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Added check for ppad[1] range
[u/mrichter/AliRoot.git] / TPC / AliTPCtracker.cxx
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73042f01 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$Log$
f38c8ae5 18Revision 1.13 2001/07/23 12:01:30 hristov
19Initialisation added
20
7afb86d1 21Revision 1.12 2001/07/20 14:32:44 kowal2
22Processing of many events possible now
23
afc42102 24Revision 1.11 2001/05/23 08:50:10 hristov
25Weird inline removed
26
bdbd0f7a 27Revision 1.10 2001/05/16 14:57:25 alibrary
28New files for folders and Stack
29
9e1a0ddb 30Revision 1.9 2001/05/11 07:16:56 hristov
31Fix needed on Sun and Alpha
32
3d39dd8b 33Revision 1.8 2001/05/08 15:00:15 hristov
34Corrections for tracking in arbitrary magnenetic field. Changes towards a concept of global Alice track. Back propagation of reconstructed tracks (Yu.Belikov)
35
be9c5115 36Revision 1.5 2000/12/20 07:51:59 kowal2
37Changes suggested by Alessandra and Paolo to avoid overlapped
38data fields in encapsulated classes.
39
d4cf1daa 40Revision 1.4 2000/11/02 07:27:16 kowal2
41code corrections
42
98ab53f4 43Revision 1.2 2000/06/30 12:07:50 kowal2
44Updated from the TPC-PreRelease branch
45
73042f01 46Revision 1.1.2.1 2000/06/25 08:53:55 kowal2
47Splitted from AliTPCtracking
48
49*/
50
51//-------------------------------------------------------
52// Implementation of the TPC tracker
53//
54// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
55//-------------------------------------------------------
56
73042f01 57#include <TObjArray.h>
58#include <TFile.h>
be5b9287 59#include <TTree.h>
60#include <iostream.h>
61
62#include "AliTPCtracker.h"
63#include "AliTPCcluster.h"
b9de75e1 64#include "AliTPCParam.h"
73042f01 65#include "AliTPCClustersRow.h"
66
b9de75e1 67//_____________________________________________________________________________
afc42102 68AliTPCtracker::AliTPCtracker(const AliTPCParam *par, Int_t eventn):
b9de75e1 69fkNIS(par->GetNInnerSector()/2),
70fkNOS(par->GetNOuterSector()/2)
71{
72 //---------------------------------------------------------------------
73 // The main TPC tracker constructor
74 //---------------------------------------------------------------------
75 fInnerSec=new AliTPCSector[fkNIS];
76 fOuterSec=new AliTPCSector[fkNOS];
77
78 Int_t i;
79 for (i=0; i<fkNIS; i++) fInnerSec[i].Setup(par,0);
80 for (i=0; i<fkNOS; i++) fOuterSec[i].Setup(par,1);
81
82 fN=0; fSectors=0;
83
84 fClustersArray.Setup(par);
85 fClustersArray.SetClusterType("AliTPCcluster");
b9de75e1 86
afc42102 87 char cname[100];
88 if (eventn==-1) {
89 sprintf(cname,"TreeC_TPC");
90 }
91 else {
92 sprintf(cname,"TreeC_TPC_%d",eventn);
93 }
94
95 fClustersArray.ConnectTree(cname);
96
97 fEventN = eventn;
b9de75e1 98 fSeeds=0;
99}
100
101//_____________________________________________________________________________
102AliTPCtracker::~AliTPCtracker() {
103 //------------------------------------------------------------------
104 // TPC tracker destructor
105 //------------------------------------------------------------------
106 delete[] fInnerSec;
107 delete[] fOuterSec;
108 delete fSeeds;
109}
73042f01 110
111//_____________________________________________________________________________
112Double_t SigmaY2(Double_t r, Double_t tgl, Double_t pt)
113{
114 //
115 // Parametrised error of the cluster reconstruction (pad direction)
116 //
117 // Sigma rphi
118 const Float_t kArphi=0.41818e-2;
119 const Float_t kBrphi=0.17460e-4;
120 const Float_t kCrphi=0.30993e-2;
121 const Float_t kDrphi=0.41061e-3;
122
123 pt=TMath::Abs(pt)*1000.;
124 Double_t x=r/pt;
125 tgl=TMath::Abs(tgl);
126 Double_t s=kArphi - kBrphi*r*tgl + kCrphi*x*x + kDrphi*x;
127 if (s<0.4e-3) s=0.4e-3;
128 s*=1.3; //Iouri Belikov
129
130 return s;
131}
132
133//_____________________________________________________________________________
134Double_t SigmaZ2(Double_t r, Double_t tgl)
135{
136 //
137 // Parametrised error of the cluster reconstruction (drift direction)
138 //
139 // Sigma z
140 const Float_t kAz=0.39614e-2;
141 const Float_t kBz=0.22443e-4;
142 const Float_t kCz=0.51504e-1;
143
144
145 tgl=TMath::Abs(tgl);
146 Double_t s=kAz - kBz*r*tgl + kCz*tgl*tgl;
147 if (s<0.4e-3) s=0.4e-3;
148 s*=1.3; //Iouri Belikov
149
150 return s;
151}
152
153//_____________________________________________________________________________
bdbd0f7a 154Double_t f1(Double_t x1,Double_t y1,
73042f01 155 Double_t x2,Double_t y2,
156 Double_t x3,Double_t y3)
157{
158 //-----------------------------------------------------------------
159 // Initial approximation of the track curvature
160 //-----------------------------------------------------------------
161 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
162 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
163 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
164 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
165 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
166
167 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
168
169 return -xr*yr/sqrt(xr*xr+yr*yr);
170}
171
172
173//_____________________________________________________________________________
bdbd0f7a 174Double_t f2(Double_t x1,Double_t y1,
73042f01 175 Double_t x2,Double_t y2,
176 Double_t x3,Double_t y3)
177{
178 //-----------------------------------------------------------------
179 // Initial approximation of the track curvature times center of curvature
180 //-----------------------------------------------------------------
181 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
182 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
183 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
184 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
185 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
186
187 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
188
189 return -a/(d*y1-b)*xr/sqrt(xr*xr+yr*yr);
190}
191
192//_____________________________________________________________________________
bdbd0f7a 193Double_t f3(Double_t x1,Double_t y1,
73042f01 194 Double_t x2,Double_t y2,
195 Double_t z1,Double_t z2)
196{
197 //-----------------------------------------------------------------
198 // Initial approximation of the tangent of the track dip angle
199 //-----------------------------------------------------------------
200 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
201}
202
203//_____________________________________________________________________________
b9de75e1 204void AliTPCtracker::LoadOuterSectors() {
205 //-----------------------------------------------------------------
206 // This function fills outer TPC sectors with clusters.
