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added class to handle TOF information including event-time measurement performed...
[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
16/* $Id: AliTOFT0v1.cxx,v 1.8 2003/10/23 16:32:20 hristov Exp $ */
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.
22// We select in the MonteCarlo 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 (a standard TOF hit does not contain this
26// additional information, this is the reason why we implemented a new time zero
27// dedicated TOF hit class AliTOFhitT0; in order to store this type of hit You
28// have to use the AliTOFv4T0 as TOF class in Your Config.C. In AliTOFv4T0 the
29// StepManager was modified in order to fill the TOF hit branch with this type
30// of hits; in fact the AliTOF::AddT0Hit is called rather that the usual AliTOF::AddHit),
31// the momentum at generation (from TreeK) and the time of flight
32// given by the TOF detector.
33// (Observe that the ctor of the AliTOF class, when the AliTOFv4T0 class is used, is called
34// with the "tzero" option: it is in order create the fHits TClonesArray filled with
35// AliTOFhitT0 objects, rather than with normal AliTOFhit)
36// Then Momentum and time of flight for each track are smeared according to
37// known experimental resolution (all sources of error have been token into account).
38// Let consider now only one set of 10 tracks (the algorithm is the same for all sets).
39// Assuming the (mass) hypothesis that each track can be AUT a pion, AUT a kaon, AUT a proton,
40// we consider all the 3 at 10 possible cases.
41// For each track in each (mass) configuration
42// (a configuration can be e.g. pion/pion/kaon/proton/pion/proton/kaon/kaon/pion/pion)
43// we calculate the time zero (we know in fact the velocity of the track after
44// the assumption about its mass, the time of flight given by the TOF, and the
45// corresponding path travelled till the TOF detector). Then for each mass configuration we have
46// 10 time zero and we can calculate the ChiSquare for the current configuration using the
47// weighted mean over all 10 time zero.
48// We call the best assignment the mass configuration that gives the minimum value of the ChiSquare.
49// We plot the weighted mean over all 10 time zero for the best assignment,
50// the ChiSquare for the best assignment and the corresponding confidence level.
51// The strong assumption is the MC selection of primary particles. It will be introduced
52// in the future also some more realistic simulation about this point.
53// Use case:
54// root [0] AliTOFT0v1 * tzero = new AliTOFT0v1("galice.root")
55// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
56// root [1] tzero->ExecuteTask()
57// root [2] tzero->ExecuteTask("tim")
58// // available parameters:
59// tim - print benchmarking information
60// all - print usefull informations about the number of misidentified tracks
61// and a comparison about the true configuration (known from MC) and the best
62// assignment
63// Different Selections for pp and Pb-Pb: Momentum Range, Max Time, # pions
64//-- Author: F. Pierella
65//-- Mod By SA.
66//////////////////////////////////////////////////////////////////////////////
67
68#include <Riostream.h>
69#include <stdlib.h>
70
71#include <TBenchmark.h>
72#include <TCanvas.h>
73#include <TClonesArray.h>
74#include <TFile.h>
75#include <TFolder.h>
76#include <TFrame.h>
77#include <TH1.h>
78#include <TH2.h>
79#include <TProfile.h>
80#include <TParticle.h>
81#include <TROOT.h>
82#include <TSystem.h>
83#include <TTree.h>
84#include <TVirtualMC.h>
85#include "AliTOFT0v1.h"
86#include "AliMC.h"
87#include "AliESDtrack.h"
88#include "AliESD.h"
89#include <AliStack.h>
90#include "AliESDtrackCuts.h"
91#include "AliTOFcalibHisto.h"
92
93ClassImp(AliTOFT0v1)
94
95//____________________________________________________________________________
96AliTOFT0v1::AliTOFT0v1(AliESDEvent* event)
97{
98 fLowerMomBound=0.4; // [GeV/c] default value pp
99 fUpperMomBound=2.0 ; // [GeV/c] default value pp
100 fTimeResolution = 0.80e-10; // 80 ps by default
101 fTimeCorr = 0.0; // in ns by default
102 fLOffset=0.0;
103 fT0Offset=0.0;
104 fEvent=event;
105
106 fT0SigmaT0def[0]=-999.;
107 fT0SigmaT0def[1]=999.;
108 fT0SigmaT0def[2]=-999.;
109 fT0SigmaT0def[3]=-999.;
110
111 fDeltaTfromMisallinement = 0.; // in ps
112}
113
114//____________________________________________________________________________
115AliTOFT0v1::AliTOFT0v1(const AliTOFT0v1 & tzero)
116{
117 ( (AliTOFT0v1 &)tzero ).Copy(*this);
118}
119
120//____________________________________________________________________________
121AliTOFT0v1::~AliTOFT0v1()
122{
123 // dtor
124
125}
126void AliTOFT0v1::SetTimeResolution(Double_t timeresolution){
127 fTimeResolution=timeresolution;
128}
129//____________________________________________________________________________
130//____________________________________________________________________________
