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536031f2 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
6a4e212e | 16 | /* $Id: AliTOFT0v1.cxx,v 1.8 2010/01/19 16:32:20 noferini Exp $ */ |
536031f2 | 17 | |
18 | //_________________________________________________________________________ | |
19 | // This is a TTask that made the calculation of the Time zero using TOF. | |
20 | // Description: The algorithm used to calculate the time zero of interaction | |
21 | // using TOF detector is the following. | |
6a4e212e | 22 | // We select in the ESD some "primary" particles - or tracks in the following - |
536031f2 | 23 | // that strike the TOF detector (the larger part are pions, kaons or protons). |
24 | // We choose a set of 10 selected tracks, for each track You have the length | |
6a4e212e | 25 | // of the track when the TOF is reached, |
26 | // the momentum and the time of flight | |
536031f2 | 27 | // given by the TOF detector. |
536031f2 | 28 | // Let consider now only one set of 10 tracks (the algorithm is the same for all sets). |
29 | // Assuming the (mass) hypothesis that each track can be AUT a pion, AUT a kaon, AUT a proton, | |
30 | // we consider all the 3 at 10 possible cases. | |
31 | // For each track in each (mass) configuration | |
32 | // (a configuration can be e.g. pion/pion/kaon/proton/pion/proton/kaon/kaon/pion/pion) | |
33 | // we calculate the time zero (we know in fact the velocity of the track after | |
34 | // the assumption about its mass, the time of flight given by the TOF, and the | |
35 | // corresponding path travelled till the TOF detector). Then for each mass configuration we have | |
36 | // 10 time zero and we can calculate the ChiSquare for the current configuration using the | |
37 | // weighted mean over all 10 time zero. | |
38 | // We call the best assignment the mass configuration that gives the minimum value of the ChiSquare. | |
39 | // We plot the weighted mean over all 10 time zero for the best assignment, | |
40 | // the ChiSquare for the best assignment and the corresponding confidence level. | |
41 | // The strong assumption is the MC selection of primary particles. It will be introduced | |
42 | // in the future also some more realistic simulation about this point. | |
43 | // Use case: | |
44 | // root [0] AliTOFT0v1 * tzero = new AliTOFT0v1("galice.root") | |
45 | // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated | |
46 | // root [1] tzero->ExecuteTask() | |
47 | // root [2] tzero->ExecuteTask("tim") | |
48 | // // available parameters: | |
49 | // tim - print benchmarking information | |
50 | // all - print usefull informations about the number of misidentified tracks | |
51 | // and a comparison about the true configuration (known from MC) and the best | |
52 | // assignment | |
53 | // Different Selections for pp and Pb-Pb: Momentum Range, Max Time, # pions | |
54 | //-- Author: F. Pierella | |
6a4e212e | 55 | //-- Mod By Silvia Arcelli, Francesco Noferini, Barbara Guerzoni |
536031f2 | 56 | ////////////////////////////////////////////////////////////////////////////// |
57 | ||
8f589502 | 58 | #include "Riostream.h" |
536031f2 | 59 | |
536031f2 | 60 | #include "AliTOFT0v1.h" |
536031f2 | 61 | #include "AliESDtrack.h" |
536031f2 | 62 | #include "AliTOFcalibHisto.h" |
8f589502 | 63 | #include "AliESDEvent.h" |
536031f2 | 64 | |
65 | ClassImp(AliTOFT0v1) | |
66 | ||
67 | //____________________________________________________________________________ | |
8f589502 | 68 | AliTOFT0v1::AliTOFT0v1(): |
69 | fLowerMomBound(0.4), | |
70 | fUpperMomBound(2.0), | |
71 | fTimeResolution(0.80e-10), | |
72 | fTimeCorr(0.), | |
73 | fEvent(0x0), | |
74 | fCalib(0x0) | |
536031f2 | 75 | { |
8f589502 | 76 | // |
77 | // default constructor | |
78 | // | |
79 | ||
536031f2 | 80 | fT0SigmaT0def[0]=-999.; |
81 | fT0SigmaT0def[1]=999.; | |
82 | fT0SigmaT0def[2]=-999.; | |
83 | fT0SigmaT0def[3]=-999.; | |
84 | ||
8f589502 | 85 | } |
86 | ||
87 | ||
88 | //____________________________________________________________________________ | |
89 | AliTOFT0v1::AliTOFT0v1(AliESDEvent* event): | |
90 | fLowerMomBound(0.4), | |
91 | fUpperMomBound(2.0), | |
92 | fTimeResolution(0.80e-10), | |
93 | fTimeCorr(0.), | |
94 | fEvent(event), | |
95 | fCalib(0x0) | |
96 | { | |
97 | // | |
98 | // real constructor | |
99 | // | |
100 | ||
101 | fT0SigmaT0def[0]=-999.; | |
102 | fT0SigmaT0def[1]= 999.; | |
103 | fT0SigmaT0def[2]=-999.; | |
104 | fT0SigmaT0def[3]=-999.; | |
105 | ||
536031f2 | 106 | } |
107 | ||
108 | //____________________________________________________________________________ | |
8f589502 | 109 | AliTOFT0v1::AliTOFT0v1(const AliTOFT0v1 & tzero): |
110 | TObject(), | |
111 | fLowerMomBound(tzero.fLowerMomBound), | |
112 | fUpperMomBound(tzero.fUpperMomBound), | |
113 | fTimeResolution(tzero.fTimeResolution), | |
114 | fTimeCorr(tzero.fTimeCorr), | |
115 | fEvent(tzero.fEvent), | |
116 | fCalib(tzero.fCalib) | |
536031f2 | 117 | { |
8f589502 | 118 | // |
119 | // copy constructor | |
120 | // | |
121 | ||
122 | fT0SigmaT0def[0]=tzero.fT0SigmaT0def[0]; | |
123 | fT0SigmaT0def[1]=tzero.fT0SigmaT0def[1]; | |
124 | fT0SigmaT0def[2]=tzero.fT0SigmaT0def[2]; | |
125 | fT0SigmaT0def[3]=tzero.fT0SigmaT0def[3]; | |
126 | ||
536031f2 | 127 | } |
128 | ||
8f589502 | 129 | //____________________________________________________________________________ |
130 | AliTOFT0v1& AliTOFT0v1::operator=(const AliTOFT0v1 &tzero) | |
131 | { | |
132 | // | |
133 | // assign. operator | |
134 | // | |
135 | ||
136 | if (this == &tzero) | |
137 | return *this; | |
138 | ||
139 | fLowerMomBound=tzero.fLowerMomBound; | |
140 | fUpperMomBound=tzero.fUpperMomBound; | |
141 | fTimeResolution=tzero.fTimeResolution; | |
142 | fTimeCorr=tzero.fTimeCorr; | |
143 | fEvent=tzero.fEvent; | |
144 | fCalib=tzero.fCalib; | |
145 | fT0SigmaT0def[0]=tzero.fT0SigmaT0def[0]; | |
146 | fT0SigmaT0def[1]=tzero.fT0SigmaT0def[1]; | |
