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Update the mult corr histograms
[u/mrichter/AliRoot.git] / TOF / AliTOFT0v1.cxx
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536031f2 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
6a4e212e 16/* $Id: AliTOFT0v1.cxx,v 1.8 2010/01/19 16:32:20 noferini Exp $ */
536031f2 17
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.
6a4e212e 22// We select in the ESD some "primary" particles - or tracks in the following -
536031f2 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
6a4e212e 25// of the track when the TOF is reached,
26// the momentum and the time of flight
536031f2 27// given by the TOF detector.
536031f2 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.
43// Use case:
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
52// assignment
53// Different Selections for pp and Pb-Pb: Momentum Range, Max Time, # pions
54//-- Author: F. Pierella
6a4e212e 55//-- Mod By Silvia Arcelli, Francesco Noferini, Barbara Guerzoni
536031f2 56//////////////////////////////////////////////////////////////////////////////
57
536031f2 58#include "AliESDtrack.h"
8f589502 59#include "AliESDEvent.h"
03bd764d 60#include "AliTOFT0v1.h"
2a258f40 61#include "TBenchmark.h"
62#include "AliPID.h"
63#include "AliESDpid.h"
536031f2 64
65ClassImp(AliTOFT0v1)
66
67//____________________________________________________________________________
2a258f40 68AliTOFT0v1::AliTOFT0v1(AliESDpid *extPID):
5b4ed716 69 TObject(),
03bd764d 70 fLowerMomBound(0.5),
5b4ed716 71 fUpperMomBound(3),
8f589502 72 fTimeCorr(0.),
2a258f40 73 fEvent(0x0),
62f44f07 74 fPIDesd(extPID),
75 fTracks(new TObjArray(10)),
76 fGTracks(new TObjArray(10)),
77 fTracksT0(new TObjArray(10))
536031f2 78{
8f589502 79 //
80 // default constructor
81 //
2a258f40 82 if(AliPID::ParticleMass(0) == 0) new AliPID();
83
84 if(!fPIDesd){
85 fPIDesd = new AliESDpid();
86 }
536031f2 87
5b4ed716 88 Init(NULL);
89
8f589502 90}
91
8f589502 92//____________________________________________________________________________
2a258f40 93AliTOFT0v1::AliTOFT0v1(AliESDEvent* event,AliESDpid *extPID):
5b4ed716 94 TObject(),
03bd764d 95 fLowerMomBound(0.5),
5b4ed716 96 fUpperMomBound(3.0),
8f589502 97 fTimeCorr(0.),
2a258f40 98 fEvent(event),
62f44f07 99 fPIDesd(extPID),
100 fTracks(new TObjArray(10)),
101 fGTracks(new TObjArray(10)),
102 fTracksT0(new TObjArray(10))
8f589502 103{
104 //
105 // real constructor
106 //
2a258f40 107 if(AliPID::ParticleMass(0) == 0) new AliPID();
536031f2 108
2a258f40 109 if(!fPIDesd){
110 fPIDesd = new AliESDpid();
111 }
5b4ed716 112
2a258f40 113 Init(event);
8f589502 114
536031f2 115}
8f589502 116//____________________________________________________________________________
117AliTOFT0v1& AliTOFT0v1::operator=(const AliTOFT0v1 &tzero)
118{
119 //
120 // assign. operator
121 //
122
123 if (this == &tzero)
124 return *this;
125
126 fLowerMomBound=tzero.fLowerMomBound;
127 fUpperMomBound=tzero.fUpperMomBound;
8f589502 128 fTimeCorr=tzero.fTimeCorr;
129 fEvent=tzero.fEvent;
8f589502 130 fT0SigmaT0def[0]=tzero.fT0SigmaT0def[0];
131 fT0SigmaT0def[1]=tzero.fT0SigmaT0def[1];
132 fT0SigmaT0def[2]=tzero.fT0SigmaT0def[2];
133 fT0SigmaT0def[3]=tzero.fT0SigmaT0def[3];
134
62f44f07 135 fTracks=tzero.fTracks;
136 fGTracks=tzero.fGTracks;
137 fTracksT0=tzero.fTracksT0;
138
139 for (Int_t ii=0; ii<tzero.fTracks->GetEntries(); ii++)
140 fTracks->AddLast(tzero.fTracks->At(ii));
141
142 for (Int_t ii=0; ii<tzero.fGTracks->GetEntries(); ii++)
143 fGTracks->AddLast(tzero.fGTracks->At(ii));
144
145 for (Int_t ii=0; ii<tzero.fTracksT0->GetEntries(); ii++)
146 fTracksT0->AddLast(tzero.fTracksT0->At(ii));
147
8f589502 148 return *this;
149}
5b4ed716 150
536031f2 151//____________________________________________________________________________
152AliTOFT0v1::~AliTOFT0v1()
153{
154 // dtor
8f589502 155 fEvent=NULL;
156
62f44f07 157 fTracks->Delete();
158 delete fTracks;
159 fTracks=0x0;
160
161 fGTracks->Delete();
162 delete fGTracks;
163 fGTracks=0x0;
164
165 fTracksT0->Delete();
166 delete fTracksT0;
167 fTracksT0=0x0;
168
536031f2 169}
5b4ed716 170//____________________________________________________________________________
171
172void
173AliTOFT0v1::Init(AliESDEvent *event)
174{
175
176 /*
177 * init
178 */
179
180 fEvent = event;
