t0 classes added and material update (steel added)
[u/mrichter/AliRoot.git] / TOF / AliTOFT0.cxx
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15
16 //_________________________________________________________________________
17 // This is a TTask that made the calculation of the Time zero using TOF.
18 // Description: The algorithm used to calculate the time zero of interaction
19 // using TOF detector is the following.
20 // We select in the MonteCarlo some primary particles - or tracks in the following - 
21 // that strike the TOF detector (the larger part are pions, kaons or protons). 
22 // We choose a set of 10 selected tracks, for each track You have the length
23 // of the track when the TOF is reached (a standard TOF hit does not contain this
24 // additional information, this is the reason why we implemented a new time zero 
25 // dedicated TOF hit class AliTOFhitT0; in order to store this type of hit You 
26 // have to use the AliTOFv4T0 as TOF class in Your Config.C. In AliTOFv4T0 the 
27 // StepManager was modified in order to fill the TOF hit branch with this type 
28 // of hits; in fact the AliTOF::AddT0Hit is called rather that the usual AliTOF::AddHit), 
29 // the momentum at generation (from TreeK) and the time of flight
30 // given by the TOF detector.
31 // (Observe that the ctor of the AliTOF class, when the AliTOFv4T0 class is used, is called
32 // with the "tzero" option: it is in order create the fHits TClonesArray filled with
33 // AliTOFhitT0 objects, rather than with normal AliTOFhit)
34 // Then Momentum and time of flight for each track are smeared according to 
35 // known experimental resolution (all sources of error have been token into account).
36 // Let consider now only one set of 10 tracks (the algorithm is the same for all sets).
37 // Assuming the (mass) hypothesis that each track can be AUT a pion, AUT a kaon, AUT a proton,
38 // we consider all the 3 at 10 possible cases. 
39 // For each track in each (mass) configuration
40 // (a configuration can be e.g. pion/pion/kaon/proton/pion/proton/kaon/kaon/pion/pion)
41 // we calculate the time zero (we know in fact the velocity of the track after 
42 // the assumption about its mass, the time of flight given by the TOF, and the 
43 // corresponding path travelled till the TOF detector). Then for each mass configuration we have
44 // 10 time zero and we can calculate the ChiSquare for the current configuration using the 
45 // weighted mean over all 10 time zero.
46 // We call the best assignment the mass configuration that gives the minimum value of the ChiSquare. 
47 // We plot the weighted mean over all 10 time zero for the best assignment, 
48 // the ChiSquare for the best assignment and the corresponding confidence level.
49 // The strong assumption is the MC selection of primary particles. It will be introduced
50 // in the future also some more realistic simulation about this point. 
51 // Use case:
52 // root [0] AliTOFT0 * tzero = new AliTOFT0("galice.root")
53 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
54 // root [1] tzero->ExecuteTask()
55 // root [2] tzero->ExecuteTask("tim")
56 //             // available parameters:
57 //             tim - print benchmarking information
58 //             all - print usefull informations about the number of misidentified tracks 
59 //                   and a comparison about the true configuration (known from MC) and the best
60 //                   assignment
61 //-- Author: F. Pierella
62 //////////////////////////////////////////////////////////////////////////////
63
64 #include "AliTOFT0.h"
65 #include "AliTOFhitT0.h"
66 #include "AliTOF.h"
67 #include "AliTOFv4T0.h"
68 #include "AliRun.h"
69 #include "AliDetector.h"
70 #include "AliMC.h"
71
72 #include "TH1.h"
73 #include "TFile.h"
74 #include "TTask.h"
75 #include "TTree.h"
76 #include "TSystem.h"
77 #include "TCanvas.h"