147 | fT0SigmaT0def[2]=tzero.fT0SigmaT0def[2]; | |
148 | fT0SigmaT0def[3]=tzero.fT0SigmaT0def[3]; | |
149 | ||
150 | return *this; | |
151 | } | |
536031f2 | 152 | //____________________________________________________________________________ |
153 | AliTOFT0v1::~AliTOFT0v1() | |
154 | { | |
155 | // dtor | |
8f589502 | 156 | fCalib=NULL; |
157 | fEvent=NULL; | |
158 | ||
536031f2 | 159 | } |
8f589502 | 160 | //____________________________________________________________________________ |
536031f2 | 161 | void AliTOFT0v1::SetTimeResolution(Double_t timeresolution){ |
8f589502 | 162 | // Set the TOF time resolution |
536031f2 | 163 | fTimeResolution=timeresolution; |
164 | } | |
165 | //____________________________________________________________________________ | |
166 | //____________________________________________________________________________ | |
167 | Double_t * AliTOFT0v1::DefineT0(Option_t *option) | |
168 | { | |
8f589502 | 169 | // Caluclate the Event Time using the ESD TOF time |
170 | ||
171 | Float_t timeresolutioninns=fTimeResolution*(1.e+9) * TMath::Sqrt(2.); // convert in [ns] | |
536031f2 | 172 | |
173 | const Int_t nmaxtracksinset=10; | |
6a4e212e | 174 | // if(strstr(option,"all")){ |
175 | // cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl; | |
176 | // cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl; | |
177 | // } | |
536031f2 | 178 | |
179 | ||
180 | Int_t nsets=0; | |
8f589502 | 181 | Int_t nUsedTracks=0; |
536031f2 | 182 | Int_t ngoodsetsSel= 0; |
183 | Float_t t0bestSel[300]; | |
8f589502 | 184 | Float_t eT0bestSel[300]; |
185 | Float_t chiSquarebestSel[300]; | |
186 | Float_t confLevelbestSel[300]; | |
536031f2 | 187 | Float_t t0bestallSel=0.; |
8f589502 | 188 | Float_t eT0bestallSel=0.; |
536031f2 | 189 | Float_t sumWt0bestallSel=0.; |
8f589502 | 190 | Float_t eMeanTzeroPi=0.; |
536031f2 | 191 | Float_t meantzeropi=0.; |
192 | Float_t sumAllweightspi=0.; | |
193 | Double_t t0def=-999; | |
194 | Double_t deltat0def=999; | |
195 | Int_t ngoodtrktrulyused=0; | |
196 | Int_t ntracksinsetmyCut = 0; | |
197 | ||
198 | Int_t ntrk=fEvent->GetNumberOfTracks(); | |
199 | ||
200 | AliESDtrack **tracks=new AliESDtrack*[ntrk]; | |
201 | Int_t ngoodtrk=0; | |
202 | Int_t ngoodtrkt0 =0; | |
203 | Float_t mintime =1E6; | |
204 | ||
205 | // First Track loop, Selection of good tracks | |
206 | ||
207 | for (Int_t itrk=0; itrk<ntrk; itrk++) { | |
208 | AliESDtrack *t=fEvent->GetTrack(itrk); | |
209 | Double_t momOld=t->GetP(); | |
210 | Double_t mom=momOld-0.0036*momOld; | |
211 | if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue; | |
212 | Double_t time=t->GetTOFsignal(); | |
213 | ||
214 | time*=1.E-3; // tof given in nanoseconds | |
215 | if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue; | |
14b2cbea | 216 | |
217 | if (!AcceptTrack(t)) continue; | |
536031f2 | 218 | |
219 | if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays | |
220 | if(time <= mintime) mintime=time; | |
221 | tracks[ngoodtrk]=t; | |
222 | ngoodtrk++; | |
223 | } | |
224 | ||
225 | ||
6a4e212e | 226 | // cout << " N. of ESD tracks : " << ntrk << endl; |
227 | // cout << " N. of preselected tracks : " << ngoodtrk << endl; | |
228 | // cout << " Minimum tof time in set (in ns) : " << mintime << endl; | |
536031f2 | 229 | |
230 | AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk]; | |
231 | ||
232 | for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) { | |
233 | AliESDtrack *t=tracks[jtrk]; | |
234 | Double_t time=t->GetTOFsignal(); | |
235 | ||
236 | if((time-mintime*1.E3)<50.E3){ // For pp and per | |
237 | gtracks[ngoodtrkt0]=t; | |
238 | ngoodtrkt0++; | |
239 | } | |
240 | } | |
241 | ||
242 | ||
243 | Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1; | |
244 | Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq; | |
245 | if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++; | |
246 | ||
247 | if(ngoodtrkt0<2){ | |
6a4e212e | 248 | // cout << "less than 2 tracks, skip event " << endl; |
536031f2 | 249 | t0def=-999; |
250 | deltat0def=0.600; | |
251 | fT0SigmaT0def[0]=t0def; | |
252 | fT0SigmaT0def[1]=deltat0def; | |
253 | fT0SigmaT0def[2]=ngoodtrkt0; | |
254 | fT0SigmaT0def[3]=ngoodtrkt0; | |
255 | //goto finish; | |
256 | } | |
257 | if(ngoodtrkt0>=2){ | |
258 | // Decide how many tracks in set | |
259 | Int_t ntracksinset = min(ngoodtrkt0,nmaxtracksinsetCurrent); | |
260 | Int_t nset=1; | |
261 | ||
262 | if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;} | |
6a4e212e | 263 | |
536031f2 | 264 | // Loop over selected sets |
265 | ||
266 | if(nset>=1){ | |
267 | for (Int_t i=0; i< nset; i++) { | |
268 | ||
269 | Float_t t0best=999.; | |
8f589502 | 270 | Float_t eT0best=999.; |
536031f2 | 271 | Float_t chisquarebest=99999.; |
272 | Int_t npionbest=0; | |
273 | ||
274 | Int_t ntracksinsetmy=0; | |
275 | AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset]; | |
276 | for (Int_t itrk=0; itrk<ntracksinset; itrk++) { | |
277 | Int_t index = itrk+i*ntracksinset; | |
278 | if(index < ngoodtrkt0){ | |
279 | AliESDtrack *t=gtracks[index]; | |
280 | tracksT0[itrk]=t; | |
281 | ntracksinsetmy++; | |
282 | } | |
283 | } | |
284 | ||
285 | // Analyse it | |
286 | ||
287 | Int_t assparticle[nmaxtracksinset]; | |
288 | Float_t exptof[nmaxtracksinset][3]; | |
289 | Float_t timeofflight[nmaxtracksinset]; | |
290 | Float_t momentum[nmaxtracksinset]; | |
291 | Float_t timezero[nmaxtracksinset]; | |
292 | Float_t weightedtimezero[nmaxtracksinset]; | |
293 | Float_t beta[nmaxtracksinset]; | |
294 | Float_t texp[nmaxtracksinset]; | |
295 | Float_t dtexp[nmaxtracksinset]; | |
296 | Float_t sqMomError[nmaxtracksinset]; | |
297 | Float_t sqTrackError[nmaxtracksinset]; | |
298 | Float_t massarray[3]={0.13957,0.493677,0.9382723}; | |
299 | Float_t tracktoflen[nmaxtracksinset]; | |
300 | Float_t besttimezero[nmaxtracksinset]; | |
301 | Float_t besttexp[nmaxtracksinset]; | |
