Coding convention violation (RC3): suppression
[u/mrichter/AliRoot.git] / TOF / AliTOFT0v1.cxx
CommitLineData
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;
14b2cbea 178
179 if (!AcceptTrack(t)) continue;
180
10d6f841 181#if 0
14b2cbea 182 /* old code with dependence from libANALYSIS */
536031f2 183 AliESDtrackCuts* esdTrackCuts = new AliESDtrackCuts();
184 Bool_t tpcRefit = kTRUE;
185 Double_t nSigma = 4;
186 Bool_t sigmaToVertex = kTRUE;
187 esdTrackCuts->SetRequireSigmaToVertex(sigmaToVertex);
188 if (sigmaToVertex) {
189 esdTrackCuts->SetMaxNsigmaToVertex(nSigma);
190 }
191 else{
192 esdTrackCuts->SetMaxDCAToVertexZ(3.0);
193 esdTrackCuts->SetMaxDCAToVertexXY(3.0);
194 }
195 esdTrackCuts->SetRequireTPCRefit(tpcRefit);
196 esdTrackCuts->SetAcceptKinkDaughters(kFALSE);
197 esdTrackCuts->SetMinNClustersTPC(50);
198 esdTrackCuts->SetMaxChi2PerClusterTPC(3.5);
199 Bool_t accepted;
200 accepted=esdTrackCuts->AcceptTrack(t);
201 if(!accepted) continue;
10d6f841 202#endif
536031f2 203
204 if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays
205 if(time <= mintime) mintime=time;
206 tracks[ngoodtrk]=t;
207 ngoodtrk++;
208 }
209
210
211 cout << " T0 offset selected for this sample : " << fT0Offset << endl;
212 cout << " N. of ESD tracks : " << ntrk << endl;
213 cout << " N. of preselected tracks : " << ngoodtrk << endl;
214 cout << " Minimum tof time in set (in ns) : " << mintime << endl;
215
216 AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk];
217
218 for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) {
219 AliESDtrack *t=tracks[jtrk];
220 Double_t time=t->GetTOFsignal();
221
222 if((time-mintime*1.E3)<50.E3){ // For pp and per
223 gtracks[ngoodtrkt0]=t;
224 ngoodtrkt0++;
225 }
226 }
227
228
229 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
230 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
231 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
232
233 if(ngoodtrkt0<2){
234 cout << "less than 2 tracks, skip event " << endl;
235 t0def=-999;
236 deltat0def=0.600;
237 fT0SigmaT0def[0]=t0def;
238 fT0SigmaT0def[1]=deltat0def;
239 fT0SigmaT0def[2]=ngoodtrkt0;
240 fT0SigmaT0def[3]=ngoodtrkt0;
241 //goto finish;
242 }
243 if(ngoodtrkt0>=2){
244 // Decide how many tracks in set
245 Int_t ntracksinset = min(ngoodtrkt0,nmaxtracksinsetCurrent);
246 Int_t nset=1;
247
248 if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
249
250 cout << " number of sets = " << nset << endl;
251
252 if(strstr(option,"tim") || strstr(option,"all"))gBenchmark->Start("TOFT0v1");
253
254 // Loop over selected sets
255
256 if(nset>=1){
257 for (Int_t i=0; i< nset; i++) {
258
259 Float_t t0best=999.;
260 Float_t Et0best=999.;
261 Float_t chisquarebest=99999.;
262 Int_t npionbest=0;
263
264 Int_t ntracksinsetmy=0;
265 AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset];
266 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
267 Int_t index = itrk+i*ntracksinset;
268 if(index < ngoodtrkt0){
269 AliESDtrack *t=gtracks[index];
270 tracksT0[itrk]=t;
271 ntracksinsetmy++;
272 }
273 }
274
275 // Analyse it
276
277 Int_t assparticle[nmaxtracksinset];
278 Float_t exptof[nmaxtracksinset][3];
279 Float_t timeofflight[nmaxtracksinset];
280 Float_t momentum[nmaxtracksinset];
281 Float_t timezero[nmaxtracksinset];
282 Float_t weightedtimezero[nmaxtracksinset];
283 Float_t beta[nmaxtracksinset];
284 Float_t texp[nmaxtracksinset];
285 Float_t dtexp[nmaxtracksinset];
286 Float_t sqMomError[nmaxtracksinset];
287 Float_t sqTrackError[nmaxtracksinset];
288 Float_t massarray[3]={0.13957,0.493677,0.9382723};
289 Float_t tracktoflen[nmaxtracksinset];
290 Float_t besttimezero[nmaxtracksinset];
291 Float_t besttexp[nmaxtracksinset];
292 Float_t besttimeofflight[nmaxtracksinset];
293 Float_t bestmomentum[nmaxtracksinset];
294 Float_t bestchisquare[nmaxtracksinset];
295 Float_t bestweightedtimezero[nmaxtracksinset];
296 Float_t bestsqTrackError[nmaxtracksinset];
297 Int_t imass[nmaxtracksinset];
298
299 for (Int_t j=0; j<ntracksinset; j++) {
300 assparticle[j] = 3;
301 timeofflight[j] = 0;
302 momentum[j] = 0;
303 timezero[j] = 0;
304 weightedtimezero[j] = 0;
305 beta[j] = 0;
306 texp[j] = 0;
307 dtexp[j] = 0;
308 sqMomError[j] = 0;
309 sqTrackError[j] = 0;
310 tracktoflen[j] = 0;
311 besttimezero[j] = 0;
312 besttexp[j] = 0;
313 besttimeofflight[j] = 0;
314 bestmomentum[j] = 0;
315 bestchisquare[j] = 0;
316 bestweightedtimezero[j] = 0;
317 bestsqTrackError[j] = 0;
318 imass[j] = 1;
319 }