181 fT0SigmaT0def[0]=0.;
182 fT0SigmaT0def[1]=0.6;
183 fT0SigmaT0def[2]=0.;
184 fT0SigmaT0def[3]=0.;
185
186}
187
536031f2 188//____________________________________________________________________________
189Double_t * AliTOFT0v1::DefineT0(Option_t *option)
190{
8f589502 191 // Caluclate the Event Time using the ESD TOF time
192
2a258f40 193 TBenchmark *bench=new TBenchmark();
194 bench->Start("t0computation");
195
5b4ed716 196 fT0SigmaT0def[0]=0.;
197 fT0SigmaT0def[1]=0.600;
198 fT0SigmaT0def[2]=0.;
199 fT0SigmaT0def[3]=0.;
536031f2 200
2a258f40 201 const Int_t nmaxtracksinsetMax=10;
202 Int_t nmaxtracksinset=10;
6a4e212e 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;
206// }
536031f2 207
536031f2 208 Int_t nsets=0;
8f589502 209 Int_t nUsedTracks=0;
536031f2 210 Int_t ngoodsetsSel= 0;
211 Float_t t0bestSel[300];
8f589502 212 Float_t eT0bestSel[300];
213 Float_t chiSquarebestSel[300];
214 Float_t confLevelbestSel[300];
536031f2 215 Float_t t0bestallSel=0.;
8f589502 216 Float_t eT0bestallSel=0.;
536031f2 217 Float_t sumWt0bestallSel=0.;
8f589502 218 Float_t eMeanTzeroPi=0.;
536031f2 219 Float_t meantzeropi=0.;
220 Float_t sumAllweightspi=0.;
221 Double_t t0def=-999;
222 Double_t deltat0def=999;
223 Int_t ngoodtrktrulyused=0;
224 Int_t ntracksinsetmyCut = 0;
225
226 Int_t ntrk=fEvent->GetNumberOfTracks();
227
62f44f07 228 //AliESDtrack **fTracks=new AliESDtrack*[ntrk];
536031f2 229 Int_t ngoodtrk=0;
230 Int_t ngoodtrkt0 =0;
231 Float_t mintime =1E6;
232
233 // First Track loop, Selection of good tracks
234
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;
03bd764d 240 if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
536031f2 241 Double_t time=t->GetTOFsignal();
242
243 time*=1.E-3; // tof given in nanoseconds
244 if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue;
2a258f40 245
14b2cbea 246 if (!AcceptTrack(t)) continue;
536031f2 247
2a258f40 248 if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays
90beec49 249
536031f2 250 if(time <= mintime) mintime=time;
62f44f07 251 //fTracks[ngoodtrk]=t;
252 fTracks->AddLast(t);
536031f2 253 ngoodtrk++;
254 }
62f44f07 255
2a258f40 256 if(ngoodtrk>22) nmaxtracksinset = 6;
257
03bd764d 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;
536031f2 261
62f44f07 262 //AliESDtrack **fGTracks=new AliESDtrack*[ngoodtrk];
536031f2 263
62f44f07 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);
536031f2 268 Double_t time=t->GetTOFsignal();
269
270 if((time-mintime*1.E3)<50.E3){ // For pp and per
62f44f07 271 //fGTracks[ngoodtrkt0]=t;
272 fGTracks->AddLast(t);
536031f2 273 ngoodtrkt0++;
274 }
275 }
276
62f44f07 277 //delete[] fTracks;
278 fTracks->Clear();
536031f2 279
280 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
281 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
282 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
283
284 if(ngoodtrkt0<2){
6a4e212e 285// cout << "less than 2 tracks, skip event " << endl;
536031f2 286 t0def=-999;
287 deltat0def=0.600;
288 fT0SigmaT0def[0]=t0def;
289 fT0SigmaT0def[1]=deltat0def;
290 fT0SigmaT0def[2]=ngoodtrkt0;
291 fT0SigmaT0def[3]=ngoodtrkt0;
292 //goto finish;
293 }
294 if(ngoodtrkt0>=2){
295 // Decide how many tracks in set
03bd764d 296 Int_t ntracksinset = std::min(ngoodtrkt0,nmaxtracksinsetCurrent);
536031f2 297 Int_t nset=1;
298
299 if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
6a4e212e 300
536031f2 301 // Loop over selected sets
302
303 if(nset>=1){
304 for (Int_t i=0; i< nset; i++) {
305
306 Float_t t0best=999.;
8f589502 307 Float_t eT0best=999.;
536031f2 308 Float_t chisquarebest=99999.;
309 Int_t npionbest=0;
310
311 Int_t ntracksinsetmy=0;
62f44f07 312 //AliESDtrack **fTracksT0=new AliESDtrack*[ntracksinset];
536031f2 313 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
314 Int_t index = itrk+i*ntracksinset;
62f44f07 315 //if(index < ngoodtrkt0){
316 if(index < fGTracks->GetEntries()){
317 //AliESDtrack *t=fGTracks[index];
318 AliESDtrack *t=(AliESDtrack*)fGTracks->At(index);
319 //fTracksT0[itrk]=t;
320 fTracksT0->AddLast(t);
536031f2 321 ntracksinsetmy++;
322 }
323 }
324
325 // Analyse it
326
2a258f40 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];
536031f2 338 Float_t massarray[3]={0.13957,0.493677,0.9382723};
2a258f40 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];