302 | Float_t besttimeofflight[nmaxtracksinset]; | |
303 | Float_t bestmomentum[nmaxtracksinset]; | |
304 | Float_t bestchisquare[nmaxtracksinset]; | |
305 | Float_t bestweightedtimezero[nmaxtracksinset]; | |
306 | Float_t bestsqTrackError[nmaxtracksinset]; | |
307 | Int_t imass[nmaxtracksinset]; | |
308 | ||
309 | for (Int_t j=0; j<ntracksinset; j++) { | |
310 | assparticle[j] = 3; | |
311 | timeofflight[j] = 0; | |
312 | momentum[j] = 0; | |
313 | timezero[j] = 0; | |
314 | weightedtimezero[j] = 0; | |
315 | beta[j] = 0; | |
316 | texp[j] = 0; | |
317 | dtexp[j] = 0; | |
318 | sqMomError[j] = 0; | |
319 | sqTrackError[j] = 0; | |
320 | tracktoflen[j] = 0; | |
321 | besttimezero[j] = 0; | |
322 | besttexp[j] = 0; | |
323 | besttimeofflight[j] = 0; | |
324 | bestmomentum[j] = 0; | |
325 | bestchisquare[j] = 0; | |
326 | bestweightedtimezero[j] = 0; | |
327 | bestsqTrackError[j] = 0; | |
328 | imass[j] = 1; | |
329 | } | |
330 | ||
331 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
332 | AliESDtrack *t=tracksT0[j]; | |
333 | Double_t momOld=t->GetP(); | |
334 | Double_t mom=momOld-0.0036*momOld; | |
335 | Double_t time=t->GetTOFsignal(); | |
336 | ||
337 | time*=1.E-3; // tof given in nanoseconds | |
338 | Double_t exptime[10]; t->GetIntegratedTimes(exptime); | |
339 | Double_t toflen=t->GetIntegratedLength(); | |
340 | toflen=toflen/100.; // toflen given in m | |
341 | ||
8f589502 | 342 | timeofflight[j]=time; |
343 | tracktoflen[j]=toflen; | |
536031f2 | 344 | exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns |
345 | exptof[j][1]=exptime[3]*1.E-3+fTimeCorr; | |
346 | exptof[j][2]=exptime[4]*1.E-3+fTimeCorr; | |
347 | momentum[j]=mom; | |
348 | assparticle[j]=3; | |
349 | ||
350 | } //end for (Int_t j=0; j<ntracksinsetmy; j++) { | |
351 | ||
536031f2 | 352 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { |
353 | beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0] | |
354 | +momentum[itz]*momentum[itz]); | |
355 | 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])); | |
356 | sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns | |
357 | timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns | |
358 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
359 | sumAllweightspi+=1./sqTrackError[itz]; | |
360 | meantzeropi+=weightedtimezero[itz]; | |
361 | } // end loop for (Int_t itz=0; itz< ntracksinset;itz++) | |
362 | ||
363 | ||
364 | // Then, Combinatorial Algorithm | |
365 | ||
366 | if(ntracksinsetmy<2 )break; | |
367 | ||
368 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
369 | imass[j] = 3; | |
370 | } | |
371 | ||
372 | Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy)); | |
373 | ||
374 | // Loop on mass hypotheses | |
375 | for (Int_t k=0; k < ncombinatorial;k++) { | |
376 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
377 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
378 | texp[j]=exptof[j][imass[j]]; | |
379 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
380 | } | |
381 | Float_t sumAllweights=0.; | |
382 | Float_t meantzero=0.; | |
8f589502 | 383 | Float_t eMeanTzero=0.; |
536031f2 | 384 | |
385 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
386 | sqTrackError[itz]= | |
387 | (timeresolutioninns* | |
388 | timeresolutioninns | |
389 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
390 | ||
391 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
392 | ||
393 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
394 | sumAllweights+=1./sqTrackError[itz]; | |
395 | meantzero+=weightedtimezero[itz]; | |
396 | ||
397 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
398 | ||
399 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
8f589502 | 400 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] |
536031f2 | 401 | |
402 | // calculate chisquare | |
403 | ||
404 | Float_t chisquare=0.; | |
405 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
406 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
407 | ||
408 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
409 | ||
410 | if(chisquare<=chisquarebest){ | |
411 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
412 | ||
413 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
414 | besttimezero[iqsq]=timezero[iqsq]; | |
415 | bestmomentum[iqsq]=momentum[iqsq]; | |
416 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
417 | besttexp[iqsq]=texp[iqsq]; | |
418 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
419 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
420 | } | |
421 | ||
422 | Int_t npion=0; | |
423 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
424 | assparticle[j]=imass[j]; | |
425 | if(imass[j] == 0) npion++; | |
426 | } | |
427 | npionbest=npion; | |
428 | chisquarebest=chisquare; | |
429 | t0best=meantzero; | |
8f589502 | 430 | eT0best=eMeanTzero; |
536031f2 | 431 | } // close if(dummychisquare<=chisquare) |
432 | ||
433 | } | |
434 | ||
435 | Double_t chi2cut[nmaxtracksinset]; | |
436 | chi2cut[0] = 0; | |
437 | chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01 | |
438 | for (Int_t j=2; j<ntracksinset; j++) { | |
439 | chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.); | |
440 | } | |
441 | ||
442 | Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy; | |
443 | ||
6a4e212e | 444 | // printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]); |
536031f2 | 445 | |
446 | Bool_t kRedoT0 = kFALSE; | |
447 | ntracksinsetmyCut = ntracksinsetmy; | |
448 | Bool_t usetrack[nmaxtracksinset]; | |
449 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
450 | usetrack[icsq] = kTRUE; | |
451 | if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){ | |
452 | kRedoT0 = kTRUE; | |
453 | ntracksinsetmyCut--; | |
454 | usetrack[icsq] = kFALSE; | |
455 | } | |
456 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
457 | ||
6a4e212e | 458 | // printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut); |
