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[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
0fa7dfa7 16/* $Id$ */
73042f01 17
18//-------------------------------------------------------
19// Implementation of the TPC tracker
20//
21// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
22//-------------------------------------------------------
73042f01 23#include <TObjArray.h>
c630aafd 24#include <TError.h>
73042f01 25#include <TFile.h>
be5b9287 26#include <TTree.h>
c630aafd 27
af885e0f 28#include "AliESDEvent.h"
aad72f45 29#include "AliESDtrack.h"
be5b9287 30
31#include "AliTPCtracker.h"
32#include "AliTPCcluster.h"
b9de75e1 33#include "AliTPCParam.h"
c630aafd 34#include "AliClusters.h"
35
36ClassImp(AliTPCtracker)
83d73500 37
6c94f330 38//_____________________________________________________________________________
39AliTPCtracker::AliTPCtracker():
40 AliTracker(),
41 fkNIS(0),
42 fInnerSec(0),
43 fkNOS(0),
44 fOuterSec(0),
45 fN(0),
46 fSectors(0),
47 fParam(0),
48 fSeeds(0)
49{
50 //
51 // The default TPC tracker constructor
52 //
53}
54
b9de75e1 55//_____________________________________________________________________________
c630aafd 56AliTPCtracker::AliTPCtracker(const AliTPCParam *par):
6c94f330 57 AliTracker(),
58 fkNIS(par->GetNInnerSector()/2),
59 fInnerSec(new AliTPCSector[fkNIS]),
60 fkNOS(par->GetNOuterSector()/2),
61 fOuterSec(new AliTPCSector[fkNOS]),
62 fN(0),
63 fSectors(0),
64 fParam((AliTPCParam*) par),
65 fSeeds(0)
b9de75e1 66{
67 //---------------------------------------------------------------------
68 // The main TPC tracker constructor
69 //---------------------------------------------------------------------
b9de75e1 70
71 Int_t i;
72 for (i=0; i<fkNIS; i++) fInnerSec[i].Setup(par,0);
73 for (i=0; i<fkNOS; i++) fOuterSec[i].Setup(par,1);
74
b9de75e1 75}
76
77//_____________________________________________________________________________
78AliTPCtracker::~AliTPCtracker() {
79 //------------------------------------------------------------------
80 // TPC tracker destructor
81 //------------------------------------------------------------------
82 delete[] fInnerSec;
83 delete[] fOuterSec;
1c8d9aad 84 if (fSeeds) {
85 fSeeds->Delete();
86 delete fSeeds;
87 }
c630aafd 88}
89
73042f01 90//_____________________________________________________________________________
bdbd0f7a 91Double_t f1(Double_t x1,Double_t y1,
73042f01 92 Double_t x2,Double_t y2,
93 Double_t x3,Double_t y3)
94{
95 //-----------------------------------------------------------------
96 // Initial approximation of the track curvature
97 //-----------------------------------------------------------------
98 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
99 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
100 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
101 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
102 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
103
104 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
105
106 return -xr*yr/sqrt(xr*xr+yr*yr);
107}
108
109
110//_____________________________________________________________________________
bdbd0f7a 111Double_t f2(Double_t x1,Double_t y1,
73042f01 112 Double_t x2,Double_t y2,
113 Double_t x3,Double_t y3)
114{
115 //-----------------------------------------------------------------
116 // Initial approximation of the track curvature times center of curvature
117 //-----------------------------------------------------------------
118 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
119 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
120 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
121 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
122 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
123
124 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
125
126 return -a/(d*y1-b)*xr/sqrt(xr*xr+yr*yr);
127}
128
129//_____________________________________________________________________________
bdbd0f7a 130Double_t f3(Double_t x1,Double_t y1,
73042f01 131 Double_t x2,Double_t y2,
132 Double_t z1,Double_t z2)
133{
134 //-----------------------------------------------------------------
135 // Initial approximation of the tangent of the track dip angle
136 //-----------------------------------------------------------------
137 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
138}
139
83d73500 140//_____________________________________________________________________________
c630aafd 141Int_t AliTPCtracker::LoadClusters(TTree *cTree) {
b9de75e1 142 //-----------------------------------------------------------------
c630aafd 143 // This function loads TPC clusters.
