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536031f2 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
6a4e212e | 16 | /* $Id: AliTOFT0v1.cxx,v 1.8 2010/01/19 16:32:20 noferini Exp $ */ |
536031f2 | 17 | |
18 | //_________________________________________________________________________ | |
19 | // This is a TTask that made the calculation of the Time zero using TOF. | |
20 | // Description: The algorithm used to calculate the time zero of interaction | |
21 | // using TOF detector is the following. | |
6a4e212e | 22 | // We select in the ESD some "primary" particles - or tracks in the following - |
536031f2 | 23 | // that strike the TOF detector (the larger part are pions, kaons or protons). |
24 | // We choose a set of 10 selected tracks, for each track You have the length | |
6a4e212e | 25 | // of the track when the TOF is reached, |
26 | // the momentum and the time of flight | |
536031f2 | 27 | // given by the TOF detector. |
536031f2 | 28 | // Let consider now only one set of 10 tracks (the algorithm is the same for all sets). |
29 | // Assuming the (mass) hypothesis that each track can be AUT a pion, AUT a kaon, AUT a proton, | |
30 | // we consider all the 3 at 10 possible cases. | |
31 | // For each track in each (mass) configuration | |
32 | // (a configuration can be e.g. pion/pion/kaon/proton/pion/proton/kaon/kaon/pion/pion) | |
33 | // we calculate the time zero (we know in fact the velocity of the track after | |
34 | // the assumption about its mass, the time of flight given by the TOF, and the | |
35 | // corresponding path travelled till the TOF detector). Then for each mass configuration we have | |
36 | // 10 time zero and we can calculate the ChiSquare for the current configuration using the | |
37 | // weighted mean over all 10 time zero. | |
38 | // We call the best assignment the mass configuration that gives the minimum value of the ChiSquare. | |
39 | // We plot the weighted mean over all 10 time zero for the best assignment, | |
40 | // the ChiSquare for the best assignment and the corresponding confidence level. | |
41 | // The strong assumption is the MC selection of primary particles. It will be introduced | |
42 | // in the future also some more realistic simulation about this point. | |
43 | // Use case: | |
44 | // root [0] AliTOFT0v1 * tzero = new AliTOFT0v1("galice.root") | |
45 | // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated | |
46 | // root [1] tzero->ExecuteTask() | |
47 | // root [2] tzero->ExecuteTask("tim") | |
48 | // // available parameters: | |
49 | // tim - print benchmarking information | |
50 | // all - print usefull informations about the number of misidentified tracks | |
51 | // and a comparison about the true configuration (known from MC) and the best | |
52 | // assignment | |
53 | // Different Selections for pp and Pb-Pb: Momentum Range, Max Time, # pions | |
54 | //-- Author: F. Pierella | |
6a4e212e | 55 | //-- Mod By Silvia Arcelli, Francesco Noferini, Barbara Guerzoni |
536031f2 | 56 | ////////////////////////////////////////////////////////////////////////////// |
57 | ||
536031f2 | 58 | #include "AliESDtrack.h" |
8f589502 | 59 | #include "AliESDEvent.h" |
03bd764d | 60 | #include "AliTOFT0v1.h" |
536031f2 | 61 | |
62 | ClassImp(AliTOFT0v1) | |
63 | ||
64 | //____________________________________________________________________________ | |
8f589502 | 65 | AliTOFT0v1::AliTOFT0v1(): |
5b4ed716 | 66 | TObject(), |
03bd764d | 67 | fLowerMomBound(0.5), |
5b4ed716 | 68 | fUpperMomBound(3), |
8f589502 | 69 | fTimeResolution(0.80e-10), |
70 | fTimeCorr(0.), | |
03bd764d | 71 | fEvent(0x0) |
72 | // fCalib(0x0) | |
536031f2 | 73 | { |
8f589502 | 74 | // |
75 | // default constructor | |
76 | // | |
536031f2 | 77 | |
5b4ed716 | 78 | Init(NULL); |
79 | ||
8f589502 | 80 | } |
81 | ||
82 | ||
83 | //____________________________________________________________________________ | |
84 | AliTOFT0v1::AliTOFT0v1(AliESDEvent* event): | |
5b4ed716 | 85 | TObject(), |
03bd764d | 86 | fLowerMomBound(0.5), |
5b4ed716 | 87 | fUpperMomBound(3.0), |
8f589502 | 88 | fTimeResolution(0.80e-10), |
89 | fTimeCorr(0.), | |
03bd764d | 90 | fEvent(event) |
91 | // fCalib(0x0) | |
8f589502 | 92 | { |
93 | // | |
94 | // real constructor | |
95 | // | |
96 | ||
5b4ed716 | 97 | Init(event); |
8f589502 | 98 | |
536031f2 | 99 | } |
100 | ||
5b4ed716 | 101 | /* copy-constructor and operator= suppresed |
102 | ||
536031f2 | 103 | //____________________________________________________________________________ |
8f589502 | 104 | AliTOFT0v1::AliTOFT0v1(const AliTOFT0v1 & tzero): |
105 | TObject(), | |
106 | fLowerMomBound(tzero.fLowerMomBound), | |
107 | fUpperMomBound(tzero.fUpperMomBound), | |
108 | fTimeResolution(tzero.fTimeResolution), | |
109 | fTimeCorr(tzero.fTimeCorr), | |
03bd764d | 110 | fEvent(tzero.fEvent) |
111 | // fCalib(tzero.fCalib) | |
536031f2 | 112 | { |
8f589502 | 113 | // |
114 | // copy constructor | |
115 | // | |
116 | ||
117 | fT0SigmaT0def[0]=tzero.fT0SigmaT0def[0]; | |
118 | fT0SigmaT0def[1]=tzero.fT0SigmaT0def[1]; | |
119 | fT0SigmaT0def[2]=tzero.fT0SigmaT0def[2]; | |
120 | fT0SigmaT0def[3]=tzero.fT0SigmaT0def[3]; | |
121 | ||
536031f2 | 122 | } |
123 | ||
8f589502 | 124 | //____________________________________________________________________________ |
125 | AliTOFT0v1& AliTOFT0v1::operator=(const AliTOFT0v1 &tzero) | |
126 | { | |
127 | // | |
128 | // assign. operator | |
129 | // | |
130 | ||
131 | if (this == &tzero) | |
132 | return *this; | |
133 | ||
134 | fLowerMomBound=tzero.fLowerMomBound; | |
135 | fUpperMomBound=tzero.fUpperMomBound; | |
136 | fTimeResolution=tzero.fTimeResolution; | |