320
321 for (Int_t j=0; j<ntracksinsetmy; j++) {
322 AliESDtrack *t=tracksT0[j];
323 Double_t momOld=t->GetP();
324 Double_t mom=momOld-0.0036*momOld;
325 Double_t time=t->GetTOFsignal();
326
327 time*=1.E-3; // tof given in nanoseconds
328 Double_t exptime[10]; t->GetIntegratedTimes(exptime);
329 Double_t toflen=t->GetIntegratedLength();
330 toflen=toflen/100.; // toflen given in m
331
332 timeofflight[j]=time+fT0Offset;
333 tracktoflen[j]=toflen+fLOffset;
334 exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns
335 exptof[j][1]=exptime[3]*1.E-3+fTimeCorr;
336 exptof[j][2]=exptime[4]*1.E-3+fTimeCorr;
337 momentum[j]=mom;
338 assparticle[j]=3;
339
340 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
341
342 cout << "starting t0 calculation for current set" << endl;
343 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
344 beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0]
345 +momentum[itz]*momentum[itz]);
346 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]));
347 sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns
348 timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns
349 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
350 sumAllweightspi+=1./sqTrackError[itz];
351 meantzeropi+=weightedtimezero[itz];
352 } // end loop for (Int_t itz=0; itz< ntracksinset;itz++)
353
354
355 // Then, Combinatorial Algorithm
356
357 if(ntracksinsetmy<2 )break;
358
359 for (Int_t j=0; j<ntracksinsetmy; j++) {
360 imass[j] = 3;
361 }
362
363 Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
364
365 // Loop on mass hypotheses
366 for (Int_t k=0; k < ncombinatorial;k++) {
367 for (Int_t j=0; j<ntracksinsetmy; j++) {
368 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1));
369 texp[j]=exptof[j][imass[j]];
370 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
371 }
372 Float_t sumAllweights=0.;
373 Float_t meantzero=0.;
374 Float_t Emeantzero=0.;
375
376 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
377 sqTrackError[itz]=
378 (timeresolutioninns*
379 timeresolutioninns
380 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
381
382 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
383
384 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
385 sumAllweights+=1./sqTrackError[itz];
386 meantzero+=weightedtimezero[itz];
387
388 } // end loop for (Int_t itz=0; itz<15;itz++)
389
390 meantzero=meantzero/sumAllweights; // it is given in [ns]
391 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
392
393 // calculate chisquare
394
395 Float_t chisquare=0.;
396 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
397 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
398
399 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
400
401 if(chisquare<=chisquarebest){
402 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
403
404 bestsqTrackError[iqsq]=sqTrackError[iqsq];
405 besttimezero[iqsq]=timezero[iqsq];
406 bestmomentum[iqsq]=momentum[iqsq];
407 besttimeofflight[iqsq]=timeofflight[iqsq];
408 besttexp[iqsq]=texp[iqsq];
409 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
410 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
411 }
412
413 Int_t npion=0;
414 for (Int_t j=0; j<ntracksinsetmy; j++) {
415 assparticle[j]=imass[j];
416 if(imass[j] == 0) npion++;
417 }
418 npionbest=npion;
419 chisquarebest=chisquare;
420 t0best=meantzero;
421 Et0best=Emeantzero;
422 } // close if(dummychisquare<=chisquare)
423
424 }
425
426 Double_t chi2cut[nmaxtracksinset];
427 chi2cut[0] = 0;
428 chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01
429 for (Int_t j=2; j<ntracksinset; j++) {
430 chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.);
431 }
432
433 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
434
435 printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
436
437 Bool_t kRedoT0 = kFALSE;
438 ntracksinsetmyCut = ntracksinsetmy;
439 Bool_t usetrack[nmaxtracksinset];
440 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
441 usetrack[icsq] = kTRUE;
442 if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){
443 kRedoT0 = kTRUE;
444 ntracksinsetmyCut--;
445 usetrack[icsq] = kFALSE;
446 }
447 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
448
449 printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
450
451 // Loop on mass hypotheses Redo
452 if(kRedoT0 && ntracksinsetmyCut > 1){
453 printf("Redo T0\n");
454 for (Int_t k=0; k < ncombinatorial;k++) {
455 for (Int_t j=0; j<ntracksinsetmy; j++) {
