1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 /* $Id: AliTOFT0v1.cxx,v 1.8 2010/01/19 16:32:20 noferini Exp $ */
18 //_________________________________________________________________________
19 // This is a TTask that made the calculation of the Time zero using TOF.
20 // Description: The algorithm used to calculate the time zero of interaction
21 // using TOF detector is the following.
22 // We select in the ESD some "primary" particles - or tracks in the following -
23 // that strike the TOF detector (the larger part are pions, kaons or protons).
24 // We choose a set of 10 selected tracks, for each track You have the length
25 // of the track when the TOF is reached,
26 // the momentum and the time of flight
27 // given by the TOF detector.
28 // Let consider now only one set of 10 tracks (the algorithm is the same for all sets).
29 // Assuming the (mass) hypothesis that each track can be AUT a pion, AUT a kaon, AUT a proton,
30 // we consider all the 3 at 10 possible cases.
31 // For each track in each (mass) configuration
32 // (a configuration can be e.g. pion/pion/kaon/proton/pion/proton/kaon/kaon/pion/pion)
33 // we calculate the time zero (we know in fact the velocity of the track after
34 // the assumption about its mass, the time of flight given by the TOF, and the
35 // corresponding path travelled till the TOF detector). Then for each mass configuration we have
36 // 10 time zero and we can calculate the ChiSquare for the current configuration using the
37 // weighted mean over all 10 time zero.
38 // We call the best assignment the mass configuration that gives the minimum value of the ChiSquare.
39 // We plot the weighted mean over all 10 time zero for the best assignment,
40 // the ChiSquare for the best assignment and the corresponding confidence level.
41 // The strong assumption is the MC selection of primary particles. It will be introduced
42 // in the future also some more realistic simulation about this point.
44 // root [0] AliTOFT0v1 * tzero = new AliTOFT0v1("galice.root")
45 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
46 // root [1] tzero->ExecuteTask()
47 // root [2] tzero->ExecuteTask("tim")
48 // // available parameters:
49 // tim - print benchmarking information
50 // all - print usefull informations about the number of misidentified tracks
51 // and a comparison about the true configuration (known from MC) and the best
53 // Different Selections for pp and Pb-Pb: Momentum Range, Max Time, # pions
54 //-- Author: F. Pierella
55 //-- Mod By Silvia Arcelli, Francesco Noferini, Barbara Guerzoni
56 //////////////////////////////////////////////////////////////////////////////
58 #include "AliESDtrack.h"
59 #include "AliESDEvent.h"
60 #include "AliTOFT0v1.h"
61 #include "TBenchmark.h"
63 #include "AliESDpid.h"
67 //____________________________________________________________________________
68 AliTOFT0v1::AliTOFT0v1(AliESDpid *extPID):
75 fTracks(new TObjArray(10)),
76 fGTracks(new TObjArray(10)),
77 fTracksT0(new TObjArray(10))
80 // default constructor
82 if(AliPID::ParticleMass(0) == 0) new AliPID();
85 fPIDesd = new AliESDpid();
92 //____________________________________________________________________________
93 AliTOFT0v1::AliTOFT0v1(AliESDEvent* event,AliESDpid *extPID):
100 fTracks(new TObjArray(10)),
101 fGTracks(new TObjArray(10)),
102 fTracksT0(new TObjArray(10))
107 if(AliPID::ParticleMass(0) == 0) new AliPID();
110 fPIDesd = new AliESDpid();
116 //____________________________________________________________________________
117 AliTOFT0v1& AliTOFT0v1::operator=(const AliTOFT0v1 &tzero)
126 fLowerMomBound=tzero.fLowerMomBound;
127 fUpperMomBound=tzero.fUpperMomBound;
128 fTimeCorr=tzero.fTimeCorr;
130 fT0SigmaT0def[0]=tzero.fT0SigmaT0def[0];
131 fT0SigmaT0def[1]=tzero.fT0SigmaT0def[1];
132 fT0SigmaT0def[2]=tzero.fT0SigmaT0def[2];
133 fT0SigmaT0def[3]=tzero.fT0SigmaT0def[3];
135 fTracks=tzero.fTracks;
136 fGTracks=tzero.fGTracks;
137 fTracksT0=tzero.fTracksT0;
139 for (Int_t ii=0; ii<tzero.fTracks->GetEntries(); ii++)
140 fTracks->AddLast(tzero.fTracks->At(ii));
142 for (Int_t ii=0; ii<tzero.fGTracks->GetEntries(); ii++)
143 fGTracks->AddLast(tzero.fGTracks->At(ii));
145 for (Int_t ii=0; ii<tzero.fTracksT0->GetEntries(); ii++)
146 fTracksT0->AddLast(tzero.fTracksT0->At(ii));
151 //____________________________________________________________________________
152 AliTOFT0v1::~AliTOFT0v1()
170 //____________________________________________________________________________
173 AliTOFT0v1::Init(AliESDEvent *event)
182 fT0SigmaT0def[1]=0.6;
188 //____________________________________________________________________________
189 Double_t * AliTOFT0v1::DefineT0(Option_t *option)
191 // Caluclate the Event Time using the ESD TOF time
193 TBenchmark *bench=new TBenchmark();
194 bench->Start("t0computation");
197 fT0SigmaT0def[1]=0.600;
