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Common track parametrization in the barrel detectors (Yu.Belikov)
[u/mrichter/AliRoot.git] / TPC / AliTPCseed.cxx
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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}
226
227AliTPCTrackerPoint * AliTPCseed::GetTrackPoint(Int_t i)
228{
229 //
230 //
231 return &fTrackPoints[i];
232}
233
234void AliTPCseed::RebuildSeed()
235{
236 //
237 // rebuild seed to be ready for storing
238 AliTPCclusterMI cldummy;
239 cldummy.SetQ(0);
240 AliTPCTrackPoint pdummy;
241 pdummy.GetTPoint().fIsShared = 10;
242 for (Int_t i=0;i<160;i++){
243 AliTPCclusterMI * cl0 = fClusterPointer[i];
244 AliTPCTrackPoint *trpoint = (AliTPCTrackPoint*)fPoints->UncheckedAt(i);
245 if (cl0){
246 trpoint->GetTPoint() = *(GetTrackPoint(i));
247 trpoint->GetCPoint() = *cl0;
248 trpoint->GetCPoint().SetQ(TMath::Abs(cl0->GetQ()));
249 }
250 else{
251 *trpoint = pdummy;
252 trpoint->GetCPoint()= cldummy;
253 }
254
255 }
256
257}
258
259
260Double_t AliTPCseed::GetDensityFirst(Int_t n)
261{
262 //
263 //
264 // return cluster for n rows bellow first point
265 Int_t nfoundable = 1;
266 Int_t nfound = 1;
267 for (Int_t i=fLastPoint-1;i>0&&nfoundable<n; i--){
268 Int_t index = GetClusterIndex2(i);
269 if (index!=-1) nfoundable++;
270 if (index>0) nfound++;
271 }
272 if (nfoundable<n) return 0;
273 return Double_t(nfound)/Double_t(nfoundable);
274
275}
276
277
278void AliTPCseed::GetClusterStatistic(Int_t first, Int_t last, Int_t &found, Int_t &foundable, Int_t &shared, Bool_t plus2)
279{
280 // get cluster stat. on given region
281 //
282 found = 0;
283 foundable = 0;
284 shared =0;
285 for (Int_t i=first;i<last; i++){
286 Int_t index = GetClusterIndex2(i);
287 if (index!=-1) foundable++;
288 if (fClusterPointer[i]) {
289 found++;
290 }
291 else
292 continue;
293
294 if (fClusterPointer[i]->IsUsed(10)) {
295 shared++;
296 continue;
297 }
298 if (!plus2) continue; //take also neighborhoud
299 //
300 if ( (i>0) && fClusterPointer[i-1]){
301 if (fClusterPointer[i-1]->IsUsed(10)) {
302 shared++;
303 continue;
304 }
305 }
306 if ( fClusterPointer[i+1]){
307 if (fClusterPointer[i+1]->IsUsed(10)) {
308 shared++;
309 continue;
310 }
311 }
312
313 }
314 //if (shared>found){
315 //Error("AliTPCseed::GetClusterStatistic","problem\n");
316 //}
317}
318
319
320
321
322
323void AliTPCseed::Reset(Bool_t all)
324{
325 //
326 //
327 SetNumberOfClusters(0);
328 fNFoundable = 0;
329 SetChi2(0);
6c94f330 330 ResetCovariance(10.);
81e97e0d 331 /*
332 if (fTrackPoints){
333 for (Int_t i=0;i<8;i++){
334 delete [] fTrackPoints[i];
335 }
336 delete fTrackPoints;
337 fTrackPoints =0;
338 }
339 */
340
341 if (all){
342 for (Int_t i=0;i<200;i++) SetClusterIndex2(i,-3);
343 for (Int_t i=0;i<160;i++) fClusterPointer[i]=0;
344 }
345
346}
347
348
349void AliTPCseed::Modify(Double_t factor)
350{
351
352 //------------------------------------------------------------------
353 //This function makes a track forget its history :)
354 //------------------------------------------------------------------
355 if (factor<=0) {
6c94f330 356 ResetCovariance(10.);
81e97e0d 357 return;
358 }
6c94f330 359 ResetCovariance(factor);
360
81e97e0d 361 SetNumberOfClusters(0);
362 fNFoundable =0;
363 SetChi2(0);
364 fRemoval = 0;
365 fCurrentSigmaY2 = 0.000005;
366 fCurrentSigmaZ2 = 0.000005;
367 fNoCluster = 0;
368 //fFirstPoint = 160;
369 //fLastPoint = 0;
370}
371
372
373
374
375Int_t AliTPCseed::GetProlongation(Double_t xk, Double_t &y, Double_t & z) const
376{
377 //-----------------------------------------------------------------
378 // This function find proloncation of a track to a reference plane x=xk.