456 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1));
457 texp[j]=exptof[j][imass[j]];
458 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
459 }
460
461 Float_t sumAllweights=0.;
462 Float_t meantzero=0.;
463 Float_t Emeantzero=0.;
464
465 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
466 if(! usetrack[itz]) continue;
467 sqTrackError[itz]=
468 (timeresolutioninns*
469 timeresolutioninns
470 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
471
472 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
473
474 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
475 sumAllweights+=1./sqTrackError[itz];
476 meantzero+=weightedtimezero[itz];
477
478 } // end loop for (Int_t itz=0; itz<15;itz++)
479
480 meantzero=meantzero/sumAllweights; // it is given in [ns]
481 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
482
483 // calculate chisquare
484
485 Float_t chisquare=0.;
486 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
487 if(! usetrack[icsq]) continue;
488 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
489
490 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
491
492 Int_t npion=0;
493 for (Int_t j=0; j<ntracksinsetmy; j++) {
494 assparticle[j]=imass[j];
495 if(imass[j] == 0) npion++;
496 }
497
498 if(chisquare<=chisquarebest){
499 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
500 if(! usetrack[iqsq]) continue;
501 bestsqTrackError[iqsq]=sqTrackError[iqsq];
502 besttimezero[iqsq]=timezero[iqsq];
503 bestmomentum[iqsq]=momentum[iqsq];
504 besttimeofflight[iqsq]=timeofflight[iqsq];
505 besttexp[iqsq]=texp[iqsq];
506 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
507 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
508 }
509
510 npionbest=npion;
511 chisquarebest=chisquare;
512 t0best=meantzero;
513 Et0best=Emeantzero;
514 } // close if(dummychisquare<=chisquare)
515
516 }
517 }
518
519 if(chisquarebest >= 999){
520 printf("How is it possible (chi2 = %f)? T0best = %f\n",chisquarebest,t0best);
521
522 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
523 cout << "Track # " << icsq << " T0 offsets = "
524 << besttimezero[icsq]-t0best <<
525 " track error = " << bestsqTrackError[icsq]
526 << " Chisquare = " << bestchisquare[icsq]
527 << " Momentum = " << bestmomentum[icsq]
528 << " TOF = " << besttimeofflight[icsq]
529 << " TOF tracking = " << besttexp[icsq]
530 << " is used = " << usetrack[icsq] << endl;
531 }
532 }
533
534 // filling histos
535 Float_t confLevel=999;
536
537 // Sets with decent chisquares
538
539 if(chisquarebest<999.){
540 Double_t dblechisquare=(Double_t)chisquarebest;
541 confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1);
542 cout << " Set Number " << nsets << endl;
543 cout << "Best Assignment, selection " << assparticle[0] <<
544 assparticle[1] << assparticle[2] <<
545 assparticle[3] << assparticle[4] <<
546 assparticle[5] << endl;
547 cout << " Chisquare of the set "<< chisquarebest <<endl;
548 cout << " C.L. of the set "<< confLevel <<endl;
549 cout << " T0 for this set (in ns) " << t0best << endl;
550
551 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
552
553 if(! usetrack[icsq]) continue;
554
555 cout << "Track # " << icsq << " T0 offsets = "
556 << besttimezero[icsq]-t0best <<
557 " track error = " << bestsqTrackError[icsq]
558 << " Chisquare = " << bestchisquare[icsq]
559 << " Momentum = " << bestmomentum[icsq]
560 << " TOF = " << besttimeofflight[icsq]
561 << " TOF tracking = " << besttexp[icsq]
562 << " is used = " << usetrack[icsq] << endl;
563 }
564
565 // Pick up only those with C.L. >1%
566 // if(confLevel>0.01 && ngoodsetsSel<200){
567 if(confLevel>0.01 && ngoodsetsSel<200){
568 ChisquarebestSel[ngoodsetsSel]=chisquarebest;
569 ConfLevelbestSel[ngoodsetsSel]=confLevel;
570 t0bestSel[ngoodsetsSel]=t0best/Et0best/Et0best;
571 Et0bestSel[ngoodsetsSel]=1./Et0best/Et0best;
572 t0bestallSel += t0best/Et0best/Et0best;
573 sumWt0bestallSel += 1./Et0best/Et0best;
574 ngoodsetsSel++;
575 ngoodtrktrulyused+=ntracksinsetmyCut;
576 }
577 else{
578 printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
579 }
580 }
581 delete[] tracksT0;
582 nsets++;
583
584 } // end for the current set
585
586 NusedTracks = ngoodtrkt0;
587 if(strstr(option,"all")){
588 if(sumAllweightspi>0.){
589 meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns]
590 Emeantzeropi=sqrt(1./sumAllweightspi); // it is given in [ns]
591 }
592
593 if(sumWt0bestallSel>0){
594 t0bestallSel = t0bestallSel/sumWt0bestallSel;