137 | fTimeCorr=tzero.fTimeCorr; | |
138 | fEvent=tzero.fEvent; | |
03bd764d | 139 | // fCalib=tzero.fCalib; |
8f589502 | 140 | fT0SigmaT0def[0]=tzero.fT0SigmaT0def[0]; |
141 | fT0SigmaT0def[1]=tzero.fT0SigmaT0def[1]; | |
142 | fT0SigmaT0def[2]=tzero.fT0SigmaT0def[2]; | |
143 | fT0SigmaT0def[3]=tzero.fT0SigmaT0def[3]; | |
144 | ||
145 | return *this; | |
146 | } | |
5b4ed716 | 147 | |
148 | */ | |
536031f2 | 149 | //____________________________________________________________________________ |
150 | AliTOFT0v1::~AliTOFT0v1() | |
151 | { | |
152 | // dtor | |
03bd764d | 153 | // fCalib=NULL; |
8f589502 | 154 | fEvent=NULL; |
155 | ||
536031f2 | 156 | } |
5b4ed716 | 157 | //____________________________________________________________________________ |
158 | ||
159 | void | |
160 | AliTOFT0v1::Init(AliESDEvent *event) | |
161 | { | |
162 | ||
163 | /* | |
164 | * init | |
165 | */ | |
166 | ||
167 | fEvent = event; | |
168 | fT0SigmaT0def[0]=0.; | |
169 | fT0SigmaT0def[1]=0.6; | |
170 | fT0SigmaT0def[2]=0.; | |
171 | fT0SigmaT0def[3]=0.; | |
172 | ||
173 | } | |
174 | ||
8f589502 | 175 | //____________________________________________________________________________ |
536031f2 | 176 | void AliTOFT0v1::SetTimeResolution(Double_t timeresolution){ |
8f589502 | 177 | // Set the TOF time resolution |
536031f2 | 178 | fTimeResolution=timeresolution; |
179 | } | |
180 | //____________________________________________________________________________ | |
181 | //____________________________________________________________________________ | |
182 | Double_t * AliTOFT0v1::DefineT0(Option_t *option) | |
183 | { | |
8f589502 | 184 | // Caluclate the Event Time using the ESD TOF time |
185 | ||
5b4ed716 | 186 | fT0SigmaT0def[0]=0.; |
187 | fT0SigmaT0def[1]=0.600; | |
188 | fT0SigmaT0def[2]=0.; | |
189 | fT0SigmaT0def[3]=0.; | |
190 | ||
03bd764d | 191 | Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns] |
536031f2 | 192 | |
193 | const Int_t nmaxtracksinset=10; | |
6a4e212e | 194 | // if(strstr(option,"all")){ |
195 | // cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl; | |
196 | // cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl; | |
197 | // } | |
536031f2 | 198 | |
536031f2 | 199 | Int_t nsets=0; |
8f589502 | 200 | Int_t nUsedTracks=0; |
536031f2 | 201 | Int_t ngoodsetsSel= 0; |
202 | Float_t t0bestSel[300]; | |
8f589502 | 203 | Float_t eT0bestSel[300]; |
204 | Float_t chiSquarebestSel[300]; | |
205 | Float_t confLevelbestSel[300]; | |
536031f2 | 206 | Float_t t0bestallSel=0.; |
8f589502 | 207 | Float_t eT0bestallSel=0.; |
536031f2 | 208 | Float_t sumWt0bestallSel=0.; |
8f589502 | 209 | Float_t eMeanTzeroPi=0.; |
536031f2 | 210 | Float_t meantzeropi=0.; |
211 | Float_t sumAllweightspi=0.; | |
212 | Double_t t0def=-999; | |
213 | Double_t deltat0def=999; | |
214 | Int_t ngoodtrktrulyused=0; | |
215 | Int_t ntracksinsetmyCut = 0; | |
216 | ||
217 | Int_t ntrk=fEvent->GetNumberOfTracks(); | |
218 | ||
219 | AliESDtrack **tracks=new AliESDtrack*[ntrk]; | |
220 | Int_t ngoodtrk=0; | |
221 | Int_t ngoodtrkt0 =0; | |
222 | Float_t mintime =1E6; | |
223 | ||
224 | // First Track loop, Selection of good tracks | |
225 | ||
226 | for (Int_t itrk=0; itrk<ntrk; itrk++) { | |
227 | AliESDtrack *t=fEvent->GetTrack(itrk); | |
228 | Double_t momOld=t->GetP(); | |
229 | Double_t mom=momOld-0.0036*momOld; | |
230 | if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue; | |
03bd764d | 231 | if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue; |
536031f2 | 232 | Double_t time=t->GetTOFsignal(); |
233 | ||
234 | time*=1.E-3; // tof given in nanoseconds | |
235 | if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue; | |
14b2cbea | 236 | |
237 | if (!AcceptTrack(t)) continue; | |
536031f2 | 238 | |
9c89b8bd | 239 | if(t->GetIntegratedLength() < 350)continue; //skip decays |
536031f2 | 240 | if(time <= mintime) mintime=time; |
241 | tracks[ngoodtrk]=t; | |
242 | ngoodtrk++; | |
243 | } | |
244 | ||
245 | ||
03bd764d | 246 | // cout << " N. of ESD tracks : " << ntrk << endl; |
247 | // cout << " N. of preselected tracks : " << ngoodtrk << endl; | |
248 | // cout << " Minimum tof time in set (in ns) : " << mintime << endl; | |
536031f2 | 249 | |
250 | AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk]; | |
251 | ||
252 | for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) { | |
253 | AliESDtrack *t=tracks[jtrk]; | |
254 | Double_t time=t->GetTOFsignal(); | |
255 | ||
256 | if((time-mintime*1.E3)<50.E3){ // For pp and per | |
257 | gtracks[ngoodtrkt0]=t; | |
258 | ngoodtrkt0++; | |
259 | } | |
260 | } | |
261 | ||
262 | ||
263 | Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1; | |
264 | Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq; | |
265 | if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++; | |
266 | ||
267 | if(ngoodtrkt0<2){ | |
6a4e212e | 268 | // cout << "less than 2 tracks, skip event " << endl; |
536031f2 | 269 | t0def=-999; |
270 | deltat0def=0.600; | |
271 | fT0SigmaT0def[0]=t0def; | |
272 | fT0SigmaT0def[1]=deltat0def; | |
273 | fT0SigmaT0def[2]=ngoodtrkt0; | |
274 | fT0SigmaT0def[3]=ngoodtrkt0; | |
275 | //goto finish; | |
276 | } | |
277 | if(ngoodtrkt0>=2){ | |
278 | // Decide how many tracks in set | |
03bd764d | 279 | Int_t ntracksinset = std::min(ngoodtrkt0,nmaxtracksinsetCurrent); |
536031f2 | 280 | Int_t nset=1; |
281 | ||
282 | if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;} | |
6a4e212e | 283 | |
536031f2 | 284 | // Loop over selected sets |
285 | ||
286 | if(nset>=1){ | |
287 | for (Int_t i=0; i< nset; i++) { | |
288 | ||
289 | Float_t t0best=999.; | |