379 // doesn't change internal state of the track
380 //-----------------------------------------------------------------
381
6c94f330 382 Double_t x1=GetX(), x2=x1+(xk-x1), dx=x2-x1;
81e97e0d 383
6c94f330 384 if (TMath::Abs(GetSnp()+GetC()*dx) >= AliTPCReconstructor::GetMaxSnpTrack()) {
81e97e0d 385 return 0;
386 }
387
388 // Double_t y1=fP0, z1=fP1;
6c94f330 389 Double_t c1=GetSnp(), r1=sqrt(1.- c1*c1);
390 Double_t c2=c1 + GetC()*dx, r2=sqrt(1.- c2*c2);
81e97e0d 391
6c94f330 392 y = GetY();
393 z = GetZ();
81e97e0d 394 //y += dx*(c1+c2)/(r1+r2);
395 //z += dx*(c1+c2)/(c1*r2 + c2*r1)*fP3;
396
397 Double_t dy = dx*(c1+c2)/(r1+r2);
398 Double_t dz = 0;
399 //
6c94f330 400 Double_t delta = GetC()*dx*(c1+c2)/(c1*r2 + c2*r1);
81e97e0d 401 /*
402 if (TMath::Abs(delta)>0.0001){
403 dz = fP3*TMath::ASin(delta)/fP4;
404 }else{
405 dz = dx*fP3*(c1+c2)/(c1*r2 + c2*r1);
406 }
407 */
408 // dz = fP3*AliTPCFastMath::FastAsin(delta)/fP4;
6c94f330 409 dz = GetTgl()*TMath::ASin(delta)/GetC();
81e97e0d 410 //
411 y+=dy;
412 z+=dz;
413
414
415 return 1;
416}
417
418
419//_____________________________________________________________________________
af32720d 420Double_t AliTPCseed::GetPredictedChi2(const AliCluster *c) const
81e97e0d 421{
422 //-----------------------------------------------------------------
423 // This function calculates a predicted chi2 increment.
424 //-----------------------------------------------------------------
6c94f330 425 Double_t p[2]={c->GetY(), c->GetZ()};
426 Double_t cov[3]={fErrorY2, 0., fErrorZ2};
427 return AliExternalTrackParam::GetPredictedChi2(p,cov);
81e97e0d 428}
429
81e97e0d 430//_________________________________________________________________________________________
431
432
433Int_t AliTPCseed::Compare(const TObject *o) const {
434 //-----------------------------------------------------------------
435 // This function compares tracks according to the sector - for given sector according z
436 //-----------------------------------------------------------------
437 AliTPCseed *t=(AliTPCseed*)o;
6c94f330 438
81e97e0d 439 if (fSort == 0){
440 if (t->fRelativeSector>fRelativeSector) return -1;
441 if (t->fRelativeSector<fRelativeSector) return 1;
442 Double_t z2 = t->GetZ();
443 Double_t z1 = GetZ();
444 if (z2>z1) return 1;
445 if (z2<z1) return -1;
446 return 0;
447 }
448 else {
449 Float_t f2 =1;
6c94f330 450 f2 = 1-20*TMath::Sqrt(t->GetSigma1Pt2())/(TMath::Abs(t->Get1Pt())+0.0066);
81e97e0d 451 if (t->fBConstrain) f2=1.2;
452
453 Float_t f1 =1;
6c94f330 454 f1 = 1-20*TMath::Sqrt(GetSigma1Pt2())/(TMath::Abs(Get1Pt())+0.0066);
81e97e0d 455
456 if (fBConstrain) f1=1.2;
457
458 if (t->GetNumberOfClusters()*f2 <GetNumberOfClusters()*f1) return -1;
459 else return +1;
460 }
461}
462
463
464
465
466//_____________________________________________________________________________
6c94f330 467Bool_t AliTPCseed::Update(const AliCluster *c, Double_t chisq, Int_t /*index*/)
468{
81e97e0d 469 //-----------------------------------------------------------------
470 // This function associates a cluster with this track.
