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