536031f2 348
349 for (Int_t j=0; j<ntracksinset; j++) {
350 assparticle[j] = 3;
351 timeofflight[j] = 0;
352 momentum[j] = 0;
353 timezero[j] = 0;
354 weightedtimezero[j] = 0;
355 beta[j] = 0;
356 texp[j] = 0;
357 dtexp[j] = 0;
358 sqMomError[j] = 0;
359 sqTrackError[j] = 0;
360 tracktoflen[j] = 0;
361 besttimezero[j] = 0;
362 besttexp[j] = 0;
363 besttimeofflight[j] = 0;
364 bestmomentum[j] = 0;
365 bestchisquare[j] = 0;
366 bestweightedtimezero[j] = 0;
367 bestsqTrackError[j] = 0;
368 imass[j] = 1;
369 }
370
62f44f07 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);
536031f2 375 Double_t momOld=t->GetP();
376 Double_t mom=momOld-0.0036*momOld;
377 Double_t time=t->GetTOFsignal();
378
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
383
8f589502 384 timeofflight[j]=time;
385 tracktoflen[j]=toflen;
536031f2 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;
389 momentum[j]=mom;
390 assparticle[j]=3;
391
392 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
393
536031f2 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]));
2a258f40 398 sqTrackError[itz]=sqMomError[itz]; //in ns
536031f2 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++)
404
405
406 // Then, Combinatorial Algorithm
407
408 if(ntracksinsetmy<2 )break;
409
410 for (Int_t j=0; j<ntracksinsetmy; j++) {
411 imass[j] = 3;
412 }
413
62f44f07 414 //Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
415 Int_t ncombinatorial = ToCalculatePower(3,ntracksinsetmy);
536031f2 416
417 // Loop on mass hypotheses
418 for (Int_t k=0; k < ncombinatorial;k++) {
419 for (Int_t j=0; j<ntracksinsetmy; j++) {
62f44f07 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);
536031f2 422 texp[j]=exptof[j][imass[j]];
423 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
1fde62a1 424 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
536031f2 425 }
90beec49 426
536031f2 427 Float_t sumAllweights=0.;
428 Float_t meantzero=0.;
8f589502 429 Float_t eMeanTzero=0.;
536031f2 430
431 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
2a258f40 432 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
536031f2 433
434 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
435
436 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
437 sumAllweights+=1./sqTrackError[itz];
438 meantzero+=weightedtimezero[itz];
439
440 } // end loop for (Int_t itz=0; itz<15;itz++)
441
442 meantzero=meantzero/sumAllweights; // it is given in [ns]
8f589502 443 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
536031f2 444
445 // calculate chisquare
446
447 Float_t chisquare=0.;
448 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
1fde62a1 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;
536031f2 452 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
453
454 if(chisquare<=chisquarebest){
455 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
456
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];
1fde62a1 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;
536031f2 466 }
467
468 Int_t npion=0;
469 for (Int_t j=0; j<ntracksinsetmy; j++) {
470 assparticle[j]=imass[j];
471 if(imass[j] == 0) npion++;
472 }
473 npionbest=npion;
474 chisquarebest=chisquare;
475 t0best=meantzero;
8f589502 476 eT0best=eMeanTzero;
536031f2 477 } // close if(dummychisquare<=chisquare)
478
479 }
480
2a258f40 481 Double_t chi2cut[nmaxtracksinsetMax];
536031f2 482 chi2cut[0] = 0;
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.);
486 }
487
488 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
489
03bd764d 490// printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
536031f2 491
492 Bool_t kRedoT0 = kFALSE;
493 ntracksinsetmyCut = ntracksinsetmy;
2a258f40 494 Bool_t usetrack[nmaxtracksinsetMax];
536031f2 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)){
498 kRedoT0 = kTRUE;
499 ntracksinsetmyCut--;
500 usetrack[icsq] = kFALSE;
501 }
502 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
503
6a4e212e 504 // printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
536031f2 505
506 // Loop on mass hypotheses Redo
507 if(kRedoT0 && ntracksinsetmyCut > 1){
6a4e212e 508 // printf("Redo T0\n");
536031f2 509 for (Int_t k=0; k < ncombinatorial;k++) {
510 for (Int_t j=0; j<ntracksinsetmy; j++) {
62f44f07 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);