595 Et0bestallSel = sqrt(1./sumWt0bestallSel);
596
597 }// end of if(sumWt0bestallSel>0){
598
599 cout << "T0 all " << t0bestallSel << " +/- " << Et0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
600 }
601
602 t0def=t0bestallSel;
603 deltat0def=Et0bestallSel;
604 if ((t0bestallSel==0)&&(Et0bestallSel==0)){
605 t0def=-999; deltat0def=0.600;
606 }
607
608 fT0SigmaT0def[0]=t0def;
609 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*(ngoodtrktrulyused/(ngoodtrktrulyused-1)));
610 fT0SigmaT0def[2]=ngoodtrkt0;//ngoodtrktrulyused;
611 fT0SigmaT0def[3]=ngoodtrktrulyused;
612 }
613 }
614
615 if(strstr(option,"tim") || strstr(option,"all")){
616 gBenchmark->Stop("TOFT0v1");
617 cout << "AliTOFT0v1:" << endl ;
618 cout << " took " << gBenchmark->GetCpuTime("TOFT0v1") << " seconds in order to calculate T0 " << endl ;
619 }
620 printf("T0 from TOF = %f ns\n",fT0SigmaT0def[0]);
621
622 return fT0SigmaT0def;
623 }
624//__________________________________________________________________
625Double_t * AliTOFT0v1::DefineT0RawCorrection(Option_t *option)
626{
627 Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns]
628
629 const Int_t nmaxtracksinset=10;
630 if(strstr(option,"all")){
631 cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl;
632 cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl;
633 }
634
635 Float_t stripmean = 0;
636
637 Int_t nsets=0;
638 Int_t NusedTracks=0;
639 Int_t ngoodsetsSel= 0;
640 Float_t t0bestSel[300];
641 Float_t Et0bestSel[300];
642 Float_t ChisquarebestSel[300];
643 Float_t ConfLevelbestSel[300];
644 Float_t t0bestallSel=0.;
645 Float_t Et0bestallSel=0.;
646 Float_t sumWt0bestallSel=0.;
647 Float_t Emeantzeropi=0.;
648 Float_t meantzeropi=0.;
649 Float_t sumAllweightspi=0.;
650 Double_t t0def=-999;
651 Double_t deltat0def=999;
652 Int_t ngoodtrktrulyused=0;
653 Int_t ntracksinsetmyCut = 0;
654
655 Int_t ntrk=fEvent->GetNumberOfTracks();
656
657 AliESDtrack **tracks=new AliESDtrack*[ntrk];
658 Int_t ngoodtrk=0;
659 Int_t ngoodtrkt0 =0;
660 Float_t mintime =1E6;
661
662 // First Track loop, Selection of good tracks
663
664 for (Int_t itrk=0; itrk<ntrk; itrk++) {
665 AliESDtrack *t=fEvent->GetTrack(itrk);
666 Double_t momOld=t->GetP();
667 Double_t mom=momOld-0.0036*momOld;
668 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
669 Double_t tot = t->GetTOFsignalToT();
670 Double_t time=t->GetTOFsignalRaw();
671 Int_t chan = t->GetTOFCalChannel();
672 Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0);
673 time -= corr*1000.;
674
675 Int_t crate = fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan);
676 if(crate == 63 || crate == 62){
677 time += 9200;
678 }
679
680 Int_t strip = fCalib->GetCalibMap(AliTOFcalibHisto::kSectorStrip,chan);
681
682 time*=1.E-3; // tof given in nanoseconds
683 if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue;
14b2cbea 684
685 if (!AcceptTrack(t)) continue;
686
10d6f841 687#if 0
14b2cbea 688 /* old code with dependence from libANALYSIS */
536031f2 689 AliESDtrackCuts* esdTrackCuts = new AliESDtrackCuts();
690 Bool_t tpcRefit = kTRUE;
691 Double_t nSigma = 4;
692 Bool_t sigmaToVertex = kTRUE;
693 esdTrackCuts->SetRequireSigmaToVertex(sigmaToVertex);
694 if (sigmaToVertex) {
695 esdTrackCuts->SetMaxNsigmaToVertex(nSigma);
696 }
697 else{
698 esdTrackCuts->SetMaxDCAToVertexZ(3.0);
699 esdTrackCuts->SetMaxDCAToVertexXY(3.0);
700 }
701 esdTrackCuts->SetRequireTPCRefit(tpcRefit);
702 esdTrackCuts->SetAcceptKinkDaughters(kFALSE);
703 esdTrackCuts->SetMinNClustersTPC(50);
704 esdTrackCuts->SetMaxChi2PerClusterTPC(3.5);
705 Bool_t accepted;
706 accepted=esdTrackCuts->AcceptTrack(t);
707 if(!accepted) continue;
10d6f841 708#endif
536031f2 709
710 if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays
711 if(time <= mintime) mintime=time;
712 tracks[ngoodtrk]=t;
713 ngoodtrk++;
714 stripmean += strip;
715 }
716 if(ngoodtrk) stripmean /= ngoodtrk;
717
718 cout << " T0 offset selected for this sample : " << fT0Offset << endl;
719 cout << " N. of ESD tracks : " << ntrk << endl;
720 cout << " N. of preselected tracks : " << ngoodtrk << endl;
721 cout << " Minimum tof time in set (in ns) : " << mintime << endl;
722
723 AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk];
724
725 for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) {
726 AliESDtrack *t=tracks[jtrk];
727 Double_t tot = t->GetTOFsignalToT();
728 Double_t time=t->GetTOFsignalRaw();
729 Int_t chan = t->GetTOFCalChannel();