78 #include "TFrame.h"
79 #include "TROOT.h"
80 #include "TFolder.h"
81 #include "TBenchmark.h"
82 #include "TParticle.h"
83 #include "TClonesArray.h"
84 #include <stdlib.h>
85 #include <iostream.h>
86 #include <fstream.h>
87 #include <iomanip.h>
88
89 ClassImp(AliTOFT0)
90
91 //____________________________________________________________________________ 
92   AliTOFT0::AliTOFT0():TTask("AliTOFT0","") 
93 {
94   // ctor
95   fNevents = 0 ;     
96   fHits = 0 ;
97
98 }
99            
100 //____________________________________________________________________________ 
101   AliTOFT0::AliTOFT0(char* headerFile, Int_t nEvents):TTask("AliTOFT0","") 
102 {
103   fNevents=nEvents ; // Number of events for which calculate the T0, 
104                      // default 0: it means all evens in current file
105   fLowerMomBound=1.5; // [GeV/c] default value
106   fUpperMomBound=2. ; // [GeV/c] default value
107   fTimeResolution   = 1.2e-10; // 120 ps by default     
108   fHeadersFile = headerFile ;
109   fHits = 0 ;
110
111   TFile * file = (TFile*) gROOT->GetFile(fHeadersFile.Data() ) ;
112
113   //File was not opened yet
114   if(file == 0){
115     if(fHeadersFile.Contains("rfio"))
116       file =    TFile::Open(fHeadersFile,"update") ;
117     else
118       file = new TFile(fHeadersFile.Data(),"update") ;
119     gAlice = (AliRun *) file->Get("gAlice") ;
120   }
121
122   // add Task to //root/Tasks folder
123   TTask * roottasks = (TTask*)gROOT->GetRootFolder()->FindObject("Tasks") ; 
124   roottasks->Add(this) ; 
125 }
126
127 //____________________________________________________________________________ 
128   AliTOFT0::~AliTOFT0()
129 {
130   // dtor
131 }
132
133 //____________________________________________________________________________
134 void AliTOFT0::Exec(Option_t *option) 
135
136   //
137   // calculate T0 distribution for all events using chisquare 
138   //
139   Int_t ngood=0;
140   Int_t nmisidentified=0;
141   Int_t nmisidentified0=0;
142   Int_t nmisidentified1=0;
143   Int_t nmisidentified2=0;
144   Int_t nmisidentified3=0;
145   Int_t nmisidentified4=0;
146   Int_t nmisidentified5=0;
147   Int_t nmisidentified6=0;
148   Int_t nmisidentified7=0;
149   Int_t nmisidentified8=0;
150   Int_t nmisidentified9=0;
151   Int_t ipartold = -1;
152   Int_t ipart;
153   Int_t selected=0;
154   Int_t istop=0;
155   Float_t timeresolutioninns=fTimeResolution*(1.e+9); // convert in [ns]
156   const Int_t kUPDATE = 5; // for visual option
157   Int_t itimes=0;
158   TCanvas* c1=0;
159   TCanvas* c2=0;
160   TCanvas* c3=0;
161
162   if(strstr(option,"visual")){
163     // Create a new canvas.
164     //c1 = new TCanvas("c1","Dynamic Visual Filling of time zero histo",10,10,500,500);
165     c1 = new TCanvas("c1","Dynamic Visual Filling of time zero histo",10,10,370,370);
166     c1->SetFillColor(35);
167     c1->GetFrame()->SetFillColor(21);
168     c1->GetFrame()->SetBorderSize(6);
169     c1->GetFrame()->SetBorderMode(-1);
170
171     //c2 = new TCanvas("c2","Dynamic Visual Filling of chisquare histo",550,10,500,500);
172     c2 = new TCanvas("c2","Dynamic Visual Filling of chisquare histo",380,10,370,370);
173     c2->SetFillColor(35);
174     c2->GetFrame()->SetFillColor(21);
175     c2->GetFrame()->SetBorderSize(6);
176     c2->GetFrame()->SetBorderMode(-1);
177
178     //c3 = new TCanvas("c3","Dynamic Visual Filling of confidence level histo",280,550,500,500);
179     c3 = new TCanvas("c3","Dynamic Visual Filling of confidence level histo",760,10,370,370);
180     c3->SetFillColor(35);
181     c3->GetFrame()->SetFillColor(21);
182     c3->GetFrame()->SetBorderSize(6);
183     c3->GetFrame()->SetBorderMode(-1);
184   }
185
186   if(strstr(option,"tim") || strstr(option,"all"))
187     gBenchmark->Start("TOFT0");
188
189   TH1F *htzerobest= new TH1F("htzerobest","T0 for best assignment",200,-1.,1.);