536031f2 513 texp[j]=exptof[j][imass[j]];
514 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
1fde62a1 515 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
536031f2 516 }
517
518 Float_t sumAllweights=0.;
519 Float_t meantzero=0.;
8f589502 520 Float_t eMeanTzero=0.;
536031f2 521
522 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
523 if(! usetrack[itz]) continue;
2a258f40 524 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
536031f2 525
526 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
527
528 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
529 sumAllweights+=1./sqTrackError[itz];
530 meantzero+=weightedtimezero[itz];
531
532 } // end loop for (Int_t itz=0; itz<15;itz++)
533
534 meantzero=meantzero/sumAllweights; // it is given in [ns]
8f589502 535 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
536031f2 536
537 // calculate chisquare
538
539 Float_t chisquare=0.;
540 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
541 if(! usetrack[icsq]) continue;
1fde62a1 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;
536031f2 545 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
546
547 Int_t npion=0;
548 for (Int_t j=0; j<ntracksinsetmy; j++) {
549 assparticle[j]=imass[j];
550 if(imass[j] == 0) npion++;
551 }
552
90beec49 553 if(chisquare<=chisquarebest && npion>0){
536031f2 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];
1fde62a1 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;
536031f2 565 }
566
567 npionbest=npion;
568 chisquarebest=chisquare;
569 t0best=meantzero;
8f589502 570 eT0best=eMeanTzero;
536031f2 571 } // close if(dummychisquare<=chisquare)
572
573 }
574 }
6a4e212e 575
536031f2 576 // filling histos
577 Float_t confLevel=999;
578
579 // Sets with decent chisquares
580
581 if(chisquarebest<999.){
582 Double_t dblechisquare=(Double_t)chisquarebest;
583 confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1);
03bd764d 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;
536031f2 592
593 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
594
595 if(! usetrack[icsq]) continue;
596
03bd764d 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;
536031f2 605 }
606
607 // Pick up only those with C.L. >1%
608 // if(confLevel>0.01 && ngoodsetsSel<200){
609 if(confLevel>0.01 && ngoodsetsSel<200){
8f589502 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;
536031f2 616 ngoodsetsSel++;
617 ngoodtrktrulyused+=ntracksinsetmyCut;
2a258f40 618
619 // printf("t0 of a set = %f +/- %f\n",t0best,eT0best);
536031f2 620 }
621 else{
6a4e212e 622 // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
536031f2 623 }
624 }
62f44f07 625 //delete[] fTracksT0;
626 fTracksT0->Clear();
536031f2 627 nsets++;
628
629 } // end for the current set
630
90beec49 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;
635 ngoodsetsSel=0;
636 t0bestallSel=0;
637 sumWt0bestallSel=0;
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];
642 ngoodsetsSel++;
643// printf("not rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
644 }
645 else{
646// printf("rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
647 }
648 }
649 }
650 if(ngoodsetsSel < 1){
651 sumWt0bestallSel = 0.0;
652 }
653 //--------------------------------End recomputation
654
8f589502 655 nUsedTracks = ngoodtrkt0;
536031f2 656 if(strstr(option,"all")){
657 if(sumAllweightspi>0.){
658 meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns]
8f589502 659 eMeanTzeroPi=sqrt(1./sumAllweightspi); // it is given in [ns]
536031f2 660 }
661
662 if(sumWt0bestallSel>0){
663 t0bestallSel = t0bestallSel/sumWt0bestallSel;
8f589502 664 eT0bestallSel = sqrt(1./sumWt0bestallSel);
536031f2 665
666 }// end of if(sumWt0bestallSel>0){
667
6a4e212e 668// cout << "T0 all " << t0bestallSel << " +/- " << eT0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
536031f2 669 }
670
671 t0def=t0bestallSel;
8f589502 672 deltat0def=eT0bestallSel;
536031f2 673
674 fT0SigmaT0def[0]=t0def;
2a258f40 675 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def);//*ngoodtrktrulyused/(ngoodtrktrulyused-1));
6a4e212e 676 fT0SigmaT0def[2]=ngoodtrkt0;
536031f2 677 fT0SigmaT0def[3]=ngoodtrktrulyused;
678 }
679 }
62f44f07 680
681 //delete [] fGTracks;
682 fGTracks->Clear();
683