730 Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0);
731 time -= corr*1000.;
732
733 Int_t create = fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan);
734 if(create == 63 || create == 62){
735 time += 9200;
736 }
737
738 if((time-mintime*1.E3)<50.E3){ // For pp and per
739 gtracks[ngoodtrkt0]=t;
740 ngoodtrkt0++;
741 }
742 }
743
744 Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1;
745 Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq;
746 if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++;
747
748 if(ngoodtrkt0 > 1){
749 Int_t nlastset = (ngoodtrkt0 % nmaxtracksinsetCurrent);
750
751 while(nlastset-nseteq+1 > 2 ){
752 nmaxtracksinsetCurrent++;
753 nlastset -= nseteq-1;
754 }
755 if(nmaxtracksinsetCurrent > nmaxtracksinset) nmaxtracksinsetCurrent = nmaxtracksinset;
756 }
757
758 if(ngoodtrkt0<2){
759 cout << "less than 2 tracks, skip event " << endl;
760 t0def=-999;
761 deltat0def=0.600;
762 fT0SigmaT0def[0]=t0def;
763 fT0SigmaT0def[1]=deltat0def;
764 fT0SigmaT0def[2]=ngoodtrkt0;
765 fT0SigmaT0def[3]=ngoodtrkt0;
766 //goto finish;
767 }
768 if(ngoodtrkt0>=2){
769 // Decide how many tracks in set
770 Int_t ntracksinset = min(ngoodtrkt0,nmaxtracksinsetCurrent);
771 Int_t nset=1;
772 if(ngoodtrkt0>nmaxtracksinset) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;}
773
774 cout << " number of sets = " << nset << endl;
775
776 if(strstr(option,"tim") || strstr(option,"all"))gBenchmark->Start("TOFT0v1");
777
778 // Loop over selected sets
779
780 if(nset>=1){
781 for (Int_t i=0; i< nset; i++) {
782
783 Float_t t0best=999.;
784 Float_t Et0best=999.;
785 Float_t chisquarebest=99999.;
786 Int_t npionbest=0;
787
788 Int_t ntracksinsetmy=0;
789 AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset];
790 for (Int_t itrk=0; itrk<ntracksinset; itrk++) {
791 Int_t index = itrk+i*ntracksinset;
792 if(index < ngoodtrkt0){
793 AliESDtrack *t=gtracks[index];
794 tracksT0[itrk]=t;
795 ntracksinsetmy++;
796 }
797 }
798
799 // Analyse it
800
801 Int_t assparticle[nmaxtracksinset];
802 Float_t exptof[nmaxtracksinset][3];
803 Float_t timeofflight[nmaxtracksinset];
804 Float_t momentum[nmaxtracksinset];
805 Float_t timezero[nmaxtracksinset];
806 Float_t weightedtimezero[nmaxtracksinset];
807 Float_t beta[nmaxtracksinset];
808 Float_t texp[nmaxtracksinset];
809 Float_t dtexp[nmaxtracksinset];
810 Float_t sqMomError[nmaxtracksinset];
811 Float_t sqTrackError[nmaxtracksinset];
812 Float_t massarray[3]={0.13957,0.493677,0.9382723};
813 Float_t tracktoflen[nmaxtracksinset];
814 Float_t besttimezero[nmaxtracksinset];
815 Float_t besttexp[nmaxtracksinset];
816 Float_t besttimeofflight[nmaxtracksinset];
817 Float_t bestmomentum[nmaxtracksinset];
818 Float_t bestchisquare[nmaxtracksinset];
819 Float_t bestweightedtimezero[nmaxtracksinset];
820 Float_t bestsqTrackError[nmaxtracksinset];
821 Int_t imass[nmaxtracksinset];
822
823 for (Int_t j=0; j<ntracksinset; j++) {
824 assparticle[j] = 3;
825 timeofflight[j] = 0;
826 momentum[j] = 0;
827 timezero[j] = 0;
828 weightedtimezero[j] = 0;
829 beta[j] = 0;
830 texp[j] = 0;
831 dtexp[j] = 0;
832 sqMomError[j] = 0;
833 sqTrackError[j] = 0;
834 tracktoflen[j] = 0;
835 besttimezero[j] = 0;
836 besttexp[j] = 0;
837 besttimeofflight[j] = 0;
838 bestmomentum[j] = 0;
839 bestchisquare[j] = 0;
840 bestweightedtimezero[j] = 0;
841 bestsqTrackError[j] = 0;
842 imass[j] = 1;
843 }
844
845 for (Int_t j=0; j<ntracksinsetmy; j++) {
846 AliESDtrack *t=tracksT0[j];
847 Double_t momOld=t->GetP();
848 Double_t mom=momOld-0.0036*momOld;
849 Double_t tot = t->GetTOFsignalToT();
850 Double_t time=t->GetTOFsignalRaw();
851 Int_t chan = t->GetTOFCalChannel();
852 Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0);
853 time -= corr*1000.;
854
855 Int_t create = fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan);
856 if(create == 63 || create == 62){
857 time += 9200;
858 }
859
860 time*=1.E-3; // tof given in nanoseconds
861 Double_t exptime[10]; t->GetIntegratedTimes(exptime);
862 Double_t toflen=t->GetIntegratedLength();
863 toflen=toflen/100.; // toflen given in m
864
865 timeofflight[j]=time+fT0Offset;
866 tracktoflen[j]=toflen+fLOffset;
867 exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns
868 exptof[j][1]=exptime[3]*1.E-3+fTimeCorr;
869 exptof[j][2]=exptime[4]*1.E-3+fTimeCorr;
870 momentum[j]=mom;
871 assparticle[j]=3;
872
873 } //end for (Int_t j=0; j<ntracksinsetmy; j++) {
874
875 cout << "starting t0 calculation for current set" << endl;