131Double_t * AliTOFT0v1::DefineT0(Option_t *option)
132{
133 Float_t timeresolutioninns=fTimeResolution*(1.e+9) * TMath::Sqrt(2.); // convert in [ns]
134
135 const Int_t nmaxtracksinset=10;
136 if(strstr(option,"all")){
137 cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl;
138 cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl;
139 }
140
141
142 Int_t nsets=0;
143 Int_t NusedTracks=0;
144 Int_t ngoodsetsSel= 0;
145 Float_t t0bestSel[300];
146 Float_t Et0bestSel[300];
147 Float_t ChisquarebestSel[300];
148 Float_t ConfLevelbestSel[300];
149 Float_t t0bestallSel=0.;
150 Float_t Et0bestallSel=0.;
151 Float_t sumWt0bestallSel=0.;
152 Float_t Emeantzeropi=0.;
153 Float_t meantzeropi=0.;
154 Float_t sumAllweightspi=0.;
155 Double_t t0def=-999;
156 Double_t deltat0def=999;
157 Int_t ngoodtrktrulyused=0;
158 Int_t ntracksinsetmyCut = 0;
159
160 Int_t ntrk=fEvent->GetNumberOfTracks();
161
162 AliESDtrack **tracks=new AliESDtrack*[ntrk];
163 Int_t ngoodtrk=0;
164 Int_t ngoodtrkt0 =0;
165 Float_t mintime =1E6;
166
167 // First Track loop, Selection of good tracks
168
169 for (Int_t itrk=0; itrk<ntrk; itrk++) {
170 AliESDtrack *t=fEvent->GetTrack(itrk);
171 Double_t momOld=t->GetP();
172 Double_t mom=momOld-0.0036*momOld;
173 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
174 Double_t time=t->GetTOFsignal();
175
176 time*=1.E-3; // tof given in nanoseconds
177 if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue;
178
179 AliESDtrackCuts* esdTrackCuts = new AliESDtrackCuts();
180 Bool_t tpcRefit = kTRUE;
181 Double_t nSigma = 4;
182 Bool_t sigmaToVertex = kTRUE;
183 esdTrackCuts->SetRequireSigmaToVertex(sigmaToVertex);
184 if (sigmaToVertex) {
185 esdTrackCuts->SetMaxNsigmaToVertex(nSigma);
186 }
187 else{
188 esdTrackCuts->SetMaxDCAToVertexZ(3.0);
189 esdTrackCuts->SetMaxDCAToVertexXY(3.0);
190 }
191 esdTrackCuts->SetRequireTPCRefit(tpcRefit);
192 esdTrackCuts->SetAcceptKinkDaughters(kFALSE);
193 esdTrackCuts->SetMinNClustersTPC(50);
194 esdTrackCuts->SetMaxChi2PerClusterTPC(3.5);
195 Bool_t accepted;
196 accepted=esdTrackCuts->AcceptTrack(t);
197 if(!accepted) continue;
198
199 if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays
200 if(time <= mintime) mintime=time;
201 tracks[ngoodtrk]=t;
202 ngoodtrk++;
203 }
204
205
206 cout << " T0 offset selected for this sample : " << fT0Offset << endl;
207 cout << " N. of ESD tracks : " << ntrk << endl;
208 cout << " N. of preselected tracks : " << ngoodtrk << endl;
209 cout << " Minimum tof time in set (in ns) : " << mintime << endl;
210
211 AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk];
212
213 for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) {
214 AliESDtrack *t=tracks[jtrk];
215 Double_t time=t->GetTOFsignal();
216
217 if((time-mintime*1.E3)<50.E3){ // For pp and per
218 gtracks[ngoodtrkt0]=t;
219 ngoodtrkt0++;
220 }
221 }
222
223
224 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
225 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
226 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
227
228 if(ngoodtrkt0<2){
229 cout << "less than 2 tracks, skip event " << endl;
230 t0def=-999;
231 deltat0def=0.600;
232 fT0SigmaT0def[0]=t0def;
233 fT0SigmaT0def[1]=deltat0def;
234 fT0SigmaT0def[2]=ngoodtrkt0;
235 fT0SigmaT0def[3]=ngoodtrkt0;
236 //goto finish;
237 }
238 if(ngoodtrkt0>=2){
239 // Decide how many tracks in set
240 Int_t ntracksinset = min(ngoodtrkt0,nmaxtracksinsetCurrent);
241 Int_t nset=1;
242
243 if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
244
245 cout << " number of sets = " << nset << endl;
246
247 if(strstr(option,"tim") || strstr(option,"all"))gBenchmark->Start("TOFT0v1");
248
249 // Loop over selected sets
250
251 if(nset>=1){
252 for (Int_t i=0; i< nset; i++) {
253
254 Float_t t0best=999.;
255 Float_t Et0best=999.;
256 Float_t chisquarebest=99999.;
257 Int_t npionbest=0;
258
259 Int_t ntracksinsetmy=0;
260 AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset];
261 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
262 Int_t index = itrk+i*ntracksinset;
263 if(index < ngoodtrkt0){
264 AliESDtrack *t=gtracks[index];
265 tracksT0[itrk]=t;
266 ntracksinsetmy++;
267 }
268 }
269
270 // Analyse it
271
272 Int_t assparticle[nmaxtracksinset];
273 Float_t exptof[nmaxtracksinset][3];
274 Float_t timeofflight[nmaxtracksinset];
275 Float_t momentum[nmaxtracksinset];
276 Float_t timezero[nmaxtracksinset];
277 Float_t weightedtimezero[nmaxtracksinset];
278 Float_t beta[nmaxtracksinset];
279 Float_t texp[nmaxtracksinset];
280 Float_t dtexp[nmaxtracksinset];
281 Float_t sqMomError[nmaxtracksinset];
282 Float_t sqTrackError[nmaxtracksinset];
283 Float_t massarray[3]={0.13957,0.493677,0.9382723};
284 Float_t tracktoflen[nmaxtracksinset];
285 Float_t besttimezero[nmaxtracksinset];
286 Float_t besttexp[nmaxtracksinset];
287 Float_t besttimeofflight[nmaxtracksinset];
288 Float_t bestmomentum[nmaxtracksinset];
289 Float_t bestchisquare[nmaxtracksinset];
