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81e97e0d 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
18
19//-----------------------------------------------------------------
20// Implementation of the TPC seed class
21// This class is used by the AliTPCtrackerMI class
22// Origin: Marian Ivanov, CERN, Marian.Ivanov@cern.ch
23//-----------------------------------------------------------------
24#include "TClonesArray.h"
25#include "AliTPCseed.h"
3f82c4f2 26#include "AliTPCReconstructor.h"
81e97e0d 27
28ClassImp(AliTPCseed)
29
30
31
32fab534 32AliTPCseed::AliTPCseed():
33 AliTPCtrack(),
34 fEsd(0x0),
2928bdf0 35 fClusterOwner(kFALSE),
32fab534 36 fPoints(0x0),
37 fEPoints(0x0),
38 fRow(0),
39 fSector(-1),
40 fRelativeSector(-1),
41 fCurrentSigmaY2(1e10),
42 fCurrentSigmaZ2(1e10),
43 fErrorY2(1e10),
44 fErrorZ2(1e10),
45 fCurrentCluster(0x0),
46 fCurrentClusterIndex1(-1),
47 fInDead(kFALSE),
48 fIsSeeding(kFALSE),
49 fNoCluster(0),
50 fSort(0),
51 fBSigned(kFALSE),
52 fSeedType(0),
53 fSeed1(-1),
54 fSeed2(-1),
55 fMAngular(0),
56 fCircular(0)
57{
81e97e0d 58 //
5c09947e 59 for (Int_t i=0;i<160;i++) SetClusterIndex2(i,-3);
81e97e0d 60 for (Int_t i=0;i<160;i++) fClusterPointer[i]=0;
61 for (Int_t i=0;i<3;i++) fKinkIndexes[i]=0;
32fab534 62 for (Int_t i=0;i<AliPID::kSPECIES;i++) fTPCr[i]=0.2;
63 for (Int_t i=0;i<4;i++) {
64 fDEDX[i] = 0.;
65 fSDEDX[i] = 1e10;
66 fNCDEDX[i] = 0;
67 }
68 for (Int_t i=0;i<12;i++) fOverlapLabels[i] = -1;
81e97e0d 69}
32fab534 70
2928bdf0 71AliTPCseed::AliTPCseed(const AliTPCseed &s, Bool_t clusterOwner):
32fab534 72 AliTPCtrack(s),
73 fEsd(0x0),
2928bdf0 74 fClusterOwner(clusterOwner),
32fab534 75 fPoints(0x0),
76 fEPoints(0x0),
77 fRow(0),
78 fSector(-1),
79 fRelativeSector(-1),
80 fCurrentSigmaY2(1e10),
81 fCurrentSigmaZ2(1e10),
82 fErrorY2(1e10),
83 fErrorZ2(1e10),
84 fCurrentCluster(0x0),
85 fCurrentClusterIndex1(-1),
86 fInDead(kFALSE),
87 fIsSeeding(kFALSE),
88 fNoCluster(0),
89 fSort(0),
90 fBSigned(kFALSE),
91 fSeedType(0),
92 fSeed1(-1),
93 fSeed2(-1),
94 fMAngular(0),
95 fCircular(0)
96{
81e97e0d 97 //---------------------
98 // dummy copy constructor
99 //-------------------------
2928bdf0 100 for (Int_t i=0;i<160;i++) {
101 fClusterPointer[i]=0;
102 if (fClusterOwner){
103 if (s.fClusterPointer[i])
104 fClusterPointer[i] = new AliTPCclusterMI(*(s.fClusterPointer[i]));
105 }else{
106 fClusterPointer[i] = s.fClusterPointer[i];
107 }
108 fTrackPoints[i] = s.fTrackPoints[i];
109 }
81e97e0d 110 for (Int_t i=0;i<160;i++) fIndex[i] = s.fIndex[i];
5c09947e 111 for (Int_t i=0;i<AliPID::kSPECIES;i++) fTPCr[i]=s.fTPCr[i];
112 for (Int_t i=0;i<4;i++) {
113 fDEDX[i] = s.fDEDX[i];
114 fSDEDX[i] = s.fSDEDX[i];
115 fNCDEDX[i] = s.fNCDEDX[i];
116 }
117 for (Int_t i=0;i<12;i++) fOverlapLabels[i] = s.fOverlapLabels[i];
81e97e0d 118}
5c09947e 119
120
32fab534 121AliTPCseed::AliTPCseed(const AliTPCtrack &t):
122 AliTPCtrack(t),
123 fEsd(0x0),
2928bdf0 124 fClusterOwner(kFALSE),
32fab534 125 fPoints(0x0),
126 fEPoints(0x0),
127 fRow(0),