876 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
877 beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0]
878 +momentum[itz]*momentum[itz]);
879 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]));
880 sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns
881 timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns
882 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
883 sumAllweightspi+=1./sqTrackError[itz];
884 meantzeropi+=weightedtimezero[itz];
885 } // end loop for (Int_t itz=0; itz< ntracksinset;itz++)
886
887
888 // Then, Combinatorial Algorithm
889
890 if(ntracksinsetmy<2 )break;
891
892 for (Int_t j=0; j<ntracksinsetmy; j++) {
893 imass[j] = 3;
894 }
895
896 Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy));
897
898 // Loop on mass hypotheses
899 for (Int_t k=0; k < ncombinatorial;k++) {
900 for (Int_t j=0; j<ntracksinsetmy; j++) {
901 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1));
902 texp[j]=exptof[j][imass[j]];
903 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
904 }
905 Float_t sumAllweights=0.;
906 Float_t meantzero=0.;
907 Float_t Emeantzero=0.;
908 Double_t sumAllSquare=0.;
909
910 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
911 sqTrackError[itz]=
912 (timeresolutioninns*
913 timeresolutioninns
914 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
915
916// printf("pt=%f -- TOF res=%f -- track res=%f -- all res=%f\n",momentum[itz],timeresolutioninns,dtexp[itz],TMath::Sqrt(sqTrackError[itz]));
917// getchar();
918 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
919
920 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
921 sumAllSquare += timezero[itz]*timezero[itz];
922 sumAllweights+=1./sqTrackError[itz];
923 meantzero+=weightedtimezero[itz];
924
925 } // end loop for (Int_t itz=0; itz<15;itz++)
926
927 meantzero=meantzero/sumAllweights; // it is given in [ns]
928 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
929
930 //changed
931 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
932 sumAllSquare+= (timezero[itz] - meantzero)*(timezero[itz] - meantzero);
933 }
934 // Emeantzero = TMath::Sqrt(sumAllSquare/ntracksinsetmy);
935
936 // calculate chisquare
937
938 Float_t chisquare=0.;
939 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
940 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
941
942 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
943
944 if(chisquare<=chisquarebest){
945 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
946
947 bestsqTrackError[iqsq]=sqTrackError[iqsq];
948 besttimezero[iqsq]=timezero[iqsq];
949 bestmomentum[iqsq]=momentum[iqsq];
950 besttimeofflight[iqsq]=timeofflight[iqsq];
951 besttexp[iqsq]=texp[iqsq];
952 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
953 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
954 }
955
956 Int_t npion=0;
957 for (Int_t j=0; j<ntracksinsetmy; j++) {
958 assparticle[j]=imass[j];
959 if(imass[j] == 0) npion++;
960 }
961 npionbest=npion;
962 chisquarebest=chisquare;
963 t0best=meantzero;
964 Et0best=Emeantzero;
965 } // close if(dummychisquare<=chisquare)
966
967 }
968
969 Double_t chi2cut[nmaxtracksinset];
970 chi2cut[0] = 0;
971 chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01
972 for (Int_t j=2; j<ntracksinset; j++) {
973 chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.);
974 }
975
976 Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy;
977
978 printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]);
979
980 Bool_t kRedoT0 = kFALSE;
981 ntracksinsetmyCut = ntracksinsetmy;
982 Bool_t usetrack[nmaxtracksinset];
983 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
984 usetrack[icsq] = kTRUE;
985 if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){
986 kRedoT0 = kTRUE;
987 ntracksinsetmyCut--;
988 usetrack[icsq] = kFALSE;
989 }
990 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
991
992 printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut);
993
994 // Loop on mass hypotheses Redo
995 if(kRedoT0 && ntracksinsetmyCut > 1){
996 printf("Redo T0\n");
997 for (Int_t k=0; k < ncombinatorial;k++) {
998 for (Int_t j=0; j<ntracksinsetmy; j++) {
999 imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1));
1000 texp[j]=exptof[j][imass[j]];
1001 dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]);
1002 }
1003
1004 Float_t sumAllweights=0.;
1005 Float_t meantzero=0.;
1006 Float_t Emeantzero=0.;
1007 Double_t sumAllSquare=0;
1008