6a4e212e 684 // if(strstr(option,"tim") || strstr(option,"all")){
685 // cout << "AliTOFT0v1:" << endl ;
686 //}
536031f2 687
2a258f40 688 if(fT0SigmaT0def[1] < 0.00001) fT0SigmaT0def[1] = 0.6;
689
690 bench->Stop("t0computation");
691
692 fT0SigmaT0def[4]=bench->GetRealTime("t0computation");
693 fT0SigmaT0def[5]=bench->GetCpuTime("t0computation");
694
695// bench->Print("t0computation");
696// printf("%f %f\n",fT0SigmaT0def[4],fT0SigmaT0def[5]);
697
90beec49 698
699 delete bench;
700 bench=NULL;
5b4ed716 701
702 return fT0SigmaT0def;
703 }
704//__________________________________________________________________
705Double_t * AliTOFT0v1::DefineT0(Option_t *option,Float_t pMinCut,Float_t pMaxCut)
706{
2a258f40 707 TBenchmark *bench=new TBenchmark();
708 bench->Start("t0computation");
709
5b4ed716 710 // Caluclate the Event Time using the ESD TOF time
711
712 fT0SigmaT0def[0]=0.;
713 fT0SigmaT0def[1]=0.600;
714 fT0SigmaT0def[2]=0.;
715 fT0SigmaT0def[3]=0.;
5b4ed716 716
2a258f40 717 const Int_t nmaxtracksinsetMax=10;
718 Int_t nmaxtracksinset=10;
5b4ed716 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;
722// }
723
724
725 Int_t nsets=0;
726 Int_t nUsedTracks=0;
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.;
738 Double_t t0def=-999;
739 Double_t deltat0def=999;
740 Int_t ngoodtrktrulyused=0;
741 Int_t ntracksinsetmyCut = 0;
742
743 Int_t ntrk=fEvent->GetNumberOfTracks();
744
62f44f07 745 //AliESDtrack **fTracks=new AliESDtrack*[ntrk];
5b4ed716 746 Int_t ngoodtrk=0;
747 Int_t ngoodtrkt0 =0;
748 Float_t mintime =1E6;
749
750 // First Track loop, Selection of good tracks
751
995c3398 752 fTracks->Clear();
5b4ed716 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();
760
761 time*=1.E-3; // tof given in nanoseconds
762 if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue;
2a258f40 763
5b4ed716 764 if (!AcceptTrack(t)) continue;
765
9c89b8bd 766 if(t->GetIntegratedLength() < 350)continue; //skip decays
5b4ed716 767 if(t->GetP() > pMinCut && t->GetP() < pMaxCut) continue;
768 if(time <= mintime) mintime=time;
62f44f07 769 //fTracks[ngoodtrk]=t;
770 fTracks->AddLast(t);
5b4ed716 771 ngoodtrk++;
772 }
773
2a258f40 774 if(ngoodtrk>22) nmaxtracksinset = 6;
775
5b4ed716 776
2a258f40 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;
5b4ed716 780
62f44f07 781 //AliESDtrack **fGTracks=new AliESDtrack*[ngoodtrk];
995c3398 782
783 fGTracks->Clear();
62f44f07 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);
5b4ed716 788 Double_t time=t->GetTOFsignal();
789
790 if((time-mintime*1.E3)<50.E3){ // For pp and per
62f44f07 791 //fGTracks[ngoodtrkt0]=t;
792 fGTracks->AddLast(t);
5b4ed716 793 ngoodtrkt0++;
794 }
795 }
62f44f07 796
797 //delete [] fTracks;
798 fTracks->Clear();
799
2a258f40 800// cout << " N. of preselected tracks t0 : " << ngoodtrkt0 << endl;
5b4ed716 801
802 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
803 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
804 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
805
2a258f40 806// cout << " N. of sets : " << nseteq << endl;
807
5b4ed716 808 if(ngoodtrkt0<2){
809// cout << "less than 2 tracks, skip event " << endl;
810 t0def=-999;
811 deltat0def=0.600;
812 fT0SigmaT0def[0]=t0def;
813 fT0SigmaT0def[1]=deltat0def;
814 fT0SigmaT0def[2]=ngoodtrkt0;
815 fT0SigmaT0def[3]=ngoodtrkt0;
816 //goto finish;
817 }
818 if(ngoodtrkt0>=2){
819 // Decide how many tracks in set
820 Int_t ntracksinset = std::min(ngoodtrkt0,nmaxtracksinsetCurrent);
821 Int_t nset=1;
822
823 if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
824
825 // Loop over selected sets
826
827 if(nset>=1){
828 for (Int_t i=0; i< nset; i++) {
2a258f40 829 // printf("Set %i of %i\n",i+1,nset);
5b4ed716 830 Float_t t0best=999.;
831 Float_t eT0best=999.;
832 Float_t chisquarebest=99999.;
833 Int_t npionbest=0;
834
995c3398 835 fTracksT0->Clear();
5b4ed716 836 Int_t ntracksinsetmy=0;
62f44f07 837 //AliESDtrack **fTracksT0=new AliESDtrack*[ntracksinset];
5b4ed716 838 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
839 Int_t index = itrk+i*ntracksinset;
62f44f07 840 //if(index < ngoodtrkt0){
841 if(index < fGTracks->GetEntries()){
842 //AliESDtrack *t=fGTracks[index];
843 AliESDtrack *t=(AliESDtrack*)fGTracks->At(index);
844 //fTracksT0[itrk]=t;
845 fTracksT0->AddLast(t);
5b4ed716 846 ntracksinsetmy++;
