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 heavy-flavour decay
22 // Author: A.Dainese, andrea.dainese@lnl.infn.it
23 /////////////////////////////////////////////////////////////
25 #include <TDatabasePDG.h>
28 #include "AliAODRecoDecay.h"
29 #include "AliAODRecoDecayHF.h"
30 #include "AliAODEvent.h"
31 #include "AliVertexerTracks.h"
32 #include "AliExternalTrackParam.h"
33 #include "AliKFVertex.h"
34 #include "AliVVertex.h"
35 #include "AliESDVertex.h"
37 ClassImp(AliAODRecoDecayHF)
39 //--------------------------------------------------------------------------
40 AliAODRecoDecayHF::AliAODRecoDecayHF() :
50 // Default Constructor
53 //--------------------------------------------------------------------------
54 AliAODRecoDecayHF::AliAODRecoDecayHF(AliAODVertex *vtx2,Int_t nprongs,Short_t charge,
55 Double_t *px,Double_t *py,Double_t *pz,
56 Double_t *d0,Double_t *d0err) :
57 AliAODRecoDecay(vtx2,nprongs,charge,px,py,pz,d0),
66 // Constructor with AliAODVertex for decay vertex
68 fd0err = new Double_t[GetNProngs()];
69 for(Int_t i=0; i<GetNProngs(); i++) fd0err[i] = d0err[i];
71 //--------------------------------------------------------------------------
72 AliAODRecoDecayHF::AliAODRecoDecayHF(AliAODVertex *vtx2,Int_t nprongs,Short_t charge,
73 Double_t *d0,Double_t *d0err) :
74 AliAODRecoDecay(vtx2,nprongs,charge,d0),
83 // Constructor with AliAODVertex for decay vertex and without prongs momenta
85 fd0err = new Double_t[GetNProngs()];
86 for(Int_t i=0; i<GetNProngs(); i++) fd0err[i] = d0err[i];
88 //--------------------------------------------------------------------------
89 AliAODRecoDecayHF::AliAODRecoDecayHF(Double_t vtx1[3],Double_t vtx2[3],
90 Int_t nprongs,Short_t charge,
91 Double_t *px,Double_t *py,Double_t *pz,
93 AliAODRecoDecay(0x0,nprongs,charge,px,py,pz,d0),
102 // Constructor that can used for a "MC" object
105 fOwnPrimaryVtx = new AliAODVertex(vtx1);
107 AliAODVertex *vtx = new AliAODVertex(vtx2);
108 SetOwnSecondaryVtx(vtx);
111 //--------------------------------------------------------------------------
112 AliAODRecoDecayHF::AliAODRecoDecayHF(const AliAODRecoDecayHF &source) :
113 AliAODRecoDecay(source),
115 fEventPrimaryVtx(source.fEventPrimaryVtx),
116 fListOfCuts(source.fListOfCuts),
119 fSelectionMap(source.fSelectionMap)
124 if(source.GetOwnPrimaryVtx()) fOwnPrimaryVtx = new AliAODVertex(*(source.GetOwnPrimaryVtx()));
126 if(source.GetNProngs()>0) {
127 fd0err = new Double_t[GetNProngs()];
128 memcpy(fd0err,source.fd0err,GetNProngs()*sizeof(Double_t));
129 if(source.fProngID) {
130 fProngID = new UShort_t[GetNProngs()];
131 memcpy(fProngID,source.fProngID,GetNProngs()*sizeof(UShort_t));
135 //--------------------------------------------------------------------------
136 AliAODRecoDecayHF &AliAODRecoDecayHF::operator=(const AliAODRecoDecayHF &source)
139 // assignment operator
141 if(&source == this) return *this;
143 AliAODRecoDecay::operator=(source);
145 fEventPrimaryVtx = source.fEventPrimaryVtx;
146 fListOfCuts = source.fListOfCuts;
147 fSelectionMap = source.fSelectionMap;
149 if(source.GetOwnPrimaryVtx()) fOwnPrimaryVtx = new AliAODVertex(*(source.GetOwnPrimaryVtx()));