128 fSector(-1),
129 fRelativeSector(-1),
130 fCurrentSigmaY2(1e10),
131 fCurrentSigmaZ2(1e10),
132 fErrorY2(1e10),
133 fErrorZ2(1e10),
134 fCurrentCluster(0x0),
135 fCurrentClusterIndex1(-1),
136 fInDead(kFALSE),
137 fIsSeeding(kFALSE),
138 fNoCluster(0),
139 fSort(0),
140 fBSigned(kFALSE),
141 fSeedType(0),
142 fSeed1(-1),
143 fSeed2(-1),
144 fMAngular(0),
145 fCircular(0)
146{
81e97e0d 147 //
32fab534 148 // Constructor from AliTPCtrack
149 //
150 fFirstPoint =0;
105b1b81 151 for (Int_t i=0;i<5;i++) fTPCr[i]=0.2;
81e97e0d 152 for (Int_t i=0;i<160;i++) {
153 fClusterPointer[i] = 0;
154 Int_t index = t.GetClusterIndex(i);
155 if (index>=-1){
156 SetClusterIndex2(i,index);
157 }
158 else{
159 SetClusterIndex2(i,-3);
160 }
161 }
32fab534 162 for (Int_t i=0;i<4;i++) {
163 fDEDX[i] = 0.;
164 fSDEDX[i] = 1e10;
165 fNCDEDX[i] = 0;
166 }
167 for (Int_t i=0;i<12;i++) fOverlapLabels[i] = -1;
81e97e0d 168}
169
6c94f330 170AliTPCseed::AliTPCseed(Double_t xr, Double_t alpha, const Double_t xx[5],
171 const Double_t cc[15], Int_t index):
172 AliTPCtrack(xr, alpha, xx, cc, index),
32fab534 173 fEsd(0x0),
2928bdf0 174 fClusterOwner(kFALSE),
32fab534 175 fPoints(0x0),
176 fEPoints(0x0),
177 fRow(0),
178 fSector(-1),
179 fRelativeSector(-1),
180 fCurrentSigmaY2(1e10),
181 fCurrentSigmaZ2(1e10),
182 fErrorY2(1e10),
183 fErrorZ2(1e10),
184 fCurrentCluster(0x0),
185 fCurrentClusterIndex1(-1),
186 fInDead(kFALSE),
187 fIsSeeding(kFALSE),
188 fNoCluster(0),
189 fSort(0),
190 fBSigned(kFALSE),
191 fSeedType(0),
192 fSeed1(-1),
193 fSeed2(-1),
194 fMAngular(0),
195 fCircular(0)
196{
197 //
198 // Constructor
81e97e0d 199 //
32fab534 200 fFirstPoint =0;
5c09947e 201 for (Int_t i=0;i<160;i++) SetClusterIndex2(i,-3);
81e97e0d 202 for (Int_t i=0;i<160;i++) fClusterPointer[i]=0;
81e97e0d 203 for (Int_t i=0;i<5;i++) fTPCr[i]=0.2;
32fab534 204 for (Int_t i=0;i<4;i++) {
205 fDEDX[i] = 0.;
206 fSDEDX[i] = 1e10;
207 fNCDEDX[i] = 0;
208 }
209 for (Int_t i=0;i<12;i++) fOverlapLabels[i] = -1;
81e97e0d 210}
211
212AliTPCseed::~AliTPCseed(){
213 //
214 // destructor
215 if (fPoints) delete fPoints;
216 fPoints =0;
217 if (fEPoints) delete fEPoints;
218 fEPoints = 0;
219 fNoCluster =0;
2928bdf0 220 if (fClusterOwner){
221 for (Int_t icluster=0; icluster<160; icluster++){
222 delete fClusterPointer[icluster];
223 }
224 }
81e97e0d 225}
179c6296 226//_________________________________________________
227AliTPCseed & AliTPCseed::operator =(const AliTPCseed & param)
228{
229 //
230 // assignment operator - dummy
231 //
232 fRow=param.fRow;
233 return (*this);
234}
235//____________________________________________________
81e97e0d 236AliTPCTrackerPoint * AliTPCseed::GetTrackPoint(Int_t i)
237{
238 //
239 //
240 return &fTrackPoints[i];
241}
242
243void AliTPCseed::RebuildSeed()
244{
245 //
246 // rebuild seed to be ready for storing
247 AliTPCclusterMI cldummy;
248 cldummy.SetQ(0);
249 AliTPCTrackPoint pdummy;
b9671574 250 pdummy.GetTPoint().SetShared(10);
81e97e0d 251 for (Int_t i=0;i<160;i++){
252 AliTPCclusterMI * cl0 = fClusterPointer[i];
