1 /////////////////////////////////////////////////////////////////////////////////////
3 // AliFemtoEventReaderKinematicsChain - the reader class for the Alice ESD and //
4 // the model Kinematics information tailored for the Task framework and the //
5 // Reads in AliESDfriend to create shared hit/quality information //
6 // Authors: Malgorzata Janik, Warsaw University of Technology, majanik@cern.ch //
7 // Lukasz Graczykowski, Warsaw University of Technology, lgraczyk@cern.ch //
9 /////////////////////////////////////////////////////////////////////////////////////
11 #include "AliFemtoEventReaderKinematicsChain.h"
17 #include "AliFmPhysicalHelixD.h"
18 #include "AliFmThreeVectorF.h"
20 #include "SystemOfUnits.h"
22 #include "AliFemtoEvent.h"
24 #include "TParticle.h"
26 #include "TParticlePDG.h"
27 #include "AliFemtoModelHiddenInfo.h"
28 #include "AliFemtoModelGlobalHiddenInfo.h"
29 #include "AliGenHijingEventHeader.h"
30 #include "AliGenCocktailEventHeader.h"
32 #include "AliVertexerTracks.h"
34 ClassImp(AliFemtoEventReaderKinematicsChain)
36 #if !(ST_NO_NAMESPACES)
37 using namespace units;
41 //____________________________
42 AliFemtoEventReaderKinematicsChain::AliFemtoEventReaderKinematicsChain():
50 fEstEventMult(kGlobalCount),
51 fRotateToEventPlane(0)
53 //constructor with 0 parameters , look at default settings
57 AliFemtoEventReaderKinematicsChain::AliFemtoEventReaderKinematicsChain(const AliFemtoEventReaderKinematicsChain& aReader):
58 AliFemtoEventReader(aReader),
66 fEstEventMult(kGlobalCount),
67 fRotateToEventPlane(0)
70 fConstrained = aReader.fConstrained;
71 fNumberofEvent = aReader.fNumberofEvent;
72 fCurEvent = aReader.fCurEvent;
73 fCurFile = aReader.fCurFile;
74 fStack = aReader.fStack;
75 fEstEventMult = aReader.fEstEventMult;
76 fRotateToEventPlane = aReader.fRotateToEventPlane;
79 AliFemtoEventReaderKinematicsChain::~AliFemtoEventReaderKinematicsChain()
86 AliFemtoEventReaderKinematicsChain& AliFemtoEventReaderKinematicsChain::operator=(const AliFemtoEventReaderKinematicsChain& aReader)
88 // Assignment operator
92 fConstrained = aReader.fConstrained;
93 fNumberofEvent = aReader.fNumberofEvent;
94 fCurEvent = aReader.fCurEvent;
95 fCurFile = aReader.fCurFile;
96 fStack = aReader.fStack;
97 fGenHeader = aReader.fGenHeader;
98 fEstEventMult = aReader.fEstEventMult;
99 fRotateToEventPlane = aReader.fRotateToEventPlane;
104 AliFemtoString AliFemtoEventReaderKinematicsChain::Report()
106 AliFemtoString temp = "\n This is the AliFemtoEventReaderKinematicsChain\n";
111 void AliFemtoEventReaderKinematicsChain::SetConstrained(const bool constrained)
113 // Select whether to read constrained or not constrained momentum
114 fConstrained=constrained;
117 bool AliFemtoEventReaderKinematicsChain::GetConstrained() const
119 // Check whether we read constrained or not constrained momentum
123 AliFemtoEvent* AliFemtoEventReaderKinematicsChain::ReturnHbtEvent()
125 // Get the event, read all the relevant information from the stack
126 // and fill the AliFemtoEvent class
127 // Returns a valid AliFemtoEvent
128 AliFemtoEvent *hbtEvent = 0;
129 string tFriendFileName;
131 cout << "AliFemtoEventReaderKinematlaicsChain::Starting to read event: "<<fCurEvent<<endl;
133 hbtEvent = new AliFemtoEvent;
134 //setting basic things
135 // hbtEvent->SetEventNumber(fEvent->GetEventNumber());
136 hbtEvent->SetRunNumber(0); //No Run number in Kinematics!