151 if(source.GetNProngs()>0) {
152 fd0err = new Double_t[GetNProngs()];
153 memcpy(fd0err,source.fd0err,GetNProngs()*sizeof(Double_t));
154 if(source.fProngID) {
155 fProngID = new UShort_t[GetNProngs()];
156 memcpy(fProngID,source.fProngID,GetNProngs()*sizeof(UShort_t));
161 //--------------------------------------------------------------------------
162 AliAODRecoDecayHF::~AliAODRecoDecayHF() {
164 // Default Destructor
166 if(fOwnPrimaryVtx) delete fOwnPrimaryVtx;
167 if(fd0err) delete [] fd0err;
168 if(fProngID) delete [] fProngID;
170 //---------------------------------------------------------------------------
171 AliKFParticle *AliAODRecoDecayHF::ApplyVertexingKF(Int_t *iprongs,Int_t nprongs,Int_t *pdgs,Bool_t topoCostraint, Double_t bzkG, Double_t *mass) const {
173 // Applies the KF vertexer
174 // Int_t iprongs[nprongs] = indices of the prongs to be used from the vertexer
175 // Int_t pdgs[nprongs] = pdgs assigned to the prongs, needed to define the AliKFParticle
176 // Bool_t topoCostraint = if kTRUE, the topological constraint is applied
177 // Double_t bzkG = magnetic field
178 // Double_t mass[2] = {mass, sigma} for the mass constraint (if mass[0]>0 the constraint is applied).
181 AliKFParticle::SetField(bzkG);
182 AliKFParticle *vertexKF=0;
185 Int_t nt=0,ntcheck=0;
187 Double_t pos[3]={0.,0.,0.};
188 if(!fOwnPrimaryVtx) {
189 printf("AliAODRecoDecayHF::ApplyVertexingKF(): cannot apply because primary vertex is not found\n");
192 fOwnPrimaryVtx->GetXYZ(pos);
193 Int_t contr=fOwnPrimaryVtx->GetNContributors();
194 Double_t covmatrix[6]={0.,0.,0.,0.,0.,0.};
195 fOwnPrimaryVtx->GetCovarianceMatrix(covmatrix);
196 Double_t chi2=fOwnPrimaryVtx->GetChi2();
197 AliESDVertex primaryVtx2(pos,covmatrix,chi2,contr,"Vertex");
201 copyKF=AliKFVertex(primaryVtx2);
202 nt=primaryVtx2.GetNContributors();
206 vertexKF = new AliKFParticle();
207 for(Int_t i= 0;i<nprongs;i++){
208 Int_t ipr=iprongs[i];
209 AliAODTrack *aodTrack = (AliAODTrack*)GetDaughter(ipr);
211 printf("AliAODRecoDecayHF::ApplyVertexingKF(): no daughters available\n");
212 delete vertexKF; vertexKF=NULL;
215 AliKFParticle daughterKF(*aodTrack,pdgs[i]);
216 vertexKF->AddDaughter(daughterKF);
218 if(topoCostraint && nt>0){
219 //Int_t index=(Int_t)GetProngID(ipr);
220 if(!aodTrack->GetUsedForPrimVtxFit()) continue;
221 copyKF -= daughterKF;
228 copyKF += (*vertexKF);
229 vertexKF->SetProductionVertex(copyKF);
234 vertexKF->SetMassConstraint(mass[0],mass[1]);
239 //---------------------------------------------------------------------------
240 AliAODVertex* AliAODRecoDecayHF::RemoveDaughtersFromPrimaryVtx(AliAODEvent *aod) {
242 // This method returns a primary vertex without the daughter tracks of the
243 // candidate and it recalculates the impact parameters and errors.
245 // The output vertex is created with "new". The user has to
246 // set it to the candidate with SetOwnPrimaryVtx(), unset it at the end
247 // of processing with UnsetOwnPrimaryVtx() and delete it.
248 // If a NULL pointer is returned, the removal failed (too few tracks left).
250 // For the moment, the primary vertex is recalculated from scratch without
251 // the daughter tracks.