471 //-----------------------------------------------------------------
6c94f330 472 Double_t p[2]={c->GetY(), c->GetZ()};
473 Double_t cov[3]={fErrorY2, 0., fErrorZ2};
81e97e0d 474
6c94f330 475 if (!AliExternalTrackParam::Update(p,cov)) return kFALSE;
81e97e0d 476
477 Int_t n=GetNumberOfClusters();
478 // fIndex[n]=index;
479 SetNumberOfClusters(n+1);
480 SetChi2(GetChi2()+chisq);
481
6c94f330 482 return kTRUE;
81e97e0d 483}
484
485
486
487//_____________________________________________________________________________
105b1b81 488Float_t AliTPCseed::CookdEdx(Double_t low, Double_t up,Int_t i1, Int_t i2, Bool_t onlyused) {
81e97e0d 489 //-----------------------------------------------------------------
490 // This funtion calculates dE/dX within the "low" and "up" cuts.
491 //-----------------------------------------------------------------
492
493 Float_t amp[200];
494 Float_t angular[200];
495 Float_t weight[200];
496 Int_t index[200];
497 //Int_t nc = 0;
498 // TClonesArray & arr = *fPoints;
499 Float_t meanlog = 100.;
500
501 Float_t mean[4] = {0,0,0,0};
502 Float_t sigma[4] = {1000,1000,1000,1000};
503 Int_t nc[4] = {0,0,0,0};
504 Float_t norm[4] = {1000,1000,1000,1000};
505 //
506 //
507 fNShared =0;
508
509 for (Int_t of =0; of<4; of++){
510 for (Int_t i=of+i1;i<i2;i+=4)
511 {
512 Int_t index = fIndex[i];
513 if (index<0||index&0x8000) continue;
514
515 //AliTPCTrackPoint * point = (AliTPCTrackPoint *) arr.At(i);
516 AliTPCTrackerPoint * point = GetTrackPoint(i);
517 //AliTPCTrackerPoint * pointm = GetTrackPoint(i-1);
518 //AliTPCTrackerPoint * pointp = 0;
519 //if (i<159) pointp = GetTrackPoint(i+1);
520
521 if (point==0) continue;
522 AliTPCclusterMI * cl = fClusterPointer[i];
523 if (cl==0) continue;
524 if (onlyused && (!cl->IsUsed(10))) continue;
525 if (cl->IsUsed(11)) {
526 fNShared++;
527 continue;
528 }
529 Int_t type = cl->GetType();
530 //if (point->fIsShared){
531 // fNShared++;
532 // continue;
533 //}
534 //if (pointm)
535 // if (pointm->fIsShared) continue;
536 //if (pointp)
537 // if (pointp->fIsShared) continue;
538
539 if (type<0) continue;
540 //if (type>10) continue;
541 //if (point->GetErrY()==0) continue;
542 //if (point->GetErrZ()==0) continue;
543
544 //Float_t ddy = (point->GetY()-cl->GetY())/point->GetErrY();
545 //Float_t ddz = (point->GetZ()-cl->GetZ())/point->GetErrZ();
546 //if ((ddy*ddy+ddz*ddz)>10) continue;
547
548
549 // if (point->GetCPoint().GetMax()<5) continue;
550 if (cl->GetMax()<5) continue;
551 Float_t angley = point->GetAngleY();
552 Float_t anglez = point->GetAngleZ();
553
554 Float_t rsigmay2 = point->GetSigmaY();
555 Float_t rsigmaz2 = point->GetSigmaZ();
556 /*
557 Float_t ns = 1.;
558 if (pointm){
559 rsigmay += pointm->GetTPoint().GetSigmaY();
560 rsigmaz += pointm->GetTPoint().GetSigmaZ();
561 ns+=1.;
562 }