137 hbtEvent->SetMagneticField(0*kilogauss);//to check if here is ok
138 hbtEvent->SetZDCN1Energy(0);
139 hbtEvent->SetZDCP1Energy(0);
140 hbtEvent->SetZDCN2Energy(0);
141 hbtEvent->SetZDCP2Energy(0);
142 hbtEvent->SetZDCEMEnergy(0);
143 hbtEvent->SetZDCParticipants(0);
144 hbtEvent->SetTriggerMask(0);
145 hbtEvent->SetTriggerCluster(0);
148 double fV1[3] = {0.0,0.0,0.0};
149 double fVCov[6] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
152 AliFmThreeVectorF vertex(0,0,0);
155 hbtEvent->SetPrimVertPos(vertex);
156 hbtEvent->SetPrimVertCov(fVCov);
158 Double_t tReactionPlane = 0;
160 AliGenHijingEventHeader *hdh = dynamic_cast<AliGenHijingEventHeader *> (fGenHeader);
162 AliGenCocktailEventHeader *cdh = dynamic_cast<AliGenCocktailEventHeader *> (fGenHeader);
164 TList *tGenHeaders = cdh->GetHeaders();
165 for (int ihead = 0; ihead<tGenHeaders->GetEntries(); ihead++) {
166 hdh = dynamic_cast<AliGenHijingEventHeader *> (fGenHeader);
174 tReactionPlane = hdh->ReactionPlaneAngle();
175 cout << "Got reaction plane " << tReactionPlane << endl;
178 hbtEvent->SetReactionPlaneAngle(tReactionPlane);
180 //starting to reading tracks
181 int nofTracks=0; //number of all tracks in MC event
182 nofTracks=fStack->GetNtrack();
183 int realnofTracks=0;//number of track which we use in analysis
187 int tV0direction = 0;
188 for (int i=0;i<nofTracks;i++)
190 //take only primaries
191 if(!fStack->IsPhysicalPrimary(i)) {continue;}
193 AliFemtoTrack* trackCopy = new AliFemtoTrack();
196 TParticle *kinetrack= fStack->Particle(i);
201 //setting multiplicity
202 realnofTracks++;//real number of tracks (only primary particles)
204 //setting normalized multiplicity
206 if(kinetrack->GetPDG()->Charge()/3!=0)
207 if (kinetrack->Pt() > 0.15 && kinetrack->Pt() < 20)
208 if (kinetrack->Eta() < 0.8)
211 //counting particles that go into direction of VZERO detector
212 if(kinetrack->Eta() > 2.8 && kinetrack->Eta() < 5.1) //VZERO-A
214 if(kinetrack->Eta() > -3.7 && kinetrack->Eta() < -1.7)//VZERO-C
218 trackCopy->SetCharge((short)(fStack->Particle(i)->GetPDG()->Charge()/3));
221 //in aliroot we have AliPID
222 //0-electron 1-muon 2-pion 3-kaon 4-proton 5-photon 6-pi0 7-neutron 8-kaon0 9-eleCon
223 //we use only 5 first
225 for(int pid_iter=0;pid_iter<5;pid_iter++)
228 int pdgcode = kinetrack->GetPdgCode();
230 if(pdgcode==2212 || pdgcode==-2212)
233 else if(pdgcode==321 || pdgcode==-321 )
236 else if( pdgcode==211 || pdgcode==-211)
239 else if(pdgcode==11 || pdgcode==-11)
242 else if(pdgcode==13 || pdgcode==-13)