536031f2 | 459 | |
460 | // Loop on mass hypotheses Redo | |
461 | if(kRedoT0 && ntracksinsetmyCut > 1){ | |
6a4e212e | 462 | // printf("Redo T0\n"); |
536031f2 | 463 | for (Int_t k=0; k < ncombinatorial;k++) { |
464 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
465 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
466 | texp[j]=exptof[j][imass[j]]; | |
467 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
468 | } | |
469 | ||
470 | Float_t sumAllweights=0.; | |
471 | Float_t meantzero=0.; | |
8f589502 | 472 | Float_t eMeanTzero=0.; |
536031f2 | 473 | |
474 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
475 | if(! usetrack[itz]) continue; | |
476 | sqTrackError[itz]= | |
477 | (timeresolutioninns* | |
478 | timeresolutioninns | |
479 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
480 | ||
481 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
482 | ||
483 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
484 | sumAllweights+=1./sqTrackError[itz]; | |
485 | meantzero+=weightedtimezero[itz]; | |
486 | ||
487 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
488 | ||
489 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
8f589502 | 490 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] |
536031f2 | 491 | |
492 | // calculate chisquare | |
493 | ||
494 | Float_t chisquare=0.; | |
495 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
496 | if(! usetrack[icsq]) continue; | |
497 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
498 | ||
499 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
500 | ||
501 | Int_t npion=0; | |
502 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
503 | assparticle[j]=imass[j]; | |
504 | if(imass[j] == 0) npion++; | |
505 | } | |
506 | ||
507 | if(chisquare<=chisquarebest){ | |
508 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
509 | if(! usetrack[iqsq]) continue; | |
510 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
511 | besttimezero[iqsq]=timezero[iqsq]; | |
512 | bestmomentum[iqsq]=momentum[iqsq]; | |
513 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
514 | besttexp[iqsq]=texp[iqsq]; | |
515 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
516 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
517 | } | |
518 | ||
519 | npionbest=npion; | |
520 | chisquarebest=chisquare; | |
521 | t0best=meantzero; | |
8f589502 | 522 | eT0best=eMeanTzero; |
536031f2 | 523 | } // close if(dummychisquare<=chisquare) |
524 | ||
525 | } | |
526 | } | |
6a4e212e | 527 | |
536031f2 | 528 | // filling histos |
529 | Float_t confLevel=999; | |
530 | ||
531 | // Sets with decent chisquares | |
532 | ||
533 | if(chisquarebest<999.){ | |
534 | Double_t dblechisquare=(Double_t)chisquarebest; | |
535 | confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1); | |
6a4e212e | 536 | // cout << " Set Number " << nsets << endl; |
537 | // cout << "Best Assignment, selection " << assparticle[0] << | |
538 | // assparticle[1] << assparticle[2] << | |
539 | // assparticle[3] << assparticle[4] << | |
540 | // assparticle[5] << endl; | |
541 | // cout << " Chisquare of the set "<< chisquarebest <<endl; | |
542 | // cout << " C.L. of the set "<< confLevel <<endl; | |
543 | // cout << " T0 for this set (in ns) " << t0best << endl; | |
536031f2 | 544 | |
545 | for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){ | |
546 | ||
547 | if(! usetrack[icsq]) continue; | |
548 | ||
6a4e212e | 549 | // cout << "Track # " << icsq << " T0 offsets = " |
550 | // << besttimezero[icsq]-t0best << | |
551 | // " track error = " << bestsqTrackError[icsq] | |
552 | // << " Chisquare = " << bestchisquare[icsq] | |
553 | // << " Momentum = " << bestmomentum[icsq] | |
554 | // << " TOF = " << besttimeofflight[icsq] | |
555 | // << " TOF tracking = " << besttexp[icsq] | |
556 | // << " is used = " << usetrack[icsq] << endl; | |
536031f2 | 557 | } |
558 | ||
559 | // Pick up only those with C.L. >1% | |
560 | // if(confLevel>0.01 && ngoodsetsSel<200){ | |
561 | if(confLevel>0.01 && ngoodsetsSel<200){ | |
8f589502 | 562 | chiSquarebestSel[ngoodsetsSel]=chisquarebest; |
563 | confLevelbestSel[ngoodsetsSel]=confLevel; | |
564 | t0bestSel[ngoodsetsSel]=t0best/eT0best/eT0best; | |
565 | eT0bestSel[ngoodsetsSel]=1./eT0best/eT0best; | |
566 | t0bestallSel += t0best/eT0best/eT0best; | |
567 | sumWt0bestallSel += 1./eT0best/eT0best; | |
536031f2 | 568 | ngoodsetsSel++; |
569 | ngoodtrktrulyused+=ntracksinsetmyCut; | |
570 | } | |
571 | else{ | |
6a4e212e | 572 | // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy); |
536031f2 | 573 | } |
574 | } | |
575 | delete[] tracksT0; | |
576 | nsets++; | |
577 | ||
578 | } // end for the current set | |
579 | ||
8f589502 | 580 | nUsedTracks = ngoodtrkt0; |
536031f2 | 581 | if(strstr(option,"all")){ |
582 | if(sumAllweightspi>0.){ | |
583 | meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns] | |
8f589502 | 584 | eMeanTzeroPi=sqrt(1./sumAllweightspi); // it is given in [ns] |
536031f2 | 585 | } |
586 | ||
587 | if(sumWt0bestallSel>0){ | |
588 | t0bestallSel = t0bestallSel/sumWt0bestallSel; | |
8f589502 | 589 | eT0bestallSel = sqrt(1./sumWt0bestallSel); |
536031f2 | 590 | |
591 | }// end of if(sumWt0bestallSel>0){ | |
592 | ||
6a4e212e | 593 | // cout << "T0 all " << t0bestallSel << " +/- " << eT0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl; |
536031f2 | 594 | } |
595 | ||
596 | t0def=t0bestallSel; | |
8f589502 | 597 | deltat0def=eT0bestallSel; |
598 | if ((TMath::Abs(t0bestallSel) < 0.001)&&(TMath::Abs(eT0bestallSel)<0.001)){ | |
536031f2 | 599 | t0def=-999; deltat0def=0.600; |
600 | } | |
601 | ||
602 | fT0SigmaT0def[0]=t0def; | |
603 | fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*(ngoodtrktrulyused/(ngoodtrktrulyused-1))); | |
6a4e212e | 604 | fT0SigmaT0def[2]=ngoodtrkt0; |
536031f2 | 605 | fT0SigmaT0def[3]=ngoodtrktrulyused; |
606 | } | |
607 | } | |
608 | ||