8f589502 | 290 | Float_t eT0best=999.; |
536031f2 | 291 | Float_t chisquarebest=99999.; |
292 | Int_t npionbest=0; | |
293 | ||
294 | Int_t ntracksinsetmy=0; | |
295 | AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset]; | |
296 | for (Int_t itrk=0; itrk<ntracksinset; itrk++) { | |
297 | Int_t index = itrk+i*ntracksinset; | |
298 | if(index < ngoodtrkt0){ | |
299 | AliESDtrack *t=gtracks[index]; | |
300 | tracksT0[itrk]=t; | |
301 | ntracksinsetmy++; | |
302 | } | |
303 | } | |
304 | ||
305 | // Analyse it | |
306 | ||
307 | Int_t assparticle[nmaxtracksinset]; | |
308 | Float_t exptof[nmaxtracksinset][3]; | |
309 | Float_t timeofflight[nmaxtracksinset]; | |
310 | Float_t momentum[nmaxtracksinset]; | |
311 | Float_t timezero[nmaxtracksinset]; | |
312 | Float_t weightedtimezero[nmaxtracksinset]; | |
313 | Float_t beta[nmaxtracksinset]; | |
314 | Float_t texp[nmaxtracksinset]; | |
315 | Float_t dtexp[nmaxtracksinset]; | |
316 | Float_t sqMomError[nmaxtracksinset]; | |
317 | Float_t sqTrackError[nmaxtracksinset]; | |
318 | Float_t massarray[3]={0.13957,0.493677,0.9382723}; | |
319 | Float_t tracktoflen[nmaxtracksinset]; | |
320 | Float_t besttimezero[nmaxtracksinset]; | |
321 | Float_t besttexp[nmaxtracksinset]; | |
322 | Float_t besttimeofflight[nmaxtracksinset]; | |
323 | Float_t bestmomentum[nmaxtracksinset]; | |
324 | Float_t bestchisquare[nmaxtracksinset]; | |
325 | Float_t bestweightedtimezero[nmaxtracksinset]; | |
326 | Float_t bestsqTrackError[nmaxtracksinset]; | |
327 | Int_t imass[nmaxtracksinset]; | |
328 | ||
329 | for (Int_t j=0; j<ntracksinset; j++) { | |
330 | assparticle[j] = 3; | |
331 | timeofflight[j] = 0; | |
332 | momentum[j] = 0; | |
333 | timezero[j] = 0; | |
334 | weightedtimezero[j] = 0; | |
335 | beta[j] = 0; | |
336 | texp[j] = 0; | |
337 | dtexp[j] = 0; | |
338 | sqMomError[j] = 0; | |
339 | sqTrackError[j] = 0; | |
340 | tracktoflen[j] = 0; | |
341 | besttimezero[j] = 0; | |
342 | besttexp[j] = 0; | |
343 | besttimeofflight[j] = 0; | |
344 | bestmomentum[j] = 0; | |
345 | bestchisquare[j] = 0; | |
346 | bestweightedtimezero[j] = 0; | |
347 | bestsqTrackError[j] = 0; | |
348 | imass[j] = 1; | |
349 | } | |
350 | ||
351 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
352 | AliESDtrack *t=tracksT0[j]; | |
353 | Double_t momOld=t->GetP(); | |
354 | Double_t mom=momOld-0.0036*momOld; | |
355 | Double_t time=t->GetTOFsignal(); | |
356 | ||
357 | time*=1.E-3; // tof given in nanoseconds | |
358 | Double_t exptime[10]; t->GetIntegratedTimes(exptime); | |
359 | Double_t toflen=t->GetIntegratedLength(); | |
360 | toflen=toflen/100.; // toflen given in m | |
361 | ||
8f589502 | 362 | timeofflight[j]=time; |
363 | tracktoflen[j]=toflen; | |
536031f2 | 364 | exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns |
365 | exptof[j][1]=exptime[3]*1.E-3+fTimeCorr; | |
366 | exptof[j][2]=exptime[4]*1.E-3+fTimeCorr; | |
367 | momentum[j]=mom; | |
368 | assparticle[j]=3; | |
369 | ||
370 | } //end for (Int_t j=0; j<ntracksinsetmy; j++) { | |
371 | ||
536031f2 | 372 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { |
373 | beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0] | |
374 | +momentum[itz]*momentum[itz]); | |
375 | 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])); | |
376 | sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns | |
377 | timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns | |
378 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
379 | sumAllweightspi+=1./sqTrackError[itz]; | |
380 | meantzeropi+=weightedtimezero[itz]; | |
381 | } // end loop for (Int_t itz=0; itz< ntracksinset;itz++) | |
382 | ||
383 | ||
384 | // Then, Combinatorial Algorithm | |
385 | ||
386 | if(ntracksinsetmy<2 )break; | |
387 | ||
388 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
389 | imass[j] = 3; | |
390 | } | |
391 | ||
392 | Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy)); | |
393 | ||
394 | // Loop on mass hypotheses | |
395 | for (Int_t k=0; k < ncombinatorial;k++) { | |
396 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
397 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
398 | texp[j]=exptof[j][imass[j]]; | |
399 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
400 | } | |
401 | Float_t sumAllweights=0.; | |
402 | Float_t meantzero=0.; | |
8f589502 | 403 | Float_t eMeanTzero=0.; |
536031f2 | 404 | |
405 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
406 | sqTrackError[itz]= | |
407 | (timeresolutioninns* | |
408 | timeresolutioninns | |
409 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
410 | ||
411 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
412 | ||
413 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
414 | sumAllweights+=1./sqTrackError[itz]; | |
415 | meantzero+=weightedtimezero[itz]; | |
416 | ||
417 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
418 | ||
419 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
8f589502 | 420 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] |
536031f2 | 421 | |
422 | // calculate chisquare | |
423 | ||
424 | Float_t chisquare=0.; | |
425 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
426 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
427 | ||
428 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
429 | ||
430 | if(chisquare<=chisquarebest){ | |
431 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
432 | ||
433 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
434 | besttimezero[iqsq]=timezero[iqsq]; | |
435 | bestmomentum[iqsq]=momentum[iqsq]; | |
436 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
437 | besttexp[iqsq]=texp[iqsq]; | |
