1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * SigmaEffect_thetadegrees *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 purpeateose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 //-----------------------------------------------------------------------------
19 // Compact information for the muon generated tracks in the MUON arm
20 // useful at the last stage of the analysis chain
21 // provides a link between the reconstructed track and the generated particle
22 // stores kinematical information at gen. and rec. level and
23 // the decay history of the muon, allowing the identification of the
26 // To be used together with AliMUONPairLight
28 // This class was prepared by INFN Cagliari, July 2006
29 // (authors: H.Woehri, A.de Falco)
30 //-----------------------------------------------------------------------------
33 // Added a temporary fix to FindRefTrack to be able to handle reconstructed tracks
34 // generated from ESD muon track information. The problem is that the ESD data at
35 // the moment only contains the first hit on chamber 1. Hopefully in the near future
36 // this will be fixed and all hit information will be available.
37 // - Artur Szostak <artursz@iafrica.com>
39 #include "AliMUONTrackLight.h"
40 #include "AliMUONTrack.h"
41 #include "AliMUONConstants.h"
42 #include "AliMUONVTrackStore.h"
43 #include "AliMUONTrackExtrap.h"
44 #include "AliMUONTrackParam.h"
46 #include "AliESDMuonTrack.h"
47 #include "AliRunLoader.h"
49 #include "AliHeader.h"
51 #include "TDatabasePDG.h"
52 #include "TParticle.h"
55 ClassImp(AliMUONTrackLight)
57 //===================================================================
59 AliMUONTrackLight::AliMUONTrackLight()
67 fTrackPythiaLine(-999),
73 /// default constructor
74 fPgen.SetPxPyPzE(0.,0.,0.,0.);
75 fPrec.SetPxPyPzE(0.,0.,0.,0.);
76 for (Int_t i=0; i<3; i++) fXYZ[i]=-999;
77 for (Int_t npar = 0; npar < fgkNParentsMax; npar++){
78 fParentPDGCode[npar] = -1;
79 fParentPythiaLine[npar] = -1;
81 for (Int_t i = 0; i < 4; i++){
82 fQuarkPDGCode[i] = -1;
83 fQuarkPythiaLine[i] = -1;
87 //============================================
88 AliMUONTrackLight::AliMUONTrackLight(const AliMUONTrackLight &muonCopy)
90 fPrec(muonCopy.fPrec),
91 fIsTriggered(muonCopy.fIsTriggered),
92 fCharge(muonCopy.fCharge),
93 fChi2(muonCopy.fChi2),
94 fCentr(muonCopy.fCentr),
95 fPgen(muonCopy.fPgen),
96 fTrackPythiaLine(muonCopy.fTrackPythiaLine),
97 fTrackPDGCode(muonCopy.fTrackPDGCode),
98 fOscillation(muonCopy.fOscillation),
99 fNParents(muonCopy.fNParents),
100 fWeight(muonCopy.fWeight)
103 for (Int_t i=0; i<3; i++) fXYZ[i]=muonCopy.fXYZ[i];
104 for (Int_t npar = 0; npar < fgkNParentsMax; npar++){
105 fParentPDGCode[npar] = muonCopy.fParentPDGCode[npar];
106 fParentPythiaLine[npar] = muonCopy.fParentPythiaLine[npar];
108 for (Int_t i = 0; i < 4; i++){
109 fQuarkPDGCode[i] = muonCopy.fQuarkPDGCode[i];
110 fQuarkPythiaLine[i] = muonCopy.fQuarkPythiaLine[i];
114 //============================================
115 AliMUONTrackLight::AliMUONTrackLight(AliESDMuonTrack* muonTrack)
118 fIsTriggered(kFALSE),
123 fTrackPythiaLine(-999),