6a4e212e | 609 | // if(strstr(option,"tim") || strstr(option,"all")){ |
610 | // cout << "AliTOFT0v1:" << endl ; | |
611 | //} | |
536031f2 | 612 | |
613 | return fT0SigmaT0def; | |
614 | } | |
615 | //__________________________________________________________________ | |
616 | Double_t * AliTOFT0v1::DefineT0RawCorrection(Option_t *option) | |
617 | { | |
8f589502 | 618 | // Caluclate the Event Time using the RAW+correction TOF time |
619 | ||
536031f2 | 620 | Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns] |
621 | ||
622 | const Int_t nmaxtracksinset=10; | |
6a4e212e | 623 | // if(strstr(option,"all")){ |
624 | // cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl; | |
625 | // cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl; | |
626 | // } | |
536031f2 | 627 | |
628 | Float_t stripmean = 0; | |
629 | ||
630 | Int_t nsets=0; | |
8f589502 | 631 | Int_t nUsedTracks=0; |
536031f2 | 632 | Int_t ngoodsetsSel= 0; |
633 | Float_t t0bestSel[300]; | |
8f589502 | 634 | Float_t eT0bestSel[300]; |
635 | Float_t chiSquarebestSel[300]; | |
636 | Float_t confLevelbestSel[300]; | |
536031f2 | 637 | Float_t t0bestallSel=0.; |
8f589502 | 638 | Float_t eT0bestallSel=0.; |
536031f2 | 639 | Float_t sumWt0bestallSel=0.; |
8f589502 | 640 | Float_t eMeanTzeroPi=0.; |
536031f2 | 641 | Float_t meantzeropi=0.; |
642 | Float_t sumAllweightspi=0.; | |
643 | Double_t t0def=-999; | |
644 | Double_t deltat0def=999; | |
645 | Int_t ngoodtrktrulyused=0; | |
646 | Int_t ntracksinsetmyCut = 0; | |
647 | ||
648 | Int_t ntrk=fEvent->GetNumberOfTracks(); | |
649 | ||
650 | AliESDtrack **tracks=new AliESDtrack*[ntrk]; | |
651 | Int_t ngoodtrk=0; | |
652 | Int_t ngoodtrkt0 =0; | |
653 | Float_t mintime =1E6; | |
654 | ||
655 | // First Track loop, Selection of good tracks | |
656 | ||
657 | for (Int_t itrk=0; itrk<ntrk; itrk++) { | |
658 | AliESDtrack *t=fEvent->GetTrack(itrk); | |
659 | Double_t momOld=t->GetP(); | |
660 | Double_t mom=momOld-0.0036*momOld; | |
661 | if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue; | |
662 | Double_t tot = t->GetTOFsignalToT(); | |
663 | Double_t time=t->GetTOFsignalRaw(); | |
664 | Int_t chan = t->GetTOFCalChannel(); | |
665 | Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0); | |
666 | time -= corr*1000.; | |
667 | ||
8f589502 | 668 | Int_t crate = (Int_t) fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan); |
536031f2 | 669 | if(crate == 63 || crate == 62){ |
670 | time += 9200; | |
671 | } | |
672 | ||
8f589502 | 673 | Int_t strip = (Int_t) fCalib->GetCalibMap(AliTOFcalibHisto::kSectorStrip,chan); |
536031f2 | 674 | |
675 | time*=1.E-3; // tof given in nanoseconds | |
676 | if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue; | |
14b2cbea | 677 | |
678 | if (!AcceptTrack(t)) continue; | |
536031f2 | 679 | |
680 | if(t->GetP() < fLowerMomBound || t->GetIntegratedLength() < 350 || t->GetTOFsignalToT() < 0.000000001)continue; //skip decays | |
681 | if(time <= mintime) mintime=time; | |
682 | tracks[ngoodtrk]=t; | |
683 | ngoodtrk++; | |
684 | stripmean += strip; | |
685 | } | |
686 | if(ngoodtrk) stripmean /= ngoodtrk; | |
687 | ||
6a4e212e | 688 | // cout << " N. of ESD tracks : " << ntrk << endl; |
689 | // cout << " N. of preselected tracks : " << ngoodtrk << endl; | |
690 | // cout << " Minimum tof time in set (in ns) : " << mintime << endl; | |
536031f2 | 691 | |
692 | AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk]; | |
693 | ||
694 | for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) { | |
695 | AliESDtrack *t=tracks[jtrk]; | |
696 | Double_t tot = t->GetTOFsignalToT(); | |
697 | Double_t time=t->GetTOFsignalRaw(); | |
698 | Int_t chan = t->GetTOFCalChannel(); | |
699 | Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0); | |
700 | time -= corr*1000.; | |
701 | ||
8f589502 | 702 | Int_t crate = (Int_t) fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan); |
703 | if(crate == 63 || crate == 62){ | |
536031f2 | 704 | time += 9200; |
705 | } | |
706 | ||
707 | if((time-mintime*1.E3)<50.E3){ // For pp and per | |
708 | gtracks[ngoodtrkt0]=t; | |
709 | ngoodtrkt0++; | |
710 | } | |
711 | } | |
712 | ||
713 | Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1; | |
714 | Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq; | |
715 | if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++; | |
716 | ||
717 | if(ngoodtrkt0 > 1){ | |
718 | Int_t nlastset = (ngoodtrkt0 % nmaxtracksinsetCurrent); | |
719 | ||
720 | while(nlastset-nseteq+1 > 2 ){ | |
721 | nmaxtracksinsetCurrent++; | |
722 | nlastset -= nseteq-1; | |
723 | } | |
724 | if(nmaxtracksinsetCurrent > nmaxtracksinset) nmaxtracksinsetCurrent = nmaxtracksinset; | |
725 | } | |
726 | ||
727 | if(ngoodtrkt0<2){ | |
6a4e212e | 728 | // cout << "less than 2 tracks, skip event " << endl; |
536031f2 | 729 | t0def=-999; |
730 | deltat0def=0.600; | |
731 | fT0SigmaT0def[0]=t0def; | |
732 | fT0SigmaT0def[1]=deltat0def; | |
733 | fT0SigmaT0def[2]=ngoodtrkt0; | |
734 | fT0SigmaT0def[3]=ngoodtrkt0; | |
735 | //goto finish; | |
736 | } | |
737 | if(ngoodtrkt0>=2){ | |
738 | // Decide how many tracks in set | |
739 | Int_t ntracksinset = min(ngoodtrkt0,nmaxtracksinsetCurrent); | |
740 | Int_t nset=1; | |
741 | if(ngoodtrkt0>nmaxtracksinset) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;} | |
742 | ||
536031f2 | 743 | // Loop over selected sets |
744 | ||
745 | if(nset>=1){ | |
746 | for (Int_t i=0; i< nset; i++) { | |
747 | ||
748 | Float_t t0best=999.; | |
8f589502 | 749 | Float_t eT0best=999.; |
536031f2 | 750 | Float_t chisquarebest=99999.; |
751 | Int_t npionbest=0; | |
752 | ||
753 | Int_t ntracksinsetmy=0; | |
754 | AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset]; | |
755 | for (Int_t itrk=0; itrk<ntracksinset; itrk++) { | |
756 | Int_t index = itrk+i*ntracksinset; | |
757 | if(index < ngoodtrkt0){ | |
758 | AliESDtrack *t=gtracks[index]; | |
759 | tracksT0[itrk]=t; | |
760 | ntracksinsetmy++; | |