253 AliTPCTrackPoint *trpoint = (AliTPCTrackPoint*)fPoints->UncheckedAt(i);
254 if (cl0){
255 trpoint->GetTPoint() = *(GetTrackPoint(i));
256 trpoint->GetCPoint() = *cl0;
257 trpoint->GetCPoint().SetQ(TMath::Abs(cl0->GetQ()));
258 }
259 else{
260 *trpoint = pdummy;
261 trpoint->GetCPoint()= cldummy;
262 }
263
264 }
265
266}
267
268
269Double_t AliTPCseed::GetDensityFirst(Int_t n)
270{
271 //
272 //
273 // return cluster for n rows bellow first point
274 Int_t nfoundable = 1;
275 Int_t nfound = 1;
276 for (Int_t i=fLastPoint-1;i>0&&nfoundable<n; i--){
277 Int_t index = GetClusterIndex2(i);
278 if (index!=-1) nfoundable++;
279 if (index>0) nfound++;
280 }
281 if (nfoundable<n) return 0;
282 return Double_t(nfound)/Double_t(nfoundable);
283
284}
285
286
287void AliTPCseed::GetClusterStatistic(Int_t first, Int_t last, Int_t &found, Int_t &foundable, Int_t &shared, Bool_t plus2)
288{
289 // get cluster stat. on given region
290 //
291 found = 0;
292 foundable = 0;
293 shared =0;
294 for (Int_t i=first;i<last; i++){
295 Int_t index = GetClusterIndex2(i);
296 if (index!=-1) foundable++;
297 if (fClusterPointer[i]) {
298 found++;
299 }
300 else
301 continue;
302
303 if (fClusterPointer[i]->IsUsed(10)) {
304 shared++;
305 continue;
306 }
307 if (!plus2) continue; //take also neighborhoud
308 //
309 if ( (i>0) && fClusterPointer[i-1]){
310 if (fClusterPointer[i-1]->IsUsed(10)) {
311 shared++;
312 continue;
313 }
314 }
315 if ( fClusterPointer[i+1]){
316 if (fClusterPointer[i+1]->IsUsed(10)) {
317 shared++;
318 continue;
319 }
320 }
321
322 }
323 //if (shared>found){
324 //Error("AliTPCseed::GetClusterStatistic","problem\n");
325 //}
326}
327
328
329
330
331
332void AliTPCseed::Reset(Bool_t all)
333{
334 //
335 //
336 SetNumberOfClusters(0);
337 fNFoundable = 0;
338 SetChi2(0);
6c94f330 339 ResetCovariance(10.);
81e97e0d 340 /*
341 if (fTrackPoints){
342 for (Int_t i=0;i<8;i++){
343 delete [] fTrackPoints[i];
344 }
345 delete fTrackPoints;
346 fTrackPoints =0;
347 }
348 */
349
350 if (all){
351 for (Int_t i=0;i<200;i++) SetClusterIndex2(i,-3);
352 for (Int_t i=0;i<160;i++) fClusterPointer[i]=0;
353 }
354
355}
356
357
358void AliTPCseed::Modify(Double_t factor)
359{
360
361 //------------------------------------------------------------------
362 //This function makes a track forget its history :)
363 //------------------------------------------------------------------
364 if (factor<=0) {
6c94f330 365 ResetCovariance(10.);
81e97e0d 366 return;
367 }
6c94f330 368 ResetCovariance(factor);
369
81e97e0d 370 SetNumberOfClusters(0);
371 fNFoundable =0;
372 SetChi2(0);
373 fRemoval = 0;
374 fCurrentSigmaY2 = 0.000005;
375 fCurrentSigmaZ2 = 0.000005;
376 fNoCluster = 0;
377 //fFirstPoint = 160;
378 //fLastPoint = 0;
379}
380
381
382
383
384Int_t AliTPCseed::GetProlongation(Double_t xk, Double_t &y, Double_t & z) const
385{
386 //-----------------------------------------------------------------
387 // This function find proloncation of a track to a reference plane x=xk.
