1 /**************************************************************************
2 * Copyright(c) 1998-2006, ALICE Experiment at CERN, All rights reserved. *
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 purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 /////////////////////////////////////////////////////////////
20 // Base class for AOD reconstructed light-flavour decays
21 // strongly based on AOD reconstructed heavy-flavour decay by
22 // A.Dainese, andrea.dainese@lnl.infn.it
23 // Author: Ramona Lea (ramona.lea@cern.ch)
24 /////////////////////////////////////////////////////////////
26 #include <TDatabasePDG.h>
29 #include "AliAODRecoDecay.h"
30 #include "AliAODRecoDecayLF.h"
31 #include "AliAODEvent.h"
32 #include "AliVertexerTracks.h"
33 #include "AliExternalTrackParam.h"
34 #include "AliKFVertex.h"
35 #include "AliVVertex.h"
36 #include "AliESDVertex.h"
38 ClassImp(AliAODRecoDecayLF)
40 //--------------------------------------------------------------------------
41 AliAODRecoDecayLF::AliAODRecoDecayLF() :
51 // Default Constructor
54 //--------------------------------------------------------------------------
55 AliAODRecoDecayLF::AliAODRecoDecayLF(AliAODVertex *vtx2,Int_t nprongs,Short_t charge,
56 Double_t *px,Double_t *py,Double_t *pz,
57 Double_t *d0,Double_t *d0err) :
58 AliAODRecoDecay(vtx2,nprongs,charge,px,py,pz,d0),
67 // Constructor with AliAODVertex for decay vertex
69 fd0err = new Double_t[GetNProngs()];
70 for(Int_t i=0; i<GetNProngs(); i++) fd0err[i] = d0err[i];
72 //--------------------------------------------------------------------------
73 AliAODRecoDecayLF::AliAODRecoDecayLF(AliAODVertex *vtx2,Int_t nprongs,Short_t charge,
74 Double_t *d0,Double_t *d0err) :
75 AliAODRecoDecay(vtx2,nprongs,charge,d0),
84 // Constructor with AliAODVertex for decay vertex and without prongs momenta
86 fd0err = new Double_t[GetNProngs()];
87 for(Int_t i=0; i<GetNProngs(); i++) fd0err[i] = d0err[i];
89 //--------------------------------------------------------------------------
90 AliAODRecoDecayLF::AliAODRecoDecayLF(Double_t vtx1[3],Double_t vtx2[3],
91 Int_t nprongs,Short_t charge,
92 Double_t *px,Double_t *py,Double_t *pz,
94 AliAODRecoDecay(0x0,nprongs,charge,px,py,pz,d0),
103 // Constructor that can used for a "MC" object
106 fOwnPrimaryVtx = new AliAODVertex(vtx1);
108 AliAODVertex *vtx = new AliAODVertex(vtx2);
109 SetOwnSecondaryVtx(vtx);
112 //--------------------------------------------------------------------------
113 AliAODRecoDecayLF::AliAODRecoDecayLF(const AliAODRecoDecayLF &source) :
114 AliAODRecoDecay(source),
116 fEventPrimaryVtx(source.fEventPrimaryVtx),
117 fListOfCuts(source.fListOfCuts),
120 fSelectionMap(source.fSelectionMap)
125 if(source.GetOwnPrimaryVtx()) fOwnPrimaryVtx = new AliAODVertex(*(source.GetOwnPrimaryVtx()));
127 if(source.GetNProngs()>0) {
128 fd0err = new Double_t[GetNProngs()];
129 memcpy(fd0err,source.fd0err,GetNProngs()*sizeof(Double_t));
130 if(source.fProngID) {
131 fProngID = new UShort_t[GetNProngs()];
132 memcpy(fProngID,source.fProngID,GetNProngs()*sizeof(UShort_t));
136 //--------------------------------------------------------------------------
137 AliAODRecoDecayLF &AliAODRecoDecayLF::operator=(const AliAODRecoDecayLF &source)
140 // assignment operator
142 if(&source == this) return *this;