207 //-----------------------------------------------------------------
208 UInt_t index;
209 Int_t j=Int_t(fClustersArray.GetTree()->GetEntries());
210 for (Int_t i=0; i<j; i++) {
211 AliSegmentID *s=fClustersArray.LoadEntry(i);
212 Int_t sec,row;
213 AliTPCParam *par=(AliTPCParam*)fClustersArray.GetParam();
214 par->AdjustSectorRow(s->GetID(),sec,row);
215 if (sec<fkNIS*2) continue;
216 AliTPCClustersRow *clrow=fClustersArray.GetRow(sec,row);
217 Int_t ncl=clrow->GetArray()->GetEntriesFast();
218 while (ncl--) {
219 AliTPCcluster *c=(AliTPCcluster*)(*clrow)[ncl];
220 index=(((sec<<8)+row)<<16)+ncl;
221 fOuterSec[(sec-fkNIS*2)%fkNOS][row].InsertCluster(c,index);
222 }
223 }
224
225 fN=fkNOS;
226 fSectors=fOuterSec;
227}
228
229//_____________________________________________________________________________
230void AliTPCtracker::UnloadOuterSectors() {
231 //-----------------------------------------------------------------
232 // This function clears outer TPC sectors.
233 //-----------------------------------------------------------------
234 Int_t nup=fOuterSec->GetNRows();
235 for (Int_t i=0; i<fkNOS; i++) {
236 for (Int_t j=0; j<nup; j++) {
237 if (fClustersArray.GetRow(i+fkNIS*2,j))
238 fClustersArray.ClearRow(i+fkNIS*2,j);
239 if (fClustersArray.GetRow(i+fkNIS*2+fkNOS,j))
240 fClustersArray.ClearRow(i+fkNIS*2+fkNOS,j);
241 }
242 }
243
244 fN=0;
245 fSectors=0;
246}
247
248//_____________________________________________________________________________
249void AliTPCtracker::LoadInnerSectors() {
250 //-----------------------------------------------------------------
251 // This function fills inner TPC sectors with clusters.
252 //-----------------------------------------------------------------
253 UInt_t index;
254 Int_t j=Int_t(fClustersArray.GetTree()->GetEntries());
255 for (Int_t i=0; i<j; i++) {
256 AliSegmentID *s=fClustersArray.LoadEntry(i);
257 Int_t sec,row;
258 AliTPCParam *par=(AliTPCParam*)fClustersArray.GetParam();
259 par->AdjustSectorRow(s->GetID(),sec,row);
260 if (sec>=fkNIS*2) continue;
261 AliTPCClustersRow *clrow=fClustersArray.GetRow(sec,row);
262 Int_t ncl=clrow->GetArray()->GetEntriesFast();
263 while (ncl--) {
264 AliTPCcluster *c=(AliTPCcluster*)(*clrow)[ncl];
265 index=(((sec<<8)+row)<<16)+ncl;
266 fInnerSec[sec%fkNIS][row].InsertCluster(c,index);
267 }
268 }
269
270 fN=fkNIS;
271 fSectors=fInnerSec;
272}
273
274//_____________________________________________________________________________
275void AliTPCtracker::UnloadInnerSectors() {
276 //-----------------------------------------------------------------
277 // This function clears inner TPC sectors.
278 //-----------------------------------------------------------------
279 Int_t nlow=fInnerSec->GetNRows();
280 for (Int_t i=0; i<fkNIS; i++) {
281 for (Int_t j=0; j<nlow; j++) {
282 if (fClustersArray.GetRow(i,j)) fClustersArray.ClearRow(i,j);
283 if (fClustersArray.GetRow(i+fkNIS,j)) fClustersArray.ClearRow(i+fkNIS,j);
284 }
285 }
286
287 fN=0;
288 fSectors=0;
289}
290
291//_____________________________________________________________________________
292Int_t AliTPCtracker::FollowProlongation(AliTPCseed& t, Int_t rf) {
73042f01 293 //-----------------------------------------------------------------
294 // This function tries to find a track prolongation.