388 // doesn't change internal state of the track
389 //-----------------------------------------------------------------
390
6c94f330 391 Double_t x1=GetX(), x2=x1+(xk-x1), dx=x2-x1;
81e97e0d 392
6c94f330 393 if (TMath::Abs(GetSnp()+GetC()*dx) >= AliTPCReconstructor::GetMaxSnpTrack()) {
81e97e0d 394 return 0;
395 }
396
397 // Double_t y1=fP0, z1=fP1;
6c94f330 398 Double_t c1=GetSnp(), r1=sqrt(1.- c1*c1);
399 Double_t c2=c1 + GetC()*dx, r2=sqrt(1.- c2*c2);
81e97e0d 400
6c94f330 401 y = GetY();
402 z = GetZ();
81e97e0d 403 //y += dx*(c1+c2)/(r1+r2);
404 //z += dx*(c1+c2)/(c1*r2 + c2*r1)*fP3;
405
406 Double_t dy = dx*(c1+c2)/(r1+r2);
407 Double_t dz = 0;
408 //
6c94f330 409 Double_t delta = GetC()*dx*(c1+c2)/(c1*r2 + c2*r1);
81e97e0d 410 /*
411 if (TMath::Abs(delta)>0.0001){
412 dz = fP3*TMath::ASin(delta)/fP4;
413 }else{
414 dz = dx*fP3*(c1+c2)/(c1*r2 + c2*r1);
415 }
416 */
417 // dz = fP3*AliTPCFastMath::FastAsin(delta)/fP4;
6c94f330 418 dz = GetTgl()*TMath::ASin(delta)/GetC();
81e97e0d 419 //
420 y+=dy;
421 z+=dz;
422
423
424 return 1;
425}
426
427
428//_____________________________________________________________________________
af32720d 429Double_t AliTPCseed::GetPredictedChi2(const AliCluster *c) const
81e97e0d 430{
431 //-----------------------------------------------------------------
432 // This function calculates a predicted chi2 increment.
433 //-----------------------------------------------------------------
6c94f330 434 Double_t p[2]={c->GetY(), c->GetZ()};
435 Double_t cov[3]={fErrorY2, 0., fErrorZ2};
436 return AliExternalTrackParam::GetPredictedChi2(p,cov);
81e97e0d 437}
438
81e97e0d 439//_________________________________________________________________________________________
440
441
442Int_t AliTPCseed::Compare(const TObject *o) const {
443 //-----------------------------------------------------------------
444 // This function compares tracks according to the sector - for given sector according z
445 //-----------------------------------------------------------------
446 AliTPCseed *t=(AliTPCseed*)o;
6c94f330 447
81e97e0d 448 if (fSort == 0){
449 if (t->fRelativeSector>fRelativeSector) return -1;
450 if (t->fRelativeSector<fRelativeSector) return 1;
451 Double_t z2 = t->GetZ();
452 Double_t z1 = GetZ();
453 if (z2>z1) return 1;
454 if (z2<z1) return -1;
455 return 0;
456 }
457 else {
458 Float_t f2 =1;
6c94f330 459 f2 = 1-20*TMath::Sqrt(t->GetSigma1Pt2())/(TMath::Abs(t->Get1Pt())+0.0066);
81e97e0d 460 if (t->fBConstrain) f2=1.2;
461
462 Float_t f1 =1;
6c94f330 463 f1 = 1-20*TMath::Sqrt(GetSigma1Pt2())/(TMath::Abs(Get1Pt())+0.0066);
81e97e0d 464
465 if (fBConstrain) f1=1.2;
466
467 if (t->GetNumberOfClusters()*f2 <GetNumberOfClusters()*f1) return -1;
468 else return +1;
469 }
470}
471
472
473
474
475//_____________________________________________________________________________
6c94f330 476Bool_t AliTPCseed::Update(const AliCluster *c, Double_t chisq, Int_t /*index*/)
477{
81e97e0d 478 //-----------------------------------------------------------------
479 // This function associates a cluster with this track.
480 //-----------------------------------------------------------------
6c94f330 481 Double_t p[2]={c->GetY(), c->GetZ()};
482 Double_t cov[3]={fErrorY2, 0., fErrorZ2};
81e97e0d 483
6c94f330 484 if (!AliExternalTrackParam::Update(p,cov)) return kFALSE;
81e97e0d 485
486 Int_t n=GetNumberOfClusters();
487 // fIndex[n]=index;
488 SetNumberOfClusters(n+1);
489 SetChi2(GetChi2()+chisq);
490
6c94f330 491 return kTRUE;
81e97e0d 492}
493
494
495
496//_____________________________________________________________________________
105b1b81 497Float_t AliTPCseed::CookdEdx(Double_t low, Double_t up,Int_t i1, Int_t i2, Bool_t onlyused) {
81e97e0d 498 //-----------------------------------------------------------------
499 // This funtion calculates dE/dX within the "low" and "up" cuts.