201 const Int_t nmaxtracksinsetMax=10;
202 Int_t nmaxtracksinset=10;
203 // if(strstr(option,"all")){
204 // cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl;
205 // cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl;
210 Int_t ngoodsetsSel= 0;
211 Float_t t0bestSel[300];
212 Float_t eT0bestSel[300];
213 Float_t chiSquarebestSel[300];
214 Float_t confLevelbestSel[300];
215 Float_t t0bestallSel=0.;
216 Float_t eT0bestallSel=0.;
217 Float_t sumWt0bestallSel=0.;
218 Float_t eMeanTzeroPi=0.;
219 Float_t meantzeropi=0.;
220 Float_t sumAllweightspi=0.;
222 Double_t deltat0def=999;
223 Int_t ngoodtrktrulyused=0;
224 Int_t ntracksinsetmyCut = 0;
226 Int_t ntrk=fEvent->GetNumberOfTracks();
228 //AliESDtrack **fTracks=new AliESDtrack*[ntrk];
231 Float_t mintime =1E6;
233 // First Track loop, Selection of good tracks
235 for (Int_t itrk=0; itrk<ntrk; itrk++) {
236 AliESDtrack *t=fEvent->GetTrack(itrk);
237 Double_t momOld=t->GetP();
238 Double_t mom=momOld-0.0036*momOld;
239 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
240 if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
241 Double_t time=t->GetTOFsignal();
243 time*=1.E-3; // tof given in nanoseconds
244 if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue;
246 if (!AcceptTrack(t)) continue;
248 if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays
250 if(time <= mintime) mintime=time;
251 //fTracks[ngoodtrk]=t;
256 if(ngoodtrk>22) nmaxtracksinset = 6;
258 // cout << " N. of ESD tracks : " << ntrk << endl;
259 // cout << " N. of preselected tracks : " << ngoodtrk << endl;
260 // cout << " Minimum tof time in set (in ns) : " << mintime << endl;
262 //AliESDtrack **fGTracks=new AliESDtrack*[ngoodtrk];
264 //for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) {
265 for (Int_t jtrk=0; jtrk< fTracks->GetEntries(); jtrk++) {
266 //AliESDtrack *t=fTracks[jtrk];
267 AliESDtrack *t=(AliESDtrack*)fTracks->At(jtrk);
268 Double_t time=t->GetTOFsignal();
270 if((time-mintime*1.E3)<50.E3){ // For pp and per
271 //fGTracks[ngoodtrkt0]=t;
272 fGTracks->AddLast(t);
280 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
281 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
282 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
285 // cout << "less than 2 tracks, skip event " << endl;
288 fT0SigmaT0def[0]=t0def;
289 fT0SigmaT0def[1]=deltat0def;
290 fT0SigmaT0def[2]=ngoodtrkt0;
291 fT0SigmaT0def[3]=ngoodtrkt0;
295 // Decide how many tracks in set
296 Int_t ntracksinset = std::min(ngoodtrkt0,nmaxtracksinsetCurrent);
299 if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
301 // Loop over selected sets
304 for (Int_t i=0; i< nset; i++) {
307 Float_t eT0best=999.;
308 Float_t chisquarebest=99999.;
311 Int_t ntracksinsetmy=0;
312 //AliESDtrack **fTracksT0=new AliESDtrack*[ntracksinset];
313 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
314 Int_t index = itrk+i*ntracksinset;
315 //if(index < ngoodtrkt0){
316 if(index < fGTracks->GetEntries()){
317 //AliESDtrack *t=fGTracks[index];
318 AliESDtrack *t=(AliESDtrack*)fGTracks->At(index);
320 fTracksT0->AddLast(t);
327 Int_t assparticle[nmaxtracksinsetMax];
328 Float_t exptof[nmaxtracksinsetMax][3];
329 Float_t timeofflight[nmaxtracksinsetMax];
330 Float_t momentum[nmaxtracksinsetMax];
331 Float_t timezero[nmaxtracksinsetMax];
332 Float_t weightedtimezero[nmaxtracksinsetMax];
333 Float_t beta[nmaxtracksinsetMax];
334 Float_t texp[nmaxtracksinsetMax];
335 Float_t dtexp[nmaxtracksinsetMax];
336 Float_t sqMomError[nmaxtracksinsetMax];
337 Float_t sqTrackError[nmaxtracksinsetMax];
338 Float_t massarray[3]={0.13957,0.493677,0.9382723};
339 Float_t tracktoflen[nmaxtracksinsetMax];
340 Float_t besttimezero[nmaxtracksinsetMax];
341 Float_t besttexp[nmaxtracksinsetMax];
342 Float_t besttimeofflight[nmaxtracksinsetMax];
343 Float_t bestmomentum[nmaxtracksinsetMax];
344 Float_t bestchisquare[nmaxtracksinsetMax];
345 Float_t bestweightedtimezero[nmaxtracksinsetMax];
346 Float_t bestsqTrackError[nmaxtracksinsetMax];
347 Int_t imass[nmaxtracksinsetMax];
349 for (Int_t j=0; j<ntracksinset; j++) {
354 weightedtimezero[j] = 0;
363 besttimeofflight[j] = 0;
365 bestchisquare[j] = 0;
366 bestweightedtimezero[j] = 0;
367 bestsqTrackError[j] = 0;
371 //for (Int_t j=0; j<ntracksinsetmy; j++) {
372 for (Int_t j=0; j<fTracksT0->GetEntries(); j++) {
373 //AliESDtrack *t=fTracksT0[j];
374 AliESDtrack *t=(AliESDtrack*)fTracksT0->At(j);
375 Double_t momOld=t->GetP();
376 Double_t mom=momOld-0.0036*momOld;
377 Double_t time=t->GetTOFsignal();
379 time*=1.E-3; // tof given in nanoseconds
380 Double_t exptime[10]; t->GetIntegratedTimes(exptime);
381 Double_t toflen=t->GetIntegratedLength();
382 toflen=toflen/100.; // toflen given in m
384 timeofflight[j]=time;
385 tracktoflen[j]=toflen;
386 exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns
387 exptof[j][1]=exptime[3]*1.E-3+fTimeCorr;