290 Float_t bestweightedtimezero[nmaxtracksinset];
291 Float_t bestsqTrackError[nmaxtracksinset];
292 Int_t imass[nmaxtracksinset];
293
294 for (Int_t j=0; j<ntracksinset; j++) {
295 assparticle[j] = 3;
296 timeofflight[j] = 0;
297 momentum[j] = 0;
298 timezero[j] = 0;
299 weightedtimezero[j] = 0;
300 beta[j] = 0;
301 texp[j] = 0;
302 dtexp[j] = 0;
303 sqMomError[j] = 0;
304 sqTrackError[j] = 0;
305 tracktoflen[j] = 0;
306 besttimezero[j] = 0;
307 besttexp[j] = 0;
308 besttimeofflight[j] = 0;
309 bestmomentum[j] = 0;
310 bestchisquare[j] = 0;
311 bestweightedtimezero[j] = 0;
312 bestsqTrackError[j] = 0;
313 imass[j] = 1;
314 }
315
316 for (Int_t j=0; j<ntracksinsetmy; j++) {
317 AliESDtrack *t=tracksT0[j];
318 Double_t momOld=t->GetP();
319 Double_t mom=momOld-0.0036*momOld;
320 Double_t time=t->GetTOFsignal();
321
322 time*=1.E-3; // tof given in nanoseconds
323 Double_t exptime[10]; t->GetIntegratedTimes(exptime);
324 Double_t toflen=t->GetIntegratedLength();
325 toflen=toflen/100.; // toflen given in m
326
327 timeofflight[j]=time+fT0Offset;
328 tracktoflen[j]=toflen+fLOffset;
329 exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns
330 exptof[j][1]=exptime[3]*1.E-3+fTimeCorr;
331 exptof[j][2]=exptime[4]*1.E-3+fTimeCorr;
332 momentum[j]=mom;
333 assparticle[j]=3;
334
335 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
336
337 cout << "starting t0 calculation for current set" << endl;
338 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
339 beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0]
340 +momentum[itz]*momentum[itz]);
341 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]));
342 sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns
343 timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns
344 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
345 sumAllweightspi+=1./sqTrackError[itz];
346 meantzeropi+=weightedtimezero[itz];
347 } // end loop for (Int_t itz=0; itz< ntracksinset;itz++)
348
349
350 // Then, Combinatorial Algorithm
351
352 if(ntracksinsetmy<2 )break;
353
354 for (Int_t j=0; j<ntracksinsetmy; j++) {
355 imass[j] = 3;
356 }
357
358 Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
359
360 // Loop on mass hypotheses
361 for (Int_t k=0; k < ncombinatorial;k++) {
362 for (Int_t j=0; j<ntracksinsetmy; j++) {
363 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1));
364 texp[j]=exptof[j][imass[j]];
365 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
366 }
367 Float_t sumAllweights=0.;
368 Float_t meantzero=0.;
369 Float_t Emeantzero=0.;
370
371 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
372 sqTrackError[itz]=
373 (timeresolutioninns*
374 timeresolutioninns
375 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
376
377 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
378
379 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
380 sumAllweights+=1./sqTrackError[itz];
381 meantzero+=weightedtimezero[itz];
382
383 } // end loop for (Int_t itz=0; itz<15;itz++)
384
385 meantzero=meantzero/sumAllweights; // it is given in [ns]
386 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
387
388 // calculate chisquare
389
390 Float_t chisquare=0.;
391 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
392 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
393
394 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
395
396 if(chisquare<=chisquarebest){
397 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
398
399 bestsqTrackError[iqsq]=sqTrackError[iqsq];
400 besttimezero[iqsq]=timezero[iqsq];
401 bestmomentum[iqsq]=momentum[iqsq];
402 besttimeofflight[iqsq]=timeofflight[iqsq];
403 besttexp[iqsq]=texp[iqsq];
404 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
405 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
406 }
407
408 Int_t npion=0;
409 for (Int_t j=0; j<ntracksinsetmy; j++) {
410 assparticle[j]=imass[j];
411 if(imass[j] == 0) npion++;
412 }
413 npionbest=npion;
414 chisquarebest=chisquare;
415 t0best=meantzero;
416 Et0best=Emeantzero;
417 } // close if(dummychisquare<=chisquare)
418
419 }
420
421 Double_t chi2cut[nmaxtracksinset];
422 chi2cut[0] = 0;
423 chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01
424 for (Int_t j=2; j<ntracksinset; j++) {
425 chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.);
426 }
427
428 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
429
430 printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
431
432 Bool_t kRedoT0 = kFALSE;
433 ntracksinsetmyCut = ntracksinsetmy;
434 Bool_t usetrack[nmaxtracksinset];
435 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
436 usetrack[icsq] = kTRUE;
437 if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){
438 kRedoT0 = kTRUE;
439 ntracksinsetmyCut--;
440 usetrack[icsq] = kFALSE;
441 }
442 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
443
444 printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
445
446 // Loop on mass hypotheses Redo