190   TH1F* hchibest  = new TH1F("hchibest","ChiSquare Min Distribution",80,0.,40.);
191   TH1F* hchibestconflevel  = new TH1F("hchibestconflevel","ChiSquare Min Confidence Level",10,0.,1.);
192
193   // setting histo colors
194   if(strstr(option,"visual")){
195     htzerobest->SetFillColor(48);
196     hchibest->SetFillColor(50);
197     hchibestconflevel->SetFillColor(52);
198   }
199
200   Int_t   assparticle[10]={3,3,3,3,3,3,3,3,3,3};
201   Int_t   truparticle[10]={3,3,3,3,3,3,3,3,3,3};
202   Float_t t0best=999.;
203   Float_t timeofflight[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
204   Float_t momentum[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
205   Float_t timezero[10];
206   Float_t weightedtimezero[10];
207   Float_t beta[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
208   Float_t sqMomError[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
209   Float_t sqTrackError[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
210   Float_t massarray[3]={0.13957,0.493677,0.9382723};
211   Float_t dummychisquare=0.;
212   Float_t chisquare=999.;
213   Float_t tracktoflen[10]={0.,0.,0.,0.,0.,0.,0.,0.,0.,0.};
214
215   AliTOF *TOF = (AliTOF *) gAlice->GetDetector ("TOF");
216
217   if (!TOF) {
218     Error("AliTOFT0","TOF not found");
219     return;
220   }
221
222   if(strstr(option,"all")){
223     cout << "Selecting primary tracks with momentum between " << fLowerMomBound << " GeV/c and " << fUpperMomBound << " GeV/c" << endl;
224     cout << "Memorandum: 0 means PION | 1 means KAON | 2 means PROTON" << endl;
225   }
226
227   if (fNevents == 0) fNevents = (Int_t) gAlice->TreeE()->GetEntries();
228
229   for (Int_t ievent = 0; ievent < fNevents; ievent++) {
230     gAlice->GetEvent(ievent);
231     TTree *TH = gAlice->TreeH ();
232     if (!TH)
233       return;
234     TParticle*    particle;
235     AliTOFhitT0*  tofHit;
236     TClonesArray* TOFhits = TOF->Hits();
237
238     Int_t lasttrack=-1;
239     Int_t nset=0;
240     // Start loop on primary tracks in the hits containers
241
242     Int_t ntracks = static_cast<Int_t>(TH->GetEntries());
243     for (Int_t track = 0; track < ntracks; track++)
244     {
245       if(nset>=5) break; // check on the number of set analyzed
246       
247       gAlice->ResetHits();
248       TH->GetEvent(track);
249       particle = gAlice->Particle(track);
250       Int_t nhits = TOFhits->GetEntriesFast();
251
252       for (Int_t hit = 0; hit < nhits; hit++)
253       {
254         tofHit = (AliTOFhitT0 *) TOFhits->UncheckedAt(hit);
255         ipart    = tofHit->GetTrack();
256         // check to discard the case when the same particle is selected more than one
257         // time 
258
259         if (ipart != ipartold){
260           
261           particle = (TParticle*)gAlice->Particle(ipart);
262           
263           Float_t idealtime=tofHit->GetTof();
264           //       Float_t time=idealtime;
265           Float_t time   = gRandom->Gaus(idealtime, fTimeResolution);
266           Float_t toflen=tofHit->GetLen();
267           toflen=toflen/100.; // toflen given in m
268           Int_t pdg   = particle->GetPdgCode();
269           Int_t abspdg   =TMath::Abs(pdg);
270           Float_t idealmom  = particle->P();
271           Float_t momres=idealmom*0.025; // 2.5% res token into account for all momenta
272           Float_t mom =gRandom->Gaus(idealmom,momres);
273
274           Bool_t isgoodpart=(abspdg==211 || abspdg==2212 || abspdg==321);
275
276           time*=1.E+9; // tof given in nanoseconds         
277           if (particle->GetFirstMother() < 0 && isgoodpart && mom<=fUpperMomBound && mom>=fLowerMomBound){
278             selected+=1;
279             istop=selected;
280             if(istop>10) break;
281             Int_t index=selected-1;
282             timeofflight[index]=time;
283             tracktoflen[index]=toflen;
284             momentum[index]=mom;