847 }
848 }
62f44f07 849
5b4ed716 850 // Analyse it
851
2a258f40 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];
5b4ed716 863 Float_t massarray[3]={0.13957,0.493677,0.9382723};
2a258f40 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];
5b4ed716 873
874 for (Int_t j=0; j<ntracksinset; j++) {
875 assparticle[j] = 3;
876 timeofflight[j] = 0;
877 momentum[j] = 0;
878 timezero[j] = 0;
879 weightedtimezero[j] = 0;
880 beta[j] = 0;
881 texp[j] = 0;
882 dtexp[j] = 0;
883 sqMomError[j] = 0;
884 sqTrackError[j] = 0;
885 tracktoflen[j] = 0;
886 besttimezero[j] = 0;
887 besttexp[j] = 0;
888 besttimeofflight[j] = 0;
889 bestmomentum[j] = 0;
890 bestchisquare[j] = 0;
891 bestweightedtimezero[j] = 0;
892 bestsqTrackError[j] = 0;
893 imass[j] = 1;
894 }
895
62f44f07 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);
5b4ed716 900 Double_t momOld=t->GetP();
901 Double_t mom=momOld-0.0036*momOld;
902 Double_t time=t->GetTOFsignal();
903
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
908
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;
914 momentum[j]=mom;
915 assparticle[j]=3;
916
917 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
918
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]));
2a258f40 923 sqTrackError[itz]=sqMomError[itz]; //in ns
5b4ed716 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++)
929
930
931 // Then, Combinatorial Algorithm
932
933 if(ntracksinsetmy<2 )break;
934
935 for (Int_t j=0; j<ntracksinsetmy; j++) {
936 imass[j] = 3;
937 }
938
62f44f07 939 //Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
940 Int_t ncombinatorial = ToCalculatePower(3,ntracksinsetmy);
5b4ed716 941
942 // Loop on mass hypotheses
943 for (Int_t k=0; k < ncombinatorial;k++) {
944 for (Int_t j=0; j<ntracksinsetmy; j++) {
62f44f07 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);
5b4ed716 947 texp[j]=exptof[j][imass[j]];
948 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
1fde62a1 949 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
5b4ed716 950 }
90beec49 951
5b4ed716 952 Float_t sumAllweights=0.;
953 Float_t meantzero=0.;
954 Float_t eMeanTzero=0.;
955
956 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
2a258f40 957 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
5b4ed716 958
959 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
960
961 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
962 sumAllweights+=1./sqTrackError[itz];
963 meantzero+=weightedtimezero[itz];
964
965 } // end loop for (Int_t itz=0; itz<15;itz++)
966
967 meantzero=meantzero/sumAllweights; // it is given in [ns]
968 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
969
970 // calculate chisquare
5b4ed716 971 Float_t chisquare=0.;
972 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
1fde62a1 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;
5b4ed716 976 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
977
978 if(chisquare<=chisquarebest){
979 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
980
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];
1fde62a1 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;
5b4ed716 990 }
991
992 Int_t npion=0;
993 for (Int_t j=0; j<ntracksinsetmy; j++) {
994 assparticle[j]=imass[j];
995 if(imass[j] == 0) npion++;
996 }
997 npionbest=npion;
998 chisquarebest=chisquare;
999 t0best=meantzero;
1000 eT0best=eMeanTzero;
1001 } // close if(dummychisquare<=chisquare)
5b4ed716 1002 }
1003
2a258f40 1004 Double_t chi2cut[nmaxtracksinsetMax];
5b4ed716 1005 chi2cut[0] = 0;
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.);
1009 }
1010
1011 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
1012
90beec49 1013// printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
5b4ed716 1014
1015 Bool_t kRedoT0 = kFALSE;
1016 ntracksinsetmyCut = ntracksinsetmy;
2a258f40 1017 Bool_t usetrack[nmaxtracksinsetMax];
5b4ed716 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)){
90beec49 1021 kRedoT0 = kTRUE;
1022 ntracksinsetmyCut--;
1023 usetrack[icsq] = kFALSE;
5b4ed716 1024 }
1025 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
1026
90beec49 1027// printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
2a258f40 1028
5b4ed716 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++) {
62f44f07 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);