b9de75e1 144 //-----------------------------------------------------------------
c630aafd 145 TBranch *branch=cTree->GetBranch("Segment");
146 if (!branch) {
147 Error("LoadClusters","Can't get the branch !");
148 return 1;
b9de75e1 149 }
150
c630aafd 151 AliClusters carray, *addr=&carray;
152 carray.SetClass("AliTPCcluster");
153 carray.SetArray(0);
154 branch->SetAddress(&addr);
b9de75e1 155
c630aafd 156 Int_t nentr=(Int_t)cTree->GetEntries();
83d73500 157
c630aafd 158 for (Int_t i=0; i<nentr; i++) {
159 cTree->GetEvent(i);
bcc04e2a 160
c630aafd 161 Int_t ncl=carray.GetArray()->GetEntriesFast();
162
163 Int_t nir=fInnerSec->GetNRows(), nor=fOuterSec->GetNRows();
164 Int_t id=carray.GetID();
165 if ((id<0) || (id>2*(fkNIS*nir + fkNOS*nor))) {
df02fd67 166 Fatal("LoadClusters","Wrong index !");
bcc04e2a 167 }
c630aafd 168 Int_t outindex = 2*fkNIS*nir;
169 if (id<outindex) {
170 Int_t sec = id/nir;
171 Int_t row = id - sec*nir;
172 sec %= fkNIS;
173 AliTPCRow &padrow=fInnerSec[sec][row];
174 while (ncl--) {
175 AliTPCcluster *c=(AliTPCcluster*)carray[ncl];
176 padrow.InsertCluster(c,sec,row);
177 }
178 } else {
179 id -= outindex;
180 Int_t sec = id/nor;
181 Int_t row = id - sec*nor;
182 sec %= fkNOS;
183 AliTPCRow &padrow=fOuterSec[sec][row];
184 while (ncl--) {
185 AliTPCcluster *c=(AliTPCcluster*)carray[ncl];
186 padrow.InsertCluster(c,sec+fkNIS,row);
187 }
188 }
189 carray.GetArray()->Clear();
bcc04e2a 190 }
88cb7938 191
c630aafd 192 return 0;
b9de75e1 193}
194
195//_____________________________________________________________________________
c630aafd 196void AliTPCtracker::UnloadClusters() {
b9de75e1 197 //-----------------------------------------------------------------
c630aafd 198 // This function unloads TPC clusters.
b9de75e1 199 //-----------------------------------------------------------------
c630aafd 200 Int_t i;
201 for (i=0; i<fkNIS; i++) {
202 Int_t nr=fInnerSec->GetNRows();
203 for (Int_t n=0; n<nr; n++) fInnerSec[i][n].ResetClusters();
204 }
205 for (i=0; i<fkNOS; i++) {
206 Int_t nr=fOuterSec->GetNRows();
207 for (Int_t n=0; n<nr; n++) fOuterSec[i][n].ResetClusters();
b9de75e1 208 }
b9de75e1 209}
210
211//_____________________________________________________________________________
212Int_t AliTPCtracker::FollowProlongation(AliTPCseed& t, Int_t rf) {
73042f01 213 //-----------------------------------------------------------------
214 // This function tries to find a track prolongation.
215 //-----------------------------------------------------------------
b9de75e1 216 Double_t xt=t.GetX();
217 const Int_t kSKIP=(t.GetNumberOfClusters()<10) ? kRowsToSkip :
218 Int_t(0.5*fSectors->GetNRows());
73042f01 219 Int_t tryAgain=kSKIP;
73042f01 220
b9de75e1 221 Double_t alpha=t.GetAlpha() - fSectors->GetAlphaShift();
222 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
223 if (alpha < 0. ) alpha += 2.*TMath::Pi();
224 Int_t s=Int_t(alpha/fSectors->GetAlpha())%fN;
225
f03e3423 226 Int_t nrows=fSectors->GetRowNumber(xt)-1;
227 for (Int_t nr=nrows; nr>=rf; nr--) {
b9de75e1 228 Double_t x=fSectors->GetX(nr), ymax=fSectors->GetMaxY(nr);
73042f01 229 if (!t.PropagateTo(x)) return 0;
230
231 AliTPCcluster *cl=0;
232 UInt_t index=0;
b9de75e1 233 Double_t maxchi2=kMaxCHI2;
234 const AliTPCRow &krow=fSectors[s][nr];
6c23ffed 235 Double_t pt=t.GetSignedPt();
6d75e4b6 236 Double_t sy2=AliTPCcluster::SigmaY2(t.GetX(),t.GetTgl(),pt);
237 Double_t sz2=AliTPCcluster::SigmaZ2(t.GetX(),t.GetTgl());
73042f01 238 Double_t road=4.*sqrt(t.GetSigmaY2() + sy2), y=t.GetY(), z=t.GetZ();
239
b9de75e1 240 if (road>kMaxROAD) {
73042f01 241 if (t.GetNumberOfClusters()>4)
c630aafd 242 Warning("FindProlongation","Too broad road !");
73042f01 243 return 0;
244 }
245
246 if (krow) {
247 for (Int_t i=krow.Find(y-road); i<krow; i++) {
c630aafd 248 AliTPCcluster *c=(AliTPCcluster*)(krow[i]);
249 if (c->GetY() > y+road) break;
250 if (c->IsUsed()) continue;
251 if ((c->GetZ()-z)*(c->GetZ()-z) > 16.*(t.GetSigmaZ2()+sz2)) continue;
252 Double_t chi2=t.GetPredictedChi2(c);
253 if (chi2 > maxchi2) continue;
254 maxchi2=chi2;
255 cl=c;
73042f01 256 index=krow.GetIndex(i);
257 }
258 }
259 if (cl) {
b9de75e1 260 Float_t l=fSectors->GetPadPitchWidth();
024a7fe9 261 Float_t corr=1.; if (nr>63) corr=0.67; // new (third) pad response !