388 exptof[j][2]=exptime[4]*1.E-3+fTimeCorr;
392 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
394 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
395 beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0]
396 +momentum[itz]*momentum[itz]);
397 sqMomError[itz]= ((1.-beta[itz]*beta[itz])*0.01)*((1.-beta[itz]*beta[itz])*0.01)*(tracktoflen[itz]/(0.299792*beta[itz]))*(tracktoflen[itz]/(0.299792*beta[itz]));
398 sqTrackError[itz]=sqMomError[itz]; //in ns
399 timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns
400 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
401 sumAllweightspi+=1./sqTrackError[itz];
402 meantzeropi+=weightedtimezero[itz];
403 } // end loop for (Int_t itz=0; itz< ntracksinset;itz++)
406 // Then, Combinatorial Algorithm
408 if(ntracksinsetmy<2 )break;
410 for (Int_t j=0; j<ntracksinsetmy; j++) {
414 //Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
415 Int_t ncombinatorial = ToCalculatePower(3,ntracksinsetmy);
417 // Loop on mass hypotheses
418 for (Int_t k=0; k < ncombinatorial;k++) {
419 for (Int_t j=0; j<ntracksinsetmy; j++) {
420 //imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1));
421 imass[j] = (k % ToCalculatePower(3,ntracksinsetmy-j))/ToCalculatePower(3,ntracksinsetmy-j-1);
422 texp[j]=exptof[j][imass[j]];
423 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
424 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
427 Float_t sumAllweights=0.;
428 Float_t meantzero=0.;
429 Float_t eMeanTzero=0.;
431 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
432 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
434 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
436 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
437 sumAllweights+=1./sqTrackError[itz];
438 meantzero+=weightedtimezero[itz];
440 } // end loop for (Int_t itz=0; itz<15;itz++)
442 meantzero=meantzero/sumAllweights; // it is given in [ns]
443 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
445 // calculate chisquare
447 Float_t chisquare=0.;
448 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
449 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
450 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(icsq),imass[icsq])) chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; // require TPC agreement
451 // else chisquare+=1000;
452 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
454 if(chisquare<=chisquarebest){
455 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
457 bestsqTrackError[iqsq]=sqTrackError[iqsq];
458 besttimezero[iqsq]=timezero[iqsq];
459 bestmomentum[iqsq]=momentum[iqsq];
460 besttimeofflight[iqsq]=timeofflight[iqsq];
461 besttexp[iqsq]=texp[iqsq];
462 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
463 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
464 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(iqsq),imass[iqsq])) bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; // require TPC agreement
465 // else bestchisquare[iqsq]=1000;
469 for (Int_t j=0; j<ntracksinsetmy; j++) {
470 assparticle[j]=imass[j];
471 if(imass[j] == 0) npion++;
474 chisquarebest=chisquare;
477 } // close if(dummychisquare<=chisquare)
481 Double_t chi2cut[nmaxtracksinsetMax];
483 chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01
484 for (Int_t j=2; j<ntracksinset; j++) {
485 chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.);
488 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
490 // printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
492 Bool_t kRedoT0 = kFALSE;
493 ntracksinsetmyCut = ntracksinsetmy;
494 Bool_t usetrack[nmaxtracksinsetMax];
495 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
496 usetrack[icsq] = kTRUE;
497 if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){
500 usetrack[icsq] = kFALSE;
502 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
504 // printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
506 // Loop on mass hypotheses Redo
507 if(kRedoT0 && ntracksinsetmyCut > 1){
508 // printf("Redo T0\n");
509 for (Int_t k=0; k < ncombinatorial;k++) {
510 for (Int_t j=0; j<ntracksinsetmy; j++) {
511 //imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1));
512 imass[j] = (k % ToCalculatePower(3,ntracksinsetmy-j)) / ToCalculatePower(3,ntracksinsetmy-j-1);
513 texp[j]=exptof[j][imass[j]];
514 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
515 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
518 Float_t sumAllweights=0.;
519 Float_t meantzero=0.;
520 Float_t eMeanTzero=0.;
522 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
523 if(! usetrack[itz]) continue;
524 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
526 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
528 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
529 sumAllweights+=1./sqTrackError[itz];
530 meantzero+=weightedtimezero[itz];
532 } // end loop for (Int_t itz=0; itz<15;itz++)