295 //-----------------------------------------------------------------
b9de75e1 296 Double_t xt=t.GetX();
297 const Int_t kSKIP=(t.GetNumberOfClusters()<10) ? kRowsToSkip :
298 Int_t(0.5*fSectors->GetNRows());
73042f01 299 Int_t tryAgain=kSKIP;
73042f01 300
b9de75e1 301 Double_t alpha=t.GetAlpha() - fSectors->GetAlphaShift();
302 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
303 if (alpha < 0. ) alpha += 2.*TMath::Pi();
304 Int_t s=Int_t(alpha/fSectors->GetAlpha())%fN;
305
306 for (Int_t nr=fSectors->GetRowNumber(xt)-1; nr>=rf; nr--) {
307 Double_t x=fSectors->GetX(nr), ymax=fSectors->GetMaxY(nr);
73042f01 308 if (!t.PropagateTo(x)) return 0;
309
310 AliTPCcluster *cl=0;
311 UInt_t index=0;
b9de75e1 312 Double_t maxchi2=kMaxCHI2;
313 const AliTPCRow &krow=fSectors[s][nr];
314 Double_t pt=t.GetConvConst()/(100/0.299792458/0.2)/t.Get1Pt();
315 Double_t sy2=SigmaY2(t.GetX(),t.GetTgl(),pt);
73042f01 316 Double_t sz2=SigmaZ2(t.GetX(),t.GetTgl());
317 Double_t road=4.*sqrt(t.GetSigmaY2() + sy2), y=t.GetY(), z=t.GetZ();
318
b9de75e1 319 if (road>kMaxROAD) {
73042f01 320 if (t.GetNumberOfClusters()>4)
321 cerr<<t.GetNumberOfClusters()
322 <<"FindProlongation warning: Too broad road !\n";
323 return 0;
324 }
325
326 if (krow) {
327 for (Int_t i=krow.Find(y-road); i<krow; i++) {
be5b9287 328 AliTPCcluster *c=(AliTPCcluster*)(krow[i]);
73042f01 329 if (c->GetY() > y+road) break;
330 if (c->IsUsed()) continue;
331 if ((c->GetZ()-z)*(c->GetZ()-z) > 16.*(t.GetSigmaZ2()+sz2)) continue;
332 Double_t chi2=t.GetPredictedChi2(c);
333 if (chi2 > maxchi2) continue;
334 maxchi2=chi2;
335 cl=c;
336 index=krow.GetIndex(i);
337 }
338 }
339 if (cl) {
b9de75e1 340 Float_t l=fSectors->GetPadPitchWidth();
73042f01 341 t.SetSampledEdx(cl->GetQ()/l,t.GetNumberOfClusters());
be9c5115 342 if (!t.Update(cl,maxchi2,index)) {
343 if (!tryAgain--) return 0;
344 } else tryAgain=kSKIP;
73042f01 345 } else {
346 if (tryAgain==0) break;
347 if (y > ymax) {
b9de75e1 348 s = (s+1) % fN;
349 if (!t.Rotate(fSectors->GetAlpha())) return 0;
73042f01 350 } else if (y <-ymax) {
b9de75e1 351 s = (s-1+fN) % fN;
352 if (!t.Rotate(-fSectors->GetAlpha())) return 0;
73042f01 353 }
354 tryAgain--;
355 }
356 }
357
358 return 1;
b9de75e1 359}
360
361//_____________________________________________________________________________
362Int_t AliTPCtracker::FollowBackProlongation
363(AliTPCseed& seed, const AliTPCtrack &track) {
364 //-----------------------------------------------------------------
365 // This function propagates tracks back through the TPC
366 //-----------------------------------------------------------------
367 Double_t alpha=seed.GetAlpha() - fSectors->GetAlphaShift();
368 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
369 if (alpha < 0. ) alpha += 2.*TMath::Pi();
370 Int_t s=Int_t(alpha/fSectors->GetAlpha())%fN;
371
372 Int_t idx=-1, sec=-1, row=-1;
373 Int_t nc=seed.GetLabel(); //index of the cluster to start with
374 if (nc--) {
375 idx=track.GetClusterIndex(nc);
376 sec=(idx&0xff000000)>>24; row=(idx&0x00ff0000)>>16;
377 }
378 if (fSectors==fInnerSec) { if (sec >= 2*fkNIS) row=-1; }
379 else { if (sec < 2*fkNIS) row=-1; }
380
381 Int_t nr=fSectors->GetNRows();
382 for (Int_t i=0; i<nr; i++) {
383 Double_t x=fSectors->GetX(i), ymax=fSectors->GetMaxY(i);
384
385 if (!seed.PropagateTo(x)) return 0;
386
387 Double_t y=seed.GetY();
388 if (y > ymax) {
389 s = (s+1) % fN;
390 if (!seed.Rotate(fSectors->GetAlpha())) return 0;
391 } else if (y <-ymax) {
392 s = (s-1+fN) % fN;
393 if (!seed.Rotate(-fSectors->GetAlpha())) return 0;
394 }
395
396 AliTPCcluster *cl=0;
397 Int_t index=0;