262 t.SetSampledEdx(cl->GetQ()/l*corr,t.GetNumberOfClusters());
be9c5115 263 if (!t.Update(cl,maxchi2,index)) {
264 if (!tryAgain--) return 0;
265 } else tryAgain=kSKIP;
73042f01 266 } else {
267 if (tryAgain==0) break;
268 if (y > ymax) {
b9de75e1 269 s = (s+1) % fN;
270 if (!t.Rotate(fSectors->GetAlpha())) return 0;
73042f01 271 } else if (y <-ymax) {
b9de75e1 272 s = (s-1+fN) % fN;
273 if (!t.Rotate(-fSectors->GetAlpha())) return 0;
73042f01 274 }
275 tryAgain--;
276 }
277 }
278
279 return 1;
b9de75e1 280}
c630aafd 281//_____________________________________________________________________________
282
283Int_t AliTPCtracker::FollowRefitInward(AliTPCseed *seed, AliTPCtrack *track) {
284 //
285 // This function propagates seed inward TPC using old clusters
286 // from the track.
287 //
288 // Sylwester Radomski, GSI
289 // 26.02.2003
290 //
291
292 // loop over rows
293
294 Int_t nRows = fSectors->GetNRows();
0fa7dfa7 295 for (Int_t iRow = nRows-1; iRow >= 0; iRow--) {
c630aafd 296
297 Double_t x = fSectors->GetX(iRow);
298 if (!seed->PropagateTo(x)) return 0;
299
300 // try to find an assigned cluster in this row
301
302 AliTPCcluster* cluster = NULL;
303 Int_t idx = -1;
304 Int_t sec = -1;
305 for (Int_t iCluster = 0; iCluster < track->GetNumberOfClusters(); iCluster++) {
306 idx = track->GetClusterIndex(iCluster);
307 sec = (idx&0xff000000)>>24;
308 Int_t row = (idx&0x00ff0000)>>16;
309 if (((fSectors == fInnerSec) && (sec >= fkNIS)) ||
310 ((fSectors == fOuterSec) && (sec < fkNIS))) continue;
311 if (row == iRow) {
312 cluster = (AliTPCcluster*) GetCluster(idx);
313 break;
314 }
315 }
316
317 // update the track seed with the found cluster
318
319 if (cluster) {
320 Double_t dAlpha = fParam->GetAngle(sec) - seed->GetAlpha();
321 if (TMath::Abs(dAlpha) > 0.0001) {
322 if (!seed->Rotate(dAlpha)) return 0;
323 if (!seed->PropagateTo(x)) return 0;
324 }
325
326 seed->Update(cluster, seed->GetPredictedChi2(cluster), idx);
327 }
328 }
329
330 return 1;
331}
b9de75e1 332
333//_____________________________________________________________________________
334Int_t AliTPCtracker::FollowBackProlongation
335(AliTPCseed& seed, const AliTPCtrack &track) {
336 //-----------------------------------------------------------------
337 // This function propagates tracks back through the TPC
338 //-----------------------------------------------------------------
339 Double_t alpha=seed.GetAlpha() - fSectors->GetAlphaShift();
340 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
341 if (alpha < 0. ) alpha += 2.*TMath::Pi();
342 Int_t s=Int_t(alpha/fSectors->GetAlpha())%fN;
343
344 Int_t idx=-1, sec=-1, row=-1;
6c94f330 345 Int_t nc=track.GetNumberOfClusters();
c630aafd 346
b9de75e1 347 if (nc--) {
348 idx=track.GetClusterIndex(nc);
349 sec=(idx&0xff000000)>>24; row=(idx&0x00ff0000)>>16;
350 }
c630aafd 351 if (fSectors==fInnerSec) { if (sec >= fkNIS) row=-1; }
352 else { if (sec < fkNIS) row=-1; }
b9de75e1 353
354 Int_t nr=fSectors->GetNRows();
355 for (Int_t i=0; i<nr; i++) {
356 Double_t x=fSectors->GetX(i), ymax=fSectors->GetMaxY(i);
6c94f330 357 Double_t y;
358 if (!seed.GetYAt(x,GetBz(),y)) return 0;
c630aafd 359
b9de75e1 360 if (y > ymax) {
361 s = (s+1) % fN;
362 if (!seed.Rotate(fSectors->GetAlpha())) return 0;
363 } else if (y <-ymax) {
364 s = (s-1+fN) % fN;
365 if (!seed.Rotate(-fSectors->GetAlpha())) return 0;
366 }
367
c630aafd 368 if (!seed.PropagateTo(x)) return 0;
369
b9de75e1 370 AliTPCcluster *cl=0;
371 Int_t index=0;
372 Double_t maxchi2=kMaxCHI2;
6c23ffed 373 Double_t pt=seed.GetSignedPt();
6d75e4b6 374 Double_t sy2=AliTPCcluster::SigmaY2(seed.GetX(),seed.GetTgl(),pt);
375 Double_t sz2=AliTPCcluster::SigmaZ2(seed.GetX(),seed.GetTgl());
b9de75e1 376 Double_t road=4.*sqrt(seed.GetSigmaY2() + sy2), z=seed.GetZ();
377 if (road>kMaxROAD) {
c630aafd 378 Warning("FollowBackProlongation","Too broad road !");
b9de75e1 379 return 0;
380 }
381
b9de75e1 382 Int_t accepted=seed.GetNumberOfClusters();
383 if (row==i) {
384 //try to accept already found cluster
385 AliTPCcluster *c=(AliTPCcluster*)GetCluster(idx);
386 Double_t chi2;
387 if ((chi2=seed.GetPredictedChi2(c))<maxchi2 || accepted<27) {
388 index=idx; cl=c; maxchi2=chi2;
389 } //else cerr<<"AliTPCtracker::FollowBackProlongation: oulier !\n";
390
391 if (nc--) {
392 idx=track.GetClusterIndex(nc);
393 sec=(idx&0xff000000)>>24; row=(idx&0x00ff0000)>>16;
394 }
c630aafd 395 if (fSectors==fInnerSec) { if (sec >= fkNIS) row=-1; }
396 else { if (sec < fkNIS) row=-1; }
73042f01 397
b9de75e1 398 }
399 if (!cl) {
400 //try to fill the gap
401 const AliTPCRow &krow=fSectors[s][i];
402 if (accepted>27)
403 if (krow) {
404 for (Int_t i=krow.Find(y-road); i<krow; i++) {
c630aafd 405 AliTPCcluster *c=(AliTPCcluster*)(krow[i]);
406 if (c->GetY() > y+road) break;
407 if (c->IsUsed()) continue;
408 if ((c->GetZ()-z)*(c->GetZ()-z)>16.*(seed.GetSigmaZ2()+sz2)) continue;
409 Double_t chi2=seed.GetPredictedChi2(c);
410 if (chi2 > maxchi2) continue;
411 maxchi2=chi2;
412 cl=c;
b9de75e1 413 index=krow.GetIndex(i);
414 }
415 }
416 }
417
418 if (cl) {
419 Float_t l=fSectors->GetPadPitchWidth();
024a7fe9 420 Float_t corr=1.; if (i>63) corr=0.67; // new (third) pad response !