447 if(kRedoT0 && ntracksinsetmyCut > 1){
448 printf("Redo T0\n");
449 for (Int_t k=0; k < ncombinatorial;k++) {
450 for (Int_t j=0; j<ntracksinsetmy; j++) {
451 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1));
452 texp[j]=exptof[j][imass[j]];
453 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
454 }
455
456 Float_t sumAllweights=0.;
457 Float_t meantzero=0.;
458 Float_t Emeantzero=0.;
459
460 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
461 if(! usetrack[itz]) continue;
462 sqTrackError[itz]=
463 (timeresolutioninns*
464 timeresolutioninns
465 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
466
467 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
468
469 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
470 sumAllweights+=1./sqTrackError[itz];
471 meantzero+=weightedtimezero[itz];
472
473 } // end loop for (Int_t itz=0; itz<15;itz++)
474
475 meantzero=meantzero/sumAllweights; // it is given in [ns]
476 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
477
478 // calculate chisquare
479
480 Float_t chisquare=0.;
481 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
482 if(! usetrack[icsq]) continue;
483 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
484
485 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
486
487 Int_t npion=0;
488 for (Int_t j=0; j<ntracksinsetmy; j++) {
489 assparticle[j]=imass[j];
490 if(imass[j] == 0) npion++;
491 }
492
493 if(chisquare<=chisquarebest){
494 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
495 if(! usetrack[iqsq]) continue;
496 bestsqTrackError[iqsq]=sqTrackError[iqsq];
497 besttimezero[iqsq]=timezero[iqsq];
498 bestmomentum[iqsq]=momentum[iqsq];
499 besttimeofflight[iqsq]=timeofflight[iqsq];
500 besttexp[iqsq]=texp[iqsq];
501 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
502 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
503 }
504
505 npionbest=npion;
506 chisquarebest=chisquare;
507 t0best=meantzero;
508 Et0best=Emeantzero;
509 } // close if(dummychisquare<=chisquare)
510
511 }
512 }
513
514 if(chisquarebest >= 999){
515 printf("How is it possible (chi2 = %f)? T0best = %f\n",chisquarebest,t0best);
516
517 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
518 cout << "Track # " << icsq << " T0 offsets = "
519 << besttimezero[icsq]-t0best <<
520 " track error = " << bestsqTrackError[icsq]
521 << " Chisquare = " << bestchisquare[icsq]
522 << " Momentum = " << bestmomentum[icsq]
523 << " TOF = " << besttimeofflight[icsq]
524 << " TOF tracking = " << besttexp[icsq]
525 << " is used = " << usetrack[icsq] << endl;
526 }
527 }
528
529 // filling histos
530 Float_t confLevel=999;
531
532 // Sets with decent chisquares
533
534 if(chisquarebest<999.){
535 Double_t dblechisquare=(Double_t)chisquarebest;
536 confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1);
537 cout << " Set Number " << nsets << endl;
538 cout << "Best Assignment, selection " << assparticle[0] <<
539 assparticle[1] << assparticle[2] <<
540 assparticle[3] << assparticle[4] <<
541 assparticle[5] << endl;
542 cout << " Chisquare of the set "<< chisquarebest <<endl;
543 cout << " C.L. of the set "<< confLevel <<endl;
544 cout << " T0 for this set (in ns) " << t0best << endl;
545
546 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
547
548 if(! usetrack[icsq]) continue;
549
550 cout << "Track # " << icsq << " T0 offsets = "
551 << besttimezero[icsq]-t0best <<
552 " track error = " << bestsqTrackError[icsq]
553 << " Chisquare = " << bestchisquare[icsq]
554 << " Momentum = " << bestmomentum[icsq]
555 << " TOF = " << besttimeofflight[icsq]
556 << " TOF tracking = " << besttexp[icsq]
557 << " is used = " << usetrack[icsq] << endl;
558 }
559
560 // Pick up only those with C.L. >1%
561 // if(confLevel>0.01 && ngoodsetsSel<200){
562 if(confLevel>0.01 && ngoodsetsSel<200){
563 ChisquarebestSel[ngoodsetsSel]=chisquarebest;
564 ConfLevelbestSel[ngoodsetsSel]=confLevel;
565 t0bestSel[ngoodsetsSel]=t0best/Et0best/Et0best;
566 Et0bestSel[ngoodsetsSel]=1./Et0best/Et0best;
567 t0bestallSel += t0best/Et0best/Et0best;
568 sumWt0bestallSel += 1./Et0best/Et0best;
569 ngoodsetsSel++;
570 ngoodtrktrulyused+=ntracksinsetmyCut;
571 }
572 else{
573 printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
574 }
575 }
576 delete[] tracksT0;
577 nsets++;
578
579 } // end for the current set
580
581 NusedTracks = ngoodtrkt0;
582 if(strstr(option,"all")){
583 if(sumAllweightspi>0.){
584 meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns]
585 Emeantzeropi=sqrt(1./sumAllweightspi); // it is given in [ns]
586 }
587
588 if(sumWt0bestallSel>0){
589 t0bestallSel = t0bestallSel/sumWt0bestallSel;
590 Et0bestallSel = sqrt(1./sumWt0bestallSel);
591
592 }// end of if(sumWt0bestallSel>0){
593
594 cout << "T0 all " << t0bestallSel << " +/- " << Et0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
595 }
596
597 t0def=t0bestallSel;
598 deltat0def=Et0bestallSel;
599 if ((t0bestallSel==0)&&(Et0bestallSel==0)){