1009 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
1010 if(! usetrack[itz]) continue;
1011 sqTrackError[itz]=
1012 (timeresolutioninns*
1013 timeresolutioninns
1014 +dtexp[itz]*dtexp[itz]*1E-6); //in ns2
1015
1016 timezero[itz]=texp[itz]-timeofflight[itz];// in ns
1017
1018 weightedtimezero[itz]=timezero[itz]/sqTrackError[itz];
1019 sumAllweights+=1./sqTrackError[itz];
1020 meantzero+=weightedtimezero[itz];
1021 } // end loop for (Int_t itz=0; itz<15;itz++)
1022
1023 meantzero=meantzero/sumAllweights; // it is given in [ns]
1024 Emeantzero=sqrt(1./sumAllweights); // it is given in [ns]
1025
1026 //changed
1027 for (Int_t itz=0; itz<ntracksinsetmy;itz++) {
1028 if(! usetrack[itz]) continue;
1029 sumAllSquare+= (timezero[itz] - meantzero)*(timezero[itz] - meantzero);
1030 }
1031 // Emeantzero = TMath::Sqrt(sumAllSquare/ntracksinsetmyCut);
1032
1033 // calculate chisquare
1034
1035 Float_t chisquare=0.;
1036 for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) {
1037 if(! usetrack[icsq]) continue;
1038 chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
1039
1040 } // end loop for (Int_t icsq=0; icsq<15;icsq++)
1041
1042 Int_t npion=0;
1043 for (Int_t j=0; j<ntracksinsetmy; j++) {
1044 assparticle[j]=imass[j];
1045 if(imass[j] == 0) npion++;
1046 }
1047
1048 if(chisquare<=chisquarebest){
1049 for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) {
1050 if(! usetrack[iqsq]) continue;
1051 bestsqTrackError[iqsq]=sqTrackError[iqsq];
1052 besttimezero[iqsq]=timezero[iqsq];
1053 bestmomentum[iqsq]=momentum[iqsq];
1054 besttimeofflight[iqsq]=timeofflight[iqsq];
1055 besttexp[iqsq]=texp[iqsq];
1056 bestweightedtimezero[iqsq]=weightedtimezero[iqsq];
1057 bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq];
1058 }
1059
1060 npionbest=npion;
1061 chisquarebest=chisquare;
1062 t0best=meantzero;
1063 Et0best=Emeantzero;
1064 } // close if(dummychisquare<=chisquare)
1065
1066 }
1067 }
1068
1069 if(chisquarebest >= 999){
1070 printf("How is it possible (chi2 = %f)? T0best = %f\n",chisquarebest,t0best);
1071
1072 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
1073 cout << "Track # " << icsq << " T0 offsets = "
1074 << besttimezero[icsq]-t0best <<
1075 " track error = " << bestsqTrackError[icsq]
1076 << " Chisquare = " << bestchisquare[icsq]
1077 << " Momentum = " << bestmomentum[icsq]
1078 << " TOF = " << besttimeofflight[icsq]
1079 << " TOF tracking = " << besttexp[icsq]
1080 << " is used = " << usetrack[icsq] << endl;
1081 }
1082 }
1083
1084 // filling histos
1085 Float_t confLevel=999;
1086
1087 // Sets with decent chisquares
1088
1089 if(chisquarebest<999.){
1090 Double_t dblechisquare=(Double_t)chisquarebest;
1091 confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1);
1092 cout << " Set Number " << nsets << endl;
1093 cout << "Best Assignment, selection " << assparticle[0] <<
1094 assparticle[1] << assparticle[2] <<
1095 assparticle[3] << assparticle[4] <<
1096 assparticle[5] << endl;
1097 cout << " Chisquare of the set "<< chisquarebest <<endl;
1098 cout << " C.L. of the set "<< confLevel <<endl;
1099 cout << " T0 for this set (in ns) " << t0best << endl;
1100 for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){
1101
1102 if(! usetrack[icsq]) continue;
1103
1104 cout << "Track # " << icsq << " T0 offsets = "
1105 << besttimezero[icsq]-t0best <<
1106 " track error = " << bestsqTrackError[icsq]
1107 << " Chisquare = " << bestchisquare[icsq]
1108 << " Momentum = " << bestmomentum[icsq]
1109 << " TOF = " << besttimeofflight[icsq]
1110 << " TOF tracking = " << besttexp[icsq]
1111 << " is used = " << usetrack[icsq] << endl;
1112 }
1113
1114 // Pick up only those with C.L. >1%
1115 // if(confLevel>0.01 && ngoodsetsSel<200){
1116 if(confLevel>0.01 && ngoodsetsSel<200){
1117 ChisquarebestSel[ngoodsetsSel]=chisquarebest;
1118 ConfLevelbestSel[ngoodsetsSel]=confLevel;
1119 t0bestSel[ngoodsetsSel]=t0best/Et0best/Et0best;
1120 Et0bestSel[ngoodsetsSel]=1./Et0best/Et0best;
1121 t0bestallSel += t0best/Et0best/Et0best;
1122 sumWt0bestallSel += 1./Et0best/Et0best;
1123
1124 ngoodsetsSel++;
1125 ngoodtrktrulyused+=ntracksinsetmyCut;
1126 }
1127 else{
1128 printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy);
1129 }
1130 }
1131 delete[] tracksT0;
1132 nsets++;
1133
1134 } // end for the current set
1135
1136 NusedTracks = ngoodtrkt0;
1137 if(strstr(option,"all")){
1138 if(sumAllweightspi>0.){
1139 meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns]