421 seed.SetSampledEdx(cl->GetQ()/l*corr,seed.GetNumberOfClusters());
b9de75e1 422 seed.Update(cl,maxchi2,index);
423 }
424
425 }
426
b9de75e1 427 return 1;
73042f01 428}
429
430//_____________________________________________________________________________
b9de75e1 431void AliTPCtracker::MakeSeeds(Int_t i1, Int_t i2) {
73042f01 432 //-----------------------------------------------------------------
433 // This function creates track seeds.
434 //-----------------------------------------------------------------
435 Double_t x[5], c[15];
436
c630aafd 437 Double_t alpha=fSectors->GetAlpha(), shift=fSectors->GetAlphaShift();
73042f01 438 Double_t cs=cos(alpha), sn=sin(alpha);
439
c630aafd 440 Double_t x1 =fSectors->GetX(i1);
441 Double_t xx2=fSectors->GetX(i2);
73042f01 442
c630aafd 443 for (Int_t ns=0; ns<fN; ns++) {
444 Int_t nl=fSectors[(ns-1+fN)%fN][i2];
445 Int_t nm=fSectors[ns][i2];
446 Int_t nu=fSectors[(ns+1)%fN][i2];
447 const AliTPCRow& kr1=fSectors[ns][i1];
73042f01 448 for (Int_t is=0; is < kr1; is++) {
449 Double_t y1=kr1[is]->GetY(), z1=kr1[is]->GetZ();
450 for (Int_t js=0; js < nl+nm+nu; js++) {
c630aafd 451 const AliTPCcluster *kcl;
73042f01 452 Double_t x2, y2, z2;
7f6ddf58 453 Double_t x3=GetX(), y3=GetY(), z3=GetZ();
73042f01 454
c630aafd 455 if (js<nl) {
456 const AliTPCRow& kr2=fSectors[(ns-1+fN)%fN][i2];
457 kcl=kr2[js];
73042f01 458 y2=kcl->GetY(); z2=kcl->GetZ();
459 x2= xx2*cs+y2*sn;
460 y2=-xx2*sn+y2*cs;
c630aafd 461 } else
462 if (js<nl+nm) {
463 const AliTPCRow& kr2=fSectors[ns][i2];
464 kcl=kr2[js-nl];
73042f01 465 x2=xx2; y2=kcl->GetY(); z2=kcl->GetZ();
c630aafd 466 } else {
467 const AliTPCRow& kr2=fSectors[(ns+1)%fN][i2];
468 kcl=kr2[js-nl-nm];
73042f01 469 y2=kcl->GetY(); z2=kcl->GetZ();
470 x2=xx2*cs-y2*sn;
471 y2=xx2*sn+y2*cs;
c630aafd 472 }
73042f01 473
7f6ddf58 474 Double_t zz=z1 - (z1-z3)/(x1-x3)*(x1-x2);
73042f01 475 if (TMath::Abs(zz-z2)>5.) continue;
476
477 Double_t d=(x2-x1)*(0.-y2)-(0.-x2)*(y2-y1);
c630aafd 478 if (d==0.) {
479 Warning("MakeSeeds","Straight seed !");
480 continue;
481 }
482 x[0]=y1;
483 x[1]=z1;
484 x[4]=f1(x1,y1,x2,y2,x3,y3);
485 if (TMath::Abs(x[4]) >= 0.0066) continue;
486 x[2]=f2(x1,y1,x2,y2,x3,y3);
487 //if (TMath::Abs(x[4]*x1-x[2]) >= 0.99999) continue;
488 x[3]=f3(x1,y1,x2,y2,z1,z2);
489 if (TMath::Abs(x[3]) > 1.2) continue;
490 Double_t a=asin(x[2]);
491 Double_t zv=z1 - x[3]/x[4]*(a+asin(x[4]*x1-x[2]));
492 if (TMath::Abs(zv-z3)>10.) continue;
73042f01 493
494 Double_t sy1=kr1[is]->GetSigmaY2(), sz1=kr1[is]->GetSigmaZ2();
495 Double_t sy2=kcl->GetSigmaY2(), sz2=kcl->GetSigmaZ2();
024a7fe9 496 //Double_t sy3=400*3./12., sy=0.1, sz=0.1;
497 Double_t sy3=25000*x[4]*x[4]+0.1, sy=0.1, sz=0.1;
73042f01 498
c630aafd 499 Double_t f40=(f1(x1,y1+sy,x2,y2,x3,y3)-x[4])/sy;
500 Double_t f42=(f1(x1,y1,x2,y2+sy,x3,y3)-x[4])/sy;
501 Double_t f43=(f1(x1,y1,x2,y2,x3,y3+sy)-x[4])/sy;