246 trackCopy->SetPidProbElectron(kinepid[0]);
247 trackCopy->SetPidProbMuon(kinepid[1]);
248 trackCopy->SetPidProbPion(kinepid[2]);
249 trackCopy->SetPidProbKaon(kinepid[3]);
250 trackCopy->SetPidProbProton(kinepid[4]);
257 pxyz[0]=kinetrack->Px();
258 pxyz[1]=kinetrack->Py();
259 pxyz[2]=kinetrack->Pz();
261 rxyz[0]=kinetrack->Vx();
262 rxyz[1]=kinetrack->Vy();
263 rxyz[2]=kinetrack->Vz();
265 AliFemtoModelHiddenInfo *tInfo = new AliFemtoModelHiddenInfo();
266 tInfo->SetPDGPid(kinetrack->GetPdgCode());
267 tInfo->SetTrueMomentum(pxyz[0], pxyz[1], pxyz[2]);
268 tInfo->SetMass(kinetrack->GetMass());
269 tInfo->SetEmissionPoint(rxyz[0]-fV1[0], rxyz[1]-fV1[1], rxyz[2]-fV1[2], 0.0);
270 trackCopy->SetHiddenInfo(tInfo);
272 trackCopy->SetTrueMomentum(pxyz[0], pxyz[1], pxyz[2]);
273 trackCopy->SetEmissionPoint(rxyz[0]-fV1[0], rxyz[1]-fV1[1], rxyz[2]-fV1[2], 0.0);
276 if (fRotateToEventPlane) {
277 double tPhi = TMath::ATan2(pxyz[1], pxyz[0]);
278 double tRad = TMath::Hypot(pxyz[0], pxyz[1]);
280 pxyz[0] = tRad*TMath::Cos(tPhi - tReactionPlane);
281 pxyz[1] = tRad*TMath::Sin(tPhi - tReactionPlane);
284 AliFemtoThreeVector v(pxyz[0],pxyz[1],pxyz[2]);
285 if (v.Mag() < 0.0001) {
286 //cout << "Found 0 momentum ???? " << pxyz[0] << " " << pxyz[1] << " " << pxyz[2] << endl;
291 trackCopy->SetP(v);//setting momentum
292 trackCopy->SetPt(sqrt(pxyz[0]*pxyz[0]+pxyz[1]*pxyz[1]));
293 const AliFmThreeVectorD kP(pxyz[0],pxyz[1],pxyz[2]);
294 const AliFmThreeVectorD kOrigin(fV1[0],fV1[1],fV1[2]);
297 trackCopy->SetLabel(i);
300 hbtEvent->TrackCollection()->push_back(trackCopy);//adding track to analysis
301 //cout<<"Track added: "<<i<<endl;
305 hbtEvent->SetNumberOfTracks(realnofTracks);//setting number of track which we read in event
306 if (fEstEventMult == kGlobalCount)
307 hbtEvent->SetNormalizedMult(tNormMult);
308 else if(fEstEventMult == kVZERO)
309 hbtEvent->SetNormalizedMult(tV0direction);
313 //V0 analysis code - no V0 finder for Kinematics, we can only check if it is primary and if it has at least 2 daughters.
315 for (int i=0;i<nofTracks;i++)
317 //do not take primaries
318 if(!fStack->IsPhysicalPrimary(i)) {continue;}
320 TParticle *kinetrack= fStack->Particle(i);
321 if (!kinetrack) continue;
323 if(kinetrack->GetPDG()->Charge()!=0) continue; //charge - neutral
324 //if(kinetrack->GetPDG()->Stable()==1) continue; //particle is not stable
325 if(kinetrack->GetDaughter(0)<1) continue; //has 1'st daughter
326 if(kinetrack->GetDaughter(1)<1) continue; //has 2'nd daughter
328 //we want one positive, one negative particle. Or two neutral.