563 if (pointp){
564 rsigmay += pointp->GetTPoint().GetSigmaY();
565 rsigmaz += pointp->GetTPoint().GetSigmaZ();
566 ns+=1.;
567 }
568 rsigmay/=ns;
569 rsigmaz/=ns;
570 */
571
572 Float_t rsigma = TMath::Sqrt(rsigmay2*rsigmaz2);
573
574 Float_t ampc = 0; // normalization to the number of electrons
575 if (i>64){
576 // ampc = 1.*point->GetCPoint().GetMax();
577 ampc = 1.*cl->GetMax();
578 //ampc = 1.*point->GetCPoint().GetQ();
579 // AliTPCClusterPoint & p = point->GetCPoint();
580 // Float_t dy = TMath::Abs(Int_t( TMath::Abs(p.GetY()/0.6)) - TMath::Abs(p.GetY()/0.6)+0.5);
581 // Float_t iz = (250.0-TMath::Abs(p.GetZ())+0.11)/0.566;
582 //Float_t dz =
583 // TMath::Abs( Int_t(iz) - iz + 0.5);
584 //ampc *= 1.15*(1-0.3*dy);
585 //ampc *= 1.15*(1-0.3*dz);
586 // Float_t zfactor = (AliTPCReconstructor::GetCtgRange()-0.0004*TMath::Abs(point->GetCPoint().GetZ()));
587 //ampc *=zfactor;
588 }
589 else{
590 //ampc = 1.0*point->GetCPoint().GetMax();
591 ampc = 1.0*cl->GetMax();
592 //ampc = 1.0*point->GetCPoint().GetQ();
593 //AliTPCClusterPoint & p = point->GetCPoint();
594 // Float_t dy = TMath::Abs(Int_t( TMath::Abs(p.GetY()/0.4)) - TMath::Abs(p.GetY()/0.4)+0.5);
595 //Float_t iz = (250.0-TMath::Abs(p.GetZ())+0.11)/0.566;
596 //Float_t dz =
597 // TMath::Abs( Int_t(iz) - iz + 0.5);
598
599 //ampc *= 1.15*(1-0.3*dy);
600 //ampc *= 1.15*(1-0.3*dz);
601 // Float_t zfactor = (1.02-0.000*TMath::Abs(point->GetCPoint().GetZ()));
602 //ampc *=zfactor;
603
604 }
605 ampc *= 2.0; // put mean value to channel 50
606 //ampc *= 0.58; // put mean value to channel 50
607 Float_t w = 1.;
608 // if (type>0) w = 1./(type/2.-0.5);
609 // Float_t z = TMath::Abs(cl->GetZ());
610 if (i<64) {
611 ampc /= 0.6;
612 //ampc /= (1+0.0008*z);
613 } else
614 if (i>128){
615 ampc /=1.5;
616 //ampc /= (1+0.0008*z);
617 }else{
618 //ampc /= (1+0.0008*z);
619 }
620
621 if (type<0) { //amp at the border - lower weight
622 // w*= 2.;
623
624 continue;
625 }
626 if (rsigma>1.5) ampc/=1.3; // if big backround
627 amp[nc[of]] = ampc;
628 angular[nc[of]] = TMath::Sqrt(1.+angley*angley+anglez*anglez);
629 weight[nc[of]] = w;
630 nc[of]++;
631 }
632
633 TMath::Sort(nc[of],amp,index,kFALSE);
634 Float_t sumamp=0;
635 Float_t sumamp2=0;
636 Float_t sumw=0;
637 //meanlog = amp[index[Int_t(nc[of]*0.33)]];
638 meanlog = 50;
639 for (Int_t i=int(nc[of]*low+0.5);i<int(nc[of]*up+0.5);i++){
640 Float_t ampl = amp[index[i]]/angular[index[i]];
641 ampl = meanlog*TMath::Log(1.+ampl/meanlog);
642 //
643 sumw += weight[index[i]];
644 sumamp += weight[index[i]]*ampl;
645 sumamp2 += weight[index[i]]*ampl*ampl;
646 norm[of] += angular[index[i]]*weight[index[i]];
647 }
648 if (sumw<1){
649 SetdEdx(0);
650 }
651 else {
652 norm[of] /= sumw;
653 mean[of] = sumamp/sumw;
654 sigma[of] = sumamp2/sumw-mean[of]*mean[of];
655 if (sigma[of]>0.1)