502 Double_t f20=(f2(x1,y1+sy,x2,y2,x3,y3)-x[2])/sy;
503 Double_t f22=(f2(x1,y1,x2,y2+sy,x3,y3)-x[2])/sy;
504 Double_t f23=(f2(x1,y1,x2,y2,x3,y3+sy)-x[2])/sy;
505 Double_t f30=(f3(x1,y1+sy,x2,y2,z1,z2)-x[3])/sy;
506 Double_t f31=(f3(x1,y1,x2,y2,z1+sz,z2)-x[3])/sz;
507 Double_t f32=(f3(x1,y1,x2,y2+sy,z1,z2)-x[3])/sy;
508 Double_t f34=(f3(x1,y1,x2,y2,z1,z2+sz)-x[3])/sz;
73042f01 509
510 c[0]=sy1;
511 c[1]=0.; c[2]=sz1;
b9de75e1 512 c[3]=f20*sy1; c[4]=0.; c[5]=f20*sy1*f20+f22*sy2*f22+f23*sy3*f23;
513 c[6]=f30*sy1; c[7]=f31*sz1; c[8]=f30*sy1*f20+f32*sy2*f22;
514 c[9]=f30*sy1*f30+f31*sz1*f31+f32*sy2*f32+f34*sz2*f34;
515 c[10]=f40*sy1; c[11]=0.; c[12]=f40*sy1*f20+f42*sy2*f22+f43*sy3*f23;
516 c[13]=f30*sy1*f40+f32*sy2*f42;
517 c[14]=f40*sy1*f40+f42*sy2*f42+f43*sy3*f43;
73042f01 518
6c94f330 519 Int_t index=kr1.GetIndex(is);
520 AliTPCseed *track=new AliTPCseed(x1, ns*alpha+shift, x, c, index);
c630aafd 521 Float_t l=fSectors->GetPadPitchWidth();
73042f01 522 track->SetSampledEdx(kr1[is]->GetQ()/l,0);
523
b9de75e1 524 Int_t rc=FollowProlongation(*track, i2);
be9c5115 525 if (rc==0 || track->GetNumberOfClusters()<(i1-i2)/2) delete track;
c630aafd 526 else fSeeds->AddLast(track);
73042f01 527 }
528 }
529 }
530}
531
532//_____________________________________________________________________________
b9de75e1 533Int_t AliTPCtracker::ReadSeeds(const TFile *inp) {
73042f01 534 //-----------------------------------------------------------------
b9de75e1 535 // This function reades track seeds.
73042f01 536 //-----------------------------------------------------------------
537 TDirectory *savedir=gDirectory;
538
b9de75e1 539 TFile *in=(TFile*)inp;
540 if (!in->IsOpen()) {
c630aafd 541 Error("ReadSeeds","Input file has not been open !");
be5b9287 542 return 1;
73042f01 543 }
544
b9de75e1 545 in->cd();
546 TTree *seedTree=(TTree*)in->Get("Seeds");
547 if (!seedTree) {
c630aafd 548 Error("ReadSeeds","Can't get a tree with track seeds !");
b9de75e1 549 return 2;
550 }
551 AliTPCtrack *seed=new AliTPCtrack;
552 seedTree->SetBranchAddress("tracks",&seed);
553
554 if (fSeeds==0) fSeeds=new TObjArray(15000);
73042f01 555
b9de75e1 556 Int_t n=(Int_t)seedTree->GetEntries();
557 for (Int_t i=0; i<n; i++) {
558 seedTree->GetEvent(i);
a91e73bc 559 seed->ResetClusters();
bbc6cd2c 560 fSeeds->AddLast(new AliTPCseed(*seed));
b9de75e1 561 }
562
563 delete seed;
f38c8ae5 564
565 delete seedTree; //Thanks to Mariana Bondila
566
b9de75e1 567 savedir->cd();
73042f01 568
b9de75e1 569 return 0;
570}
73042f01 571
cab3f0a3 572//_____________________________________________________________________________
af885e0f 573Int_t AliTPCtracker::Clusters2Tracks(AliESDEvent *event) {
b9de75e1 574 //-----------------------------------------------------------------
575 // This is a track finder.
c630aafd 576 // The clusters must be already loaded !