1140 Emeantzeropi=sqrt(1./sumAllweightspi); // it is given in [ns]
1141 }
1142
1143 if(sumWt0bestallSel>0){
1144 t0bestallSel = t0bestallSel/sumWt0bestallSel;
1145 Et0bestallSel = sqrt(1./sumWt0bestallSel);
1146 }// end of if(sumWt0bestallSel>0){
1147
1148 cout << "T0 all " << t0bestallSel << " +/- " << Et0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl;
1149 }
1150
1151 t0def=t0bestallSel;
1152 deltat0def=Et0bestallSel;
1153 if ((t0bestallSel==0)&&(Et0bestallSel==0)){
1154 t0def=-999; deltat0def=0.600;
1155 }
1156
1157 fT0SigmaT0def[0]=t0def;
1158 fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*(ngoodtrktrulyused/(ngoodtrktrulyused-1)));
1159 fT0SigmaT0def[2]=ngoodtrkt0;//ngoodtrktrulyused;
1160 fT0SigmaT0def[3]=ngoodtrktrulyused;
1161 }
1162 }
1163
1164 if(strstr(option,"tim") || strstr(option,"all")){
1165 gBenchmark->Stop("TOFT0v1");
1166 cout << "AliTOFT0v1:" << endl ;
1167 cout << " took " << gBenchmark->GetCpuTime("TOFT0v1") << " seconds in order to calculate T0 " << endl ;
1168 }
1169 printf("T0 from TOF = %f ns\n",fT0SigmaT0def[0]);
1170
1171 return fT0SigmaT0def;
1172 }
1173//__________________________________________________________________
1174void AliTOFT0v1::SetTZeroFile(char * file ){
1175 cout << "Destination file : " << file << endl ;
1176 fT0File=file;
1177}
1178//__________________________________________________________________
1179void AliTOFT0v1::Print(Option_t* /*option*/)const
1180{
1181 cout << "------------------- "<< GetName() << " -------------" << endl ;
1182 if(!fT0File.IsNull())
1183 cout << " Writing T0 Distribution to file " << (char*) fT0File.Data() << endl ;
1184}
1185
1186//__________________________________________________________________
1187Bool_t AliTOFT0v1::operator==( AliTOFT0v1 const &tzero )const
1188{
1189 // Equal operator.
1190 //
1191 if( (fTimeResolution==tzero.fTimeResolution)&&(fLowerMomBound==tzero.fLowerMomBound)&&(fUpperMomBound==tzero.fUpperMomBound))
1192 return kTRUE ;
1193 else
1194 return kFALSE ;
1195}
1196
1197
1198//__________________________________________________________________
1199Float_t AliTOFT0v1::GetMomError(Int_t index, Float_t mom, Float_t texp)
1200{
1201 static const Double_t kMasses[]={
1202 0.000511, 0.105658, 0.139570, 0.493677, 0.938272, 1.875613
1203 };
1204
1205 Double_t mass=kMasses[index+2];
1206 Double_t dpp=0.01; //mean relative pt resolution;
1207 Double_t sigma=dpp*texp*1E3/(1.+ mom*mom/(mass*mass));
1208
1209 sigma =TMath::Sqrt(sigma*sigma);
1210
1211 return sigma;
1212}
14b2cbea 1213
1214//__________________________________________________________________
1215Bool_t AliTOFT0v1::AcceptTrack(AliESDtrack *track)
1216{
1217
1218 /* TPC refit */
1219 if (!(track->GetStatus() & AliESDtrack::kTPCrefit)) return kFALSE;
1220 /* do not accept kink daughters */
1221 if (track->GetKinkIndex(0)>0) return kFALSE;
1222 /* N clusters TPC */
1223 if (track->GetTPCclusters(0) < 50) return kFALSE;
1224 /* chi2 TPC */
1225 if (track->GetTPCchi2()/Float_t(track->GetTPCclusters(0)) > 3.5) return kFALSE;
1226 /* sigma to vertex */
1227 if (GetSigmaToVertex(track) > 4.) return kFALSE;
1228
1229 /* accept track */
1230 return kTRUE;
1231
1232}
1233
1234//____________________________________________________________________
1235Float_t AliTOFT0v1::GetSigmaToVertex(AliESDtrack* esdTrack)
1236{
1237 // Calculates the number of sigma to the vertex.
1238
1239 Float_t b[2];
1240 Float_t bRes[2];
1241 Float_t bCov[3];
1242 esdTrack->GetImpactParameters(b,bCov);
1243
1244 if (bCov[0]<=0 || bCov[2]<=0) {
1245 bCov[0]=0; bCov[2]=0;
1246 }
1247 bRes[0] = TMath::Sqrt(bCov[0]);
1248 bRes[1] = TMath::Sqrt(bCov[2]);
1249
1250 // -----------------------------------
1251 // How to get to a n-sigma cut?
1252 //
1253 // The accumulated statistics from 0 to d is
1254 //
1255 // -> Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma)
1256 // -> 1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma)
1257 //
1258 // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-d**2)/2)
1259 // Can this be expressed in a different way?
1260
1261 if (bRes[0] == 0 || bRes[1] ==0)
1262 return -1;
1263
1264 Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));
1265
1266 // work around precision problem
1267 // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :(
1268 // 1e-15 corresponds to nsigma ~ 7.7
1269 if (TMath::Exp(-d * d / 2) < 1e-15)
1270 return 1000;
1271
1272 Float_t nSigma = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
1273 return nSigma;
1274}