398 Double_t maxchi2=kMaxCHI2;
399 Double_t pt=seed.GetConvConst()/(100/0.299792458/0.2)/seed.Get1Pt();
400 Double_t sy2=SigmaY2(seed.GetX(),seed.GetTgl(),pt);
401 Double_t sz2=SigmaZ2(seed.GetX(),seed.GetTgl());
402 Double_t road=4.*sqrt(seed.GetSigmaY2() + sy2), z=seed.GetZ();
403 if (road>kMaxROAD) {
404 cerr<<seed.GetNumberOfClusters()
405 <<"AliTPCtracker::FollowBackProlongation: Too broad road !\n";
406 return 0;
407 }
408
409
410 Int_t accepted=seed.GetNumberOfClusters();
411 if (row==i) {
412 //try to accept already found cluster
413 AliTPCcluster *c=(AliTPCcluster*)GetCluster(idx);
414 Double_t chi2;
415 if ((chi2=seed.GetPredictedChi2(c))<maxchi2 || accepted<27) {
416 index=idx; cl=c; maxchi2=chi2;
417 } //else cerr<<"AliTPCtracker::FollowBackProlongation: oulier !\n";
418
419 if (nc--) {
420 idx=track.GetClusterIndex(nc);
421 sec=(idx&0xff000000)>>24; row=(idx&0x00ff0000)>>16;
422 }
423 if (fSectors==fInnerSec) { if (sec >= 2*fkNIS) row=-1; }
424 else { if (sec < 2*fkNIS) row=-1; }
73042f01 425
b9de75e1 426 }
427 if (!cl) {
428 //try to fill the gap
429 const AliTPCRow &krow=fSectors[s][i];
430 if (accepted>27)
431 if (krow) {
432 for (Int_t i=krow.Find(y-road); i<krow; i++) {
433 AliTPCcluster *c=(AliTPCcluster*)(krow[i]);
434 if (c->GetY() > y+road) break;
435 if (c->IsUsed()) continue;
436 if ((c->GetZ()-z)*(c->GetZ()-z)>16.*(seed.GetSigmaZ2()+sz2)) continue;
437 Double_t chi2=seed.GetPredictedChi2(c);
438 if (chi2 > maxchi2) continue;
439 maxchi2=chi2;
440 cl=c;
441 index=krow.GetIndex(i);
442 }
443 }
444 }
445
446 if (cl) {
447 Float_t l=fSectors->GetPadPitchWidth();
448 seed.SetSampledEdx(cl->GetQ()/l,seed.GetNumberOfClusters());
449 seed.Update(cl,maxchi2,index);
450 }
451
452 }
453
454 seed.SetLabel(nc);
455
456 return 1;
73042f01 457}
458
459//_____________________________________________________________________________
b9de75e1 460void AliTPCtracker::MakeSeeds(Int_t i1, Int_t i2) {
73042f01 461 //-----------------------------------------------------------------
462 // This function creates track seeds.
463 //-----------------------------------------------------------------
b9de75e1 464 if (fSeeds==0) fSeeds=new TObjArray(15000);
465
73042f01 466 Double_t x[5], c[15];
467
b9de75e1 468 Double_t alpha=fOuterSec->GetAlpha(), shift=fOuterSec->GetAlphaShift();
73042f01 469 Double_t cs=cos(alpha), sn=sin(alpha);
470
b9de75e1 471 Double_t x1 =fOuterSec->GetX(i1);
472 Double_t xx2=fOuterSec->GetX(i2);
73042f01 473
b9de75e1 474 for (Int_t ns=0; ns<fkNOS; ns++) {
475 Int_t nl=fOuterSec[(ns-1+fkNOS)%fkNOS][i2];
476 Int_t nm=fOuterSec[ns][i2];
477 Int_t nu=fOuterSec[(ns+1)%fkNOS][i2];
478 const AliTPCRow& kr1=fOuterSec[ns][i1];
73042f01 479 for (Int_t is=0; is < kr1; is++) {
480 Double_t y1=kr1[is]->GetY(), z1=kr1[is]->GetZ();
481 for (Int_t js=0; js < nl+nm+nu; js++) {
482 const AliTPCcluster *kcl;
483 Double_t x2, y2, z2;
484 Double_t x3=0.,y3=0.;
485
486 if (js<nl) {
b9de75e1 487 const AliTPCRow& kr2=fOuterSec[(ns-1+fkNOS)%fkNOS][i2];
73042f01 488 kcl=kr2[js];
489 y2=kcl->GetY(); z2=kcl->GetZ();
490 x2= xx2*cs+y2*sn;
491 y2=-xx2*sn+y2*cs;
492 } else
493 if (js<nl+nm) {
b9de75e1 494 const AliTPCRow& kr2=fOuterSec[ns][i2];
73042f01 495 kcl=kr2[js-nl];
496 x2=xx2; y2=kcl->GetY(); z2=kcl->GetZ();
497 } else {
b9de75e1 498 const AliTPCRow& kr2=fOuterSec[(ns+1)%fkNOS][i2];
73042f01 499 kcl=kr2[js-nl-nm];
500 y2=kcl->GetY(); z2=kcl->GetZ();
501 x2=xx2*cs-y2*sn;
502 y2=xx2*sn+y2*cs;
503 }
504
505 Double_t zz=z1 - z1/x1*(x1-x2);
506 if (TMath::Abs(zz-z2)>5.) continue;
507
508 Double_t d=(x2-x1)*(0.-y2)-(0.-x2)*(y2-y1);