761 | } | |
762 | } | |
763 | ||
764 | // Analyse it | |
765 | ||
766 | Int_t assparticle[nmaxtracksinset]; | |
767 | Float_t exptof[nmaxtracksinset][3]; | |
768 | Float_t timeofflight[nmaxtracksinset]; | |
769 | Float_t momentum[nmaxtracksinset]; | |
770 | Float_t timezero[nmaxtracksinset]; | |
771 | Float_t weightedtimezero[nmaxtracksinset]; | |
772 | Float_t beta[nmaxtracksinset]; | |
773 | Float_t texp[nmaxtracksinset]; | |
774 | Float_t dtexp[nmaxtracksinset]; | |
775 | Float_t sqMomError[nmaxtracksinset]; | |
776 | Float_t sqTrackError[nmaxtracksinset]; | |
777 | Float_t massarray[3]={0.13957,0.493677,0.9382723}; | |
778 | Float_t tracktoflen[nmaxtracksinset]; | |
779 | Float_t besttimezero[nmaxtracksinset]; | |
780 | Float_t besttexp[nmaxtracksinset]; | |
781 | Float_t besttimeofflight[nmaxtracksinset]; | |
782 | Float_t bestmomentum[nmaxtracksinset]; | |
783 | Float_t bestchisquare[nmaxtracksinset]; | |
784 | Float_t bestweightedtimezero[nmaxtracksinset]; | |
785 | Float_t bestsqTrackError[nmaxtracksinset]; | |
786 | Int_t imass[nmaxtracksinset]; | |
787 | ||
788 | for (Int_t j=0; j<ntracksinset; j++) { | |
789 | assparticle[j] = 3; | |
790 | timeofflight[j] = 0; | |
791 | momentum[j] = 0; | |
792 | timezero[j] = 0; | |
793 | weightedtimezero[j] = 0; | |
794 | beta[j] = 0; | |
795 | texp[j] = 0; | |
796 | dtexp[j] = 0; | |
797 | sqMomError[j] = 0; | |
798 | sqTrackError[j] = 0; | |
799 | tracktoflen[j] = 0; | |
800 | besttimezero[j] = 0; | |
801 | besttexp[j] = 0; | |
802 | besttimeofflight[j] = 0; | |
803 | bestmomentum[j] = 0; | |
804 | bestchisquare[j] = 0; | |
805 | bestweightedtimezero[j] = 0; | |
806 | bestsqTrackError[j] = 0; | |
807 | imass[j] = 1; | |
808 | } | |
809 | ||
810 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
811 | AliESDtrack *t=tracksT0[j]; | |
812 | Double_t momOld=t->GetP(); | |
813 | Double_t mom=momOld-0.0036*momOld; | |
814 | Double_t tot = t->GetTOFsignalToT(); | |
815 | Double_t time=t->GetTOFsignalRaw(); | |
816 | Int_t chan = t->GetTOFCalChannel(); | |
817 | Double_t corr = fCalib->GetFullCorrection(chan,tot) - fCalib->GetCorrection(AliTOFcalibHisto::kTimeSlewingCorr,chan,0); | |
818 | time -= corr*1000.; | |
819 | ||
8f589502 | 820 | Int_t crate = (Int_t) fCalib->GetCalibMap(AliTOFcalibHisto::kDDL,chan); |
821 | if(crate == 63 || crate == 62){ | |
536031f2 | 822 | time += 9200; |
823 | } | |
824 | ||
825 | time*=1.E-3; // tof given in nanoseconds | |
826 | Double_t exptime[10]; t->GetIntegratedTimes(exptime); | |
827 | Double_t toflen=t->GetIntegratedLength(); | |
828 | toflen=toflen/100.; // toflen given in m | |
829 | ||
8f589502 | 830 | timeofflight[j]=time; |
831 | tracktoflen[j]=toflen; | |
536031f2 | 832 | exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns |
833 | exptof[j][1]=exptime[3]*1.E-3+fTimeCorr; | |
834 | exptof[j][2]=exptime[4]*1.E-3+fTimeCorr; | |
835 | momentum[j]=mom; | |
836 | assparticle[j]=3; | |
837 | ||
838 | } //end for (Int_t j=0; j<ntracksinsetmy; j++) { | |
839 | ||
536031f2 | 840 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { |
841 | beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0] | |
842 | +momentum[itz]*momentum[itz]); | |
843 | 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])); | |
844 | sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns | |
845 | timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns | |
846 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
847 | sumAllweightspi+=1./sqTrackError[itz]; | |
848 | meantzeropi+=weightedtimezero[itz]; | |
849 | } // end loop for (Int_t itz=0; itz< ntracksinset;itz++) | |
850 | ||
851 | ||
852 | // Then, Combinatorial Algorithm | |
853 | ||
854 | if(ntracksinsetmy<2 )break; | |
855 | ||
856 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
857 | imass[j] = 3; | |
858 | } | |
859 | ||
860 | Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy)); | |
861 | ||
862 | // Loop on mass hypotheses | |
863 | for (Int_t k=0; k < ncombinatorial;k++) { | |
864 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
865 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
866 | texp[j]=exptof[j][imass[j]]; | |
867 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
868 | } | |
869 | Float_t sumAllweights=0.; | |
870 | Float_t meantzero=0.; | |
8f589502 | 871 | Float_t eMeanTzero=0.; |
536031f2 | 872 | Double_t sumAllSquare=0.; |
873 | ||
874 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
875 | sqTrackError[itz]= | |
876 | (timeresolutioninns* | |
877 | timeresolutioninns | |
878 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
879 | ||
880 | // printf("pt=%f -- TOF res=%f -- track res=%f -- all res=%f\n",momentum[itz],timeresolutioninns,dtexp[itz],TMath::Sqrt(sqTrackError[itz])); | |
881 | // getchar(); | |
882 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
883 | ||
884 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
885 | sumAllSquare += timezero[itz]*timezero[itz]; | |
886 | sumAllweights+=1./sqTrackError[itz]; | |
887 | meantzero+=weightedtimezero[itz]; | |
888 | ||
889 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
890 | ||
891 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
8f589502 | 892 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] |
536031f2 | 893 | |
894 | //changed | |
895 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
896 | sumAllSquare+= (timezero[itz] - meantzero)*(timezero[itz] - meantzero); | |
897 | } | |
8f589502 | 898 | // eMeanTzero = TMath::Sqrt(sumAllSquare/ntracksinsetmy); |
536031f2 | 899 | |
900 | // calculate chisquare | |
901 | ||
902 | Float_t chisquare=0.; | |
903 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
904 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
905 | ||
906 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
907 | ||
908 | if(chisquare<=chisquarebest){ | |
909 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
910 | ||
