< //vertex properties at "best" track
745 "ND0="<<normdist[itrack0]<< //normalize distance for track0
746 "ND1="<<normdist[itrack1]<< //normalize distance for track1
747 "Gold="<<gold<< //
748 // "RejectBase="<<rejectBase<< //rejection in First itteration
749 "OK="<<v0OK<<
750 "rmin="<<rmin<<
751 "sigmad="<<sigmad<<
752 "\n";
753 }
754 //if (rejectBase) continue;
755 //
756 pvertex->SetStatus(0);
757 // if (rejectBase) {
758 // pvertex->SetStatus(-100);
759 //}
760 if (pvertex->GetV0CosineOfPointingAngle()>kMinPointAngle2) {
761 //Bo: pvertex->SetESDindexes(track0->GetESDtrack()->GetID(),track1->GetESDtrack()->GetID());
762 pvertex->SetIndex(0,track0->GetESDtrack()->GetID());//Bo: consistency 0 for neg
763 pvertex->SetIndex(1,track1->GetESDtrack()->GetID());//Bo: consistency 1 for pos
764 if (v0OK){
765 // AliV0vertex vertexjuri(*track0,*track1);
766 // vertexjuri.SetESDindexes(track0->fESDtrack->GetID(),track1->fESDtrack->GetID());
767 // event->AddV0(&vertexjuri);
768 pvertex->SetStatus(100);
769 }
770 pvertex->SetOnFlyStatus(kTRUE);
771 pvertex->ChangeMassHypothesis(kK0Short);
772 event->AddV0(pvertex);
773 }
774 }
775 }
776 //
777 //
778 // delete temporary arrays
779 //
780 delete[] forbidden;
781 delete[] minPointAngle;
782 delete[] maxr;
783 delete[] minr;
784 delete[] norm;
785 delete[] normdist;
786 delete[] normdist1;
787 delete[] normdist0;
788 delete[] dist;
789 delete[] itsmap;
790 delete[] helixes;
791 delete pvertex;
792}
793//------------------------------------------------------------------------
794void AliITSV0Finder::RefitV02(const AliESDEvent *event,
795 AliITStrackerMI *tracker)
796{
797 //
798 //try to refit V0s in the third path of the reconstruction
799 //
800 TTreeSRedirector &cstream = *(tracker->GetDebugStreamer());
801 //
802 Int_t nv0s = event->GetNumberOfV0s();
803 Float_t primvertex[3]={tracker->GetX(),tracker->GetY(),tracker->GetZ()};
804 AliV0 v0temp;
805 for (Int_t iv0 = 0; iv0<nv0s;iv0++){
806 AliV0 * v0mi = (AliV0*)event->GetV0(iv0);
807 if (!v0mi) continue;
808 Int_t itrack0 = v0mi->GetIndex(0);
809 Int_t itrack1 = v0mi->GetIndex(1);
810 AliESDtrack *esd0 = event->GetTrack(itrack0);
811 AliESDtrack *esd1 = event->GetTrack(itrack1);
812 if (!esd0||!esd1) continue;
813 AliITStrackMI tpc0(*esd0);
814 AliITStrackMI tpc1(*esd1);
815 Double_t x,y,z; v0mi->GetXYZ(x,y,z); //I.B.
816 Double_t alpha =TMath::ATan2(y,x); //I.B.
817 if (v0mi->GetRr()>85){
818 if (tpc0.Propagate(alpha,v0mi->GetRr())&&tpc1.Propagate(alpha,v0mi->GetRr())){
819 v0temp.SetParamN(tpc0);
820 v0temp.SetParamP(tpc1);
821 v0temp.Update(primvertex);
822 if (kFALSE) cstream<<"Refit"<<
823 "V0.="<<v0mi<<
824 "V0refit.="<<&v0temp<<
825 "Tr0.="<<&tpc0<<
826 "Tr1.="<<&tpc1<<
827 "\n";
828 //Bo: if (v0temp.GetDist2()<v0mi->GetDist2() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){
829 if (v0temp.GetDcaV0Daughters()<v0mi->GetDcaV0Daughters() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){
830 v0mi->SetParamN(tpc0);
831 v0mi->SetParamP(tpc1);
832 v0mi->Update(primvertex);
833 }
834 }
835 continue;
836 }
837 if (v0mi->GetRr()>35){
838 AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc0);
839 AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc1);
840 if (tpc0.Propagate(alpha,v0mi->GetRr())&&tpc1.Propagate(alpha,v0mi->GetRr())){
841 v0temp.SetParamN(tpc0);
842 v0temp.SetParamP(tpc1);
843 v0temp.Update(primvertex);
844 if (kFALSE) cstream<<"Refit"<<
845 "V0.="<<v0mi<<
846 "V0refit.="<<&v0temp<<
847 "Tr0.="<<&tpc0<<
848 "Tr1.="<<&tpc1<<
849 "\n";
850 //Bo: if (v0temp.GetDist2()<v0mi->GetDist2() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){
851 if (v0temp.GetDcaV0Daughters()<v0mi->GetDcaV0Daughters() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){
852 v0mi->SetParamN(tpc0);
853 v0mi->SetParamP(tpc1);
854 v0mi->Update(primvertex);
855 }
856 }
857 continue;
858 }
859 AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc0);
860 AliITStrackerMI::CorrectForTPCtoITSDeadZoneMaterial(&tpc1);
861 // if (tpc0.Propagate(alpha,v0mi->GetRr())&&tpc1.Propagate(alpha,v0mi->GetRr())){
862 if (tracker->RefitAt(v0mi->GetRr(),&tpc0, v0mi->GetClusters(0)) &&
863 tracker->RefitAt(v0mi->GetRr(),&tpc1, v0mi->GetClusters(1))){
864 v0temp.SetParamN(tpc0);
865 v0temp.SetParamP(tpc1);
866 v0temp.Update(primvertex);
867 if (kFALSE) cstream<<"Refit"<<
868 "V0.="<<v0mi<<
869 "V0refit.="<<&v0temp<<
870 "Tr0.="<<&tpc0<<
871 "Tr1.="<<&tpc1<<
872 "\n";
873 //Bo: if (v0temp.GetDist2()<v0mi->GetDist2() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){
874 if (v0temp.GetDcaV0Daughters()<v0mi->GetDcaV0Daughters() || v0temp.GetV0CosineOfPointingAngle()>v0mi->GetV0CosineOfPointingAngle()){
875 v0mi->SetParamN(tpc0);
876 v0mi->SetParamP(tpc1);
877 v0mi->Update(primvertex);
878 }
879 }
880 }
881}
882//------------------------------------------------------------------------