438 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
439 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
440 | } | |
441 | ||
442 | Int_t npion=0; | |
443 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
444 | assparticle[j]=imass[j]; | |
445 | if(imass[j] == 0) npion++; | |
446 | } | |
447 | npionbest=npion; | |
448 | chisquarebest=chisquare; | |
449 | t0best=meantzero; | |
8f589502 | 450 | eT0best=eMeanTzero; |
536031f2 | 451 | } // close if(dummychisquare<=chisquare) |
452 | ||
453 | } | |
454 | ||
455 | Double_t chi2cut[nmaxtracksinset]; | |
456 | chi2cut[0] = 0; | |
457 | chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01 | |
458 | for (Int_t j=2; j<ntracksinset; j++) { | |
459 | chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.); | |
460 | } | |
461 | ||
462 | Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy; | |
463 | ||
03bd764d | 464 | // printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]); |
536031f2 | 465 | |
466 | Bool_t kRedoT0 = kFALSE; | |
467 | ntracksinsetmyCut = ntracksinsetmy; | |
468 | Bool_t usetrack[nmaxtracksinset]; | |
469 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
470 | usetrack[icsq] = kTRUE; | |
471 | if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){ | |
472 | kRedoT0 = kTRUE; | |
473 | ntracksinsetmyCut--; | |
474 | usetrack[icsq] = kFALSE; | |
475 | } | |
476 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
477 | ||
6a4e212e | 478 | // printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut); |
536031f2 | 479 | |
480 | // Loop on mass hypotheses Redo | |
481 | if(kRedoT0 && ntracksinsetmyCut > 1){ | |
6a4e212e | 482 | // printf("Redo T0\n"); |
536031f2 | 483 | for (Int_t k=0; k < ncombinatorial;k++) { |
484 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
485 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
486 | texp[j]=exptof[j][imass[j]]; | |
487 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
488 | } | |
489 | ||
490 | Float_t sumAllweights=0.; | |
491 | Float_t meantzero=0.; | |
8f589502 | 492 | Float_t eMeanTzero=0.; |
536031f2 | 493 | |
494 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
495 | if(! usetrack[itz]) continue; | |
496 | sqTrackError[itz]= | |
497 | (timeresolutioninns* | |
498 | timeresolutioninns | |
499 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
500 | ||
501 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
502 | ||
503 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
504 | sumAllweights+=1./sqTrackError[itz]; | |
505 | meantzero+=weightedtimezero[itz]; | |
506 | ||
507 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
508 | ||
509 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
8f589502 | 510 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] |
536031f2 | 511 | |
512 | // calculate chisquare | |
513 | ||
514 | Float_t chisquare=0.; | |
515 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
516 | if(! usetrack[icsq]) continue; | |
517 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
518 | ||
519 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
520 | ||
521 | Int_t npion=0; | |
522 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
523 | assparticle[j]=imass[j]; | |
524 | if(imass[j] == 0) npion++; | |
525 | } | |
526 | ||
527 | if(chisquare<=chisquarebest){ | |
528 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
529 | if(! usetrack[iqsq]) continue; | |
530 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
531 | besttimezero[iqsq]=timezero[iqsq]; | |
532 | bestmomentum[iqsq]=momentum[iqsq]; | |
533 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
534 | besttexp[iqsq]=texp[iqsq]; | |
535 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
536 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
537 | } | |
538 | ||
539 | npionbest=npion; | |
540 | chisquarebest=chisquare; | |
541 | t0best=meantzero; | |
8f589502 | 542 | eT0best=eMeanTzero; |
536031f2 | 543 | } // close if(dummychisquare<=chisquare) |
544 | ||
545 | } | |
546 | } | |
6a4e212e | 547 | |
536031f2 | 548 | // filling histos |
549 | Float_t confLevel=999; | |
550 | ||
551 | // Sets with decent chisquares | |
552 | ||
553 | if(chisquarebest<999.){ | |
554 | Double_t dblechisquare=(Double_t)chisquarebest; | |
555 | confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1); | |
03bd764d | 556 | // cout << " Set Number " << nsets << endl; |
557 | // cout << "Best Assignment, selection " << assparticle[0] << | |
558 | // assparticle[1] << assparticle[2] << | |
559 | // assparticle[3] << assparticle[4] << | |
560 | // assparticle[5] << endl; | |
561 | // cout << " Chisquare of the set "<< chisquarebest <<endl; | |
562 | // cout << " C.L. of the set "<< confLevel <<endl; | |
563 | // cout << " T0 for this set (in ns) " << t0best << endl; | |
536031f2 | 564 | |
565 | for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){ | |
566 | ||
567 | if(! usetrack[icsq]) continue; | |
568 | ||
03bd764d | 569 | // cout << "Track # " << icsq << " T0 offsets = " |
570 | // << besttimezero[icsq]-t0best << | |
571 | // " track error = " << bestsqTrackError[icsq] | |
572 | // << " Chisquare = " << bestchisquare[icsq] | |
573 | // << " Momentum = " << bestmomentum[icsq] | |
574 | // << " TOF = " << besttimeofflight[icsq] | |
575 | // << " TOF tracking = " << besttexp[icsq] | |
576 | // << " is used = " << usetrack[icsq] << endl; | |
536031f2 | 577 | } |
578 | ||
579 | // Pick up only those with C.L. >1% | |
580 | // if(confLevel>0.01 && ngoodsetsSel<200){ | |
581 | if(confLevel>0.01 && ngoodsetsSel<200){ | |
8f589502 | 582 | chiSquarebestSel[ngoodsetsSel]=chisquarebest; |
583 | confLevelbestSel[ngoodsetsSel]=confLevel; | |