534 meantzero=meantzero/sumAllweights; // it is given in [ns]
535 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
537 // calculate chisquare
539 Float_t chisquare=0.;
540 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
541 if(! usetrack[icsq]) continue;
542 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
543 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(icsq),imass[icsq])) chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; // require TPC agreement
544 // else chisquare+=1000;
545 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
548 for (Int_t j=0; j<ntracksinsetmy; j++) {
549 assparticle[j]=imass[j];
550 if(imass[j] == 0) npion++;
553 if(chisquare<=chisquarebest && npion>0){
554 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
555 if(! usetrack[iqsq]) continue;
556 bestsqTrackError[iqsq]=sqTrackError[iqsq];
557 besttimezero[iqsq]=timezero[iqsq];
558 bestmomentum[iqsq]=momentum[iqsq];
559 besttimeofflight[iqsq]=timeofflight[iqsq];
560 besttexp[iqsq]=texp[iqsq];
561 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
562 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
563 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(iqsq),imass[iqsq])) bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; // require TPC agreement
564 // else bestchisquare[iqsq]=1000;
568 chisquarebest=chisquare;
571 } // close if(dummychisquare<=chisquare)
577 Float_t confLevel=999;
579 // Sets with decent chisquares
581 if(chisquarebest<999.){
582 Double_t dblechisquare=(Double_t)chisquarebest;
583 confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1);
584 // cout << " Set Number " << nsets << endl;
585 // cout << "Best Assignment, selection " << assparticle[0] <<
586 // assparticle[1] << assparticle[2] <<
587 // assparticle[3] << assparticle[4] <<
588 // assparticle[5] << endl;
589 // cout << " Chisquare of the set "<< chisquarebest <<endl;
590 // cout << " C.L. of the set "<< confLevel <<endl;
591 // cout << " T0 for this set (in ns) " << t0best << endl;
593 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
595 if(! usetrack[icsq]) continue;
597 // cout << "Track # " << icsq << " T0 offsets = "
598 // << besttimezero[icsq]-t0best <<
599 // " track error = " << bestsqTrackError[icsq]
600 // << " Chisquare = " << bestchisquare[icsq]
601 // << " Momentum = " << bestmomentum[icsq]
602 // << " TOF = " << besttimeofflight[icsq]
603 // << " TOF tracking = " << besttexp[icsq]
604 // << " is used = " << usetrack[icsq] << endl;
607 // Pick up only those with C.L. >1%
608 // if(confLevel>0.01 && ngoodsetsSel<200){
609 if(confLevel>0.01 && ngoodsetsSel<200){
610 chiSquarebestSel[ngoodsetsSel]=chisquarebest;
611 confLevelbestSel[ngoodsetsSel]=confLevel;
612 t0bestSel[ngoodsetsSel]=t0best/eT0best/eT0best;
613 eT0bestSel[ngoodsetsSel]=1./eT0best/eT0best;
614 t0bestallSel += t0best/eT0best/eT0best;
615 sumWt0bestallSel += 1./eT0best/eT0best;
617 ngoodtrktrulyused+=ntracksinsetmyCut;
619 // printf("t0 of a set = %f +/- %f\n",t0best,eT0best);
622 // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
625 //delete[] fTracksT0;
629 } // end for the current set
631 //Redo the computation of the best in order to esclude very bad samples
632 if(ngoodsetsSel > 1){
633 Double_t t0BestStep1 = t0bestallSel/sumWt0bestallSel;
634 Int_t nsamples=ngoodsetsSel;
638 for (Int_t itz=0; itz<nsamples;itz++) {
639 if(TMath::Abs(t0bestSel[itz]/eT0bestSel[itz]-t0BestStep1)<1.0){
640 t0bestallSel += t0bestSel[itz];
641 sumWt0bestallSel += eT0bestSel[itz];
643 // printf("not rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
646 // printf("rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
650 if(ngoodsetsSel < 1){
651 sumWt0bestallSel = 0.0;
653 //--------------------------------End recomputation
655 nUsedTracks = ngoodtrkt0;
656 if(strstr(option,"all")){
657 if(sumAllweightspi>0.){
658 meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns]
659 eMeanTzeroPi=sqrt(1./sumAllweightspi); // it is given in [ns]
662 if(sumWt0bestallSel>0){
663 t0bestallSel = t0bestallSel/sumWt0bestallSel;
664 eT0bestallSel = sqrt(1./sumWt0bestallSel);
666 }// end of if(sumWt0bestallSel>0){
668 // cout << "T0 all " << t0bestallSel << " +/- " << eT0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
672 deltat0def=eT0bestallSel;
674 fT0SigmaT0def[0]=t0def;
675 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def);//*ngoodtrktrulyused/(ngoodtrktrulyused-1));
676 fT0SigmaT0def[2]=ngoodtrkt0;
677 fT0SigmaT0def[3]=ngoodtrktrulyused;
681 //delete [] fGTracks;
684 // if(strstr(option,"tim") || strstr(option,"all")){
685 // cout << "AliTOFT0v1:" << endl ;
688 if(fT0SigmaT0def[1] < 0.00001) fT0SigmaT0def[1] = 0.6;
690 bench->Stop("t0computation");
692 fT0SigmaT0def[4]=bench->GetRealTime("t0computation");
693 fT0SigmaT0def[5]=bench->GetCpuTime("t0computation");
695 // bench->Print("t0computation");