600 t0def=-999; deltat0def=0.600;
601 }
602
603 fT0SigmaT0def[0]=t0def;
604 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*(ngoodtrktrulyused/(ngoodtrktrulyused-1)));
605 fT0SigmaT0def[2]=ngoodtrkt0;//ngoodtrktrulyused;
606 fT0SigmaT0def[3]=ngoodtrktrulyused;
607 }
608 }
609
610 if(strstr(option,"tim") || strstr(option,"all")){
611 gBenchmark->Stop("TOFT0v1");
612 cout << "AliTOFT0v1:" << endl ;
613 cout << " took " << gBenchmark->GetCpuTime("TOFT0v1") << " seconds in order to calculate T0 " << endl ;
614 }
615 printf("T0 from TOF = %f ns\n",fT0SigmaT0def[0]);
616
617 return fT0SigmaT0def;
618 }
619//__________________________________________________________________
620Double_t * AliTOFT0v1::DefineT0RawCorrection(Option_t *option)
621{
622 Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns]
623
624 const Int_t nmaxtracksinset=10;
625 if(strstr(option,"all")){
626 cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl;
627 cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl;
628 }
629
630 Float_t stripmean = 0;
631
632 Int_t nsets=0;
633 Int_t NusedTracks=0;
634 Int_t ngoodsetsSel= 0;
635 Float_t t0bestSel[300];
636 Float_t Et0bestSel[300];
637 Float_t ChisquarebestSel[300];
638 Float_t ConfLevelbestSel[300];
639 Float_t t0bestallSel=0.;
640 Float_t Et0bestallSel=0.;
641 Float_t sumWt0bestallSel=0.;
642 Float_t Emeantzeropi=0.;
643 Float_t meantzeropi=0.;
644 Float_t sumAllweightspi=0.;
645 Double_t t0def=-999;
646 Double_t deltat0def=999;
647 Int_t ngoodtrktrulyused=0;
648 Int_t ntracksinsetmyCut = 0;
649
650 Int_t ntrk=fEvent->GetNumberOfTracks();
651
652 AliESDtrack **tracks=new AliESDtrack*[ntrk];
653 Int_t ngoodtrk=0;
654 Int_t ngoodtrkt0 =0;
655 Float_t mintime =1E6;
656
657 // First Track loop, Selection of good tracks
658
659 for (Int_t itrk=0; itrk<ntrk; itrk++) {
660 AliESDtrack *t=fEvent->GetTrack(itrk);
661 Double_t momOld=t->GetP();
662 Double_t mom=momOld-0.0036*momOld;
663 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
664 Double_t tot = t->GetTOFsignalToT();
665 Double_t time=t->GetTOFsignalRaw();
666 Int_t chan = t->GetTOFCalChannel();
667 Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0);
668 time -= corr*1000.;
669
670 Int_t crate = fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan);
671 if(crate == 63 || crate == 62){
672 time += 9200;
673 }
674
675 Int_t strip = fCalib->GetCalibMap(AliTOFcalibHisto::kSectorStrip,chan);
676
677 time*=1.E-3; // tof given in nanoseconds
678 if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue;
679
680 AliESDtrackCuts* esdTrackCuts = new AliESDtrackCuts();
681 Bool_t tpcRefit = kTRUE;
682 Double_t nSigma = 4;
683 Bool_t sigmaToVertex = kTRUE;
684 esdTrackCuts->SetRequireSigmaToVertex(sigmaToVertex);
685 if (sigmaToVertex) {
686 esdTrackCuts->SetMaxNsigmaToVertex(nSigma);
687 }
688 else{
689 esdTrackCuts->SetMaxDCAToVertexZ(3.0);
690 esdTrackCuts->SetMaxDCAToVertexXY(3.0);
691 }
692 esdTrackCuts->SetRequireTPCRefit(tpcRefit);
693 esdTrackCuts->SetAcceptKinkDaughters(kFALSE);
694 esdTrackCuts->SetMinNClustersTPC(50);
695 esdTrackCuts->SetMaxChi2PerClusterTPC(3.5);
696 Bool_t accepted;
697 accepted=esdTrackCuts->AcceptTrack(t);
698 if(!accepted) continue;
699
700 if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays
701 if(time <= mintime) mintime=time;
702 tracks[ngoodtrk]=t;
703 ngoodtrk++;
704 stripmean += strip;
705 }
706 if(ngoodtrk) stripmean /= ngoodtrk;
707
708 cout << " T0 offset selected for this sample : " << fT0Offset << endl;
709 cout << " N. of ESD tracks : " << ntrk << endl;
710 cout << " N. of preselected tracks : " << ngoodtrk << endl;
711 cout << " Minimum tof time in set (in ns) : " << mintime << endl;
712
713 AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk];
714
715 for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) {
716 AliESDtrack *t=tracks[jtrk];
717 Double_t tot = t->GetTOFsignalToT();
718 Double_t time=t->GetTOFsignalRaw();
719 Int_t chan = t->GetTOFCalChannel();
720 Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0);
721 time -= corr*1000.;
722
723 Int_t create = fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan);
724 if(create == 63 || create == 62){
725 time += 9200;
726 }
727
728 if((time-mintime*1.E3)<50.E3){ // For pp and per
729 gtracks[ngoodtrkt0]=t;
730 ngoodtrkt0++;
731 }
732 }
733
734 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
735 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
736 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
737
738 if(ngoodtrkt0 > 1){
739 Int_t nlastset = (ngoodtrkt0 % nmaxtracksinsetCurrent);
740
741 while(nlastset-nseteq+1 > 2 ){
742 nmaxtracksinsetCurrent++;
743 nlastset -= nseteq-1;
744 }
745 if(nmaxtracksinsetCurrent > nmaxtracksinset) nmaxtracksinsetCurrent = nmaxtracksinset;
746 }
747
748 if(ngoodtrkt0<2){
749 cout << "less than 2 tracks, skip event " << endl;
750 t0def=-999;
751 deltat0def=0.600;
752 fT0SigmaT0def[0]=t0def;
753 fT0SigmaT0def[1]=deltat0def;