656 sigma[of] = TMath::Sqrt(sigma[of]);
657 else
658 sigma[of] = 1000;
659
660 mean[of] = (TMath::Exp(mean[of]/meanlog)-1)*meanlog;
661 //mean *=(1-0.02*(sigma/(mean*0.17)-1.));
662 //mean *=(1-0.1*(norm-1.));
663 }
664 }
665
666 Float_t dedx =0;
667 fSdEdx =0;
668 fMAngular =0;
669 // mean[0]*= (1-0.05*(sigma[0]/(0.01+mean[1]*0.18)-1));
670 // mean[1]*= (1-0.05*(sigma[1]/(0.01+mean[0]*0.18)-1));
671
672
673 // dedx = (mean[0]* TMath::Sqrt((1.+nc[0]))+ mean[1]* TMath::Sqrt((1.+nc[1])) )/
674 // ( TMath::Sqrt((1.+nc[0]))+TMath::Sqrt((1.+nc[1])));
675
676 Int_t norm2 = 0;
677 Int_t norm3 = 0;
678 for (Int_t i =0;i<4;i++){
679 if (nc[i]>2&&nc[i]<1000){
680 dedx += mean[i] *nc[i];
681 fSdEdx += sigma[i]*(nc[i]-2);
682 fMAngular += norm[i] *nc[i];
683 norm2 += nc[i];
684 norm3 += nc[i]-2;
685 }
686 fDEDX[i] = mean[i];
687 fSDEDX[i] = sigma[i];
688 fNCDEDX[i]= nc[i];
689 }
690
691 if (norm3>0){
692 dedx /=norm2;
693 fSdEdx /=norm3;
694 fMAngular/=norm2;
695 }
696 else{
697 SetdEdx(0);
105b1b81 698 return 0;
81e97e0d 699 }
700 // Float_t dedx1 =dedx;
701 /*
702 dedx =0;
703 for (Int_t i =0;i<4;i++){
704 if (nc[i]>2&&nc[i]<1000){
705 mean[i] = mean[i]*(1-0.12*(sigma[i]/(fSdEdx)-1.));
706 dedx += mean[i] *nc[i];
707 }
708 fDEDX[i] = mean[i];
709 }
710 dedx /= norm2;
711 */
712
713
714 SetdEdx(dedx);
a2d457f2 715 return dedx;
81e97e0d 716}
717Double_t AliTPCseed::Bethe(Double_t bg){
718 //
719 // This is the Bethe-Bloch function normalised to 1 at the minimum
720 //
721 Double_t bg2=bg*bg;
722 Double_t bethe;
723 if (bg<3.5e1)
724 bethe=(1.+ bg2)/bg2*(log(5940*bg2) - bg2/(1.+ bg2));
725 else // Density effect ( approximately :)
726 bethe=1.15*(1.+ bg2)/bg2*(log(3.5*5940*bg) - bg2/(1.+ bg2));
727 return bethe/11.091;
728}
729
730void AliTPCseed::CookPID()
731{
732 //
733 // cook PID information according dEdx
734 //
735 Double_t fRange = 10.;
736 Double_t fRes = 0.1;
737 Double_t fMIP = 47.;
738 //
739 Int_t ns=AliPID::kSPECIES;
740 Double_t sumr =0;
741 for (Int_t j=0; j<ns; j++) {
742 Double_t mass=AliPID::ParticleMass(j);
6c94f330 743 Double_t mom=GetP();
81e97e0d 744 Double_t dedx=fdEdx/fMIP;
745 Double_t bethe=Bethe(mom/mass);
746 Double_t sigma=fRes*bethe;
747 if (sigma>0.001){
748 if (TMath::Abs(dedx-bethe) > fRange*sigma) {
749 fTPCr[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
750 sumr+=fTPCr[j];
751 continue;
752 }
753 fTPCr[j]=TMath::Exp(-0.5*(dedx-bethe)*(dedx-bethe)/(sigma*sigma))/sigma;
754 sumr+=fTPCr[j];
755 }
756 else{
757 fTPCr[j]=1.;
758 sumr+=fTPCr[j];
759 }
760 }
761 for (Int_t j=0; j<ns; j++) {
762 fTPCr[j]/=sumr; //normalize
763 }
764}
765
766/*
767void AliTPCseed::CookdEdx2(Double_t low, Double_t up) {
768 //-----------------------------------------------------------------
769 // This funtion calculates dE/dX within the "low" and "up" cuts.