696 // printf("%f %f\n",fT0SigmaT0def[4],fT0SigmaT0def[5]);
702 return fT0SigmaT0def;
704 //__________________________________________________________________
705 Double_t * AliTOFT0v1::DefineT0(Option_t *option,Float_t pMinCut,Float_t pMaxCut)
707 TBenchmark *bench=new TBenchmark();
708 bench->Start("t0computation");
710 // Caluclate the Event Time using the ESD TOF time
713 fT0SigmaT0def[1]=0.600;
717 const Int_t nmaxtracksinsetMax=10;
718 Int_t nmaxtracksinset=10;
719 // if(strstr(option,"all")){
720 // cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl;
721 // cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl;
727 Int_t ngoodsetsSel= 0;
728 Float_t t0bestSel[300];
729 Float_t eT0bestSel[300];
730 Float_t chiSquarebestSel[300];
731 Float_t confLevelbestSel[300];
732 Float_t t0bestallSel=0.;
733 Float_t eT0bestallSel=0.;
734 Float_t sumWt0bestallSel=0.;
735 Float_t eMeanTzeroPi=0.;
736 Float_t meantzeropi=0.;
737 Float_t sumAllweightspi=0.;
739 Double_t deltat0def=999;
740 Int_t ngoodtrktrulyused=0;
741 Int_t ntracksinsetmyCut = 0;
743 Int_t ntrk=fEvent->GetNumberOfTracks();
745 //AliESDtrack **fTracks=new AliESDtrack*[ntrk];
748 Float_t mintime =1E6;
750 // First Track loop, Selection of good tracks
753 for (Int_t itrk=0; itrk<ntrk; itrk++) {
754 AliESDtrack *t=fEvent->GetTrack(itrk);
755 Double_t momOld=t->GetP();
756 Double_t mom=momOld-0.0036*momOld;
757 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
758 if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
759 Double_t time=t->GetTOFsignal();
761 time*=1.E-3; // tof given in nanoseconds
762 if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue;
764 if (!AcceptTrack(t)) continue;
766 if(t->GetIntegratedLength() < 350)continue; //skip decays
767 if(t->GetP() > pMinCut && t->GetP() < pMaxCut) continue;
768 if(time <= mintime) mintime=time;
769 //fTracks[ngoodtrk]=t;
774 if(ngoodtrk>22) nmaxtracksinset = 6;
777 // cout << " N. of ESD tracks : " << ntrk << endl;
778 // cout << " N. of preselected tracks : " << ngoodtrk << endl;
779 // cout << " Minimum tof time in set (in ns) : " << mintime << endl;
781 //AliESDtrack **fGTracks=new AliESDtrack*[ngoodtrk];
784 //for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) {
785 for (Int_t jtrk=0; jtrk< fTracks->GetEntries(); jtrk++) {
786 //AliESDtrack *t=fTracks[jtrk];
787 AliESDtrack *t=(AliESDtrack*)fTracks->At(jtrk);
788 Double_t time=t->GetTOFsignal();
790 if((time-mintime*1.E3)<50.E3){ // For pp and per
791 //fGTracks[ngoodtrkt0]=t;
792 fGTracks->AddLast(t);
800 // cout << " N. of preselected tracks t0 : " << ngoodtrkt0 << endl;
802 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
803 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
804 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
806 // cout << " N. of sets : " << nseteq << endl;
809 // cout << "less than 2 tracks, skip event " << endl;
812 fT0SigmaT0def[0]=t0def;
813 fT0SigmaT0def[1]=deltat0def;
814 fT0SigmaT0def[2]=ngoodtrkt0;
815 fT0SigmaT0def[3]=ngoodtrkt0;
819 // Decide how many tracks in set
820 Int_t ntracksinset = std::min(ngoodtrkt0,nmaxtracksinsetCurrent);
823 if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
825 // Loop over selected sets
828 for (Int_t i=0; i< nset; i++) {
829 // printf("Set %i of %i\n",i+1,nset);
831 Float_t eT0best=999.;
832 Float_t chisquarebest=99999.;
836 Int_t ntracksinsetmy=0;
837 //AliESDtrack **fTracksT0=new AliESDtrack*[ntracksinset];
838 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
839 Int_t index = itrk+i*ntracksinset;
840 //if(index < ngoodtrkt0){
841 if(index < fGTracks->GetEntries()){
842 //AliESDtrack *t=fGTracks[index];
843 AliESDtrack *t=(AliESDtrack*)fGTracks->At(index);
845 fTracksT0->AddLast(t);
852 Int_t assparticle[nmaxtracksinsetMax];
853 Float_t exptof[nmaxtracksinsetMax][3];
854 Float_t timeofflight[nmaxtracksinsetMax];
855 Float_t momentum[nmaxtracksinsetMax];
856 Float_t timezero[nmaxtracksinsetMax];
857 Float_t weightedtimezero[nmaxtracksinsetMax];
858 Float_t beta[nmaxtracksinsetMax];
859 Float_t texp[nmaxtracksinsetMax];
860 Float_t dtexp[nmaxtracksinsetMax];
861 Float_t sqMomError[nmaxtracksinsetMax];
862 Float_t sqTrackError[nmaxtracksinsetMax];
863 Float_t massarray[3]={0.13957,0.493677,0.9382723};
864 Float_t tracktoflen[nmaxtracksinsetMax];
865 Float_t besttimezero[nmaxtracksinsetMax];
866 Float_t besttexp[nmaxtracksinsetMax];
867 Float_t besttimeofflight[nmaxtracksinsetMax];
868 Float_t bestmomentum[nmaxtracksinsetMax];
869 Float_t bestchisquare[nmaxtracksinsetMax];
870 Float_t bestweightedtimezero[nmaxtracksinsetMax];
871 Float_t bestsqTrackError[nmaxtracksinsetMax];
872 Int_t imass[nmaxtracksinsetMax];
874 for (Int_t j=0; j<ntracksinset; j++) {
879 weightedtimezero[j] = 0;
888 besttimeofflight[j] = 0;
890 bestchisquare[j] = 0;
891 bestweightedtimezero[j] = 0;
892 bestsqTrackError[j] = 0;