754 fT0SigmaT0def[2]=ngoodtrkt0;
755 fT0SigmaT0def[3]=ngoodtrkt0;
756 //goto finish;
757 }
758 if(ngoodtrkt0>=2){
759 // Decide how many tracks in set
760 Int_t ntracksinset = min(ngoodtrkt0,nmaxtracksinsetCurrent);
761 Int_t nset=1;
762 if(ngoodtrkt0>nmaxtracksinset) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
763
764 cout << " number of sets = " << nset << endl;
765
766 if(strstr(option,"tim") || strstr(option,"all"))gBenchmark->Start("TOFT0v1");
767
768 // Loop over selected sets
769
770 if(nset>=1){
771 for (Int_t i=0; i< nset; i++) {
772
773 Float_t t0best=999.;
774 Float_t Et0best=999.;
775 Float_t chisquarebest=99999.;
776 Int_t npionbest=0;
777
778 Int_t ntracksinsetmy=0;
779 AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset];
780 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
781 Int_t index = itrk+i*ntracksinset;
782 if(index < ngoodtrkt0){
783 AliESDtrack *t=gtracks[index];
784 tracksT0[itrk]=t;
785 ntracksinsetmy++;
786 }
787 }
788
789 // Analyse it
790
791 Int_t assparticle[nmaxtracksinset];
792 Float_t exptof[nmaxtracksinset][3];
793 Float_t timeofflight[nmaxtracksinset];
794 Float_t momentum[nmaxtracksinset];
795 Float_t timezero[nmaxtracksinset];
796 Float_t weightedtimezero[nmaxtracksinset];
797 Float_t beta[nmaxtracksinset];
798 Float_t texp[nmaxtracksinset];
799 Float_t dtexp[nmaxtracksinset];
800 Float_t sqMomError[nmaxtracksinset];
801 Float_t sqTrackError[nmaxtracksinset];
802 Float_t massarray[3]={0.13957,0.493677,0.9382723};
803 Float_t tracktoflen[nmaxtracksinset];
804 Float_t besttimezero[nmaxtracksinset];
805 Float_t besttexp[nmaxtracksinset];
806 Float_t besttimeofflight[nmaxtracksinset];
807 Float_t bestmomentum[nmaxtracksinset];
808 Float_t bestchisquare[nmaxtracksinset];
809 Float_t bestweightedtimezero[nmaxtracksinset];
810 Float_t bestsqTrackError[nmaxtracksinset];
811 Int_t imass[nmaxtracksinset];
812
813 for (Int_t j=0; j<ntracksinset; j++) {
814 assparticle[j] = 3;
815 timeofflight[j] = 0;
816 momentum[j] = 0;
817 timezero[j] = 0;
818 weightedtimezero[j] = 0;
819 beta[j] = 0;
820 texp[j] = 0;
821 dtexp[j] = 0;
822 sqMomError[j] = 0;
823 sqTrackError[j] = 0;
824 tracktoflen[j] = 0;
825 besttimezero[j] = 0;
826 besttexp[j] = 0;
827 besttimeofflight[j] = 0;
828 bestmomentum[j] = 0;
829 bestchisquare[j] = 0;
830 bestweightedtimezero[j] = 0;
831 bestsqTrackError[j] = 0;
832 imass[j] = 1;
833 }
834
835 for (Int_t j=0; j<ntracksinsetmy; j++) {
836 AliESDtrack *t=tracksT0[j];
837 Double_t momOld=t->GetP();
838 Double_t mom=momOld-0.0036*momOld;
839 Double_t tot = t->GetTOFsignalToT();
840 Double_t time=t->GetTOFsignalRaw();
841 Int_t chan = t->GetTOFCalChannel();
842 Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0);
843 time -= corr*1000.;
844
845 Int_t create = fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan);
846 if(create == 63 || create == 62){
847 time += 9200;
848 }
849
850 time*=1.E-3; // tof given in nanoseconds
851 Double_t exptime[10]; t->GetIntegratedTimes(exptime);
852 Double_t toflen=t->GetIntegratedLength();
853 toflen=toflen/100.; // toflen given in m
854
855 timeofflight[j]=time+fT0Offset;
856 tracktoflen[j]=toflen+fLOffset;
857 exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns
858 exptof[j][1]=exptime[3]*1.E-3+fTimeCorr;
859 exptof[j][2]=exptime[4]*1.E-3+fTimeCorr;
860 momentum[j]=mom;
861 assparticle[j]=3;
862
863 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
864
865 cout << "starting t0 calculation for current set" << endl;
866 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
867 beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0]
868 +momentum[itz]*momentum[itz]);
869 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]));
870 sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns
871 timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns
872 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
873 sumAllweightspi+=1./sqTrackError[itz];
874 meantzeropi+=weightedtimezero[itz];
875 } // end loop for (Int_t itz=0; itz< ntracksinset;itz++)
876
877
878 // Then, Combinatorial Algorithm
879
880 if(ntracksinsetmy<2 )break;
881
882 for (Int_t j=0; j<ntracksinsetmy; j++) {
883 imass[j] = 3;
884 }
885
886 Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
887
888 // Loop on mass hypotheses
889 for (Int_t k=0; k < ncombinatorial;k++) {
890 for (Int_t j=0; j<ntracksinsetmy; j++) {
891 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1));
892 texp[j]=exptof[j][imass[j]];
893 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
894 }
895 Float_t sumAllweights=0.;
896 Float_t meantzero=0.;
897 Float_t Emeantzero=0.;
898 Double_t sumAllSquare=0.;
899
900 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
901 sqTrackError[itz]=
902 (timeresolutioninns*
903 timeresolutioninns
904 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
905
906// printf("pt=%f -- TOF res=%f -- track res=%f -- all res=%f\n",momentum[itz],timeresolutioninns,dtexp[itz],TMath::Sqrt(sqTrackError[itz]));