584 | t0bestSel[ngoodsetsSel]=t0best/eT0best/eT0best; | |
585 | eT0bestSel[ngoodsetsSel]=1./eT0best/eT0best; | |
586 | t0bestallSel += t0best/eT0best/eT0best; | |
587 | sumWt0bestallSel += 1./eT0best/eT0best; | |
536031f2 | 588 | ngoodsetsSel++; |
589 | ngoodtrktrulyused+=ntracksinsetmyCut; | |
590 | } | |
591 | else{ | |
6a4e212e | 592 | // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy); |
536031f2 | 593 | } |
594 | } | |
595 | delete[] tracksT0; | |
596 | nsets++; | |
597 | ||
598 | } // end for the current set | |
599 | ||
8f589502 | 600 | nUsedTracks = ngoodtrkt0; |
536031f2 | 601 | if(strstr(option,"all")){ |
602 | if(sumAllweightspi>0.){ | |
603 | meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns] | |
8f589502 | 604 | eMeanTzeroPi=sqrt(1./sumAllweightspi); // it is given in [ns] |
536031f2 | 605 | } |
606 | ||
607 | if(sumWt0bestallSel>0){ | |
608 | t0bestallSel = t0bestallSel/sumWt0bestallSel; | |
8f589502 | 609 | eT0bestallSel = sqrt(1./sumWt0bestallSel); |
536031f2 | 610 | |
611 | }// end of if(sumWt0bestallSel>0){ | |
612 | ||
6a4e212e | 613 | // cout << "T0 all " << t0bestallSel << " +/- " << eT0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl; |
536031f2 | 614 | } |
615 | ||
616 | t0def=t0bestallSel; | |
8f589502 | 617 | deltat0def=eT0bestallSel; |
618 | if ((TMath::Abs(t0bestallSel) < 0.001)&&(TMath::Abs(eT0bestallSel)<0.001)){ | |
536031f2 | 619 | t0def=-999; deltat0def=0.600; |
620 | } | |
621 | ||
622 | fT0SigmaT0def[0]=t0def; | |
5b4ed716 | 623 | fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*ngoodtrktrulyused/(ngoodtrktrulyused-1)); |
6a4e212e | 624 | fT0SigmaT0def[2]=ngoodtrkt0; |
536031f2 | 625 | fT0SigmaT0def[3]=ngoodtrktrulyused; |
626 | } | |
627 | } | |
628 | ||
6a4e212e | 629 | // if(strstr(option,"tim") || strstr(option,"all")){ |
630 | // cout << "AliTOFT0v1:" << endl ; | |
631 | //} | |
536031f2 | 632 | |
5b4ed716 | 633 | if(fT0SigmaT0def[1] < 0.01) fT0SigmaT0def[1] = 0.6; |
634 | ||
635 | return fT0SigmaT0def; | |
636 | } | |
637 | //__________________________________________________________________ | |
638 | Double_t * AliTOFT0v1::DefineT0(Option_t *option,Float_t pMinCut,Float_t pMaxCut) | |
639 | { | |
640 | // Caluclate the Event Time using the ESD TOF time | |
641 | ||
642 | fT0SigmaT0def[0]=0.; | |
643 | fT0SigmaT0def[1]=0.600; | |
644 | fT0SigmaT0def[2]=0.; | |
645 | fT0SigmaT0def[3]=0.; | |
646 | ||
647 | Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns] | |
648 | ||
649 | const Int_t nmaxtracksinset=10; | |
650 | // if(strstr(option,"all")){ | |
651 | // cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl; | |
652 | // cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl; | |
653 | // } | |
654 | ||
655 | ||
656 | Int_t nsets=0; | |
657 | Int_t nUsedTracks=0; | |
658 | Int_t ngoodsetsSel= 0; | |
659 | Float_t t0bestSel[300]; | |
660 | Float_t eT0bestSel[300]; | |
661 | Float_t chiSquarebestSel[300]; | |
662 | Float_t confLevelbestSel[300]; | |
663 | Float_t t0bestallSel=0.; | |
664 | Float_t eT0bestallSel=0.; | |
665 | Float_t sumWt0bestallSel=0.; | |
666 | Float_t eMeanTzeroPi=0.; | |
667 | Float_t meantzeropi=0.; | |
668 | Float_t sumAllweightspi=0.; | |
669 | Double_t t0def=-999; | |
670 | Double_t deltat0def=999; | |
671 | Int_t ngoodtrktrulyused=0; | |
672 | Int_t ntracksinsetmyCut = 0; | |
673 | ||
674 | Int_t ntrk=fEvent->GetNumberOfTracks(); | |
675 | ||
676 | AliESDtrack **tracks=new AliESDtrack*[ntrk]; | |
677 | Int_t ngoodtrk=0; | |
678 | Int_t ngoodtrkt0 =0; | |
679 | Float_t mintime =1E6; | |
680 | ||
681 | // First Track loop, Selection of good tracks | |
682 | ||
683 | for (Int_t itrk=0; itrk<ntrk; itrk++) { | |
684 | AliESDtrack *t=fEvent->GetTrack(itrk); | |
685 | Double_t momOld=t->GetP(); | |
686 | Double_t mom=momOld-0.0036*momOld; | |
687 | if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue; | |
688 | if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue; | |
689 | Double_t time=t->GetTOFsignal(); | |
690 | ||
691 | time*=1.E-3; // tof given in nanoseconds | |
692 | if (!(mom<=fUpperMomBound && mom>=fLowerMomBound))continue; | |
693 | ||
694 | if (!AcceptTrack(t)) continue; | |
695 | ||
9c89b8bd | 696 | if(t->GetIntegratedLength() < 350)continue; //skip decays |
5b4ed716 | 697 | if(t->GetP() > pMinCut && t->GetP() < pMaxCut) continue; |
698 | if(time <= mintime) mintime=time; | |
699 | tracks[ngoodtrk]=t; | |
700 | ngoodtrk++; | |
701 | } | |
702 | ||
703 | ||
704 | // cout << " N. of ESD tracks : " << ntrk << endl; | |
705 | // cout << " N. of preselected tracks : " << ngoodtrk << endl; | |
706 | // cout << " Minimum tof time in set (in ns) : " << mintime << endl; | |
707 | ||
708 | AliESDtrack **gtracks=new AliESDtrack*[ngoodtrk]; | |
709 | ||
710 | for (Int_t jtrk=0; jtrk< ngoodtrk; jtrk++) { | |
711 | AliESDtrack *t=tracks[jtrk]; | |
712 | Double_t time=t->GetTOFsignal(); | |
713 | ||
714 | if((time-mintime*1.E3)<50.E3){ // For pp and per | |
715 | gtracks[ngoodtrkt0]=t; | |
716 | ngoodtrkt0++; | |
717 | } | |
718 | } | |
719 | ||
720 | ||
721 | Int_t nseteq = (ngoodtrkt0-1)/nmaxtracksinset + 1; | |
722 | Int_t nmaxtracksinsetCurrent=ngoodtrkt0/nseteq; | |
723 | if(nmaxtracksinsetCurrent*nseteq < ngoodtrkt0) nmaxtracksinsetCurrent++; | |
724 | ||
725 | if(ngoodtrkt0<2){ | |
726 | // cout << "less than 2 tracks, skip event " << endl; | |
727 | t0def=-999; | |
728 | deltat0def=0.600; | |
729 | fT0SigmaT0def[0]=t0def; | |
730 | fT0SigmaT0def[1]=deltat0def; | |
731 | fT0SigmaT0def[2]=ngoodtrkt0; | |
732 | fT0SigmaT0def[3]=ngoodtrkt0; | |
733 | //goto finish; | |
734 | } | |
735 | if(ngoodtrkt0>=2){ | |
736 | // Decide how many tracks in set | |