5b4ed716 1036 texp[j]=exptof[j][imass[j]];
1037 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
1fde62a1 1038 // if(! CheckTPCMatching((AliESDtrack*)fTracksT0->At(j),imass[j])) dtexp[j]*=100;
5b4ed716 1039 }
1040
1041 Float_t sumAllweights=0.;
1042 Float_t meantzero=0.;
1043 Float_t eMeanTzero=0.;
1044
1045 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
1046 if(! usetrack[itz]) continue;
2a258f40 1047 sqTrackError[itz]=dtexp[itz]*dtexp[itz]*1E-6; //in ns2
5b4ed716 1048
1049 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
1050
1051 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
1052 sumAllweights+=1./sqTrackError[itz];
1053 meantzero+=weightedtimezero[itz];
1054
1055 } // end loop for (Int_t itz=0; itz<15;itz++)
1056
1057 meantzero=meantzero/sumAllweights; // it is given in [ns]
1058 eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns]
1059
1060 // calculate chisquare
1061
1062 Float_t chisquare=0.;
1063 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
1064 if(! usetrack[icsq]) continue;
1fde62a1 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;
5b4ed716 1068 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
1069
1070 Int_t npion=0;
1071 for (Int_t j=0; j<ntracksinsetmy; j++) {
1072 assparticle[j]=imass[j];
1073 if(imass[j] == 0) npion++;
1074 }
1075
90beec49 1076 if(chisquare<=chisquarebest && npion>0){
5b4ed716 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];
1fde62a1 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;
5b4ed716 1088 }
1089
1090 npionbest=npion;
1091 chisquarebest=chisquare;
1092 t0best=meantzero;
1093 eT0best=eMeanTzero;
1094 } // close if(dummychisquare<=chisquare)
1095
1096 }
1097 }
1098
1099 // filling histos
1100 Float_t confLevel=999;
1101
1102 // Sets with decent chisquares
2a258f40 1103 // printf("Chi2best of the set = %f \n",chisquarebest);
5b4ed716 1104
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;
1116
90beec49 1117 Int_t ntrackincurrentsel=0;
5b4ed716 1118 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
1119
1120 if(! usetrack[icsq]) continue;
1121
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;
90beec49 1130 ntrackincurrentsel++;
5b4ed716 1131 }
1132
2a258f40 1133 // printf("%i) CL(Chi2) = %f < 0.01\n",ngoodsetsSel,confLevel);
1134
5b4ed716 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;
1144 ngoodsetsSel++;
2a258f40 1145 ngoodtrktrulyused+=ntracksinsetmyCut;
90beec49 1146// printf("T0best = %f +/- %f (%i-%i) -- conflevel = %f\n",t0best,eT0best,ntrackincurrentsel,npionbest,confLevel);
5b4ed716 1147 }
1148 else{
1149 // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
1150 }
1151 }
62f44f07 1152 //delete[] fTracksT0;
1153 fTracksT0->Clear();
5b4ed716 1154 nsets++;
1155
1156 } // end for the current set
1157
90beec49 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;
1162 ngoodsetsSel=0;
1163 t0bestallSel=0;
1164 sumWt0bestallSel=0;
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];
1169 ngoodsetsSel++;
1170// printf("not rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
1171 }
1172 else{
1173// printf("rejected %f +/- %f\n",t0bestSel[itz]/eT0bestSel[itz],1./TMath::Sqrt(eT0bestSel[itz]));
1174 }
1175 }
1176 }
1177 if(ngoodsetsSel < 1){
1178 sumWt0bestallSel = 0.0;
1179 }
1180 //--------------------------------End recomputation
1181
5b4ed716 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]
1187 }
1188
2a258f40 1189 // printf("t0bestallSel = %f -- eT0bestallSel = %f\n",t0bestallSel,sumWt0bestallSel);
1190
5b4ed716 1191 if(sumWt0bestallSel>0){
1192 t0bestallSel = t0bestallSel/sumWt0bestallSel;
1193 eT0bestallSel = sqrt(1./sumWt0bestallSel);
2a258f40 1194 // printf("Final) t0bestallSel = %f -- eT0bestallSel = %f\n",t0bestallSel,eT0bestallSel);
5b4ed716 1195 }// end of if(sumWt0bestallSel>0){
1196
1197// cout << "T0 all " << t0bestallSel << " +/- " << eT0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
1198 }
1199
1200 t0def=t0bestallSel;
1201 deltat0def=eT0bestallSel;
5b4ed716 1202
1203 fT0SigmaT0def[0]=t0def;
2a258f40 1204 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def);//*ngoodtrktrulyused/(ngoodtrktrulyused-1));
5b4ed716 1205 fT0SigmaT0def[2]=ngoodtrkt0;
1206 fT0SigmaT0def[3]=ngoodtrktrulyused;
1207 }
1208 }
62f44f07 1209
1210 //delete [] fGTracks;