125 fOscillation(kFALSE),
130 //AliMUONTrackLight();
131 FillFromESD(muonTrack);
134 //============================================
135 AliMUONTrackLight::~AliMUONTrackLight()
140 //============================================
142 void AliMUONTrackLight::FillFromAliMUONTrack(AliMUONTrack *trackReco,Double_t zvert){
143 /// this method sets the muon reconstructed momentum according to the value given by AliMUONTrack
144 AliMUONTrackParam trPar;
145 if (trackReco->GetTrackParamAtVertex()) trPar = *(trackReco->GetTrackParamAtVertex());
147 trPar = *((AliMUONTrackParam*) trackReco->GetTrackParamAtCluster()->First());
148 AliMUONTrackExtrap::ExtrapToVertex(&trPar,0.,0.,0.,0.,0.);
150 this->SetCharge(Int_t(TMath::Sign(1.,trPar.GetInverseBendingMomentum())));
151 this->SetPxPyPz(trPar.Px(),trPar.Py(), trPar.Pz());
152 this->SetTriggered(trackReco->GetMatchTrigger());
154 Double_t xyz[3] = { trPar.GetNonBendingCoor(),
155 trPar.GetBendingCoor(),
157 if (zvert!=-9999) xyz[2] = zvert;
158 this->SetVertex(xyz);
161 //============================================
162 void AliMUONTrackLight::FillFromESD(AliESDMuonTrack* muonTrack,Double_t zvert){
163 /// computes prec and charge from ESD track
164 Double_t mumass = TDatabasePDG::Instance()->GetParticle(13)->Mass();
165 Double_t thetaX = muonTrack->GetThetaX();
166 Double_t thetaY = muonTrack->GetThetaY();
167 Double_t tanthx = TMath::Tan(thetaX);
168 Double_t tanthy = TMath::Tan(thetaY);
169 Double_t pYZ = 1./TMath::Abs(muonTrack->GetInverseBendingMomentum());
170 Double_t pz = - pYZ / TMath::Sqrt(1.0 + tanthy * tanthy);
171 Double_t px = pz * tanthx;
172 Double_t py = pz * tanthy;
173 fCharge = Int_t(TMath::Sign(1.,muonTrack->GetInverseBendingMomentum()));
174 Double_t energy = TMath::Sqrt(mumass * mumass + px*px + py*py + pz*pz);
175 fPrec.SetPxPyPzE(px,py,pz,energy);
177 fXYZ[0] = muonTrack->GetNonBendingCoor();
178 fXYZ[1] = muonTrack->GetBendingCoor();
179 if (zvert==-9999) fXYZ[2] = muonTrack->GetZ();
180 else fXYZ[2] = zvert;
181 // get the chi2 per d.o.f.
182 fChi2 = muonTrack->GetChi2()/ (2.0 * muonTrack->GetNHit() - 5);
183 fIsTriggered = muonTrack->GetMatchTrigger();
186 //============================================
187 void AliMUONTrackLight::SetPxPyPz(Double_t px, Double_t py, Double_t pz){
188 /// set the reconstructed 4-momentum, assuming the particle is a muon
189 Double_t mumass = TDatabasePDG::Instance()->GetParticle(13)->Mass();
190 Double_t energy = TMath::Sqrt(mumass * mumass + px*px + py*py + pz*pz);
191 fPrec.SetPxPyPzE(px,py,pz,energy);
194 //============================================
195 TParticle* AliMUONTrackLight::FindRefTrack(
196 AliMUONTrack* trackReco, AliMUONVTrackStore* trackRefArray,
199 /// Find the Monte Carlo (MC) particle that corresponds to a given reconstructed track.
200 /// @param trackReco This is the reconstructed track for which we want to find a
201 /// corresponding MC particle.
202 /// @param trackRefArray The list of MC reference tracks as generated by
203 /// AliMUONRecoCheck::ReconstructedTracks for example.
204 /// @param stack The MC stack of simulated particles.