b9de75e1 577 //-----------------------------------------------------------------
b9de75e1 578
73042f01 579 //find track seeds
b9de75e1 580 Int_t nup=fOuterSec->GetNRows(), nlow=fInnerSec->GetNRows();
73042f01 581 Int_t nrows=nlow+nup;
b9de75e1 582 if (fSeeds==0) {
583 Int_t gap=Int_t(0.125*nrows), shift=Int_t(0.5*gap);
c630aafd 584 fSectors=fOuterSec; fN=fkNOS;
585 fSeeds=new TObjArray(15000);
b9de75e1 586 MakeSeeds(nup-1, nup-1-gap);
587 MakeSeeds(nup-1-shift, nup-1-shift-gap);
c630aafd 588 }
b9de75e1 589 fSeeds->Sort();
73042f01 590
b9de75e1 591 Int_t nseed=fSeeds->GetEntriesFast();
c630aafd 592 for (Int_t i=0; i<nseed; i++) {
593 //tracking in the outer sectors
594 fSectors=fOuterSec; fN=fkNOS;
595
b9de75e1 596 AliTPCseed *pt=(AliTPCseed*)fSeeds->UncheckedAt(i), &t=*pt;
c630aafd 597 if (!FollowProlongation(t)) {
598 delete fSeeds->RemoveAt(i);
73042f01 599 continue;
600 }
c630aafd 601
602 //tracking in the inner sectors
603 fSectors=fInnerSec; fN=fkNIS;
604
605 Double_t alpha=t.GetAlpha() - fInnerSec->GetAlphaShift();
606 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
607 if (alpha < 0. ) alpha += 2.*TMath::Pi();
608 Int_t ns=Int_t(alpha/fInnerSec->GetAlpha())%fkNIS;
609
610 alpha=ns*fInnerSec->GetAlpha()+fInnerSec->GetAlphaShift()-t.GetAlpha();
611
612 if (t.Rotate(alpha)) {
613 if (FollowProlongation(t)) {
614 if (t.GetNumberOfClusters() >= Int_t(0.4*nrows)) {
615 t.CookdEdx();
616 CookLabel(pt,0.1); //For comparison only
617 pt->PropagateTo(fParam->GetInnerRadiusLow());
618 AliESDtrack iotrack;
619 iotrack.UpdateTrackParams(pt,AliESDtrack::kTPCin);
620
621 event->AddTrack(&iotrack);
622
623 UseClusters(&t);
624 }
625 }
626 }
88cb7938 627 delete fSeeds->RemoveAt(i);
c630aafd 628 }
629
630 Info("Clusters2Tracks","Number of found tracks : %d",
631 event->GetNumberOfTracks());
632
633 fSeeds->Clear(); delete fSeeds; fSeeds=0;
634
635 return 0;
636}
637
c630aafd 638//_____________________________________________________________________________
af885e0f 639Int_t AliTPCtracker::RefitInward(AliESDEvent* event) {
c630aafd 640 //
641 // The function propagates tracks throught TPC inward
642 // using already associated clusters.
643 // The clusters must be already loaded !
644 //
645
646 Int_t nTracks = event->GetNumberOfTracks();
647 Int_t nRefited = 0;
648
649 for (Int_t i = 0; i < nTracks; i++) {
650 AliESDtrack* track = event->GetTrack(i);
651 ULong_t status = track->GetStatus();
652
4ec88b9c 653 if ( (status & AliESDtrack::kTPCrefit) != 0 ) continue;
c630aafd 654 if ( (status & AliESDtrack::kTPCout ) == 0 ) continue;
4ec88b9c 655
656 if ( (status & AliESDtrack::kTRDout ) != 0 )
657 if ( (status & AliESDtrack::kTRDrefit ) == 0 ) continue;
658
c630aafd 659 AliTPCtrack* tpcTrack = new AliTPCtrack(*track);
a91e73bc 660 AliTPCseed* seed=new AliTPCseed(*tpcTrack); seed->ResetClusters();
08dba16b 661
6c94f330 662 if ( (status & AliESDtrack::kTRDrefit) == 0 ) seed->ResetCovariance(10.);
4ec88b9c 663
c630aafd 664 fSectors = fOuterSec;
665
666 Int_t res = FollowRefitInward(seed, tpcTrack);
667 UseClusters(seed);
668 Int_t nc = seed->GetNumberOfClusters();
669
670 fSectors = fInnerSec;
671
672 res = FollowRefitInward(seed, tpcTrack);
673 UseClusters(seed, nc);
674
675 if (res) {
676 seed->PropagateTo(fParam->GetInnerRadiusLow());
677 seed->SetLabel(tpcTrack->GetLabel());
678 seed->SetdEdx(tpcTrack->GetdEdx());
679 track->UpdateTrackParams(seed, AliESDtrack::kTPCrefit);
680 nRefited++;
681 }
682
683 delete seed;
684 delete tpcTrack;
685 }
686
687 Info("RefitInward","Number of refitted tracks : %d",nRefited);
688
689 return 0;
690}
691
af885e0f 692Int_t AliTPCtracker::PropagateBack(AliESDEvent *event) {
c630aafd 693 //-----------------------------------------------------------------
694 // This function propagates tracks back through the TPC.
695 // The clusters must be already loaded !