896 //for (Int_t j=0; j<ntracksinsetmy; j++) {
897 for (Int_t j=0; j<fTracksT0->GetEntries(); j++) {
898 //AliESDtrack *t=fTracksT0[j];
899 AliESDtrack *t=(AliESDtrack*)fTracksT0->At(j);
900 Double_t momOld=t->GetP();
901 Double_t mom=momOld-0.0036*momOld;
902 Double_t time=t->GetTOFsignal();
904 time*=1.E-3; // tof given in nanoseconds
905 Double_t exptime[10]; t->GetIntegratedTimes(exptime);
906 Double_t toflen=t->GetIntegratedLength();
907 toflen=toflen/100.; // toflen given in m
909 timeofflight[j]=time;
910 tracktoflen[j]=toflen;
911 exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns
912 exptof[j][1]=exptime[3]*1.E-3+fTimeCorr;
913 exptof[j][2]=exptime[4]*1.E-3+fTimeCorr;
917 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
919 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
920 beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0]
921 +momentum[itz]*momentum[itz]);
922 sqMomError[itz]= ((1.-beta[itz]*beta[itz])*0.01)*((1.-beta[itz]*beta[itz])*0.01)*(tracktoflen[itz]/(0.299792*beta[itz]))*(tracktoflen[itz]/(0.299792*beta[itz]));
923 sqTrackError[itz]=sqMomError[itz]; //in ns
924 timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns
925 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
926 sumAllweightspi+=1./sqTrackError[itz];
927 meantzeropi+=weightedtimezero[itz];
928 } // end loop for (Int_t itz=0; itz< ntracksinset;itz++)
931 // Then, Combinatorial Algorithm
933 if(ntracksinsetmy<2 )break;
935 for (Int_t j=0; j<ntracksinsetmy; j++) {
939 //Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
940 Int_t ncombinatorial = ToCalculatePower(3,ntracksinsetmy);
942 // Loop on mass hypotheses
943 for (Int_t k=0; k < ncombinatorial;k++) {
944 for (Int_t j=0; j<ntracksinsetmy; j++) {
945 //imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1));
946 imass[j] = (k % ToCalculatePower(3,ntracksinsetmy-j))/ToCalculatePower(3,ntracksinsetmy-j-1);
947 texp[j]=exptof[j][imass[j]];
948 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
949 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
952 Float_t sumAllweights=0.;
953 Float_t meantzero=0.;
954 Float_t eMeanTzero=0.;
956 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
957 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
959 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
961 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
962 sumAllweights+=1./sqTrackError[itz];
963 meantzero+=weightedtimezero[itz];
965 } // end loop for (Int_t itz=0; itz<15;itz++)
967 meantzero=meantzero/sumAllweights; // it is given in [ns]
968 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
970 // calculate chisquare
971 Float_t chisquare=0.;
972 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
973 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
974 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(icsq),imass[icsq])) chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; // require TPC agreement
975 // else chisquare+=1000;
976 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
978 if(chisquare<=chisquarebest){
979 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
981 bestsqTrackError[iqsq]=sqTrackError[iqsq];
982 besttimezero[iqsq]=timezero[iqsq];
983 bestmomentum[iqsq]=momentum[iqsq];
984 besttimeofflight[iqsq]=timeofflight[iqsq];
985 besttexp[iqsq]=texp[iqsq];
986 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
987 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
988 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(iqsq),imass[iqsq])) bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; // require TPC agreement
989 // else bestchisquare[iqsq]=1000;
993 for (Int_t j=0; j<ntracksinsetmy; j++) {
994 assparticle[j]=imass[j];
995 if(imass[j] == 0) npion++;
998 chisquarebest=chisquare;
1001 } // close if(dummychisquare<=chisquare)
1004 Double_t chi2cut[nmaxtracksinsetMax];
1006 chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01
1007 for (Int_t j=2; j<ntracksinset; j++) {
1008 chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.);
1011 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
1013 // printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
1015 Bool_t kRedoT0 = kFALSE;
1016 ntracksinsetmyCut = ntracksinsetmy;
1017 Bool_t usetrack[nmaxtracksinsetMax];
1018 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
1019 usetrack[icsq] = kTRUE;
1020 if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){
1022 ntracksinsetmyCut--;
1023 usetrack[icsq] = kFALSE;
1025 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
1027 // printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
1029 // Loop on mass hypotheses Redo
1030 if(kRedoT0 && ntracksinsetmyCut > 1){
1031 // printf("Redo T0\n");
1032 for (Int_t k=0; k < ncombinatorial;k++) {
1033 for (Int_t j=0; j<ntracksinsetmy; j++) {
1034 //imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1));