907// getchar();
908 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
909
910 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
911 sumAllSquare += timezero[itz]*timezero[itz];
912 sumAllweights+=1./sqTrackError[itz];
913 meantzero+=weightedtimezero[itz];
914
915 } // end loop for (Int_t itz=0; itz<15;itz++)
916
917 meantzero=meantzero/sumAllweights; // it is given in [ns]
918 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
919
920 //changed
921 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
922 sumAllSquare+= (timezero[itz] - meantzero)*(timezero[itz] - meantzero);
923 }
924 // Emeantzero = TMath::Sqrt(sumAllSquare/ntracksinsetmy);
925
926 // calculate chisquare
927
928 Float_t chisquare=0.;
929 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
930 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
931
932 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
933
934 if(chisquare<=chisquarebest){
935 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
936
937 bestsqTrackError[iqsq]=sqTrackError[iqsq];
938 besttimezero[iqsq]=timezero[iqsq];
939 bestmomentum[iqsq]=momentum[iqsq];
940 besttimeofflight[iqsq]=timeofflight[iqsq];
941 besttexp[iqsq]=texp[iqsq];
942 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
943 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
944 }
945
946 Int_t npion=0;
947 for (Int_t j=0; j<ntracksinsetmy; j++) {
948 assparticle[j]=imass[j];
949 if(imass[j] == 0) npion++;
950 }
951 npionbest=npion;
952 chisquarebest=chisquare;
953 t0best=meantzero;
954 Et0best=Emeantzero;
955 } // close if(dummychisquare<=chisquare)
956
957 }
958
959 Double_t chi2cut[nmaxtracksinset];
960 chi2cut[0] = 0;
961 chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01
962 for (Int_t j=2; j<ntracksinset; j++) {
963 chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.);
964 }
965
966 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
967
968 printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
969
970 Bool_t kRedoT0 = kFALSE;
971 ntracksinsetmyCut = ntracksinsetmy;
972 Bool_t usetrack[nmaxtracksinset];
973 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
974 usetrack[icsq] = kTRUE;
975 if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){
976 kRedoT0 = kTRUE;
977 ntracksinsetmyCut--;
978 usetrack[icsq] = kFALSE;
979 }
980 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
981
982 printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
983
984 // Loop on mass hypotheses Redo
985 if(kRedoT0 && ntracksinsetmyCut > 1){
986 printf("Redo T0\n");
987 for (Int_t k=0; k < ncombinatorial;k++) {
988 for (Int_t j=0; j<ntracksinsetmy; j++) {
989 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1));
990 texp[j]=exptof[j][imass[j]];
991 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
992 }
993
994 Float_t sumAllweights=0.;
995 Float_t meantzero=0.;
996 Float_t Emeantzero=0.;
997 Double_t sumAllSquare=0;
998
999 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
1000 if(! usetrack[itz]) continue;
1001 sqTrackError[itz]=
1002 (timeresolutioninns*
1003 timeresolutioninns
1004 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
1005
1006 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
1007
1008 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
1009 sumAllweights+=1./sqTrackError[itz];
1010 meantzero+=weightedtimezero[itz];
1011 } // end loop for (Int_t itz=0; itz<15;itz++)
1012
1013 meantzero=meantzero/sumAllweights; // it is given in [ns]
1014 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
1015
1016 //changed
1017 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
1018 if(! usetrack[itz]) continue;
1019 sumAllSquare+= (timezero[itz] - meantzero)*(timezero[itz] - meantzero);
1020 }
1021 // Emeantzero = TMath::Sqrt(sumAllSquare/ntracksinsetmyCut);
1022
1023 // calculate chisquare
1024
1025 Float_t chisquare=0.;
1026 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
1027 if(! usetrack[icsq]) continue;
1028 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
1029
1030 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
1031
1032 Int_t npion=0;
1033 for (Int_t j=0; j<ntracksinsetmy; j++) {
1034 assparticle[j]=imass[j];
1035 if(imass[j] == 0) npion++;
1036 }
1037
1038 if(chisquare<=chisquarebest){
1039 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
1040 if(! usetrack[iqsq]) continue;
1041 bestsqTrackError[iqsq]=sqTrackError[iqsq];
1042 besttimezero[iqsq]=timezero[iqsq];
1043 bestmomentum[iqsq]=momentum[iqsq];
1044 besttimeofflight[iqsq]=timeofflight[iqsq];
1045 besttexp[iqsq]=texp[iqsq];
1046 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
1047 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
1048 }
1049
1050 npionbest=npion;
1051 chisquarebest=chisquare;
1052 t0best=meantzero;
1053 Et0best=Emeantzero;
1054 } // close if(dummychisquare<=chisquare)
1055
1056 }
1057 }
1058
1059 if(chisquarebest >= 999){
1060 printf("How is it possible (chi2 = %f)? T0best = %f\n",chisquarebest,t0best);