696 //-----------------------------------------------------------------
697 Int_t nentr=event->GetNumberOfTracks();
698 Info("PropagateBack", "Number of ESD tracks: %d\n", nentr);
699
700 Int_t ntrk=0;
701 for (Int_t i=0; i<nentr; i++) {
702 AliESDtrack *esd=event->GetTrack(i);
703 ULong_t status=esd->GetStatus();
704
705 if ( (status & AliESDtrack::kTPCin ) == 0 ) continue;
706 if ( (status & AliESDtrack::kTPCout) != 0 ) continue;
14718359 707 if ( (status & AliESDtrack::kITSin) != 0 )
708 if ( (status & AliESDtrack::kITSout) == 0 ) continue;
c630aafd 709
710 const AliTPCtrack t(*esd);
a91e73bc 711 AliTPCseed s(t); s.ResetClusters();
c630aafd 712
6c94f330 713 if ( (status & AliESDtrack::kITSout) == 0 ) s.ResetCovariance(10.);
c630aafd 714
715 //inner sectors
716 fSectors=fInnerSec; fN=fkNIS;
717
718 Double_t alpha=s.GetAlpha() - fSectors->GetAlphaShift();
719 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
720 if (alpha < 0. ) alpha += 2.*TMath::Pi();
721 Int_t ns=Int_t(alpha/fSectors->GetAlpha())%fN;
722 alpha =ns*fSectors->GetAlpha() + fSectors->GetAlphaShift();
723 alpha-=s.GetAlpha();
724
725 if (!s.Rotate(alpha)) continue;
726 if (!FollowBackProlongation(s,t)) continue;
727
728 UseClusters(&s);
729
730 //outer sectors
731 fSectors=fOuterSec; fN=fkNOS;
732
6c94f330 733 Int_t nc=s.GetNumberOfClusters();
c630aafd 734
735 alpha=s.GetAlpha() - fSectors->GetAlphaShift();
736 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
737 if (alpha < 0. ) alpha += 2.*TMath::Pi();
738 ns=Int_t(alpha/fSectors->GetAlpha())%fN;
739
740 alpha =ns*fSectors->GetAlpha() + fSectors->GetAlphaShift();
741 alpha-=s.GetAlpha();
742
743 if (!s.Rotate(alpha)) continue;
744 if (!FollowBackProlongation(s,t)) continue;
745 {
746 Int_t nrows=fOuterSec->GetNRows()+fInnerSec->GetNRows();
747 if (s.GetNumberOfClusters() < Int_t(0.4*nrows)) continue;
748 }
749 s.PropagateTo(fParam->GetOuterRadiusUp());
750 s.CookdEdx();
751 CookLabel(&s,0.1); //For comparison only
752 UseClusters(&s,nc);
753 esd->UpdateTrackParams(&s,AliESDtrack::kTPCout);
754 ntrk++;
755 }
756 Info("PropagateBack","Number of back propagated tracks: %d",ntrk);
08dba16b 757
758 return 0;
759}
b9de75e1 760
b9de75e1 761//_________________________________________________________________________
762AliCluster *AliTPCtracker::GetCluster(Int_t index) const {
763 //--------------------------------------------------------------------
764 // Return pointer to a given cluster
765 //--------------------------------------------------------------------
766 Int_t sec=(index&0xff000000)>>24;
767 Int_t row=(index&0x00ff0000)>>16;
768 Int_t ncl=(index&0x0000ffff)>>00;
769
c630aafd 770 const AliTPCcluster *cl=0;
771
772 if (sec<fkNIS) {
773 cl=fInnerSec[sec][row].GetUnsortedCluster(ncl);
774 } else {
775 sec-=fkNIS;
776 cl=fOuterSec[sec][row].GetUnsortedCluster(ncl);
777 }
778
779 return (AliCluster*)cl;
b9de75e1 780}
781
782//__________________________________________________________________________
783void AliTPCtracker::CookLabel(AliKalmanTrack *t, Float_t wrong) const {
784 //--------------------------------------------------------------------
785 //This function "cooks" a track label. If label<0, this track is fake.
786 //--------------------------------------------------------------------
787 Int_t noc=t->GetNumberOfClusters();
788 Int_t *lb=new Int_t[noc];
789 Int_t *mx=new Int_t[noc];
790 AliCluster **clusters=new AliCluster*[noc];
791
792 Int_t i;
793 for (i=0; i<noc; i++) {
794 lb[i]=mx[i]=0;
795 Int_t index=t->GetClusterIndex(i);
796 clusters[i]=GetCluster(index);
797 }
798
799 Int_t lab=123456789;
800 for (i=0; i<noc; i++) {
801 AliCluster *c=clusters[i];
802 lab=TMath::Abs(c->GetLabel(0));
803 Int_t j;
804 for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break;
805 lb[j]=lab;
806 (mx[j])++;
807 }
808
809 Int_t max=0;
810 for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];}
811
812 for (i=0; i<noc; i++) {
813 AliCluster *c=clusters[i];
814 if (TMath::Abs(c->GetLabel(1)) == lab ||
815 TMath::Abs(c->GetLabel(2)) == lab ) max++;
816 }
817
818 if ((1.- Float_t(max)/noc) > wrong) lab=-lab;
819
820 else {
821 Int_t tail=Int_t(0.10*noc);
822 max=0;
823 for (i=1; i<=tail; i++) {
824 AliCluster *c=clusters[noc-i];
825 if (lab == TMath::Abs(c->GetLabel(0)) ||
826 lab == TMath::Abs(c->GetLabel(1)) ||