1035 imass[j] = (k % ToCalculatePower(3,ntracksinsetmy-j)) / ToCalculatePower(3,ntracksinsetmy-j-1);
1036 texp[j]=exptof[j][imass[j]];
1037 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
1038 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
1041 Float_t sumAllweights=0.;
1042 Float_t meantzero=0.;
1043 Float_t eMeanTzero=0.;
1045 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
1046 if(! usetrack[itz]) continue;
1047 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
1049 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
1051 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
1052 sumAllweights+=1./sqTrackError[itz];
1053 meantzero+=weightedtimezero[itz];
1055 } // end loop for (Int_t itz=0; itz<15;itz++)
1057 meantzero=meantzero/sumAllweights; // it is given in [ns]
1058 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
1060 // calculate chisquare
1062 Float_t chisquare=0.;
1063 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
1064 if(! usetrack[icsq]) continue;
1065 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
1066 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(icsq),imass[icsq])) chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; // require TPC agreement
1067 // else chisquare+=1000;
1068 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
1071 for (Int_t j=0; j<ntracksinsetmy; j++) {
1072 assparticle[j]=imass[j];
1073 if(imass[j] == 0) npion++;
1076 if(chisquare<=chisquarebest && npion>0){
1077 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
1078 if(! usetrack[iqsq]) continue;
1079 bestsqTrackError[iqsq]=sqTrackError[iqsq];
1080 besttimezero[iqsq]=timezero[iqsq];
1081 bestmomentum[iqsq]=momentum[iqsq];
1082 besttimeofflight[iqsq]=timeofflight[iqsq];
1083 besttexp[iqsq]=texp[iqsq];
1084 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
1085 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
1086 // if(CheckTPCMatching((AliESDtrack*)fTracksT0->At(iqsq),imass[iqsq])) bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; // require TPC agreement
1087 // else bestchisquare[iqsq]=1000;
1091 chisquarebest=chisquare;
1094 } // close if(dummychisquare<=chisquare)
1100 Float_t confLevel=999;
1102 // Sets with decent chisquares
1103 // printf("Chi2best of the set = %f \n",chisquarebest);
1105 if(chisquarebest<999.){
1106 Double_t dblechisquare=(Double_t)chisquarebest;
1107 confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1);
1108 // cout << " Set Number " << nsets << endl;
1109 // cout << "Best Assignment, selection " << assparticle[0] <<
1110 // assparticle[1] << assparticle[2] <<
1111 // assparticle[3] << assparticle[4] <<
1112 // assparticle[5] << endl;
1113 // cout << " Chisquare of the set "<< chisquarebest <<endl;
1114 // cout << " C.L. of the set "<< confLevel <<endl;
1115 // cout << " T0 for this set (in ns) " << t0best << endl;
1117 Int_t ntrackincurrentsel=0;
1118 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
1120 if(! usetrack[icsq]) continue;
1122 // cout << "Track # " << icsq << " T0 offsets = "
1123 // << besttimezero[icsq]-t0best <<
1124 // " track error = " << bestsqTrackError[icsq]
1125 // << " Chisquare = " << bestchisquare[icsq]
1126 // << " Momentum = " << bestmomentum[icsq]
1127 // << " TOF = " << besttimeofflight[icsq]
1128 // << " TOF tracking = " << besttexp[icsq]
1129 // << " is used = " << usetrack[icsq] << endl;
1130 ntrackincurrentsel++;
1133 // printf("%i) CL(Chi2) = %f < 0.01\n",ngoodsetsSel,confLevel);
1135 // Pick up only those with C.L. >1%
1136 // if(confLevel>0.01 && ngoodsetsSel<200){
1137 if(confLevel>0.01 && ngoodsetsSel<200){
1138 chiSquarebestSel[ngoodsetsSel]=chisquarebest;
1139 confLevelbestSel[ngoodsetsSel]=confLevel;
1140 t0bestSel[ngoodsetsSel]=t0best/eT0best/eT0best;
1141 eT0bestSel[ngoodsetsSel]=1./eT0best/eT0best;
1142 t0bestallSel += t0best/eT0best/eT0best;
1143 sumWt0bestallSel += 1./eT0best/eT0best;
1145 ngoodtrktrulyused+=ntracksinsetmyCut;
1146 // printf("T0best = %f +/- %f (%i-%i) -- conflevel = %f\n",t0best,eT0best,ntrackincurrentsel,npionbest,confLevel);
1149 // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
1152 //delete[] fTracksT0;
1156 } // end for the current set
1158 //Redo the computation of the best in order to esclude very bad samples
1159 if(ngoodsetsSel > 1){
1160 Double_t t0BestStep1 = t0bestallSel/sumWt0bestallSel;
1161 Int_t nsamples=ngoodsetsSel;
1165 for (Int_t itz=0; itz<nsamples;itz++) {
1166 if(TMath::Abs(t0bestSel[itz]/eT0bestSel[itz]-t0BestStep1)<1.0){
1167 t0bestallSel += t0bestSel[itz];
1168 sumWt0bestallSel += eT0bestSel[itz];
1170 // printf("not rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
1173 // printf("rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
1177 if(ngoodsetsSel < 1){
1178 sumWt0bestallSel = 0.0;
1180 //--------------------------------End recomputation
1182 nUsedTracks = ngoodtrkt0;
1183 if(strstr(option,"all")){