285             //      cout << timeofflight[index] << " " << tracktoflen[index] << " " << momentum[index] << endl;
286             switch (abspdg) {
287             case 211:
288               truparticle[index]=0;
289               break ;
290             case 321:
291               truparticle[index]=1;
292               break ;
293             case 2212: 
294               truparticle[index]=2;
295               break ;
296             }
297             
298           }
299           ipartold = ipart;
300           
301           if(istop==10){ // start analysis on current set
302             nset+=1;
303             lasttrack=track;
304             istop=0;
305             selected=0;
306             //cout << "starting t0 calculation for current set" << endl;
307             for (Int_t i1=0; i1<3;i1++) {
308               for (Int_t i2=0; i2<3;i2++) { 
309                 for (Int_t i3=0; i3<3;i3++) {
310                   for (Int_t i4=0; i4<3;i4++) {
311                     for (Int_t i5=0; i5<3;i5++) {
312                       for (Int_t i6=0; i6<3;i6++) {
313                         for (Int_t i7=0; i7<3;i7++) { 
314                           for (Int_t i8=0; i8<3;i8++) {
315                             for (Int_t i9=0; i9<3;i9++) {
316                               for (Int_t i10=0; i10<3;i10++) {  
317
318                                 beta[0]=momentum[0]/sqrt(massarray[i1]*massarray[i1]+momentum[0]*momentum[0]);
319                                 beta[1]=momentum[1]/sqrt(massarray[i2]*massarray[i2]+momentum[1]*momentum[1]);
320                                 beta[2]=momentum[2]/sqrt(massarray[i3]*massarray[i3]+momentum[2]*momentum[2]);
321                                 beta[3]=momentum[3]/sqrt(massarray[i4]*massarray[i4]+momentum[3]*momentum[3]);
322                                 beta[4]=momentum[4]/sqrt(massarray[i5]*massarray[i5]+momentum[4]*momentum[4]);
323                                 beta[5]=momentum[5]/sqrt(massarray[i6]*massarray[i6]+momentum[5]*momentum[5]);
324                                 beta[6]=momentum[6]/sqrt(massarray[i7]*massarray[i7]+momentum[6]*momentum[6]);
325                                 beta[7]=momentum[7]/sqrt(massarray[i8]*massarray[i8]+momentum[7]*momentum[7]);
326                                 beta[8]=momentum[8]/sqrt(massarray[i9]*massarray[i9]+momentum[8]*momentum[8]);
327                                 beta[9]=momentum[9]/sqrt(massarray[i10]*massarray[i10]+momentum[9]*momentum[9]);
328                                 
329                                 
330                                 Float_t meantzero=0.;
331                                 Float_t sumAllweights=0.;
332                                 for (Int_t itz=0; itz<10;itz++) {
333                                   sqMomError[itz]=((1.-beta[itz]*beta[itz])*0.025)*((1.-beta[itz]*beta[itz])*0.025)*(tracktoflen[itz]/(0.299792*beta[itz]))*(tracktoflen[itz]/(0.299792*beta[itz])); // this gives the square of the momentum error in nanoseconds
334                                   sqTrackError[itz]=(timeresolutioninns*timeresolutioninns+sqMomError[itz]); // total error for the current track
335                                   sumAllweights+=1./sqTrackError[itz];
336                                   // redefining beta, it is useful in order to calculate t zero
337                                   beta[itz]*=0.299792;
338                                   timezero[itz]=(tracktoflen[itz]/beta[itz])-timeofflight[itz];
339                                   weightedtimezero[itz]=((tracktoflen[itz]/beta[itz])-timeofflight[itz])/sqTrackError[itz];// weighted time zero for current track
340                                   meantzero+=weightedtimezero[itz];
341                                 } // end loop for (Int_t itz=0; itz<10;itz++)
342                                 meantzero=meantzero/sumAllweights; // it is given in [ns]