207 const Double_t kSigmaCut = 4; // 4 sigmas cut
211 TIter next(trackRefArray->CreateIterator());
212 AliMUONTrack* trackRef;
213 while ( (trackRef = static_cast<AliMUONTrack*>(next())) ) {
214 // check if trackRef is compatible with trackReco:
217 if (trackReco->GetNClusters() > 1) {
219 // check cluster by cluster if trackReco contain info at each cluster
220 Bool_t compTrackArray[10];
221 trackRef->CompatibleTrack(trackReco,kSigmaCut,compTrackArray);
222 if (TrackCheck(compTrackArray) == 4) compTrack = kTRUE;
226 // otherwise check only parameters at the z position of the first trackRef
227 AliMUONTrackParam *refParam = (AliMUONTrackParam*) trackRef->GetTrackParamAtCluster()->First();
228 AliMUONTrackParam recoParam(*((AliMUONTrackParam*) trackReco->GetTrackParamAtCluster()->First()));
229 AliMUONTrackExtrap::ExtrapToZCov(&recoParam, refParam->GetZ());
231 if (refParam->CompatibleTrackParam(recoParam, kSigmaCut, chi2)) compTrack = kTRUE;
237 Int_t trackID = trackRef->GetUniqueID();
238 this->SetTrackPythiaLine(trackID);
239 part = stack->Particle(trackID);
240 fTrackPDGCode = part->GetPdgCode();
244 AliFatal("More than one particle compatible with the reconstructed track.");
249 //============================================
250 Int_t AliMUONTrackLight::TrackCheck(Bool_t *compTrack){
251 /// Apply reconstruction requirements
252 /// Return number of validated conditions
253 /// If all the tests are verified then TrackCheck = 4 (good track)
256 Int_t hitsInLastStations = 0;
258 // apply reconstruction requirements
259 if (compTrack[0] || compTrack[1]) iTrack++; // at least one hit in st. 0
260 if (compTrack[2] || compTrack[3]) iTrack++; // at least one hit in st. 1
261 if (compTrack[4] || compTrack[5]) iTrack++; // at least one hit in st. 2
262 for (Int_t ch = 6; ch < AliMUONConstants::NTrackingCh(); ch++) {
263 if (compTrack[ch]) hitsInLastStations++;
265 if (hitsInLastStations > 2) iTrack++; // at least 3 hits in st. 3 & 4
269 //============================================
270 void AliMUONTrackLight::FillMuonHistory(AliStack *stack, TParticle *part){
271 /// scans the muon history to determine parents pdg code and pythia line
273 Int_t parents[10], parLine[10];
274 Int_t lineM = part->GetFirstMother();//line in the Pythia output of the particle's mother
277 Int_t status=-1, pdg=-1;
280 mother = stack->Particle(lineM); //direct mother of rec. track
281 pdg = mother->GetPdgCode();//store PDG code of first mother
282 // break if a string, gluon, quark or diquark is found
283 if(pdg == 92 || pdg == 21 || TMath::Abs(pdg) < 10 || IsDiquark(pdg)) break;
284 parents[++countP] = pdg;
285 parLine[countP] = lineM;
286 status = mother->GetStatusCode();//get its status code to check if oscillation occured
287 if(IsB0(parents[countP]) && status == 12) this->SetOscillation(kTRUE);
288 lineM = mother->GetFirstMother();
290 //store all the fragmented parents in an array:
291 for(int i = 0; i <= countP; i++){
292 this->SetParentPDGCode(i,parents[countP-i]);
293 this->SetParentPythiaLine(i,parLine[countP-i]);
295 fNParents = countP+1;
298 //and store the lines of the string and further quarks in another array:
300 mother = stack->Particle(lineM);
301 pdg = mother->GetPdgCode();
302 //now, get information before the fragmentation
303 this->SetQuarkPythiaLine(++countP, lineM);//store the line of the string in index 0
304 this->SetQuarkPDGCode(countP, pdg);//store the pdg of the quarks in index 1,2
305 lineM = mother->GetFirstMother();
308 //check if in case of HF production, the string points to the correct end
309 //and correct it in case of need:
311 for(int par = 0; par < 4; par++){
312 if(TMath::Abs(this->GetQuarkPDGCode(par)) < 6){
313 countP = par; //get the quark just before hadronisation
317 if(this->GetQuarkPythiaLine(countP) > -1 && (this->GetParentFlavour(0)==4 || this->GetParentFlavour(0)==5)){
318 if(this->GetParentFlavour(0) != TMath::Abs(this->GetQuarkPDGCode(countP))){
320 AliWarning(Form("quark flavour of parent and that of quark do not correspond: %d %d --> correcting\n",
321 this->GetParentFlavour(0), TMath::Abs(this->GetQuarkPDGCode(countP)))
324 pdg = this->GetQuarkPDGCode(countP);
325 Int_t line = this->GetQuarkPythiaLine(countP);
326 this->ResetQuarkInfo();
327 while(TMath::Abs(pdg) != this->GetParentFlavour(0)){//pdg of q,g in Pythia listing following the wrong string end