1184 if(sumAllweightspi>0.){
1185 meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns]
1186 eMeanTzeroPi=sqrt(1./sumAllweightspi); // it is given in [ns]
1189 // printf("t0bestallSel = %f -- eT0bestallSel = %f\n",t0bestallSel,sumWt0bestallSel);
1191 if(sumWt0bestallSel>0){
1192 t0bestallSel = t0bestallSel/sumWt0bestallSel;
1193 eT0bestallSel = sqrt(1./sumWt0bestallSel);
1194 // printf("Final) t0bestallSel = %f -- eT0bestallSel = %f\n",t0bestallSel,eT0bestallSel);
1195 }// end of if(sumWt0bestallSel>0){
1197 // cout << "T0 all " << t0bestallSel << " +/- " << eT0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
1201 deltat0def=eT0bestallSel;
1203 fT0SigmaT0def[0]=t0def;
1204 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def);//*ngoodtrktrulyused/(ngoodtrktrulyused-1));
1205 fT0SigmaT0def[2]=ngoodtrkt0;
1206 fT0SigmaT0def[3]=ngoodtrktrulyused;
1210 //delete [] fGTracks;
1213 // if(strstr(option,"tim") || strstr(option,"all")){
1214 // cout << "AliTOFT0v1:" << endl ;
1217 if(fT0SigmaT0def[1] < 0.00001) fT0SigmaT0def[1] = 0.6;
1219 bench->Stop("t0computation");
1221 fT0SigmaT0def[4]=bench->GetRealTime("t0computation");
1222 fT0SigmaT0def[5]=bench->GetCpuTime("t0computation");
1224 // bench->Print("t0computation");
1225 // printf("(%4.1f < p < %4.1f GeV/c) T0-TOF =%9.1f +/- %5.1f ps (n_track = %i)\n\n",pMinCut,pMaxCut,-fT0SigmaT0def[0]*1000,fT0SigmaT0def[1]*1000,Int_t(fT0SigmaT0def[3]));
1230 return fT0SigmaT0def;
1232 //__________________________________________________________________
1233 Float_t AliTOFT0v1::GetMomError(Int_t index, Float_t mom, Float_t texp) const
1235 // Take the error extimate for the TOF time in the track reconstruction
1237 static const Double_t kMasses[]={
1238 0.000511, 0.105658, 0.139570, 0.493677, 0.938272, 1.875613
1241 Double_t mass=kMasses[index+2];
1243 Float_t sigma = fPIDesd->GetTOFResponse().GetExpectedSigma(mom,texp,mass);
1248 //__________________________________________________________________
1249 Bool_t AliTOFT0v1::AcceptTrack(AliESDtrack *track)
1253 if (!(track->GetStatus() & AliESDtrack::kTPCrefit)) return kFALSE;
1254 /* do not accept kink daughters */
1255 if (track->GetKinkIndex(0)>0) return kFALSE;
1256 /* N clusters TPC */
1257 if (track->GetTPCclusters(0) < 50) return kFALSE;
1259 if (track->GetTPCchi2()/Float_t(track->GetTPCclusters(0)) > 3.5) return kFALSE;
1260 /* sigma to vertex */
1261 if (GetSigmaToVertex(track) > 4.) return kFALSE;
1268 //____________________________________________________________________
1269 Float_t AliTOFT0v1::GetSigmaToVertex(AliESDtrack* esdTrack) const
1271 // Calculates the number of sigma to the vertex.
1276 esdTrack->GetImpactParameters(b,bCov);
1278 if (bCov[0]<=0 || bCov[2]<=0) {
1279 bCov[0]=0; bCov[2]=0;
1281 bRes[0] = TMath::Sqrt(bCov[0]);
1282 bRes[1] = TMath::Sqrt(bCov[2]);
1284 // -----------------------------------
1285 // How to get to a n-sigma cut?
1287 // The accumulated statistics from 0 to d is
1289 // -> Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma)
1290 // -> 1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma)
1292 // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-d**2)/2)
1293 // Can this be expressed in a different way?
1295 if (bRes[0] == 0 || bRes[1] ==0)
1298 //Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));
1299 Float_t d = TMath::Sqrt(ToCalculatePower(b[0]/bRes[0],2) + ToCalculatePower(b[1]/bRes[1],2));
1301 // work around precision problem
1302 // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :(
1303 // 1e-15 corresponds to nsigma ~ 7.7
1304 if (TMath::Exp(-d * d / 2) < 1e-15)
1307 Float_t nSigma = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
1310 //____________________________________________________________________
1312 Bool_t AliTOFT0v1::CheckTPCMatching(AliESDtrack *track,Int_t imass) const{
1313 Bool_t status = kFALSE;
1315 Double_t exptimes[5];
1316 track->GetIntegratedTimes(exptimes);
1318 Float_t dedx = track->GetTPCsignal();
1321 track->GetInnerPxPyPz(ptpc);
1322 Float_t momtpc=TMath::Sqrt(ptpc[0]*ptpc[0] + ptpc[1]*ptpc[1] + ptpc[2]*ptpc[2]);
1324 if(imass > 2 || imass < 0) return status;
1327 AliPID::EParticleType type=AliPID::EParticleType(i);
1329 Float_t dedxExp = fPIDesd->GetTPCResponse().GetExpectedSignal(momtpc,type);
1330 Float_t resolutionTPC = fPIDesd->GetTPCResponse().GetExpectedSigma(momtpc,track->GetTPCsignalN(),type);
1332 if(TMath::Abs(dedx - dedxExp) < 5 * resolutionTPC){
1339 //____________________________________________________________________
1340 Float_t AliTOFT0v1::ToCalculatePower(Float_t base, Int_t exponent) const
1343 // Returns base^exponent
1348 for (Int_t ii=exponent; ii>0; ii--)
1354 //____________________________________________________________________
1355 Int_t AliTOFT0v1::ToCalculatePower(Int_t base, Int_t exponent) const
1358 // Returns base^exponent
1363 for (Int_t ii=exponent; ii>0; ii--)