144 AliAODRecoDecay::operator=(source);
146 fEventPrimaryVtx = source.fEventPrimaryVtx;
147 fListOfCuts = source.fListOfCuts;
148 fSelectionMap = source.fSelectionMap;
150 if(source.GetOwnPrimaryVtx()) {
151 delete fOwnPrimaryVtx;
152 fOwnPrimaryVtx = new AliAODVertex(*(source.GetOwnPrimaryVtx()));
155 if(source.GetNProngs()>0) {
158 fd0err = new Double_t[GetNProngs()];
159 memcpy(fd0err,source.fd0err,GetNProngs()*sizeof(Double_t));
161 if(source.fProngID) {
163 fProngID = new UShort_t[GetNProngs()];
164 memcpy(fProngID,source.fProngID,GetNProngs()*sizeof(UShort_t));
169 //--------------------------------------------------------------------------
170 AliAODRecoDecayLF::~AliAODRecoDecayLF() {
172 // Default Destructor
174 if(fOwnPrimaryVtx) delete fOwnPrimaryVtx;
175 if(fd0err) delete [] fd0err;
176 if(fProngID) delete [] fProngID;
178 //---------------------------------------------------------------------------
179 AliKFParticle *AliAODRecoDecayLF::ApplyVertexingKF(Int_t *iprongs,Int_t nprongs,Int_t *pdgs,Bool_t topoCostraint, Double_t bzkG, Double_t *mass) const {
181 // Applies the KF vertexer
182 // Int_t iprongs[nprongs] = indices of the prongs to be used from the vertexer
183 // Int_t pdgs[nprongs] = pdgs assigned to the prongs, needed to define the AliKFParticle
184 // Bool_t topoCostraint = if kTRUE, the topological constraint is applied
185 // Double_t bzkG = magnetic field
186 // Double_t mass[2] = {mass, sigma} for the mass constraint (if mass[0]>0 the constraint is applied).
189 AliKFParticle::SetField(bzkG);
190 AliKFParticle *vertexKF=0;
193 Int_t nt=0,ntcheck=0;
195 Double_t pos[3]={0.,0.,0.};
196 if(!fOwnPrimaryVtx) {
197 printf("AliAODRecoDecayLF::ApplyVertexingKF(): cannot apply because primary vertex is not found\n");
200 fOwnPrimaryVtx->GetXYZ(pos);
201 Int_t contr=fOwnPrimaryVtx->GetNContributors();
202 Double_t covmatrix[6]={0.,0.,0.,0.,0.,0.};
203 fOwnPrimaryVtx->GetCovarianceMatrix(covmatrix);
204 Double_t chi2=fOwnPrimaryVtx->GetChi2();
205 AliESDVertex primaryVtx2(pos,covmatrix,chi2,contr,"Vertex");
209 copyKF=AliKFVertex(primaryVtx2);
210 nt=primaryVtx2.GetNContributors();
214 vertexKF = new AliKFParticle();
215 for(Int_t i= 0;i<nprongs;i++){
216 Int_t ipr=iprongs[i];
217 AliAODTrack *aodTrack = (AliAODTrack*)GetDaughter(ipr);
219 printf("AliAODRecoDecayLF::ApplyVertexingKF(): no daughters available\n");
220 delete vertexKF; vertexKF=NULL;
223 AliKFParticle daughterKF(*aodTrack,pdgs[i]);
224 vertexKF->AddDaughter(daughterKF);
226 if(topoCostraint && nt>0){
227 //Int_t index=(Int_t)GetProngID(ipr);
228 if(!aodTrack->GetUsedForPrimVtxFit()) continue;
229 copyKF -= daughterKF;
236 copyKF += (*vertexKF);
237 vertexKF->SetProductionVertex(copyKF);
242 vertexKF->SetMassConstraint(mass[0],mass[1]);
247 //---------------------------------------------------------------------------
248 AliAODVertex* AliAODRecoDecayLF::RemoveDaughtersFromPrimaryVtx(AliAODEvent *aod) {
250 // This method returns a primary vertex without the daughter tracks of the
251 // candidate and it recalculates the impact parameters and errors.
253 // The output vertex is created with "new". The user has to
254 // set it to the candidate with SetOwnPrimaryVtx(), unset it at the end
255 // of processing with UnsetOwnPrimaryVtx() and delete it.