911 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
912 | besttimezero[iqsq]=timezero[iqsq]; | |
913 | bestmomentum[iqsq]=momentum[iqsq]; | |
914 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
915 | besttexp[iqsq]=texp[iqsq]; | |
916 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
917 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
918 | } | |
919 | ||
920 | Int_t npion=0; | |
921 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
922 | assparticle[j]=imass[j]; | |
923 | if(imass[j] == 0) npion++; | |
924 | } | |
925 | npionbest=npion; | |
926 | chisquarebest=chisquare; | |
927 | t0best=meantzero; | |
8f589502 | 928 | eT0best=eMeanTzero; |
536031f2 | 929 | } // close if(dummychisquare<=chisquare) |
930 | ||
931 | } | |
932 | ||
933 | Double_t chi2cut[nmaxtracksinset]; | |
934 | chi2cut[0] = 0; | |
935 | chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01 | |
936 | for (Int_t j=2; j<ntracksinset; j++) { | |
937 | chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.); | |
938 | } | |
939 | ||
940 | Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy; | |
941 | ||
6a4e212e | 942 | // printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]); |
536031f2 | 943 | |
944 | Bool_t kRedoT0 = kFALSE; | |
945 | ntracksinsetmyCut = ntracksinsetmy; | |
946 | Bool_t usetrack[nmaxtracksinset]; | |
947 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
948 | usetrack[icsq] = kTRUE; | |
949 | if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){ | |
950 | kRedoT0 = kTRUE; | |
951 | ntracksinsetmyCut--; | |
952 | usetrack[icsq] = kFALSE; | |
953 | } | |
954 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
955 | ||
6a4e212e | 956 | // printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut); |
536031f2 | 957 | |
958 | // Loop on mass hypotheses Redo | |
959 | if(kRedoT0 && ntracksinsetmyCut > 1){ | |
6a4e212e | 960 | // printf("Redo T0\n"); |
536031f2 | 961 | for (Int_t k=0; k < ncombinatorial;k++) { |
962 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
963 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
964 | texp[j]=exptof[j][imass[j]]; | |
965 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
966 | } | |
967 | ||
968 | Float_t sumAllweights=0.; | |
969 | Float_t meantzero=0.; | |
8f589502 | 970 | Float_t eMeanTzero=0.; |
536031f2 | 971 | Double_t sumAllSquare=0; |
972 | ||
973 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
974 | if(! usetrack[itz]) continue; | |
975 | sqTrackError[itz]= | |
976 | (timeresolutioninns* | |
977 | timeresolutioninns | |
978 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
979 | ||
980 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
981 | ||
982 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
983 | sumAllweights+=1./sqTrackError[itz]; | |
984 | meantzero+=weightedtimezero[itz]; | |
985 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
986 | ||
987 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
8f589502 | 988 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] |
536031f2 | 989 | |
990 | //changed | |
991 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
992 | if(! usetrack[itz]) continue; | |
993 | sumAllSquare+= (timezero[itz] - meantzero)*(timezero[itz] - meantzero); | |
994 | } | |
8f589502 | 995 | // eMeanTzero = TMath::Sqrt(sumAllSquare/ntracksinsetmyCut); |
536031f2 | 996 | |
997 | // calculate chisquare | |
998 | ||
999 | Float_t chisquare=0.; | |
1000 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
1001 | if(! usetrack[icsq]) continue; | |
1002 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
1003 | ||
1004 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
1005 | ||
1006 | Int_t npion=0; | |
1007 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
1008 | assparticle[j]=imass[j]; | |
1009 | if(imass[j] == 0) npion++; | |
1010 | } | |
1011 | ||
1012 | if(chisquare<=chisquarebest){ | |
1013 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
1014 | if(! usetrack[iqsq]) continue; | |
1015 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
1016 | besttimezero[iqsq]=timezero[iqsq]; | |
1017 | bestmomentum[iqsq]=momentum[iqsq]; | |
1018 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
1019 | besttexp[iqsq]=texp[iqsq]; | |
1020 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
1021 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
1022 | } | |
1023 | ||
1024 | npionbest=npion; | |
1025 | chisquarebest=chisquare; | |
1026 | t0best=meantzero; | |
8f589502 | 1027 | eT0best=eMeanTzero; |
536031f2 | 1028 | } // close if(dummychisquare<=chisquare) |
1029 | ||
1030 | } | |
1031 | } | |
1032 | ||
1033 | if(chisquarebest >= 999){ | |
1034 | printf("How is it possible (chi2 = %f)? T0best = %f\n",chisquarebest,t0best); | |
1035 | ||
6a4e212e | 1036 | // for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){ |
1037 | // cout << "Track # " << icsq << " T0 offsets = " | |
1038 | // << besttimezero[icsq]-t0best << | |
1039 | // " track error = " << bestsqTrackError[icsq] | |
1040 | // << " Chisquare = " << bestchisquare[icsq] | |
1041 | // << " Momentum = " << bestmomentum[icsq] | |
1042 | // << " TOF = " << besttimeofflight[icsq] | |
1043 | // << " TOF tracking = " << besttexp[icsq] | |
1044 | // << " is used = " << usetrack[icsq] << endl; | |
1045 | // } | |
536031f2 | 1046 | } |
1047 | ||
1048 | // filling histos | |
1049 | Float_t confLevel=999; | |
1050 | ||
1051 | // Sets with decent chisquares | |
1052 | ||
1053 | if(chisquarebest<999.){ | |
1054 | Double_t dblechisquare=(Double_t)chisquarebest; | |
1055 | confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1); | |
6a4e212e | 1056 | // cout << " Set Number " << nsets << endl; |
1057 | // cout << "Best Assignment, selection " << assparticle[0] << | |
1058 | // assparticle[1] << assparticle[2] << | |
1059 | // assparticle[3] << assparticle[4] << | |
1060 | // assparticle[5] << endl; | |