329 // if((fStack->Particle(kinetrack->GetDaughter(0)))->GetPDG()->Charge()>=0)
330 // if((fStack->Particle(kinetrack->GetDaughter(1)))->GetPDG()->Charge()>0)
332 // if((fStack->Particle(kinetrack->GetDaughter(0)))->GetPDG()->Charge()<=0)
333 // if((fStack->Particle(kinetrack->GetDaughter(0)))->GetPDG()->Charge()<0)
336 if(kinetrack->Pt()<0.00001)
339 AliFemtoV0* trackCopyV0 = new AliFemtoV0();
340 CopyAODtoFemtoV0(kinetrack, trackCopyV0);
341 hbtEvent->V0Collection()->push_back(trackCopyV0);
342 //cout<<"Pushback v0 to v0collection"<<endl;
346 cout<<"Number of tracks: "<<realnofTracks<<endl;
351 //___________________
352 void AliFemtoEventReaderKinematicsChain::SetStackSource(AliStack *aStack)
354 // The chain loads the stack for us
355 // You must provide the address where it can be found
358 //___________________
359 void AliFemtoEventReaderKinematicsChain::SetGenEventHeader(AliGenEventHeader *aGenHeader)
361 // The chain loads the generator event header for us
362 // You must provide the address where it can be found
363 fGenHeader = aGenHeader;
367 void AliFemtoEventReaderKinematicsChain::SetRotateToEventPlane(short dorotate)
369 fRotateToEventPlane=dorotate;
372 void AliFemtoEventReaderKinematicsChain::SetUseMultiplicity(EstEventMult aType)
374 fEstEventMult = aType;
377 Float_t AliFemtoEventReaderKinematicsChain::GetSigmaToVertex(double *impact, double *covar)
379 // Calculates the number of sigma to the vertex.
391 bRes[0] = TMath::Sqrt(bCov[0]);
392 bRes[1] = TMath::Sqrt(bCov[2]);
394 // -----------------------------------
395 // How to get to a n-sigma cut?
397 // The accumulated statistics from 0 to d is
399 // -> Erf(d/Sqrt(2)) for a 1-dim gauss (d = n_sigma)
400 // -> 1 - Exp(-d**2) for a 2-dim gauss (d*d = dx*dx + dy*dy != n_sigma)
402 // It means that for a 2-dim gauss: n_sigma(d) = Sqrt(2)*ErfInv(1 - Exp((-x**2)/2)
403 // Can this be expressed in a different way?
405 if (bRes[0] == 0 || bRes[1] ==0)
408 Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));
410 // stupid rounding problem screws up everything:
411 // if d is too big, TMath::Exp(...) gets 0, and TMath::ErfInverse(1) that should be infinite, gets 0 :(
412 if (TMath::Exp(-d * d / 2) < 1e-10)
415 d = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
421 void AliFemtoEventReaderKinematicsChain::CopyAODtoFemtoV0(TParticle *tv0, AliFemtoV0 *tFemtoV0 )
423 tFemtoV0->SetEtaV0(tv0->Eta());
424 tFemtoV0->SetEtaV0(tv0->Phi());
425 tFemtoV0->SetptV0(tv0->Pt());
426 tFemtoV0->SetptotV0(tv0->P());
428 tFemtoV0->SetmomV0X(tv0->Px());
429 tFemtoV0->SetmomV0Y(tv0->Py());
430 tFemtoV0->SetmomV0Z(tv0->Pz());
431 AliFemtoThreeVector momv0(tv0->Px(),tv0->Py(),tv0->Pz());
432 tFemtoV0->SetmomV0(momv0);
439 if(fStack->Particle(tv0->GetDaughter(0))->GetPDG()->Charge()>=0) //first positive, second negative