256 // If a NULL pointer is returned, the removal failed (too few tracks left).
258 // For the moment, the primary vertex is recalculated from scratch without
259 // the daughter tracks.
262 AliAODVertex *vtxAOD = aod->GetPrimaryVertex();
263 if(!vtxAOD) return 0;
264 TString title=vtxAOD->GetTitle();
265 if(!title.Contains("VertexerTracks")) return 0;
269 AliVertexerTracks *vertexer = new AliVertexerTracks(aod->GetMagneticField());
271 Int_t ndg = GetNDaughters();
273 vertexer->SetITSMode();
274 vertexer->SetMinClusters(3);
275 vertexer->SetConstraintOff();
277 if(title.Contains("WithConstraint")) {
278 Float_t diamondcovxy[3];
279 aod->GetDiamondCovXY(diamondcovxy);
280 Double_t pos[3]={aod->GetDiamondX(),aod->GetDiamondY(),0.};
281 Double_t cov[6]={diamondcovxy[0],diamondcovxy[1],diamondcovxy[2],0.,0.,10.*10.};
282 AliESDVertex *diamond = new AliESDVertex(pos,cov,1.,1);
283 vertexer->SetVtxStart(diamond);
284 delete diamond; diamond=NULL;
287 Int_t skipped[10]; for(Int_t i=0;i<10;i++) skipped[i]=-1;
288 Int_t nTrksToSkip=0,id;
290 for(Int_t i=0; i<ndg; i++) {
291 t = (AliAODTrack*)GetDaughter(i);
292 id = (Int_t)t->GetID();
294 skipped[nTrksToSkip++] = id;
297 vertexer->SetSkipTracks(nTrksToSkip,skipped);
298 AliESDVertex *vtxESDNew = vertexer->FindPrimaryVertex(aod);
300 delete vertexer; vertexer=NULL;
302 if(!vtxESDNew) return 0;
303 if(vtxESDNew->GetNContributors()<=0) {
304 delete vtxESDNew; vtxESDNew=NULL;
308 // convert to AliAODVertex
309 Double_t pos[3],cov[6],chi2perNDF;
310 vtxESDNew->GetXYZ(pos); // position
311 vtxESDNew->GetCovMatrix(cov); //covariance matrix
312 chi2perNDF = vtxESDNew->GetChi2toNDF();
313 delete vtxESDNew; vtxESDNew=NULL;
315 AliAODVertex *vtxAODNew = new AliAODVertex(pos,cov,chi2perNDF);
317 RecalculateImpPars(vtxAODNew,aod);
321 //-----------------------------------------------------------------------------------
322 void AliAODRecoDecayLF::RecalculateImpPars(AliAODVertex *vtxAODNew,AliAODEvent* aod) {
324 // now recalculate the daughters impact parameters
326 Double_t dz[2],covdz[3];
327 for(Int_t i=0; i<GetNDaughters(); i++) {
328 AliAODTrack *t = (AliAODTrack*)GetDaughter(i);
329 AliExternalTrackParam etp; etp.CopyFromVTrack(t);
330 if(etp.PropagateToDCA(vtxAODNew,aod->GetMagneticField(),3.,dz,covdz)) {
332 fd0err[i] = TMath::Sqrt(covdz[0]);
338 //-----------------------------------------------------------------------------------
339 void AliAODRecoDecayLF::Misalign(TString misal) {
341 // Method to smear the impact parameter of the duaghter tracks
342 // and the sec. vtx position accordinlgy
343 // Useful to study effect of misalignment.