254 AliAODVertex *vtxAOD = aod->GetPrimaryVertex();
255 if(!vtxAOD) return 0;
256 TString title=vtxAOD->GetTitle();
257 if(!title.Contains("VertexerTracks")) return 0;
261 AliVertexerTracks *vertexer = new AliVertexerTracks(aod->GetMagneticField());
263 Int_t ndg = GetNDaughters();
265 vertexer->SetITSMode();
266 vertexer->SetMinClusters(3);
267 vertexer->SetConstraintOff();
269 if(title.Contains("WithConstraint")) {
270 Float_t diamondcovxy[3];
271 aod->GetDiamondCovXY(diamondcovxy);
272 Double_t pos[3]={aod->GetDiamondX(),aod->GetDiamondY(),0.};
273 Double_t cov[6]={diamondcovxy[0],diamondcovxy[1],diamondcovxy[2],0.,0.,10.*10.};
274 AliESDVertex *diamond = new AliESDVertex(pos,cov,1.,1);
275 vertexer->SetVtxStart(diamond);
276 delete diamond; diamond=NULL;
280 Int_t nTrksToSkip=0,id;
282 for(Int_t i=0; i<ndg; i++) {
283 t = (AliAODTrack*)GetDaughter(i);
284 id = (Int_t)t->GetID();
286 skipped[nTrksToSkip++] = id;
288 vertexer->SetSkipTracks(nTrksToSkip,skipped);
289 AliESDVertex *vtxESDNew = vertexer->FindPrimaryVertex(aod);
291 delete vertexer; vertexer=NULL;
293 if(!vtxESDNew) return 0;
294 if(vtxESDNew->GetNContributors()<=0) {
295 delete vtxESDNew; vtxESDNew=NULL;
299 // convert to AliAODVertex
300 Double_t pos[3],cov[6],chi2perNDF;
301 vtxESDNew->GetXYZ(pos); // position
302 vtxESDNew->GetCovMatrix(cov); //covariance matrix
303 chi2perNDF = vtxESDNew->GetChi2toNDF();
304 delete vtxESDNew; vtxESDNew=NULL;
306 AliAODVertex *vtxAODNew = new AliAODVertex(pos,cov,chi2perNDF);
308 RecalculateImpPars(vtxAODNew,aod);
312 //-----------------------------------------------------------------------------------
313 void AliAODRecoDecayHF::RecalculateImpPars(AliAODVertex *vtxAODNew,AliAODEvent* aod) {
315 // now recalculate the daughters impact parameters
317 AliExternalTrackParam *etp = 0;
318 Double_t dz[2],covdz[3];
319 for(Int_t i=0; i<GetNDaughters(); i++) {
320 AliAODTrack *t = (AliAODTrack*)GetDaughter(i);
321 etp = new AliExternalTrackParam(t);
322 if(etp->PropagateToDCA(vtxAODNew,aod->GetMagneticField(),3.,dz,covdz)) {
324 fd0err[i] = TMath::Sqrt(covdz[0]);
326 delete etp; etp=NULL;
331 //-----------------------------------------------------------------------------------
332 void AliAODRecoDecayHF::Misalign(TString misal) {
334 // Method to smear the impact parameter of the duaghter tracks
335 // and the sec. vtx position accordinlgy
336 // Useful to study effect of misalignment.