827 lab == TMath::Abs(c->GetLabel(2))) max++;
828 }
829 if (max < Int_t(0.5*tail)) lab=-lab;
830 }
831
832 t->SetLabel(lab);
833
834 delete[] lb;
835 delete[] mx;
836 delete[] clusters;
837}
838
839//_________________________________________________________________________
840void AliTPCtracker::AliTPCSector::Setup(const AliTPCParam *par, Int_t f) {
841 //-----------------------------------------------------------------------
842 // Setup inner sector
843 //-----------------------------------------------------------------------
844 if (f==0) {
845 fAlpha=par->GetInnerAngle();
846 fAlphaShift=par->GetInnerAngleShift();
847 fPadPitchWidth=par->GetInnerPadPitchWidth();
024a7fe9 848 f1PadPitchLength=par->GetInnerPadPitchLength();
849 f2PadPitchLength=f1PadPitchLength;
b9de75e1 850
851 fN=par->GetNRowLow();
852 fRow=new AliTPCRow[fN];
853 for (Int_t i=0; i<fN; i++) fRow[i].SetX(par->GetPadRowRadiiLow(i));
854 } else {
855 fAlpha=par->GetOuterAngle();
856 fAlphaShift=par->GetOuterAngleShift();
857 fPadPitchWidth=par->GetOuterPadPitchWidth();
f03e3423 858 f1PadPitchLength=par->GetOuter1PadPitchLength();
859 f2PadPitchLength=par->GetOuter2PadPitchLength();
b9de75e1 860
861 fN=par->GetNRowUp();
862 fRow=new AliTPCRow[fN];
f03e3423 863 for (Int_t i=0; i<fN; i++){
864 fRow[i].SetX(par->GetPadRowRadiiUp(i));
865 }
b9de75e1 866 }
867}
868
73042f01 869//_________________________________________________________________________
c630aafd 870void AliTPCtracker::
871AliTPCRow::InsertCluster(const AliTPCcluster* c, Int_t sec, Int_t row) {
73042f01 872 //-----------------------------------------------------------------------
873 // Insert a cluster into this pad row in accordence with its y-coordinate
874 //-----------------------------------------------------------------------
b9de75e1 875 if (fN==kMaxClusterPerRow) {
c630aafd 876 ::Error("InsertCluster","Too many clusters !");
877 return;
878 }
879
880 Int_t index=(((sec<<8)+row)<<16)+fN;
881
882 if (fN==0) {
883 fSize=kMaxClusterPerRow/8;
884 fClusterArray=new AliTPCcluster[fSize];
885 fIndex[0]=index;
886 fClusterArray[0]=*c; fClusters[fN++]=fClusterArray;
887 return;
73042f01 888 }
c630aafd 889
890 if (fN==fSize) {
891 Int_t size=fSize*2;
892 AliTPCcluster *buff=new AliTPCcluster[size];
893 memcpy(buff,fClusterArray,fSize*sizeof(AliTPCcluster));
894 for (Int_t i=0; i<fN; i++)
895 fClusters[i]=buff+(fClusters[i]-fClusterArray);
896 delete[] fClusterArray;
897 fClusterArray=buff;
898 fSize=size;
899 }
900
73042f01 901 Int_t i=Find(c->GetY());
902 memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliTPCcluster*));
903 memmove(fIndex +i+1 ,fIndex +i,(fN-i)*sizeof(UInt_t));
c630aafd 904 fIndex[i]=index;
905 fClusters[i]=fClusterArray+fN; fClusterArray[fN++]=*c;
73042f01 906}
907
908//___________________________________________________________________
909Int_t AliTPCtracker::AliTPCRow::Find(Double_t y) const {
910 //-----------------------------------------------------------------------
911 // Return the index of the nearest cluster
912 //-----------------------------------------------------------------------
11c7b548 913 if(fN<=0) return 0;
73042f01 914 if (y <= fClusters[0]->GetY()) return 0;
915 if (y > fClusters[fN-1]->GetY()) return fN;
916 Int_t b=0, e=fN-1, m=(b+e)/2;
917 for (; b<e; m=(b+e)/2) {
918 if (y > fClusters[m]->GetY()) b=m+1;
919 else e=m;
920 }
921 return m;
922}
923
924//_____________________________________________________________________________
925void AliTPCtracker::AliTPCseed::CookdEdx(Double_t low, Double_t up) {
926 //-----------------------------------------------------------------
927 // This funtion calculates dE/dX within the "low" and "up" cuts.
928 //-----------------------------------------------------------------
929 Int_t i;
be9c5115 930 Int_t nc=GetNumberOfClusters();
c630aafd 931
932 Int_t swap;//stupid sorting
933 do {
934 swap=0;
935 for (i=0; i<nc-1; i++) {
936 if (fdEdxSample[i]<=fdEdxSample[i+1]) continue;
937 Float_t tmp=fdEdxSample[i];
938 fdEdxSample[i]=fdEdxSample[i+1]; fdEdxSample[i+1]=tmp;
939 swap++;
940 }
941 } while (swap);
73042f01 942
be9c5115 943 Int_t nl=Int_t(low*nc), nu=Int_t(up*nc);
73042f01 944 Float_t dedx=0;
c630aafd 945 for (i=nl; i<=nu; i++) dedx += fdEdxSample[i];
73042f01 946 dedx /= (nu-nl+1);
947 SetdEdx(dedx);
7f6ddf58 948
14718359 949 return;
73042f01 950}
951
73042f01 952
953