770 //-----------------------------------------------------------------
771
772 Float_t amp[200];
773 Float_t angular[200];
774 Float_t weight[200];
775 Int_t index[200];
776 Bool_t inlimit[200];
777 for (Int_t i=0;i<200;i++) inlimit[i]=kFALSE;
778 for (Int_t i=0;i<200;i++) amp[i]=10000;
779 for (Int_t i=0;i<200;i++) angular[i]= 1;;
780
781
782 //
783 Float_t meanlog = 100.;
784 Int_t indexde[4]={0,64,128,160};
785
786 Float_t amean =0;
787 Float_t asigma =0;
788 Float_t anc =0;
789 Float_t anorm =0;
790
791 Float_t mean[4] = {0,0,0,0};
792 Float_t sigma[4] = {1000,1000,1000,1000};
793 Int_t nc[4] = {0,0,0,0};
794 Float_t norm[4] = {1000,1000,1000,1000};
795 //
796 //
797 fNShared =0;
798
799 // for (Int_t of =0; of<3; of++){
800 // for (Int_t i=indexde[of];i<indexde[of+1];i++)
801 for (Int_t i =0; i<160;i++)
802 {
803 AliTPCTrackPoint * point = GetTrackPoint(i);
804 if (point==0) continue;
805 if (point->fIsShared){
806 fNShared++;
807 continue;
808 }
809 Int_t type = point->GetCPoint().GetType();
810 if (type<0) continue;
811 if (point->GetCPoint().GetMax()<5) continue;
812 Float_t angley = point->GetTPoint().GetAngleY();
813 Float_t anglez = point->GetTPoint().GetAngleZ();
814 Float_t rsigmay = point->GetCPoint().GetSigmaY();
815 Float_t rsigmaz = point->GetCPoint().GetSigmaZ();
816 Float_t rsigma = TMath::Sqrt(rsigmay*rsigmaz);
817
818 Float_t ampc = 0; // normalization to the number of electrons
819 if (i>64){
820 ampc = point->GetCPoint().GetMax();
821 }
822 else{
823 ampc = point->GetCPoint().GetMax();
824 }
825 ampc *= 2.0; // put mean value to channel 50
826 // ampc *= 0.565; // put mean value to channel 50
827
828 Float_t w = 1.;
829 Float_t z = TMath::Abs(point->GetCPoint().GetZ());
830 if (i<64) {
831 ampc /= 0.63;
832 } else
833 if (i>128){
834 ampc /=1.51;
835 }
836 if (type<0) { //amp at the border - lower weight
837 continue;
838 }
839 if (rsigma>1.5) ampc/=1.3; // if big backround
840 angular[i] = TMath::Sqrt(1.+angley*angley+anglez*anglez);
841 amp[i] = ampc/angular[i];
842 weight[i] = w;
843 anc++;
844 }
845
846 TMath::Sort(159,amp,index,kFALSE);
847 for (Int_t i=int(anc*low+0.5);i<int(anc*up+0.5);i++){
848 inlimit[index[i]] = kTRUE; // take all clusters
849 }
850
851 // meanlog = amp[index[Int_t(anc*0.3)]];
852 meanlog =10000.;
853 for (Int_t of =0; of<3; of++){
854 Float_t sumamp=0;
855 Float_t sumamp2=0;