337 // The starting point are parameterisations of the impact parameter resolution
339 // Errors on d0 and vtx are not recalculated (to be done)
341 if(misal=="null")return;
342 Double_t pard0rphiMC[3]={36.7,36.,1.25};// d0(pt)=[0]+[1]/(pt^[2]); in micron, conversion to cm is done later
343 Double_t pard0rphimisal[3]={0,0,0};
344 Double_t pard0zMC[3]={85.,130.,0.7};// d0(pt)=[0]+[1]/(pt^[2]); in micron, conversion to cm is done later
345 Double_t pard0zmisal[3]={0,0,0};
347 //use this to reproduce data d0(pt) trend for pions
348 pard0rphimisal[0]=37.;
349 pard0rphimisal[1]=37.5;
350 pard0rphimisal[2]=1.25;
355 else if(misal=="resB") {
356 // temporary values: asymptotic value larger by a factor 1.2 w.r.t. MC
357 pard0rphimisal[0]=44.4;
358 pard0rphimisal[1]=37.5;
359 pard0rphimisal[2]=1.25;
360 pard0zmisal[0]=115.2;
364 else if(misal=="resC") {
365 // temporary values: slightly larger asymptotic value, larger values at low pt
366 pard0rphimisal[0]=40.;
367 pard0rphimisal[1]=40.;
368 pard0rphimisal[2]=1.3;
373 else printf("AliAODRecoDecayHF::Misalign(): wrong misalign type specified \n");
376 AliAODVertex *evVtx=0x0,*secVtx=0x0;
377 Double_t evVtxPos[3]={-9999.,-9999.,-9999.},secVtxPos[3]={-9999.,9999.,9999.};
378 if(fOwnPrimaryVtx)fOwnPrimaryVtx->GetXYZ(evVtxPos);
380 evVtx=(AliAODVertex*)(fEventPrimaryVtx.GetObject());
381 evVtx->GetXYZ(evVtxPos);
383 secVtx=(AliAODVertex*)GetSecondaryVtx();
384 secVtx->GetXYZ(secVtxPos);
386 TVector3 v2v1(secVtxPos[0]-evVtxPos[0],secVtxPos[1]-evVtxPos[1],0.);
388 Double_t sigmarphinull,sigmarphimisal,sigmarphiadd;
389 Double_t sigmaznull,sigmazmisal,sigmazadd;
390 Double_t deltad0rphi[10],deltad0z[10];
392 // loop on the two prongs
393 for(Int_t i=0; i<fNProngs; i++) {
394 sigmarphinull = pard0rphiMC[0]+pard0rphiMC[1]/TMath::Power(PtProng(i),pard0rphiMC[2]);
395 sigmarphimisal = pard0rphimisal[0]+pard0rphimisal[1]/TMath::Power(PtProng(i),pard0rphimisal[2]);
396 if(sigmarphimisal>sigmarphinull) {
397 sigmarphiadd = TMath::Sqrt(sigmarphimisal*sigmarphimisal-
398 sigmarphinull*sigmarphinull);
399 deltad0rphi[i] = gRandom->Gaus(0.,sigmarphiadd);
404 sigmaznull = pard0zMC[0]+pard0zMC[1]/TMath::Power(PtProng(i),pard0zMC[2]);
405 sigmazmisal = pard0zmisal[0]+pard0zmisal[1]/TMath::Power(PtProng(i),pard0zmisal[2]);
406 if(sigmazmisal>sigmaznull) {
407 sigmazadd = TMath::Sqrt(sigmazmisal*sigmazmisal-
408 sigmaznull*sigmaznull);
409 deltad0z[i] = gRandom->Gaus(0.,sigmazadd);
414 TVector3 pxy(fPx[i],fPy[i],0.);
415 TVector3 pxycrossv2v1=pxy.Cross(v2v1);
416 if( pxycrossv2v1.Z()*fd0[i] > 0 ) {
417 secVtxPos[0]+=1.e-4*deltad0rphi[i]*(-fPy[i])/PtProng(i);// e-4: conversion to cm
418 secVtxPos[1]+=1.e-4*deltad0rphi[i]*(+fPx[i])/PtProng(i);
420 secVtxPos[0]+=1.e-4*deltad0rphi[i]*(+fPy[i])/PtProng(i);
421 secVtxPos[1]+=1.e-4*deltad0rphi[i]*(-fPx[i])/PtProng(i);
425 fd0[i] += 1.e-4*deltad0rphi[i]; // e-4: conversion to cm
426 // change secondary vertex z
427 secVtxPos[2]+=0.5e-4*deltad0z[i];
429 secVtx->SetX(secVtxPos[0]);
430 secVtx->SetY(secVtxPos[1]);
431 secVtx->SetZ(secVtxPos[2]);