441 trackpos = (TParticle*)(fStack->Particle(tv0->GetDaughter(0)));
442 trackneg = (TParticle*)(fStack->Particle(tv0->GetDaughter(1)));
443 tFemtoV0->SetidPos(tv0->GetDaughter(0));
444 tFemtoV0->SetidNeg(tv0->GetDaughter(1));
446 else //first negative, second positive
448 trackpos = (TParticle*)(fStack->Particle(tv0->GetDaughter(1)));
449 trackneg = (TParticle*)(fStack->Particle(tv0->GetDaughter(0)));
450 tFemtoV0->SetidPos(tv0->GetDaughter(1));
451 tFemtoV0->SetidNeg(tv0->GetDaughter(0));
454 tFemtoV0->SetEtaPos(trackpos->Eta());
455 tFemtoV0->SetEtaNeg(trackneg->Eta());
457 tFemtoV0->SetptPos(trackpos->Pt());
458 tFemtoV0->SetptNeg(trackneg->Pt());
460 tFemtoV0->SetptotPos(trackpos->P());
461 tFemtoV0->SetptotNeg(trackneg->P());
463 tFemtoV0->SetmomPosX(trackpos->Px());
464 tFemtoV0->SetmomPosY(trackpos->Py());
465 tFemtoV0->SetmomPosZ(trackpos->Pz());
466 AliFemtoThreeVector mompos(trackpos->Px(),trackpos->Py(),trackpos->Pz());
467 tFemtoV0->SetmomPos(mompos);
469 tFemtoV0->SetmomNegX(trackneg->Px());
470 tFemtoV0->SetmomNegY(trackneg->Py());
471 tFemtoV0->SetmomNegZ(trackneg->Pz());
472 AliFemtoThreeVector momneg(trackneg->Px(),trackneg->Py(),trackneg->Pz());
473 tFemtoV0->SetmomNeg(momneg);
476 tFemtoV0->SetmassLambda(tv0->GetMass());
477 tFemtoV0->SetmassAntiLambda(tv0->GetMass());
478 tFemtoV0->SetmassK0Short(tv0->GetMass());
480 tFemtoV0->SetYV0(tv0->Y());
482 tFemtoV0->SetdecayVertexV0X(trackpos->Vx()); //vertex of the decay is set as the vertex of creation of daughters
483 tFemtoV0->SetdecayVertexV0Y(trackpos->Vy());
484 tFemtoV0->SetdecayVertexV0Z(trackpos->Vz());
485 AliFemtoThreeVector decayvertex(trackpos->Vx(),trackpos->Vy(),trackpos->Vz());
486 tFemtoV0->SetdecayVertexV0(decayvertex);
488 tFemtoV0->SetdcaV0Daughters(0);
489 tFemtoV0->SetCosPointingAngle(1);
492 tFemtoV0->SetStatusPos(1);
493 tFemtoV0->SetStatusNeg(1);
496 if(trackpos->GetPdgCode()==2212) //proton
498 tFemtoV0->SetPosNSigmaTPCK(1000);
499 tFemtoV0->SetPosNSigmaTPCPi(1000);
500 tFemtoV0->SetPosNSigmaTPCP(0);
502 if(trackneg->GetPdgCode()==-2212) //antiproton
504 tFemtoV0->SetNegNSigmaTPCK(1000);
505 tFemtoV0->SetNegNSigmaTPCPi(1000);
506 tFemtoV0->SetNegNSigmaTPCP(0);
508 if(trackpos->GetPdgCode()==211) //pion plus
510 tFemtoV0->SetPosNSigmaTPCK(1000);
511 tFemtoV0->SetPosNSigmaTPCPi(0);
512 tFemtoV0->SetPosNSigmaTPCP(1000);
514 if(trackneg->GetPdgCode()==-211) //pion minus
516 tFemtoV0->SetNegNSigmaTPCK(1000);
517 tFemtoV0->SetNegNSigmaTPCPi(0);
518 tFemtoV0->SetNegNSigmaTPCP(1000);
520 if(trackpos->GetPdgCode()==321) //K+
522 tFemtoV0->SetPosNSigmaTPCK(0);
523 tFemtoV0->SetPosNSigmaTPCPi(1000);
524 tFemtoV0->SetPosNSigmaTPCP(1000);
526 if(trackneg->GetPdgCode()==-321) //K-
528 tFemtoV0->SetNegNSigmaTPCK(0);
529 tFemtoV0->SetNegNSigmaTPCPi(1000);
530 tFemtoV0->SetNegNSigmaTPCP(1000);