509 if (d==0.) {cerr<<"MakeSeeds warning: Straight seed !\n"; continue;}
510
511 x[0]=y1;
512 x[1]=z1;
b9de75e1 513 x[4]=f1(x1,y1,x2,y2,x3,y3);
514 if (TMath::Abs(x[4]) >= 0.0066) continue;
be5b9287 515 x[2]=f2(x1,y1,x2,y2,x3,y3);
b9de75e1 516 //if (TMath::Abs(x[4]*x1-x[2]) >= 0.99999) continue;
517 x[3]=f3(x1,y1,x2,y2,z1,z2);
518 if (TMath::Abs(x[3]) > 1.2) continue;
be5b9287 519 Double_t a=asin(x[2]);
b9de75e1 520 Double_t zv=z1 - x[3]/x[4]*(a+asin(x[4]*x1-x[2]));
73042f01 521 if (TMath::Abs(zv)>10.) continue;
522
523 Double_t sy1=kr1[is]->GetSigmaY2(), sz1=kr1[is]->GetSigmaZ2();
524 Double_t sy2=kcl->GetSigmaY2(), sz2=kcl->GetSigmaZ2();
525 Double_t sy3=100*0.025, sy=0.1, sz=0.1;
526
b9de75e1 527 Double_t f40=(f1(x1,y1+sy,x2,y2,x3,y3)-x[4])/sy;
528 Double_t f42=(f1(x1,y1,x2,y2+sy,x3,y3)-x[4])/sy;
529 Double_t f43=(f1(x1,y1,x2,y2,x3,y3+sy)-x[4])/sy;
be5b9287 530 Double_t f20=(f2(x1,y1+sy,x2,y2,x3,y3)-x[2])/sy;
531 Double_t f22=(f2(x1,y1,x2,y2+sy,x3,y3)-x[2])/sy;
b9de75e1 532 Double_t f23=(f2(x1,y1,x2,y2,x3,y3+sy)-x[2])/sy;
533 Double_t f30=(f3(x1,y1+sy,x2,y2,z1,z2)-x[3])/sy;
534 Double_t f31=(f3(x1,y1,x2,y2,z1+sz,z2)-x[3])/sz;
535 Double_t f32=(f3(x1,y1,x2,y2+sy,z1,z2)-x[3])/sy;
536 Double_t f34=(f3(x1,y1,x2,y2,z1,z2+sz)-x[3])/sz;
73042f01 537
538 c[0]=sy1;
539 c[1]=0.; c[2]=sz1;
b9de75e1 540 c[3]=f20*sy1; c[4]=0.; c[5]=f20*sy1*f20+f22*sy2*f22+f23*sy3*f23;
541 c[6]=f30*sy1; c[7]=f31*sz1; c[8]=f30*sy1*f20+f32*sy2*f22;
542 c[9]=f30*sy1*f30+f31*sz1*f31+f32*sy2*f32+f34*sz2*f34;
543 c[10]=f40*sy1; c[11]=0.; c[12]=f40*sy1*f20+f42*sy2*f22+f43*sy3*f23;
544 c[13]=f30*sy1*f40+f32*sy2*f42;
545 c[14]=f40*sy1*f40+f42*sy2*f42+f43*sy3*f43;
73042f01 546
547 UInt_t index=kr1.GetIndex(is);
548 AliTPCseed *track=new AliTPCseed(index, x, c, x1, ns*alpha+shift);
b9de75e1 549 Float_t l=fOuterSec->GetPadPitchWidth();
73042f01 550 track->SetSampledEdx(kr1[is]->GetQ()/l,0);
551
b9de75e1 552 Int_t rc=FollowProlongation(*track, i2);
be9c5115 553 if (rc==0 || track->GetNumberOfClusters()<(i1-i2)/2) delete track;
b9de75e1 554 else fSeeds->AddLast(track);
73042f01 555 }
556 }
557 }
558}
559
560//_____________________________________________________________________________
b9de75e1 561Int_t AliTPCtracker::ReadSeeds(const TFile *inp) {
73042f01 562 //-----------------------------------------------------------------
b9de75e1 563 // This function reades track seeds.
73042f01 564 //-----------------------------------------------------------------
565 TDirectory *savedir=gDirectory;
566
b9de75e1 567 TFile *in=(TFile*)inp;
568 if (!in->IsOpen()) {
569 cerr<<"AliTPCtracker::ReadSeeds(): input file is not open !\n";
be5b9287 570 return 1;
73042f01 571 }
572
b9de75e1 573 in->cd();
574 TTree *seedTree=(TTree*)in->Get("Seeds");
575 if (!seedTree) {
576 cerr<<"AliTPCtracker::ReadSeeds(): ";
577 cerr<<"can't get a tree with track seeds !\n";
578 return 2;
579 }
580 AliTPCtrack *seed=new AliTPCtrack;
581 seedTree->SetBranchAddress("tracks",&seed);
582
583 if (fSeeds==0) fSeeds=new TObjArray(15000);
73042f01 584
b9de75e1 585 Int_t n=(Int_t)seedTree->GetEntries();
586 for (Int_t i=0; i<n; i++) {
587 seedTree->GetEvent(i);
588 fSeeds->AddLast(new AliTPCseed(*seed,seed->GetAlpha()));
589 }
590
591 delete seed;
f38c8ae5 592
593 delete seedTree; //Thanks to Mariana Bondila
594
b9de75e1 595 savedir->cd();
73042f01 596
b9de75e1 597 return 0;
598}
73042f01 599
b9de75e1 600//_____________________________________________________________________________
601Int_t AliTPCtracker::Clusters2Tracks(const TFile *inp, TFile *out) {
602 //-----------------------------------------------------------------
603 // This is a track finder.