328 //must coincide with the flavour of the last fragmented mother
330 pdg = stack->Particle(++line)->GetPdgCode();
332 //now, we have the correct string end and the correct line
333 //continue to fill again all parents and corresponding lines
335 mother = stack->Particle(line);//get again the mother
336 pdg = mother->GetPdgCode();
337 this->SetQuarkPythiaLine(countP, line);
338 this->SetQuarkPDGCode(countP++, pdg);
339 line = mother->GetFirstMother();
341 this->PrintInfo("h");
346 //====================================
347 void AliMUONTrackLight::ResetQuarkInfo(){
348 /// resets parton information
349 for(int pos = 1; pos < 4; pos++){//[0] is the string
350 this->SetQuarkPDGCode(pos,-1);
351 this->SetQuarkPythiaLine(pos,-1);
355 //====================================
356 Bool_t AliMUONTrackLight::IsB0(Int_t intTest) const {
357 /// checks if the particle is a B0
358 Int_t bMes0[2] = {511,531};//flavour code of B0d and B0s
359 Bool_t answer = kFALSE;
360 for(int i = 0; i < 2; i++){
361 if(TMath::Abs(intTest) == bMes0[i]){
368 //====================================
369 Bool_t AliMUONTrackLight::IsMotherAResonance(Int_t index) const {
370 /// checks if mother is a resonance
371 Int_t intTest = GetParentPDGCode(index);
372 // the resonance pdg code is built this way
373 // x00ffn where x=0,1,.. (1S,2S... states), f=quark flavour
374 Int_t id=intTest%100000;
375 return (!((id-id%10)%110));
377 //====================================
378 Int_t AliMUONTrackLight::GetParentFlavour(Int_t idParent) const {
379 /// returns the flavour of parent idParent (idParent=0 is the oldest
380 /// hadronized parent)
381 Int_t pdg = GetParentPDGCode(idParent);
382 Int_t quark = TMath::Abs(pdg/100);
383 if(quark > 9) quark = quark/10;
387 //====================================
388 void AliMUONTrackLight::PrintInfo(Option_t* opt){
389 /// prints information about the track:
390 /// - "H" muon's decay history
391 /// - "K" muon kinematics
392 /// - "A" all variables
393 TString options(opt);
396 if(options.Contains("H") || options.Contains("A")){ //muon decay history
397 char *name= new char[100];
398 TString pdg = "", line = "";
399 for(int i = 3; i >= 0; i--){
400 if(this->GetQuarkPythiaLine(i)>= 0){
401 sprintf(name, "%4d --> ", this->GetQuarkPythiaLine(i));
403 sprintf(name, "%4d --> ", this->GetQuarkPDGCode(i));
407 for(int i = 0; i < fNParents; i++){
408 if(this->GetParentPythiaLine(i)>= 0){
409 sprintf(name, "%7d --> ", this->GetParentPythiaLine(i));
411 sprintf(name, "%7d --> ", this->GetParentPDGCode(i));
415 sprintf(name, "%4d", this->GetTrackPythiaLine()); line += name;
416 sprintf(name, "%4d", this->GetTrackPDGCode()); pdg += name;
418 printf("\nmuon's decay history:\n");
419 printf(" PDG: %s\n", pdg.Data());
420 printf("line: %s\n", line.Data());
422 if(options.Contains("K") || options.Contains("A")){ //muon kinematic
424 Int_t charge = this->GetCharge();
425 Double_t *vtx = this->GetVertex();
426 TLorentzVector momRec = this->GetPRec();
427 TLorentzVector momGen = this->GetPGen();
428 printf("the track's charge is %d\n", charge);
429 printf("Primary vertex: Vx = %1.3f, Vy = %1.3f, Vz = %1.3f\n", vtx[0], vtx[1], vtx[2]);
430 printf("Generated: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momGen.Px(), momGen.Py(), momGen.Pz());
431 printf("Reconstructed: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momRec.Px(), momRec.Py(), momRec.Pz());
432 printf("Rec. variables: pT %1.3f, pseudo-rapidity %1.3f, theta %1.3f (%1.3f degree), phi %1.3f (%1.3f degree)\n",
433 momRec.Pt(), momRec.Eta(), momRec.Theta(), 180./TMath::Pi() * momRec.Theta(),
434 momRec.Phi(), 180./TMath::Pi() * momRec.Phi());
437 //====================================
438 Bool_t AliMUONTrackLight::IsParentPionOrKaon(Int_t idparent){
439 /// checks if a muon comes from a pion or kaon or a particle that decays into one of these two
440 Int_t pdg = this->GetParentPDGCode(idparent);
441 if (TMath::Abs(pdg)==211 || //pi+
442 TMath::Abs(pdg)==321 || //K+
443 TMath::Abs(pdg)==213 || //rho+
444 TMath::Abs(pdg)==311 || //K0
445 TMath::Abs(pdg)==313 || //K*0
446 TMath::Abs(pdg)==323 //K*+
452 //====================================
453 Bool_t AliMUONTrackLight::IsDiquark(Int_t pdg){
454 /// check if the provided pdg code corresponds to a diquark
455 pdg = TMath::Abs(pdg);
456 if((pdg > 1000) && (pdg%100 < 10)) return kTRUE;