500 //-----------------------------------------------------------------
501
502 Float_t amp[200];
503 Float_t angular[200];
504 Float_t weight[200];
505 Int_t index[200];
506 //Int_t nc = 0;
507 // TClonesArray & arr = *fPoints;
508 Float_t meanlog = 100.;
509
510 Float_t mean[4] = {0,0,0,0};
511 Float_t sigma[4] = {1000,1000,1000,1000};
512 Int_t nc[4] = {0,0,0,0};
513 Float_t norm[4] = {1000,1000,1000,1000};
514 //
515 //
516 fNShared =0;
517
518 for (Int_t of =0; of<4; of++){
519 for (Int_t i=of+i1;i<i2;i+=4)
520 {
521 Int_t index = fIndex[i];
522 if (index<0||index&0x8000) continue;
523
524 //AliTPCTrackPoint * point = (AliTPCTrackPoint *) arr.At(i);
525 AliTPCTrackerPoint * point = GetTrackPoint(i);
526 //AliTPCTrackerPoint * pointm = GetTrackPoint(i-1);
527 //AliTPCTrackerPoint * pointp = 0;
528 //if (i<159) pointp = GetTrackPoint(i+1);
529
530 if (point==0) continue;
531 AliTPCclusterMI * cl = fClusterPointer[i];
532 if (cl==0) continue;
533 if (onlyused && (!cl->IsUsed(10))) continue;
534 if (cl->IsUsed(11)) {
535 fNShared++;
536 continue;
537 }
538 Int_t type = cl->GetType();
539 //if (point->fIsShared){
540 // fNShared++;
541 // continue;
542 //}
543 //if (pointm)
544 // if (pointm->fIsShared) continue;
545 //if (pointp)
546 // if (pointp->fIsShared) continue;
547
548 if (type<0) continue;
549 //if (type>10) continue;
550 //if (point->GetErrY()==0) continue;
551 //if (point->GetErrZ()==0) continue;
552
553 //Float_t ddy = (point->GetY()-cl->GetY())/point->GetErrY();
554 //Float_t ddz = (point->GetZ()-cl->GetZ())/point->GetErrZ();
555 //if ((ddy*ddy+ddz*ddz)>10) continue;
556
557
558 // if (point->GetCPoint().GetMax()<5) continue;
559 if (cl->GetMax()<5) continue;
560 Float_t angley = point->GetAngleY();
561 Float_t anglez = point->GetAngleZ();
562
563 Float_t rsigmay2 = point->GetSigmaY();
564 Float_t rsigmaz2 = point->GetSigmaZ();
565 /*
566 Float_t ns = 1.;
567 if (pointm){
568 rsigmay += pointm->GetTPoint().GetSigmaY();
569 rsigmaz += pointm->GetTPoint().GetSigmaZ();
570 ns+=1.;
571 }
572 if (pointp){
573 rsigmay += pointp->GetTPoint().GetSigmaY();
574 rsigmaz += pointp->GetTPoint().GetSigmaZ();
575 ns+=1.;
576 }
577 rsigmay/=ns;
578 rsigmaz/=ns;
579 */
580
581 Float_t rsigma = TMath::Sqrt(rsigmay2*rsigmaz2);
582
583 Float_t ampc = 0; // normalization to the number of electrons
584 if (i>64){
585 // ampc = 1.*point->GetCPoint().GetMax();
586 ampc = 1.*cl->GetMax();
587 //ampc = 1.*point->GetCPoint().GetQ();
588 // AliTPCClusterPoint & p = point->GetCPoint();
589 // Float_t dy = TMath::Abs(Int_t( TMath::Abs(p.GetY()/0.6)) - TMath::Abs(p.GetY()/0.6)+0.5);
590 // Float_t iz = (250.0-TMath::Abs(p.GetZ())+0.11)/0.566;
591 //Float_t dz =
592 // TMath::Abs( Int_t(iz) - iz + 0.5);
593 //ampc *= 1.15*(1-0.3*dy);
594 //ampc *= 1.15*(1-0.3*dz);
595 // Float_t zfactor = (AliTPCReconstructor::GetCtgRange()-0.0004*TMath::Abs(point->GetCPoint().GetZ()));
596 //ampc *=zfactor;
597 }
598 else{
599 //ampc = 1.0*point->GetCPoint().GetMax();
600 ampc = 1.0*cl->GetMax();
601 //ampc = 1.0*point->GetCPoint().GetQ();
602 //AliTPCClusterPoint & p = point->GetCPoint();