604 //-----------------------------------------------------------------
605 TDirectory *savedir=gDirectory;
73042f01 606
b9de75e1 607 if (inp) {
608 TFile *in=(TFile*)inp;
609 if (!in->IsOpen()) {
610 cerr<<"AliTPCtracker::Clusters2Tracks(): input file is not open !\n";
611 return 1;
612 }
613 }
73042f01 614
b9de75e1 615 if (!out->IsOpen()) {
616 cerr<<"AliTPCtracker::Clusters2Tracks(): output file is not open !\n";
617 return 2;
73042f01 618 }
619
b9de75e1 620 out->cd();
621 TTree tracktree("TPCf","Tree with TPC tracks");
622 AliTPCtrack *iotrack=0;
623 tracktree.Branch("tracks","AliTPCtrack",&iotrack,32000,0);
624
625 LoadOuterSectors();
626
73042f01 627 //find track seeds
b9de75e1 628 Int_t nup=fOuterSec->GetNRows(), nlow=fInnerSec->GetNRows();
73042f01 629 Int_t nrows=nlow+nup;
b9de75e1 630 if (fSeeds==0) {
631 Int_t gap=Int_t(0.125*nrows), shift=Int_t(0.5*gap);
632 MakeSeeds(nup-1, nup-1-gap);
633 MakeSeeds(nup-1-shift, nup-1-shift-gap);
634 }
635 fSeeds->Sort();
73042f01 636
637 //tracking in outer sectors
b9de75e1 638 Int_t nseed=fSeeds->GetEntriesFast();
639 Int_t i;
73042f01 640 for (i=0; i<nseed; i++) {
b9de75e1 641 AliTPCseed *pt=(AliTPCseed*)fSeeds->UncheckedAt(i), &t=*pt;
642 if (FollowProlongation(t)) {
643 UseClusters(&t);
73042f01 644 continue;
645 }
b9de75e1 646 delete fSeeds->RemoveAt(i);
73042f01 647 }
b9de75e1 648 UnloadOuterSectors();
73042f01 649
650 //tracking in inner sectors
b9de75e1 651 LoadInnerSectors();
73042f01 652 Int_t found=0;
653 for (i=0; i<nseed; i++) {
b9de75e1 654 AliTPCseed *pt=(AliTPCseed*)fSeeds->UncheckedAt(i), &t=*pt;
73042f01 655 if (!pt) continue;
656 Int_t nc=t.GetNumberOfClusters();
657
b9de75e1 658 Double_t alpha=t.GetAlpha() - fInnerSec->GetAlphaShift();
73042f01 659 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
660 if (alpha < 0. ) alpha += 2.*TMath::Pi();
b9de75e1 661 Int_t ns=Int_t(alpha/fInnerSec->GetAlpha())%fkNIS;
73042f01 662
b9de75e1 663 alpha=ns*fInnerSec->GetAlpha() + fInnerSec->GetAlphaShift() - t.GetAlpha();
73042f01 664
665 if (t.Rotate(alpha)) {
b9de75e1 666 if (FollowProlongation(t)) {
73042f01 667 if (t.GetNumberOfClusters() >= Int_t(0.4*nrows)) {
668 t.CookdEdx();
73042f01 669 iotrack=pt;
670 tracktree.Fill();
b9de75e1 671 UseClusters(&t,nc);
672 cerr<<found++<<'\r';
73042f01 673 }
674 }
675 }
b9de75e1 676 delete fSeeds->RemoveAt(i);
73042f01 677 }
b9de75e1 678 UnloadInnerSectors();
679
afc42102 680 char tname[100];
681 if (fEventN==-1) {
682 sprintf(tname,"TreeT_TPC");
683 }
684 else {
685 sprintf(tname,"TreeT_TPC_%d",fEventN);
686 }
687
688
689 tracktree.Write(tname);
73042f01 690
b9de75e1 691 cerr<<"Number of found tracks : "<<found<<endl;
692
693 savedir->cd();
694
695 return 0;
696}
697
698//_____________________________________________________________________________
699Int_t AliTPCtracker::PropagateBack(const TFile *inp, TFile *out) {
700 //-----------------------------------------------------------------
701 // This function propagates tracks back through the TPC.
702 //-----------------------------------------------------------------
703 fSeeds=new TObjArray(15000);
704
705 TFile *in=(TFile*)inp;
706 TDirectory *savedir=gDirectory;
707
708 if (!in->IsOpen()) {
709 cerr<<"AliTPCtracker::PropagateBack(): ";
710 cerr<<"file with back propagated ITS tracks is not open !\n";
711 return 1;
73042f01 712 }
713
b9de75e1 714 if (!out->IsOpen()) {
715 cerr<<"AliTPCtracker::PropagateBack(): ";
716 cerr<<"file for back propagated TPC tracks is not open !\n";
717 return 2;
718 }
719
720 in->cd();
f38c8ae5 721 TTree *bckTree=(TTree*)in->Get("TreeT_ITSb_0");
b9de75e1 722 if (!bckTree) {
723 cerr<<"AliTPCtracker::PropagateBack() ";
724 cerr<<"can't get a tree with back propagated ITS tracks !\n";
725 return 3;
726 }
727 AliTPCtrack *bckTrack=new AliTPCtrack;
728 bckTree->SetBranchAddress("tracks",&bckTrack);
729
f38c8ae5 730 TTree *tpcTree=(TTree*)in->Get("TreeT_TPC_0");
b9de75e1 731 if (!tpcTree) {
732 cerr<<"AliTPCtracker::PropagateBack() ";
733 cerr<<"can't get a tree with TPC tracks !\n";
734 return 4;
735 }