343                                 
344                                 dummychisquare=0.;
345                                 // calculate the chisquare for the current assignment
346                                 for (Int_t icsq=0; icsq<10;icsq++) {
347                                   dummychisquare+=(timezero[icsq]-meantzero)*(timezero[icsq]-meantzero)/sqTrackError[icsq];
348                                 } // end loop for (Int_t icsq=0; icsq<10;icsq++) 
349
350                                 if(dummychisquare<=chisquare){
351                                   assparticle[0]=i1;
352                                   assparticle[1]=i2;
353                                   assparticle[2]=i3;
354                                   assparticle[3]=i4;
355                                   assparticle[4]=i5;
356                                   assparticle[5]=i6;
357                                   assparticle[6]=i7;
358                                   assparticle[7]=i8;
359                                   assparticle[8]=i9;
360                                   assparticle[9]=i10;
361                                   chisquare=dummychisquare;
362                                   t0best=meantzero;
363                                 } // close if(dummychisquare<=chisquare)
364                                 
365                               } // end loop on i10
366                             } // end loop on i9
367                           } // end loop on i8
368                         } // end loop on i7
369                       } // end loop on i6
370                     } // end loop on i5
371                   } // end loop on i4
372                 } // end loop on i3
373               } // end loop on i2
374             } // end loop on i1
375
376             if(truparticle[0]==assparticle[0] && truparticle[1]==assparticle[1] && truparticle[2]==assparticle[2]  && truparticle[3]==assparticle[3] && truparticle[4]==assparticle[4]&& truparticle[5]==assparticle[5] && truparticle[6]==assparticle[6] && truparticle[7]==assparticle[7]  && truparticle[8]==assparticle[8] && truparticle[9]==assparticle[9]) ngood+=1;
377             if(truparticle[0]!=assparticle[0]) nmisidentified0+=1;
378             if(truparticle[1]!=assparticle[1]) nmisidentified1+=1;
379             if(truparticle[2]!=assparticle[2]) nmisidentified2+=1;
380             if(truparticle[3]!=assparticle[3]) nmisidentified3+=1;
381             if(truparticle[4]!=assparticle[4]) nmisidentified4+=1;
382             if(truparticle[5]!=assparticle[5]) nmisidentified5+=1;
383             if(truparticle[6]!=assparticle[6]) nmisidentified6+=1;
384             if(truparticle[7]!=assparticle[7]) nmisidentified7+=1;
385             if(truparticle[8]!=assparticle[8]) nmisidentified8+=1;
386             if(truparticle[9]!=assparticle[9]) nmisidentified9+=1;
387             // filling histos
388             htzerobest->Fill(t0best);
389             hchibest->Fill(chisquare);
390             Double_t dblechisquare=(Double_t)chisquare;
391             Float_t confLevel=(Float_t)TMath::Prob(dblechisquare,9); // ndf 10-1=9
392             hchibestconflevel->Fill(confLevel);
393             itimes++;
394             if(strstr(option,"all")){
395               cout << "True Assignment " << truparticle[0] << truparticle[1] << truparticle[2] << truparticle[3] << truparticle[4] << truparticle[5] << truparticle[6] << truparticle[7] << truparticle[8] << truparticle[9] <<endl;
396               cout << "Best Assignment " << assparticle[0] << assparticle[1] << assparticle[2] << assparticle[3] << assparticle[4] << assparticle[5] << assparticle[6] << assparticle[7] << assparticle[8] << assparticle[9] << endl;
397               cout << "Minimum ChiSquare for current set    " << chisquare << endl;
398               cout << "Confidence Level (Minimum ChiSquare) " << confLevel << endl;