856 Float_t sumw=0;
857 for (Int_t i=indexde[of];i<indexde[of+1];i++)
858 {
859 if (inlimit[i]==kFALSE) continue;
860 Float_t ampl = amp[i];
861 ///angular[i];
862 ampl = meanlog*TMath::Log(1.+ampl/meanlog);
863 //
864 sumw += weight[i];
865 sumamp += weight[i]*ampl;
866 sumamp2 += weight[i]*ampl*ampl;
867 norm[of] += angular[i]*weight[i];
868 nc[of]++;
869 }
870 if (sumw<1){
871 SetdEdx(0);
872 }
873 else {
874 norm[of] /= sumw;
875 mean[of] = sumamp/sumw;
876 sigma[of] = sumamp2/sumw-mean[of]*mean[of];
877 if (sigma[of]>0.1)
878 sigma[of] = TMath::Sqrt(sigma[of]);
879 else
880 sigma[of] = 1000;
881 mean[of] = (TMath::Exp(mean[of]/meanlog)-1)*meanlog;
882 }
883 }
884
885 Float_t dedx =0;
886 fSdEdx =0;
887 fMAngular =0;
888 //
889 Int_t norm2 = 0;
890 Int_t norm3 = 0;
891 Float_t www[3] = {12.,14.,17.};
892 //Float_t www[3] = {1.,1.,1.};
893
894 for (Int_t i =0;i<3;i++){
895 if (nc[i]>2&&nc[i]<1000){
896 dedx += mean[i] *nc[i]*www[i]/sigma[i];
897 fSdEdx += sigma[i]*(nc[i]-2)*www[i]/sigma[i];
898 fMAngular += norm[i] *nc[i];
899 norm2 += nc[i]*www[i]/sigma[i];
900 norm3 += (nc[i]-2)*www[i]/sigma[i];
901 }
902 fDEDX[i] = mean[i];
903 fSDEDX[i] = sigma[i];
904 fNCDEDX[i]= nc[i];
905 }
906
907 if (norm3>0){
908 dedx /=norm2;
909 fSdEdx /=norm3;
910 fMAngular/=norm2;
911 }
912 else{
913 SetdEdx(0);
914 return;
915 }
916 // Float_t dedx1 =dedx;
917
918 dedx =0;
919 Float_t norm4 = 0;
920 for (Int_t i =0;i<3;i++){
921 if (nc[i]>2&&nc[i]<1000&&sigma[i]>3){
922 //mean[i] = mean[i]*(1+0.08*(sigma[i]/(fSdEdx)-1.));
923 dedx += mean[i] *(nc[i])/(sigma[i]);
924 norm4 += (nc[i])/(sigma[i]);
925 }
926 fDEDX[i] = mean[i];
927 }
928 if (norm4>0) dedx /= norm4;
929
930
931
932 SetdEdx(dedx);
933
934 //mi deDX
935
936}
937*/
6c94f330 938Double_t AliTPCseed::GetYat(Double_t xk) const {
939//-----------------------------------------------------------------
940// This function calculates the Y-coordinate of a track at the plane x=xk.
941//-----------------------------------------------------------------
942 if (TMath::Abs(GetSnp())>AliTPCReconstructor::GetMaxSnpTrack()) return 0.; //patch 01 jan 06
943 Double_t c1=GetSnp(), r1=TMath::Sqrt(1.- c1*c1);
944 Double_t c2=c1+GetC()*(xk-GetX());
945 if (TMath::Abs(c2)>AliTPCReconstructor::GetMaxSnpTrack()) return 0;
946 Double_t r2=TMath::Sqrt(1.- c2*c2);
947 return GetY() + (xk-GetX())*(c1+c2)/(r1+r2);
948}
949