603 // Float_t dy = TMath::Abs(Int_t( TMath::Abs(p.GetY()/0.4)) - TMath::Abs(p.GetY()/0.4)+0.5);
604 //Float_t iz = (250.0-TMath::Abs(p.GetZ())+0.11)/0.566;
605 //Float_t dz =
606 // TMath::Abs( Int_t(iz) - iz + 0.5);
607
608 //ampc *= 1.15*(1-0.3*dy);
609 //ampc *= 1.15*(1-0.3*dz);
610 // Float_t zfactor = (1.02-0.000*TMath::Abs(point->GetCPoint().GetZ()));
611 //ampc *=zfactor;
612
613 }
614 ampc *= 2.0; // put mean value to channel 50
615 //ampc *= 0.58; // put mean value to channel 50
616 Float_t w = 1.;
617 // if (type>0) w = 1./(type/2.-0.5);
618 // Float_t z = TMath::Abs(cl->GetZ());
619 if (i<64) {
620 ampc /= 0.6;
621 //ampc /= (1+0.0008*z);
622 } else
623 if (i>128){
624 ampc /=1.5;
625 //ampc /= (1+0.0008*z);
626 }else{
627 //ampc /= (1+0.0008*z);
628 }
629
630 if (type<0) { //amp at the border - lower weight
631 // w*= 2.;
632
633 continue;
634 }
635 if (rsigma>1.5) ampc/=1.3; // if big backround
636 amp[nc[of]] = ampc;
637 angular[nc[of]] = TMath::Sqrt(1.+angley*angley+anglez*anglez);
638 weight[nc[of]] = w;
639 nc[of]++;
640 }
641
642 TMath::Sort(nc[of],amp,index,kFALSE);
643 Float_t sumamp=0;
644 Float_t sumamp2=0;
645 Float_t sumw=0;
646 //meanlog = amp[index[Int_t(nc[of]*0.33)]];
647 meanlog = 50;
648 for (Int_t i=int(nc[of]*low+0.5);i<int(nc[of]*up+0.5);i++){
649 Float_t ampl = amp[index[i]]/angular[index[i]];
650 ampl = meanlog*TMath::Log(1.+ampl/meanlog);
651 //
652 sumw += weight[index[i]];
653 sumamp += weight[index[i]]*ampl;
654 sumamp2 += weight[index[i]]*ampl*ampl;
655 norm[of] += angular[index[i]]*weight[index[i]];
656 }
657 if (sumw<1){
658 SetdEdx(0);
659 }
660 else {
661 norm[of] /= sumw;
662 mean[of] = sumamp/sumw;
663 sigma[of] = sumamp2/sumw-mean[of]*mean[of];
664 if (sigma[of]>0.1)
665 sigma[of] = TMath::Sqrt(sigma[of]);
666 else
667 sigma[of] = 1000;
668
669 mean[of] = (TMath::Exp(mean[of]/meanlog)-1)*meanlog;
670 //mean *=(1-0.02*(sigma/(mean*0.17)-1.));
671 //mean *=(1-0.1*(norm-1.));
672 }
673 }
674
675 Float_t dedx =0;
676 fSdEdx =0;
677 fMAngular =0;
678 // mean[0]*= (1-0.05*(sigma[0]/(0.01+mean[1]*0.18)-1));
679 // mean[1]*= (1-0.05*(sigma[1]/(0.01+mean[0]*0.18)-1));
680
681
682 // dedx = (mean[0]* TMath::Sqrt((1.+nc[0]))+ mean[1]* TMath::Sqrt((1.+nc[1])) )/
683 // ( TMath::Sqrt((1.+nc[0]))+TMath::Sqrt((1.+nc[1])));
684
685 Int_t norm2 = 0;
686 Int_t norm3 = 0;
687 for (Int_t i =0;i<4;i++){
688 if (nc[i]>2&&nc[i]<1000){
689 dedx += mean[i] *nc[i];
690 fSdEdx += sigma[i]*(nc[i]-2);
691 fMAngular += norm[i] *nc[i];
692 norm2 += nc[i];
693 norm3 += nc[i]-2;
694 }
695 fDEDX[i] = mean[i];
696 fSDEDX[i] = sigma[i];
697 fNCDEDX[i]= nc[i];
698 }
699
700 if (norm3>0){
701 dedx /=norm2;
702 fSdEdx /=norm3;
703 fMAngular/=norm2;
704 }
705 else{
706 SetdEdx(0);
105b1b81 707 return 0;
81e97e0d 708 }
709 // Float_t dedx1 =dedx;
710 /*
711 dedx =0;
712 for (Int_t i =0;i<4;i++){
713 if (nc[i]>2&&nc[i]<1000){
714 mean[i] = mean[i]*(1-0.12*(sigma[i]/(fSdEdx)-1.));
715 dedx += mean[i] *nc[i];
716 }
717 fDEDX[i] = mean[i];
718 }
719 dedx /= norm2;
720 */
721
722
723 SetdEdx(dedx);
a2d457f2 724 return dedx;