399             }
400             if (strstr(option,"visual") && itimes && (itimes%kUPDATE) == 0) {
401               if (itimes == kUPDATE){
402                 c1->cd();
403                 htzerobest->Draw();
404                 c2->cd();
405                 hchibest->Draw();
406                 c3->cd();
407                 hchibestconflevel->Draw();
408               }
409               c1->Modified();
410               c1->Update();
411               c2->Modified();
412               c2->Update();
413               c3->Modified();
414               c3->Update();
415               if (gSystem->ProcessEvents())
416                 break;
417             }
418             chisquare=999.;
419             t0best=999.;
420             
421           } // end for the current set. close if(istop==5)
422         } // end condition on ipartold
423       } // end loop on hits for the current track
424       if(istop>=10) break;
425     } // end loop on ntracks  
426   } //event loop
427   
428   if(strstr(option,"all")){
429     nmisidentified=(nmisidentified0+nmisidentified1+nmisidentified2+nmisidentified3+nmisidentified4+nmisidentified5+nmisidentified6+nmisidentified7+nmisidentified8+nmisidentified9);
430     cout << "total number of tracks token into account  " << 10*5*fNevents << endl;
431     Float_t badPercentage=100.*(Float_t)nmisidentified/(10*5*fNevents);
432     cout << "total misidentified                        " << nmisidentified << "("<< badPercentage << "%)" <<endl;
433     cout << "Total Number of set token into account     " << 5*fNevents << endl;
434     Float_t goodSetPercentage=100.*(Float_t)ngood/(5*fNevents);
435     cout << "Number of set with no misidentified tracks " << ngood << "("<< goodSetPercentage << "%)" <<endl;
436   }
437
438   // free used memory for canvas
439   delete c1; c1=0;
440   delete c2; c2=0;
441   delete c3; c3=0;
442
443   // generating output filename only if not previously specified using SetTZeroFile
444   char outFileName[70];
445   strcpy(outFileName,"ht010tr120ps"); // global time resolution has to be converted from Int_t to char
446                                       // in order to have in the output filename this parameter
447   strcat(outFileName,fHeadersFile);
448
449   if(fT0File.IsNull()) fT0File=outFileName;
450
451   TFile* houtfile = new TFile(fT0File,"recreate");
452   houtfile->cd();
453   htzerobest->Write(0,TObject::kOverwrite);
454   hchibest->Write(0,TObject::kOverwrite);
455   hchibestconflevel->Write(0,TObject::kOverwrite);
456   houtfile->Close();  
457   
458   
459   if(strstr(option,"tim") || strstr(option,"all")){
460     gBenchmark->Stop("TOFT0");
461     cout << "AliTOFT0:" << endl ;
462     cout << "   took " << gBenchmark->GetCpuTime("TOFT0") << " seconds in order to calculate T0 " 
463          <<  gBenchmark->GetCpuTime("TOFT0")/fNevents << " seconds per event " << endl ;
464     cout << endl ;
465   }
466 }
467  
468 //__________________________________________________________________
469 void AliTOFT0::SetTZeroFile(char * file ){
470   cout << "Destination file : " << file << endl ;
471   fT0File=file;
472 }
473 //__________________________________________________________________
474 void AliTOFT0::Print(Option_t* option)const
475 {
476   cout << "------------------- "<< GetName() << " -------------" << endl ;
477   if(!fT0File.IsNull())
478     cout << "  Writing T0 Distribution to file  " << (char*) fT0File.Data() << endl ;
479 }
480
481 //__________________________________________________________________
482 Bool_t AliTOFT0::operator==( AliTOFT0 const &tzero )const
483 {
484   // Equal operator.
485   // 
486
487   if( (fTimeResolution==tzero.fTimeResolution)&&(fLowerMomBound==tzero.fLowerMomBound)&&(fUpperMomBound==tzero.fUpperMomBound))
488     return kTRUE ;
489   else
490     return kFALSE ;
491 }
492