1211 fGTracks->Clear();
1212
5b4ed716 1213 // if(strstr(option,"tim") || strstr(option,"all")){
1214 // cout << "AliTOFT0v1:" << endl ;
1215 //}
1216
2a258f40 1217 if(fT0SigmaT0def[1] < 0.00001) fT0SigmaT0def[1] = 0.6;
1218
1219 bench->Stop("t0computation");
1220
1221 fT0SigmaT0def[4]=bench->GetRealTime("t0computation");
1222 fT0SigmaT0def[5]=bench->GetCpuTime("t0computation");
1223
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]));
1226
90beec49 1227 delete bench;
1228 bench=NULL;
5b4ed716 1229
536031f2 1230 return fT0SigmaT0def;
1231 }
1232//__________________________________________________________________
8f589502 1233Float_t AliTOFT0v1::GetMomError(Int_t index, Float_t mom, Float_t texp) const
536031f2 1234{
8f589502 1235 // Take the error extimate for the TOF time in the track reconstruction
536031f2 1236
536031f2 1237 static const Double_t kMasses[]={
1238 0.000511, 0.105658, 0.139570, 0.493677, 0.938272, 1.875613
1239 };
1240
1241 Double_t mass=kMasses[index+2];
536031f2 1242
2a258f40 1243 Float_t sigma = fPIDesd->GetTOFResponse().GetExpectedSigma(mom,texp,mass);
536031f2 1244
1245 return sigma;
1246}
14b2cbea 1247
1248//__________________________________________________________________
1249Bool_t AliTOFT0v1::AcceptTrack(AliESDtrack *track)
1250{
1251
1252 /* TPC refit */
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;
1258 /* chi2 TPC */
1259 if (track->GetTPCchi2()/Float_t(track->GetTPCclusters(0)) > 3.5) return kFALSE;
1260 /* sigma to vertex */
1261 if (GetSigmaToVertex(track) > 4.) return kFALSE;
1262
1263 /* accept track */
1264 return kTRUE;
1265
1266}
1267
1268//____________________________________________________________________
8f589502 1269Float_t AliTOFT0v1::GetSigmaToVertex(AliESDtrack* esdTrack) const
14b2cbea 1270{
1271 // Calculates the number of sigma to the vertex.
1272
1273 Float_t b[2];
1274 Float_t bRes[2];
1275 Float_t bCov[3];
1276 esdTrack->GetImpactParameters(b,bCov);
1277
1278 if (bCov[0]<=0 || bCov[2]<=0) {
1279 bCov[0]=0; bCov[2]=0;
1280 }
1281 bRes[0] = TMath::Sqrt(bCov[0]);
1282 bRes[1] = TMath::Sqrt(bCov[2]);
1283
1284 // -----------------------------------
1285 // How to get to a n-sigma cut?
1286 //
1287 // The accumulated statistics from 0 to d is
1288 //
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)
1291 //
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?
1294
1295 if (bRes[0] == 0 || bRes[1] ==0)
1296 return -1;
1297
62f44f07 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));
14b2cbea 1300
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)
1305 return 1000;
1306
1307 Float_t nSigma = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
1308 return nSigma;
1309}
90beec49 1310//____________________________________________________________________
1311
1312Bool_t AliTOFT0v1::CheckTPCMatching(AliESDtrack *track,Int_t imass) const{
1313 Bool_t status = kFALSE;
1314
1315 Double_t exptimes[5];
1316 track->GetIntegratedTimes(exptimes);
1317
1318 Float_t dedx = track->GetTPCsignal();
1319
1320 Double_t ptpc[3];
1321 track->GetInnerPxPyPz(ptpc);
1322 Float_t momtpc=TMath::Sqrt(ptpc[0]*ptpc[0] + ptpc[1]*ptpc[1] + ptpc[2]*ptpc[2]);
1323
1324 if(imass > 2 || imass < 0) return status;
1325 Int_t i = imass+2;
1326
1327 AliPID::EParticleType type=AliPID::EParticleType(i);
1328
1329 Float_t dedxExp = fPIDesd->GetTPCResponse().GetExpectedSignal(momtpc,type);
1330 Float_t resolutionTPC = fPIDesd->GetTPCResponse().GetExpectedSigma(momtpc,track->GetTPCsignalN(),type);
1331
1332 if(TMath::Abs(dedx - dedxExp) < 5 * resolutionTPC){
1333 status = kTRUE;
1334 }
1335
1336 return status;
1337}
62f44f07 1338
1339//____________________________________________________________________
1340Float_t AliTOFT0v1::ToCalculatePower(Float_t base, Int_t exponent) const
1341{
1342 //
1343 // Returns base^exponent
1344 //
1345
1346 Float_t power=1.;
1347
1348 for (Int_t ii=exponent; ii>0; ii--)
1349 power=power*base;
1350
1351 return power;
1352
1353}
1354//____________________________________________________________________
1355Int_t AliTOFT0v1::ToCalculatePower(Int_t base, Int_t exponent) const
1356{
1357 //
1358 // Returns base^exponent
1359 //
1360
1361 Int_t power=1;
1362
1363 for (Int_t ii=exponent; ii>0; ii--)
1364 power=power*base;
1365
1366 return power;
1367
1368}