81e97e0d 725}
726Double_t AliTPCseed::Bethe(Double_t bg){
727 //
728 // This is the Bethe-Bloch function normalised to 1 at the minimum
729 //
730 Double_t bg2=bg*bg;
731 Double_t bethe;
732 if (bg<3.5e1)
733 bethe=(1.+ bg2)/bg2*(log(5940*bg2) - bg2/(1.+ bg2));
734 else // Density effect ( approximately :)
735 bethe=1.15*(1.+ bg2)/bg2*(log(3.5*5940*bg) - bg2/(1.+ bg2));
736 return bethe/11.091;
737}
738
739void AliTPCseed::CookPID()
740{
741 //
742 // cook PID information according dEdx
743 //
744 Double_t fRange = 10.;
745 Double_t fRes = 0.1;
746 Double_t fMIP = 47.;
747 //
748 Int_t ns=AliPID::kSPECIES;
749 Double_t sumr =0;
750 for (Int_t j=0; j<ns; j++) {
751 Double_t mass=AliPID::ParticleMass(j);
6c94f330 752 Double_t mom=GetP();
81e97e0d 753 Double_t dedx=fdEdx/fMIP;
754 Double_t bethe=Bethe(mom/mass);
755 Double_t sigma=fRes*bethe;
756 if (sigma>0.001){
757 if (TMath::Abs(dedx-bethe) > fRange*sigma) {
758 fTPCr[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
759 sumr+=fTPCr[j];
760 continue;
761 }
762 fTPCr[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
763 sumr+=fTPCr[j];
764 }
765 else{
766 fTPCr[j]=1.;
767 sumr+=fTPCr[j];
768 }
769 }
770 for (Int_t j=0; j<ns; j++) {
771 fTPCr[j]/=sumr; //normalize
772 }
773}
774
775/*
776void AliTPCseed::CookdEdx2(Double_t low, Double_t up) {
777 //-----------------------------------------------------------------
778 // This funtion calculates dE/dX within the "low" and "up" cuts.
779 //-----------------------------------------------------------------
780
781 Float_t amp[200];
782 Float_t angular[200];
783 Float_t weight[200];
784 Int_t index[200];
785 Bool_t inlimit[200];
786 for (Int_t i=0;i<200;i++) inlimit[i]=kFALSE;
787 for (Int_t i=0;i<200;i++) amp[i]=10000;
788 for (Int_t i=0;i<200;i++) angular[i]= 1;;
789
790
791 //
792 Float_t meanlog = 100.;
793 Int_t indexde[4]={0,64,128,160};
794
795 Float_t amean =0;
796 Float_t asigma =0;
797 Float_t anc =0;
798 Float_t anorm =0;
799
800 Float_t mean[4] = {0,0,0,0};
801 Float_t sigma[4] = {1000,1000,1000,1000};
802 Int_t nc[4] = {0,0,0,0};
803 Float_t norm[4] = {1000,1000,1000,1000};
804 //
805 //
806 fNShared =0;
807
808 // for (Int_t of =0; of<3; of++){
809 // for (Int_t i=indexde[of];i<indexde[of+1];i++)
810 for (Int_t i =0; i<160;i++)
811 {
812 AliTPCTrackPoint * point = GetTrackPoint(i);
813 if (point==0) continue;
814 if (point->fIsShared){
815 fNShared++;
816 continue;
817 }
818 Int_t type = point->GetCPoint().GetType();
819 if (type<0) continue;
820 if (point->GetCPoint().GetMax()<5) continue;
821 Float_t angley = point->GetTPoint().GetAngleY();
822 Float_t anglez = point->GetTPoint().GetAngleZ();
823 Float_t rsigmay = point->GetCPoint().GetSigmaY();
824 Float_t rsigmaz = point->GetCPoint().GetSigmaZ();
825 Float_t rsigma = TMath::Sqrt(rsigmay*rsigmaz);
826
827 Float_t ampc = 0; // normalization to the number of electrons
828 if (i>64){
829 ampc = point->GetCPoint().GetMax();
830 }
831 else{
832 ampc = point->GetCPoint().GetMax();
833 }
834 ampc *= 2.0; // put mean value to channel 50
835 // ampc *= 0.565; // put mean value to channel 50