737 | Int_t ntracksinset = std::min(ngoodtrkt0,nmaxtracksinsetCurrent); | |
738 | Int_t nset=1; | |
739 | ||
740 | if(ngoodtrkt0>nmaxtracksinsetCurrent) {nset= (Int_t)(ngoodtrkt0/ntracksinset)+1;} | |
741 | ||
742 | // Loop over selected sets | |
743 | ||
744 | if(nset>=1){ | |
745 | for (Int_t i=0; i< nset; i++) { | |
746 | ||
747 | Float_t t0best=999.; | |
748 | Float_t eT0best=999.; | |
749 | Float_t chisquarebest=99999.; | |
750 | Int_t npionbest=0; | |
751 | ||
752 | Int_t ntracksinsetmy=0; | |
753 | AliESDtrack **tracksT0=new AliESDtrack*[ntracksinset]; | |
754 | for (Int_t itrk=0; itrk<ntracksinset; itrk++) { | |
755 | Int_t index = itrk+i*ntracksinset; | |
756 | if(index < ngoodtrkt0){ | |
757 | AliESDtrack *t=gtracks[index]; | |
758 | tracksT0[itrk]=t; | |
759 | ntracksinsetmy++; | |
760 | } | |
761 | } | |
762 | ||
763 | // Analyse it | |
764 | ||
765 | Int_t assparticle[nmaxtracksinset]; | |
766 | Float_t exptof[nmaxtracksinset][3]; | |
767 | Float_t timeofflight[nmaxtracksinset]; | |
768 | Float_t momentum[nmaxtracksinset]; | |
769 | Float_t timezero[nmaxtracksinset]; | |
770 | Float_t weightedtimezero[nmaxtracksinset]; | |
771 | Float_t beta[nmaxtracksinset]; | |
772 | Float_t texp[nmaxtracksinset]; | |
773 | Float_t dtexp[nmaxtracksinset]; | |
774 | Float_t sqMomError[nmaxtracksinset]; | |
775 | Float_t sqTrackError[nmaxtracksinset]; | |
776 | Float_t massarray[3]={0.13957,0.493677,0.9382723}; | |
777 | Float_t tracktoflen[nmaxtracksinset]; | |
778 | Float_t besttimezero[nmaxtracksinset]; | |
779 | Float_t besttexp[nmaxtracksinset]; | |
780 | Float_t besttimeofflight[nmaxtracksinset]; | |
781 | Float_t bestmomentum[nmaxtracksinset]; | |
782 | Float_t bestchisquare[nmaxtracksinset]; | |
783 | Float_t bestweightedtimezero[nmaxtracksinset]; | |
784 | Float_t bestsqTrackError[nmaxtracksinset]; | |
785 | Int_t imass[nmaxtracksinset]; | |
786 | ||
787 | for (Int_t j=0; j<ntracksinset; j++) { | |
788 | assparticle[j] = 3; | |
789 | timeofflight[j] = 0; | |
790 | momentum[j] = 0; | |
791 | timezero[j] = 0; | |
792 | weightedtimezero[j] = 0; | |
793 | beta[j] = 0; | |
794 | texp[j] = 0; | |
795 | dtexp[j] = 0; | |
796 | sqMomError[j] = 0; | |
797 | sqTrackError[j] = 0; | |
798 | tracktoflen[j] = 0; | |
799 | besttimezero[j] = 0; | |
800 | besttexp[j] = 0; | |
801 | besttimeofflight[j] = 0; | |
802 | bestmomentum[j] = 0; | |
803 | bestchisquare[j] = 0; | |
804 | bestweightedtimezero[j] = 0; | |
805 | bestsqTrackError[j] = 0; | |
806 | imass[j] = 1; | |
807 | } | |
808 | ||
809 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
810 | AliESDtrack *t=tracksT0[j]; | |
811 | Double_t momOld=t->GetP(); | |
812 | Double_t mom=momOld-0.0036*momOld; | |
813 | Double_t time=t->GetTOFsignal(); | |
814 | ||
815 | time*=1.E-3; // tof given in nanoseconds | |
816 | Double_t exptime[10]; t->GetIntegratedTimes(exptime); | |
817 | Double_t toflen=t->GetIntegratedLength(); | |
818 | toflen=toflen/100.; // toflen given in m | |
819 | ||
820 | timeofflight[j]=time; | |
821 | tracktoflen[j]=toflen; | |
822 | exptof[j][0]=exptime[2]*1.E-3+fTimeCorr;// in ns | |
823 | exptof[j][1]=exptime[3]*1.E-3+fTimeCorr; | |
824 | exptof[j][2]=exptime[4]*1.E-3+fTimeCorr; | |
825 | momentum[j]=mom; | |
826 | assparticle[j]=3; | |
827 | ||
828 | } //end for (Int_t j=0; j<ntracksinsetmy; j++) { | |
829 | ||
830 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
831 | beta[itz]=momentum[itz]/sqrt(massarray[0]*massarray[0] | |
832 | +momentum[itz]*momentum[itz]); | |
833 | 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])); | |
834 | sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); //in ns | |
835 | timezero[itz]=exptof[itz][0]-timeofflight[itz];// in ns | |
836 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
837 | sumAllweightspi+=1./sqTrackError[itz]; | |
838 | meantzeropi+=weightedtimezero[itz]; | |
839 | } // end loop for (Int_t itz=0; itz< ntracksinset;itz++) | |
840 | ||
841 | ||
842 | // Then, Combinatorial Algorithm | |
843 | ||
844 | if(ntracksinsetmy<2 )break; | |
845 | ||
846 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
847 | imass[j] = 3; | |
848 | } | |
849 | ||
850 | Int_t ncombinatorial = Int_t(TMath::Power(3,ntracksinsetmy)); | |
851 | ||
852 | // Loop on mass hypotheses | |
853 | for (Int_t k=0; k < ncombinatorial;k++) { | |
854 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
855 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j)))/Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
856 | texp[j]=exptof[j][imass[j]]; | |
857 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
858 | } | |
859 | Float_t sumAllweights=0.; | |
860 | Float_t meantzero=0.; | |
861 | Float_t eMeanTzero=0.; | |
862 | ||
863 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
864 | sqTrackError[itz]= | |
865 | (timeresolutioninns* | |
866 | timeresolutioninns | |
867 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
868 | ||
869 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
870 | ||
871 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
872 | sumAllweights+=1./sqTrackError[itz]; | |
873 | meantzero+=weightedtimezero[itz]; | |
874 | ||
875 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
876 | ||
877 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
878 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] | |
879 | ||
880 | // calculate chisquare | |
881 | ||
882 | Float_t chisquare=0.; | |
883 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
884 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
885 | ||
886 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
887 | ||
888 | if(chisquare<=chisquarebest){ | |