736 AliTPCtrack *tpcTrack=new AliTPCtrack;
737 tpcTree->SetBranchAddress("tracks",&tpcTrack);
738
739//*** Prepare an array of tracks to be back propagated
740 Int_t nup=fOuterSec->GetNRows(), nlow=fInnerSec->GetNRows();
741 Int_t nrows=nlow+nup;
742
743 TObjArray tracks(15000);
744 Int_t i=0,j=0;
745 Int_t tpcN=(Int_t)tpcTree->GetEntries();
746 Int_t bckN=(Int_t)bckTree->GetEntries();
747 if (j<bckN) bckTree->GetEvent(j++);
748 for (i=0; i<tpcN; i++) {
749 tpcTree->GetEvent(i);
750 Double_t alpha=tpcTrack->GetAlpha();
751 if (j<bckN &&
752 TMath::Abs(tpcTrack->GetLabel())==TMath::Abs(bckTrack->GetLabel())) {
753 if (!bckTrack->Rotate(alpha-bckTrack->GetAlpha())) continue;
754 fSeeds->AddLast(new AliTPCseed(*bckTrack,bckTrack->GetAlpha()));
755 bckTree->GetEvent(j++);
756 } else {
757 tpcTrack->ResetCovariance();
758 fSeeds->AddLast(new AliTPCseed(*tpcTrack,alpha));
759 }
760 tracks.AddLast(new AliTPCtrack(*tpcTrack));
761 }
762
763 out->cd();
f38c8ae5 764 TTree backTree("TreeT_TPCb_0","Tree with back propagated TPC tracks");
b9de75e1 765 AliTPCtrack *otrack=0;
766 backTree.Branch("tracks","AliTPCtrack",&otrack,32000,0);
767
768//*** Back propagation through inner sectors
769 LoadInnerSectors();
770 Int_t nseed=fSeeds->GetEntriesFast();
771 for (i=0; i<nseed; i++) {
772 AliTPCseed *ps=(AliTPCseed*)fSeeds->UncheckedAt(i), &s=*ps;
773 const AliTPCtrack *pt=(AliTPCtrack*)tracks.UncheckedAt(i), &t=*pt;
73042f01 774
b9de75e1 775 Int_t nc=t.GetNumberOfClusters();
776 s.SetLabel(nc-1); //set number of the cluster to start with
73042f01 777
b9de75e1 778 if (FollowBackProlongation(s,t)) {
779 UseClusters(&s);
780 continue;
781 }
782 delete fSeeds->RemoveAt(i);
783 }
784 UnloadInnerSectors();
785
786//*** Back propagation through outer sectors
787 LoadOuterSectors();
788 Int_t found=0;
789 for (i=0; i<nseed; i++) {
790 AliTPCseed *ps=(AliTPCseed*)fSeeds->UncheckedAt(i), &s=*ps;
791 if (!ps) continue;
792 Int_t nc=s.GetNumberOfClusters();
793 const AliTPCtrack *pt=(AliTPCtrack*)tracks.UncheckedAt(i), &t=*pt;
794
795 Double_t alpha=s.GetAlpha() - fSectors->GetAlphaShift();
796 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
797 if (alpha < 0. ) alpha += 2.*TMath::Pi();
798 Int_t ns=Int_t(alpha/fSectors->GetAlpha())%fN;
799
800 alpha =ns*fSectors->GetAlpha() + fSectors->GetAlphaShift();
801 alpha-=s.GetAlpha();
802
803 if (s.Rotate(alpha)) {
804 if (FollowBackProlongation(s,t)) {
805 if (s.GetNumberOfClusters() >= Int_t(0.4*nrows)) {
806 s.CookdEdx();
807 s.SetLabel(t.GetLabel());
808 UseClusters(&s,nc);
809 otrack=ps;
810 backTree.Fill();
811 cerr<<found++<<'\r';
812 continue;
813 }
814 }
815 }
816 delete fSeeds->RemoveAt(i);
817 }
818 UnloadOuterSectors();
819
820 backTree.Write();
73042f01 821 savedir->cd();
b9de75e1 822 cerr<<"Number of seeds: "<<nseed<<endl;
823 cerr<<"Number of back propagated ITS tracks: "<<bckN<<endl;
824 cerr<<"Number of back propagated TPC tracks: "<<found<<endl;
825
826 delete bckTrack;
827 delete tpcTrack;
be5b9287 828
f38c8ae5 829 delete bckTree; //Thanks to Mariana Bondila
830 delete tpcTree; //Thanks to Mariana Bondila
831
be5b9287 832 return 0;
73042f01 833}
834
b9de75e1 835//_________________________________________________________________________
836AliCluster *AliTPCtracker::GetCluster(Int_t index) const {
837 //--------------------------------------------------------------------
838 // Return pointer to a given cluster
839 //--------------------------------------------------------------------
840 Int_t sec=(index&0xff000000)>>24;
841 Int_t row=(index&0x00ff0000)>>16;
842 Int_t ncl=(index&0x0000ffff)>>00;
843
9e1a0ddb 844 AliTPCClustersRow *clrow=((AliTPCtracker *) this)->fClustersArray.GetRow(sec,row);
b9de75e1 845 return (AliCluster*)(*clrow)[ncl];
846}
847
848//__________________________________________________________________________
849void AliTPCtracker::CookLabel(AliKalmanTrack *t, Float_t wrong) const {
850 //--------------------------------------------------------------------
851 //This function "cooks" a track label. If label<0, this track is fake.