836
837 Float_t w = 1.;
838 Float_t z = TMath::Abs(point->GetCPoint().GetZ());
839 if (i<64) {
840 ampc /= 0.63;
841 } else
842 if (i>128){
843 ampc /=1.51;
844 }
845 if (type<0) { //amp at the border - lower weight
846 continue;
847 }
848 if (rsigma>1.5) ampc/=1.3; // if big backround
849 angular[i] = TMath::Sqrt(1.+angley*angley+anglez*anglez);
850 amp[i] = ampc/angular[i];
851 weight[i] = w;
852 anc++;
853 }
854
855 TMath::Sort(159,amp,index,kFALSE);
856 for (Int_t i=int(anc*low+0.5);i<int(anc*up+0.5);i++){
857 inlimit[index[i]] = kTRUE; // take all clusters
858 }
859
860 // meanlog = amp[index[Int_t(anc*0.3)]];
861 meanlog =10000.;
862 for (Int_t of =0; of<3; of++){
863 Float_t sumamp=0;
864 Float_t sumamp2=0;
865 Float_t sumw=0;
866 for (Int_t i=indexde[of];i<indexde[of+1];i++)
867 {
868 if (inlimit[i]==kFALSE) continue;
869 Float_t ampl = amp[i];
870 ///angular[i];
871 ampl = meanlog*TMath::Log(1.+ampl/meanlog);
872 //
873 sumw += weight[i];
874 sumamp += weight[i]*ampl;
875 sumamp2 += weight[i]*ampl*ampl;
876 norm[of] += angular[i]*weight[i];
877 nc[of]++;
878 }
879 if (sumw<1){
880 SetdEdx(0);
881 }
882 else {
883 norm[of] /= sumw;
884 mean[of] = sumamp/sumw;
885 sigma[of] = sumamp2/sumw-mean[of]*mean[of];
886 if (sigma[of]>0.1)
887 sigma[of] = TMath::Sqrt(sigma[of]);
888 else
889 sigma[of] = 1000;
890 mean[of] = (TMath::Exp(mean[of]/meanlog)-1)*meanlog;
891 }
892 }
893
894 Float_t dedx =0;
895 fSdEdx =0;
896 fMAngular =0;
897 //
898 Int_t norm2 = 0;
899 Int_t norm3 = 0;
900 Float_t www[3] = {12.,14.,17.};
901 //Float_t www[3] = {1.,1.,1.};
902
903 for (Int_t i =0;i<3;i++){
904 if (nc[i]>2&&nc[i]<1000){
905 dedx += mean[i] *nc[i]*www[i]/sigma[i];
906 fSdEdx += sigma[i]*(nc[i]-2)*www[i]/sigma[i];
907 fMAngular += norm[i] *nc[i];
908 norm2 += nc[i]*www[i]/sigma[i];
909 norm3 += (nc[i]-2)*www[i]/sigma[i];
910 }
911 fDEDX[i] = mean[i];
912 fSDEDX[i] = sigma[i];
913 fNCDEDX[i]= nc[i];
914 }
915
916 if (norm3>0){
917 dedx /=norm2;
918 fSdEdx /=norm3;
919 fMAngular/=norm2;
920 }
921 else{
922 SetdEdx(0);
923 return;
924 }
925 // Float_t dedx1 =dedx;
926
927 dedx =0;
928 Float_t norm4 = 0;
929 for (Int_t i =0;i<3;i++){
930 if (nc[i]>2&&nc[i]<1000&&sigma[i]>3){
931 //mean[i] = mean[i]*(1+0.08*(sigma[i]/(fSdEdx)-1.));
932 dedx += mean[i] *(nc[i])/(sigma[i]);
933 norm4 += (nc[i])/(sigma[i]);
934 }
935 fDEDX[i] = mean[i];
936 }
937 if (norm4>0) dedx /= norm4;
938
939
940
941 SetdEdx(dedx);
942
943 //mi deDX
944
945}
946*/
6c94f330 947Double_t AliTPCseed::GetYat(Double_t xk) const {
948//-----------------------------------------------------------------
949// This function calculates the Y-coordinate of a track at the plane x=xk.
950//-----------------------------------------------------------------
951 if (TMath::Abs(GetSnp())>AliTPCReconstructor::GetMaxSnpTrack()) return 0.; //patch 01 jan 06
952 Double_t c1=GetSnp(), r1=TMath::Sqrt(1.- c1*c1);
953 Double_t c2=c1+GetC()*(xk-GetX());
954 if (TMath::Abs(c2)>AliTPCReconstructor::GetMaxSnpTrack()) return 0;
955 Double_t r2=TMath::Sqrt(1.- c2*c2);
956 return GetY() + (xk-GetX())*(c1+c2)/(r1+r2);
957}
958