1061 | // cout << " Chisquare of the set "<< chisquarebest <<endl; | |
1062 | // cout << " C.L. of the set "<< confLevel <<endl; | |
1063 | // cout << " T0 for this set (in ns) " << t0best << endl; | |
1064 | ||
536031f2 | 1065 | for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){ |
1066 | ||
1067 | if(! usetrack[icsq]) continue; | |
1068 | ||
6a4e212e | 1069 | // cout << "Track # " << icsq << " T0 offsets = " |
1070 | // << besttimezero[icsq]-t0best << | |
1071 | // " track error = " << bestsqTrackError[icsq] | |
1072 | // << " Chisquare = " << bestchisquare[icsq] | |
1073 | // << " Momentum = " << bestmomentum[icsq] | |
1074 | // << " TOF = " << besttimeofflight[icsq] | |
1075 | // << " TOF tracking = " << besttexp[icsq] | |
1076 | // << " is used = " << usetrack[icsq] << endl; | |
536031f2 | 1077 | } |
1078 | ||
1079 | // Pick up only those with C.L. >1% | |
1080 | // if(confLevel>0.01 && ngoodsetsSel<200){ | |
1081 | if(confLevel>0.01 && ngoodsetsSel<200){ | |
8f589502 | 1082 | chiSquarebestSel[ngoodsetsSel]=chisquarebest; |
1083 | confLevelbestSel[ngoodsetsSel]=confLevel; | |
1084 | t0bestSel[ngoodsetsSel]=t0best/eT0best/eT0best; | |
1085 | eT0bestSel[ngoodsetsSel]=1./eT0best/eT0best; | |
1086 | t0bestallSel += t0best/eT0best/eT0best; | |
1087 | sumWt0bestallSel += 1./eT0best/eT0best; | |
536031f2 | 1088 | |
1089 | ngoodsetsSel++; | |
1090 | ngoodtrktrulyused+=ntracksinsetmyCut; | |
1091 | } | |
1092 | else{ | |
6a4e212e | 1093 | // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy); |
536031f2 | 1094 | } |
1095 | } | |
1096 | delete[] tracksT0; | |
1097 | nsets++; | |
1098 | ||
1099 | } // end for the current set | |
1100 | ||
8f589502 | 1101 | nUsedTracks = ngoodtrkt0; |
536031f2 | 1102 | if(strstr(option,"all")){ |
1103 | if(sumAllweightspi>0.){ | |
1104 | meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns] | |
8f589502 | 1105 | eMeanTzeroPi=sqrt(1./sumAllweightspi); // it is given in [ns] |
536031f2 | 1106 | } |
1107 | ||
1108 | if(sumWt0bestallSel>0){ | |
1109 | t0bestallSel = t0bestallSel/sumWt0bestallSel; | |
8f589502 | 1110 | eT0bestallSel = sqrt(1./sumWt0bestallSel); |
536031f2 | 1111 | }// end of if(sumWt0bestallSel>0){ |
1112 | ||
536031f2 | 1113 | } |
1114 | ||
1115 | t0def=t0bestallSel; | |
8f589502 | 1116 | deltat0def=eT0bestallSel; |
1117 | if ((TMath::Abs(t0bestallSel)<0.001)&&(TMath::Abs(eT0bestallSel)<0.001)){ | |
536031f2 | 1118 | t0def=-999; deltat0def=0.600; |
1119 | } | |
1120 | ||
1121 | fT0SigmaT0def[0]=t0def; | |
1122 | fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*(ngoodtrktrulyused/(ngoodtrktrulyused-1))); | |
6a4e212e | 1123 | fT0SigmaT0def[2]=ngoodtrkt0; |
536031f2 | 1124 | fT0SigmaT0def[3]=ngoodtrktrulyused; |
1125 | } | |
1126 | } | |
1127 | ||
536031f2 | 1128 | return fT0SigmaT0def; |
1129 | } | |
536031f2 | 1130 | |
1131 | //__________________________________________________________________ | |
8f589502 | 1132 | Float_t AliTOFT0v1::GetMomError(Int_t index, Float_t mom, Float_t texp) const |
536031f2 | 1133 | { |
8f589502 | 1134 | // Take the error extimate for the TOF time in the track reconstruction |
536031f2 | 1135 | |
536031f2 | 1136 | static const Double_t kMasses[]={ |
1137 | 0.000511, 0.105658, 0.139570, 0.493677, 0.938272, 1.875613 | |
1138 | }; | |
1139 | ||
1140 | Double_t mass=kMasses[index+2]; | |
1141 | Double_t dpp=0.01; //mean relative pt resolution; | |
1142 | Double_t sigma=dpp*texp*1E3/(1.+ mom*mom/(mass*mass)); | |
1143 | ||
1144 | sigma =TMath::Sqrt(sigma*sigma); | |
1145 | ||
1146 | return sigma; | |
1147 | } | |
14b2cbea | 1148 | |
1149 | //__________________________________________________________________ | |
1150 | Bool_t AliTOFT0v1::AcceptTrack(AliESDtrack *track) | |
1151 | { | |
1152 | ||
1153 | /* TPC refit */ | |
1154 | if (!(track->GetStatus() & AliESDtrack::kTPCrefit)) return kFALSE; | |
1155 | /* do not accept kink daughters */ | |
1156 | if (track->GetKinkIndex(0)>0) return kFALSE; | |
1157 | /* N clusters TPC */ | |
1158 | if (track->GetTPCclusters(0) < 50) return kFALSE; | |
1159 | /* chi2 TPC */ | |
1160 | if (track->GetTPCchi2()/Float_t(track->GetTPCclusters(0)) > 3.5) return kFALSE; | |
1161 | /* sigma to vertex */ | |
1162 | if (GetSigmaToVertex(track) > 4.) return kFALSE; | |
1163 | ||
1164 | /* accept track */ | |
1165 | return kTRUE; | |
1166 | ||
1167 | } | |
1168 | ||
1169 | //____________________________________________________________________ | |
8f589502 | 1170 | Float_t AliTOFT0v1::GetSigmaToVertex(AliESDtrack* esdTrack) const |
14b2cbea | 1171 | { |
1172 | // Calculates the number of sigma to the vertex. | |
1173 | ||
1174 | Float_t b[2]; | |
1175 | Float_t bRes[2]; | |
1176 | Float_t bCov[3]; | |
1177 | esdTrack->GetImpactParameters(b,bCov); | |
1178 | ||
1179 | if (bCov[0]<=0 || bCov[2]<=0) { | |
1180 | bCov[0]=0; bCov[2]=0; | |
1181 | } | |
1182 | bRes[0] = TMath::Sqrt(bCov[0]); | |
1183 | bRes[1] = TMath::Sqrt(bCov[2]); | |
1184 | ||
1185 | // ----------------------------------- | |
1186 | // How to get to a n-sigma cut? | |
1187 | // | |
1188 | // The accumulated statistics from 0 to d is | |
1189 | // | |
1190 | // -> Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma) | |
1191 | // -> 1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma) | |
1192 | // | |
1193 | // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-d**2)/2) | |
1194 | // Can this be expressed in a different way? | |
1195 | ||
1196 | if (bRes[0] == 0 || bRes[1] ==0) | |
1197 | return -1; | |
1198 | ||
1199 | Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2)); | |
1200 | ||
1201 | // work around precision problem | |
1202 | // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :( | |
1203 | // 1e-15 corresponds to nsigma ~ 7.7 | |
1204 | if (TMath::Exp(-d * d / 2) < 1e-15) | |
1205 | return 1000; | |
1206 | ||
1207 | Float_t nSigma = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2); | |
1208 | return nSigma; | |
1209 | } |