889 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
890 | ||
891 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
892 | besttimezero[iqsq]=timezero[iqsq]; | |
893 | bestmomentum[iqsq]=momentum[iqsq]; | |
894 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
895 | besttexp[iqsq]=texp[iqsq]; | |
896 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
897 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
898 | } | |
899 | ||
900 | Int_t npion=0; | |
901 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
902 | assparticle[j]=imass[j]; | |
903 | if(imass[j] == 0) npion++; | |
904 | } | |
905 | npionbest=npion; | |
906 | chisquarebest=chisquare; | |
907 | t0best=meantzero; | |
908 | eT0best=eMeanTzero; | |
909 | } // close if(dummychisquare<=chisquare) | |
910 | ||
911 | } | |
912 | ||
913 | Double_t chi2cut[nmaxtracksinset]; | |
914 | chi2cut[0] = 0; | |
915 | chi2cut[1] = 6.6; // corresponding to a C.L. of 0.01 | |
916 | for (Int_t j=2; j<ntracksinset; j++) { | |
917 | chi2cut[j] = chi2cut[1] * TMath::Sqrt(j*1.); | |
918 | } | |
919 | ||
920 | Double_t chi2singlecut = chi2cut[ntracksinsetmy-1]/ntracksinsetmy + TMath::Abs(chisquarebest-chi2cut[ntracksinsetmy-1])/ntracksinsetmy; | |
921 | ||
922 | // printf("tracks removed with a chi2 > %f (chi2total = %f w.r.t. the limit of %f)\n",chi2singlecut,chisquarebest,chi2cut[ntracksinsetmy-1]); | |
923 | ||
924 | Bool_t kRedoT0 = kFALSE; | |
925 | ntracksinsetmyCut = ntracksinsetmy; | |
926 | Bool_t usetrack[nmaxtracksinset]; | |
927 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
928 | usetrack[icsq] = kTRUE; | |
929 | if((bestchisquare[icsq] > chisquarebest*0.5 && ntracksinsetmy > 2) || (bestchisquare[icsq] > chi2singlecut)){ | |
930 | kRedoT0 = kTRUE; | |
931 | ntracksinsetmyCut--; | |
932 | usetrack[icsq] = kFALSE; | |
933 | } | |
934 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
935 | ||
936 | // printf("ntrackinsetmy = %i - %i\n",ntracksinsetmy,ntracksinsetmyCut); | |
937 | ||
938 | // Loop on mass hypotheses Redo | |
939 | if(kRedoT0 && ntracksinsetmyCut > 1){ | |
940 | // printf("Redo T0\n"); | |
941 | for (Int_t k=0; k < ncombinatorial;k++) { | |
942 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
943 | imass[j] = (k % Int_t(TMath::Power(3,ntracksinsetmy-j))) / Int_t(TMath::Power(3,ntracksinsetmy-j-1)); | |
944 | texp[j]=exptof[j][imass[j]]; | |
945 | dtexp[j]=GetMomError(imass[j], momentum[j], texp[j]); | |
946 | } | |
947 | ||
948 | Float_t sumAllweights=0.; | |
949 | Float_t meantzero=0.; | |
950 | Float_t eMeanTzero=0.; | |
951 | ||
952 | for (Int_t itz=0; itz<ntracksinsetmy;itz++) { | |
953 | if(! usetrack[itz]) continue; | |
954 | sqTrackError[itz]= | |
955 | (timeresolutioninns* | |
956 | timeresolutioninns | |
957 | +dtexp[itz]*dtexp[itz]*1E-6); //in ns2 | |
958 | ||
959 | timezero[itz]=texp[itz]-timeofflight[itz];// in ns | |
960 | ||
961 | weightedtimezero[itz]=timezero[itz]/sqTrackError[itz]; | |
962 | sumAllweights+=1./sqTrackError[itz]; | |
963 | meantzero+=weightedtimezero[itz]; | |
964 | ||
965 | } // end loop for (Int_t itz=0; itz<15;itz++) | |
966 | ||
967 | meantzero=meantzero/sumAllweights; // it is given in [ns] | |
968 | eMeanTzero=sqrt(1./sumAllweights); // it is given in [ns] | |
969 | ||
970 | // calculate chisquare | |
971 | ||
972 | Float_t chisquare=0.; | |
973 | for (Int_t icsq=0; icsq<ntracksinsetmy;icsq++) { | |
974 | if(! usetrack[icsq]) continue; | |
975 | chisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq]; | |
976 | ||
977 | } // end loop for (Int_t icsq=0; icsq<15;icsq++) | |
978 | ||
979 | Int_t npion=0; | |
980 | for (Int_t j=0; j<ntracksinsetmy; j++) { | |
981 | assparticle[j]=imass[j]; | |
982 | if(imass[j] == 0) npion++; | |
983 | } | |
984 | ||
985 | if(chisquare<=chisquarebest){ | |
986 | for(Int_t iqsq = 0; iqsq<ntracksinsetmy; iqsq++) { | |
987 | if(! usetrack[iqsq]) continue; | |
988 | bestsqTrackError[iqsq]=sqTrackError[iqsq]; | |
989 | besttimezero[iqsq]=timezero[iqsq]; | |
990 | bestmomentum[iqsq]=momentum[iqsq]; | |
991 | besttimeofflight[iqsq]=timeofflight[iqsq]; | |
992 | besttexp[iqsq]=texp[iqsq]; | |
993 | bestweightedtimezero[iqsq]=weightedtimezero[iqsq]; | |
994 | bestchisquare[iqsq]=(timezero[iqsq]-meantzero)*(timezero[iqsq]-meantzero)/sqTrackError[iqsq]; | |
995 | } | |
996 | ||
997 | npionbest=npion; | |
998 | chisquarebest=chisquare; | |
999 | t0best=meantzero; | |
1000 | eT0best=eMeanTzero; | |
1001 | } // close if(dummychisquare<=chisquare) | |
1002 | ||
1003 | } | |
1004 | } | |
1005 | ||
1006 | // filling histos | |
1007 | Float_t confLevel=999; | |
1008 | ||
1009 | // Sets with decent chisquares | |
1010 | ||
1011 | if(chisquarebest<999.){ | |
1012 | Double_t dblechisquare=(Double_t)chisquarebest; | |
1013 | confLevel=(Float_t)TMath::Prob(dblechisquare,ntracksinsetmyCut-1); | |
1014 | // cout << " Set Number " << nsets << endl; | |
1015 | // cout << "Best Assignment, selection " << assparticle[0] << | |
1016 | // assparticle[1] << assparticle[2] << | |
1017 | // assparticle[3] << assparticle[4] << | |
1018 | // assparticle[5] << endl; | |
1019 | // cout << " Chisquare of the set "<< chisquarebest <<endl; | |
1020 | // cout << " C.L. of the set "<< confLevel <<endl; | |
1021 | // cout << " T0 for this set (in ns) " << t0best << endl; | |
1022 | ||
1023 | for(Int_t icsq=0; icsq<ntracksinsetmy;icsq++){ | |
1024 | ||
1025 | if(! usetrack[icsq]) continue; | |
1026 | ||
1027 | // cout << "Track # " << icsq << " T0 offsets = " | |
1028 | // << besttimezero[icsq]-t0best << | |
1029 | // " track error = " << bestsqTrackError[icsq] | |
1030 | // << " Chisquare = " << bestchisquare[icsq] | |