344 // The starting point are parameterisations of the impact parameter resolution
346 // Errors on d0 and vtx are not recalculated (to be done)
348 if(misal=="null")return;
349 Double_t pard0rphiMC[3]={36.7,36.,1.25};// d0(pt)=[0]+[1]/(pt^[2]); in micron, conversion to cm is done later
350 Double_t pard0rphimisal[3]={0,0,0};
351 Double_t pard0zMC[3]={85.,130.,0.7};// d0(pt)=[0]+[1]/(pt^[2]); in micron, conversion to cm is done later
352 Double_t pard0zmisal[3]={0,0,0};
354 //use this to reproduce data d0(pt) trend for pions
355 pard0rphimisal[0]=37.;
356 pard0rphimisal[1]=37.5;
357 pard0rphimisal[2]=1.25;
362 else if(misal=="resB") {
363 // temporary values: asymptotic value larger by a factor 1.2 w.r.t. MC
364 pard0rphimisal[0]=44.4;
365 pard0rphimisal[1]=37.5;
366 pard0rphimisal[2]=1.25;
367 pard0zmisal[0]=115.2;
371 else if(misal=="resC") {
372 // temporary values: slightly larger asymptotic value, larger values at low pt
373 pard0rphimisal[0]=40.;
374 pard0rphimisal[1]=40.;
375 pard0rphimisal[2]=1.3;
380 else printf("AliAODRecoDecayLF::Misalign(): wrong misalign type specified \n");
383 AliAODVertex *evVtx=0x0,*secVtx=0x0;
384 Double_t evVtxPos[3]={-9999.,-9999.,-9999.},secVtxPos[3]={-9999.,9999.,9999.};
385 if(fOwnPrimaryVtx)fOwnPrimaryVtx->GetXYZ(evVtxPos);
387 evVtx=(AliAODVertex*)(fEventPrimaryVtx.GetObject());
388 evVtx->GetXYZ(evVtxPos);
390 secVtx=(AliAODVertex*)GetSecondaryVtx();
391 secVtx->GetXYZ(secVtxPos);
393 TVector3 v2v1(secVtxPos[0]-evVtxPos[0],secVtxPos[1]-evVtxPos[1],0.);
395 Double_t sigmarphinull,sigmarphimisal,sigmarphiadd;
396 Double_t sigmaznull,sigmazmisal,sigmazadd;
397 Double_t deltad0rphi[10],deltad0z[10];
399 // loop on the two prongs
400 for(Int_t i=0; i<fNProngs; i++) {
401 sigmarphinull = pard0rphiMC[0]+pard0rphiMC[1]/TMath::Power(PtProng(i),pard0rphiMC[2]);
402 sigmarphimisal = pard0rphimisal[0]+pard0rphimisal[1]/TMath::Power(PtProng(i),pard0rphimisal[2]);
403 if(sigmarphimisal>sigmarphinull) {
404 sigmarphiadd = TMath::Sqrt(sigmarphimisal*sigmarphimisal-
405 sigmarphinull*sigmarphinull);
406 deltad0rphi[i] = gRandom->Gaus(0.,sigmarphiadd);
411 sigmaznull = pard0zMC[0]+pard0zMC[1]/TMath::Power(PtProng(i),pard0zMC[2]);
412 sigmazmisal = pard0zmisal[0]+pard0zmisal[1]/TMath::Power(PtProng(i),pard0zmisal[2]);
413 if(sigmazmisal>sigmaznull) {
414 sigmazadd = TMath::Sqrt(sigmazmisal*sigmazmisal-
415 sigmaznull*sigmaznull);
416 deltad0z[i] = gRandom->Gaus(0.,sigmazadd);
421 TVector3 pxy(fPx[i],fPy[i],0.);
422 TVector3 pxycrossv2v1=pxy.Cross(v2v1);
423 if( pxycrossv2v1.Z()*fd0[i] > 0 ) {
424 secVtxPos[0]+=1.e-4*deltad0rphi[i]*(-fPy[i])/PtProng(i);// e-4: conversion to cm
425 secVtxPos[1]+=1.e-4*deltad0rphi[i]*(+fPx[i])/PtProng(i);
427 secVtxPos[0]+=1.e-4*deltad0rphi[i]*(+fPy[i])/PtProng(i);
428 secVtxPos[1]+=1.e-4*deltad0rphi[i]*(-fPx[i])/PtProng(i);
432 fd0[i] += 1.e-4*deltad0rphi[i]; // e-4: conversion to cm
433 // change secondary vertex z
434 secVtxPos[2]+=0.5e-4*deltad0z[i];
436 secVtx->SetX(secVtxPos[0]);
437 secVtx->SetY(secVtxPos[1]);
438 secVtx->SetZ(secVtxPos[2]);