852 //--------------------------------------------------------------------
853 Int_t noc=t->GetNumberOfClusters();
854 Int_t *lb=new Int_t[noc];
855 Int_t *mx=new Int_t[noc];
856 AliCluster **clusters=new AliCluster*[noc];
857
858 Int_t i;
859 for (i=0; i<noc; i++) {
860 lb[i]=mx[i]=0;
861 Int_t index=t->GetClusterIndex(i);
862 clusters[i]=GetCluster(index);
863 }
864
865 Int_t lab=123456789;
866 for (i=0; i<noc; i++) {
867 AliCluster *c=clusters[i];
868 lab=TMath::Abs(c->GetLabel(0));
869 Int_t j;
870 for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break;
871 lb[j]=lab;
872 (mx[j])++;
873 }
874
875 Int_t max=0;
876 for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];}
877
878 for (i=0; i<noc; i++) {
879 AliCluster *c=clusters[i];
880 if (TMath::Abs(c->GetLabel(1)) == lab ||
881 TMath::Abs(c->GetLabel(2)) == lab ) max++;
882 }
883
884 if ((1.- Float_t(max)/noc) > wrong) lab=-lab;
885
886 else {
887 Int_t tail=Int_t(0.10*noc);
888 max=0;
889 for (i=1; i<=tail; i++) {
890 AliCluster *c=clusters[noc-i];
891 if (lab == TMath::Abs(c->GetLabel(0)) ||
892 lab == TMath::Abs(c->GetLabel(1)) ||
893 lab == TMath::Abs(c->GetLabel(2))) max++;
894 }
895 if (max < Int_t(0.5*tail)) lab=-lab;
896 }
897
898 t->SetLabel(lab);
899
900 delete[] lb;
901 delete[] mx;
902 delete[] clusters;
903}
904
905//_________________________________________________________________________
906void AliTPCtracker::AliTPCSector::Setup(const AliTPCParam *par, Int_t f) {
907 //-----------------------------------------------------------------------
908 // Setup inner sector
909 //-----------------------------------------------------------------------
910 if (f==0) {
911 fAlpha=par->GetInnerAngle();
912 fAlphaShift=par->GetInnerAngleShift();
913 fPadPitchWidth=par->GetInnerPadPitchWidth();
914 fPadPitchLength=par->GetInnerPadPitchLength();
915
916 fN=par->GetNRowLow();
917 fRow=new AliTPCRow[fN];
918 for (Int_t i=0; i<fN; i++) fRow[i].SetX(par->GetPadRowRadiiLow(i));
919 } else {
920 fAlpha=par->GetOuterAngle();
921 fAlphaShift=par->GetOuterAngleShift();
922 fPadPitchWidth=par->GetOuterPadPitchWidth();
923 fPadPitchLength=par->GetOuterPadPitchLength();
924
925 fN=par->GetNRowUp();
926 fRow=new AliTPCRow[fN];
927 for (Int_t i=0; i<fN; i++) fRow[i].SetX(par->GetPadRowRadiiUp(i));
928 }
929}
930
73042f01 931//_________________________________________________________________________
932void
933AliTPCtracker::AliTPCRow::InsertCluster(const AliTPCcluster* c, UInt_t index) {
934 //-----------------------------------------------------------------------
935 // Insert a cluster into this pad row in accordence with its y-coordinate
936 //-----------------------------------------------------------------------
b9de75e1 937 if (fN==kMaxClusterPerRow) {
73042f01 938 cerr<<"AliTPCRow::InsertCluster(): Too many clusters !\n"; return;
939 }
940 if (fN==0) {fIndex[0]=index; fClusters[fN++]=c; return;}
941 Int_t i=Find(c->GetY());
942 memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliTPCcluster*));
943 memmove(fIndex +i+1 ,fIndex +i,(fN-i)*sizeof(UInt_t));
944 fIndex[i]=index; fClusters[i]=c; fN++;
945}
946
947//___________________________________________________________________
948Int_t AliTPCtracker::AliTPCRow::Find(Double_t y) const {
949 //-----------------------------------------------------------------------
950 // Return the index of the nearest cluster
951 //-----------------------------------------------------------------------
952 if (y <= fClusters[0]->GetY()) return 0;
953 if (y > fClusters[fN-1]->GetY()) return fN;
954 Int_t b=0, e=fN-1, m=(b+e)/2;
955 for (; b<e; m=(b+e)/2) {
956 if (y > fClusters[m]->GetY()) b=m+1;
957 else e=m;
958 }
959 return m;
960}
961
962//_____________________________________________________________________________
963void AliTPCtracker::AliTPCseed::CookdEdx(Double_t low, Double_t up) {
964 //-----------------------------------------------------------------
965 // This funtion calculates dE/dX within the "low" and "up" cuts.
966 //-----------------------------------------------------------------
967 Int_t i;
be9c5115 968 Int_t nc=GetNumberOfClusters();
73042f01 969
970 Int_t swap;//stupid sorting
971 do {
972 swap=0;
be9c5115 973 for (i=0; i<nc-1; i++) {
d4cf1daa 974 if (fdEdxSample[i]<=fdEdxSample[i+1]) continue;
975 Float_t tmp=fdEdxSample[i];
976 fdEdxSample[i]=fdEdxSample[i+1]; fdEdxSample[i+1]=tmp;
73042f01 977 swap++;
978 }
979 } while (swap);
980
be9c5115 981 Int_t nl=Int_t(low*nc), nu=Int_t(up*nc);
73042f01 982 Float_t dedx=0;
d4cf1daa 983 for (i=nl; i<=nu; i++) dedx += fdEdxSample[i];
73042f01 984 dedx /= (nu-nl+1);
985 SetdEdx(dedx);
986}
987
73042f01 988
989