1061
1062 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
1063 cout << "Track # " << icsq << " T0 offsets = "
1064 << besttimezero[icsq]-t0best <<
1065 " track error = " << bestsqTrackError[icsq]
1066 << " Chisquare = " << bestchisquare[icsq]
1067 << " Momentum = " << bestmomentum[icsq]
1068 << " TOF = " << besttimeofflight[icsq]
1069 << " TOF tracking = " << besttexp[icsq]
1070 << " is used = " << usetrack[icsq] << endl;
1071 }
1072 }
1073
1074 // filling histos
1075 Float_t confLevel=999;
1076
1077 // Sets with decent chisquares
1078
1079 if(chisquarebest<999.){
1080 Double_t dblechisquare=(Double_t)chisquarebest;
1081 confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1);
1082 cout << " Set Number " << nsets << endl;
1083 cout << "Best Assignment, selection " << assparticle[0] <<
1084 assparticle[1] << assparticle[2] <<
1085 assparticle[3] << assparticle[4] <<
1086 assparticle[5] << endl;
1087 cout << " Chisquare of the set "<< chisquarebest <<endl;
1088 cout << " C.L. of the set "<< confLevel <<endl;
1089 cout << " T0 for this set (in ns) " << t0best << endl;
1090 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
1091
1092 if(! usetrack[icsq]) continue;
1093
1094 cout << "Track # " << icsq << " T0 offsets = "
1095 << besttimezero[icsq]-t0best <<
1096 " track error = " << bestsqTrackError[icsq]
1097 << " Chisquare = " << bestchisquare[icsq]
1098 << " Momentum = " << bestmomentum[icsq]
1099 << " TOF = " << besttimeofflight[icsq]
1100 << " TOF tracking = " << besttexp[icsq]
1101 << " is used = " << usetrack[icsq] << endl;
1102 }
1103
1104 // Pick up only those with C.L. >1%
1105 // if(confLevel>0.01 && ngoodsetsSel<200){
1106 if(confLevel>0.01 && ngoodsetsSel<200){
1107 ChisquarebestSel[ngoodsetsSel]=chisquarebest;
1108 ConfLevelbestSel[ngoodsetsSel]=confLevel;
1109 t0bestSel[ngoodsetsSel]=t0best/Et0best/Et0best;
1110 Et0bestSel[ngoodsetsSel]=1./Et0best/Et0best;
1111 t0bestallSel += t0best/Et0best/Et0best;
1112 sumWt0bestallSel += 1./Et0best/Et0best;
1113
1114 ngoodsetsSel++;
1115 ngoodtrktrulyused+=ntracksinsetmyCut;
1116 }
1117 else{
1118 printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
1119 }
1120 }
1121 delete[] tracksT0;
1122 nsets++;
1123
1124 } // end for the current set
1125
1126 NusedTracks = ngoodtrkt0;
1127 if(strstr(option,"all")){
1128 if(sumAllweightspi>0.){
1129 meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns]
1130 Emeantzeropi=sqrt(1./sumAllweightspi); // it is given in [ns]
1131 }
1132
1133 if(sumWt0bestallSel>0){
1134 t0bestallSel = t0bestallSel/sumWt0bestallSel;
1135 Et0bestallSel = sqrt(1./sumWt0bestallSel);
1136 }// end of if(sumWt0bestallSel>0){
1137
1138 cout << "T0 all " << t0bestallSel << " +/- " << Et0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
1139 }
1140
1141 t0def=t0bestallSel;
1142 deltat0def=Et0bestallSel;
1143 if ((t0bestallSel==0)&&(Et0bestallSel==0)){
1144 t0def=-999; deltat0def=0.600;
1145 }
1146
1147 fT0SigmaT0def[0]=t0def;
1148 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*(ngoodtrktrulyused/(ngoodtrktrulyused-1)));
1149 fT0SigmaT0def[2]=ngoodtrkt0;//ngoodtrktrulyused;
1150 fT0SigmaT0def[3]=ngoodtrktrulyused;
1151 }
1152 }
1153
1154 if(strstr(option,"tim") || strstr(option,"all")){
1155 gBenchmark->Stop("TOFT0v1");
1156 cout << "AliTOFT0v1:" << endl ;
1157 cout << " took " << gBenchmark->GetCpuTime("TOFT0v1") << " seconds in order to calculate T0 " << endl ;
1158 }
1159 printf("T0 from TOF = %f ns\n",fT0SigmaT0def[0]);
1160
1161 return fT0SigmaT0def;
1162 }
1163//__________________________________________________________________
1164void AliTOFT0v1::SetTZeroFile(char * file ){
1165 cout << "Destination file : " << file << endl ;
1166 fT0File=file;
1167}
1168//__________________________________________________________________
1169void AliTOFT0v1::Print(Option_t* /*option*/)const
1170{
1171 cout << "------------------- "<< GetName() << " -------------" << endl ;
1172 if(!fT0File.IsNull())
1173 cout << " Writing T0 Distribution to file " << (char*) fT0File.Data() << endl ;
1174}
1175
1176//__________________________________________________________________
1177Bool_t AliTOFT0v1::operator==( AliTOFT0v1 const &tzero )const
1178{
1179 // Equal operator.
1180 //
1181 if( (fTimeResolution==tzero.fTimeResolution)&&(fLowerMomBound==tzero.fLowerMomBound)&&(fUpperMomBound==tzero.fUpperMomBound))
1182 return kTRUE ;
1183 else
1184 return kFALSE ;
1185}
1186
1187
1188//__________________________________________________________________
1189Float_t AliTOFT0v1::GetMomError(Int_t index, Float_t mom, Float_t texp)
1190{
1191 static const Double_t kMasses[]={
1192 0.000511, 0.105658, 0.139570, 0.493677, 0.938272, 1.875613
1193 };
1194
1195 Double_t mass=kMasses[index+2];
1196 Double_t dpp=0.01; //mean relative pt resolution;
1197 Double_t sigma=dpp*texp*1E3/(1.+ mom*mom/(mass*mass));
1198
1199 sigma =TMath::Sqrt(sigma*sigma);
1200
1201 return sigma;
1202}