1031 | // << " Momentum = " << bestmomentum[icsq] | |
1032 | // << " TOF = " << besttimeofflight[icsq] | |
1033 | // << " TOF tracking = " << besttexp[icsq] | |
1034 | // << " is used = " << usetrack[icsq] << endl; | |
1035 | } | |
1036 | ||
1037 | // Pick up only those with C.L. >1% | |
1038 | // if(confLevel>0.01 && ngoodsetsSel<200){ | |
1039 | if(confLevel>0.01 && ngoodsetsSel<200){ | |
1040 | chiSquarebestSel[ngoodsetsSel]=chisquarebest; | |
1041 | confLevelbestSel[ngoodsetsSel]=confLevel; | |
1042 | t0bestSel[ngoodsetsSel]=t0best/eT0best/eT0best; | |
1043 | eT0bestSel[ngoodsetsSel]=1./eT0best/eT0best; | |
1044 | t0bestallSel += t0best/eT0best/eT0best; | |
1045 | sumWt0bestallSel += 1./eT0best/eT0best; | |
1046 | ngoodsetsSel++; | |
1047 | ngoodtrktrulyused+=ntracksinsetmyCut; | |
1048 | } | |
1049 | else{ | |
1050 | // printf("conflevel = %f -- ngoodsetsSel = %i -- ntrackset = %i\n",confLevel,ngoodsetsSel,ntracksinsetmy); | |
1051 | } | |
1052 | } | |
1053 | delete[] tracksT0; | |
1054 | nsets++; | |
1055 | ||
1056 | } // end for the current set | |
1057 | ||
1058 | nUsedTracks = ngoodtrkt0; | |
1059 | if(strstr(option,"all")){ | |
1060 | if(sumAllweightspi>0.){ | |
1061 | meantzeropi=meantzeropi/sumAllweightspi; // it is given in [ns] | |
1062 | eMeanTzeroPi=sqrt(1./sumAllweightspi); // it is given in [ns] | |
1063 | } | |
1064 | ||
1065 | if(sumWt0bestallSel>0){ | |
1066 | t0bestallSel = t0bestallSel/sumWt0bestallSel; | |
1067 | eT0bestallSel = sqrt(1./sumWt0bestallSel); | |
1068 | ||
1069 | }// end of if(sumWt0bestallSel>0){ | |
1070 | ||
1071 | // cout << "T0 all " << t0bestallSel << " +/- " << eT0bestallSel << "Number of tracks used: "<<ngoodtrktrulyused<<endl; | |
1072 | } | |
1073 | ||
1074 | t0def=t0bestallSel; | |
1075 | deltat0def=eT0bestallSel; | |
1076 | if ((TMath::Abs(t0bestallSel) < 0.001)&&(TMath::Abs(eT0bestallSel)<0.001)){ | |
1077 | t0def=-999; deltat0def=0.600; | |
1078 | } | |
1079 | ||
1080 | fT0SigmaT0def[0]=t0def; | |
1081 | fT0SigmaT0def[1]=TMath::Sqrt(deltat0def*deltat0def*ngoodtrktrulyused/(ngoodtrktrulyused-1)); | |
1082 | fT0SigmaT0def[2]=ngoodtrkt0; | |
1083 | fT0SigmaT0def[3]=ngoodtrktrulyused; | |
1084 | } | |
1085 | } | |
1086 | ||
1087 | // if(strstr(option,"tim") || strstr(option,"all")){ | |
1088 | // cout << "AliTOFT0v1:" << endl ; | |
1089 | //} | |
1090 | ||
1091 | if(fT0SigmaT0def[1] < 0.01) fT0SigmaT0def[1] = 0.6; | |
1092 | ||
536031f2 | 1093 | return fT0SigmaT0def; |
1094 | } | |
1095 | //__________________________________________________________________ | |
8f589502 | 1096 | Float_t AliTOFT0v1::GetMomError(Int_t index, Float_t mom, Float_t texp) const |
536031f2 | 1097 | { |
8f589502 | 1098 | // Take the error extimate for the TOF time in the track reconstruction |
536031f2 | 1099 | |
536031f2 | 1100 | static const Double_t kMasses[]={ |
1101 | 0.000511, 0.105658, 0.139570, 0.493677, 0.938272, 1.875613 | |
1102 | }; | |
1103 | ||
1104 | Double_t mass=kMasses[index+2]; | |
5b4ed716 | 1105 | Double_t dpp=0.02; //mean relative pt resolution; |
1106 | // if(mom > 1) dpp = 0.02*mom; | |
536031f2 | 1107 | Double_t sigma=dpp*texp*1E3/(1.+ mom*mom/(mass*mass)); |
1108 | ||
1109 | sigma =TMath::Sqrt(sigma*sigma); | |
1110 | ||
1111 | return sigma; | |
1112 | } | |
14b2cbea | 1113 | |
1114 | //__________________________________________________________________ | |
1115 | Bool_t AliTOFT0v1::AcceptTrack(AliESDtrack *track) | |
1116 | { | |
1117 | ||
1118 | /* TPC refit */ | |
1119 | if (!(track->GetStatus() & AliESDtrack::kTPCrefit)) return kFALSE; | |
1120 | /* do not accept kink daughters */ | |
1121 | if (track->GetKinkIndex(0)>0) return kFALSE; | |
1122 | /* N clusters TPC */ | |
1123 | if (track->GetTPCclusters(0) < 50) return kFALSE; | |
1124 | /* chi2 TPC */ | |
1125 | if (track->GetTPCchi2()/Float_t(track->GetTPCclusters(0)) > 3.5) return kFALSE; | |
1126 | /* sigma to vertex */ | |
1127 | if (GetSigmaToVertex(track) > 4.) return kFALSE; | |
1128 | ||
1129 | /* accept track */ | |
1130 | return kTRUE; | |
1131 | ||
1132 | } | |
1133 | ||
1134 | //____________________________________________________________________ | |
8f589502 | 1135 | Float_t AliTOFT0v1::GetSigmaToVertex(AliESDtrack* esdTrack) const |
14b2cbea | 1136 | { |
1137 | // Calculates the number of sigma to the vertex. | |
1138 | ||
1139 | Float_t b[2]; | |
1140 | Float_t bRes[2]; | |
1141 | Float_t bCov[3]; | |
1142 | esdTrack->GetImpactParameters(b,bCov); | |
1143 | ||
1144 | if (bCov[0]<=0 || bCov[2]<=0) { | |
1145 | bCov[0]=0; bCov[2]=0; | |
1146 | } | |
1147 | bRes[0] = TMath::Sqrt(bCov[0]); | |
1148 | bRes[1] = TMath::Sqrt(bCov[2]); | |
1149 | ||
1150 | // ----------------------------------- | |
1151 | // How to get to a n-sigma cut? | |
1152 | // | |
1153 | // The accumulated statistics from 0 to d is | |
1154 | // | |
1155 | // -> Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma) | |
1156 | // -> 1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma) | |
1157 | // | |
1158 | // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-d**2)/2) | |
1159 | // Can this be expressed in a different way? | |
1160 | ||
1161 | if (bRes[0] == 0 || bRes[1] ==0) | |
1162 | return -1; | |
1163 | ||
1164 | Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2)); | |
1165 | ||
1166 | // work around precision problem | |
1167 | // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :( | |
1168 | // 1e-15 corresponds to nsigma ~ 7.7 | |
1169 | if (TMath::Exp(-d * d / 2) < 1e-15) | |
1170 | return 1000; | |
1171 | ||
1172 | Float_t nSigma = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2); | |
1173 | return nSigma; | |
1174 | } |