+++ /dev/null
-/**************************************************************************
- * Author: Paraskevi Ganoti, University of Athens (pganoti@phys.uoa.gr) *
- * Contributors are mentioned in the code where appropriate. *
- * *
- * Permission to use, copy, modify and distribute this software and its *
- * documentation strictly for non-commercial purposes is hereby granted *
- * without fee, provided that the above copyright notice appears in all *
- * copies and that both the copyright notice and this permission notice *
- * appear in the supporting documentation. The authors make no claims *
- * about the suitability of this software for any purpose. It is *
- * provided "as is" without express or implied warranty. *
- **************************************************************************/
-
-//----------------------------------------------------------------------------------------------------------------
-// class AliResonanceKinkLikeSign
-// Example of an analysis task for producing a like-sign background for resonances having at least one
-// kaon-kink in their decay products.
-// Background is calculated from a positive kaon kink and a negative track.
-//-----------------------------------------------------------------------------------------------------------------
-
-#include "AliESDEvent.h"
-#include "TH1D.h"
-#include "TH2D.h"
-#include "TF1.h"
-#include "TDatabasePDG.h"
-#include "TLorentzVector.h"
-#include "AliESDkink.h"
-
-#include "AliResonanceKinkLikeSign.h"
-
-ClassImp(AliResonanceKinkLikeSign)
-
-//________________________________________________________________________
-AliResonanceKinkLikeSign::AliResonanceKinkLikeSign(const char *name)
- : AliAnalysisTaskSE(name), fDebug(0), fListOfHistos(0), f1(0), f2(0), fPosKaonLikeSign(0), fLikeSignInvmassPt(0), fMaxNSigmaToVertex(0), fMinPtTrackCut(0), fMaxDCAxy(0), fMaxDCAzaxis(0),
-fMinTPCclusters(0),fMaxChi2PerTPCcluster(0), fMaxCov0(0), fMaxCov2(0), fMaxCov5(0) , fMaxCov9(0), fMaxCov14(0), fdaughter1pdg(0), fdaughter2pdg(0), fnbins(0), fnlowx(0), fnhighx(0), floweta(0), fuppereta(0), fminKinkRadius(0), fmaxKinkRadius(0), fminQt(0), fmaxQt(0), fptbins(0), flowpt(0), fupperpt(0), fmaxAbsEtaCut(0)
-
-{
- // Constructor
-
- // Define input and output slots here
- // Input slot #0 works with a TChain
- DefineOutput(1, TList::Class());
-}
-
-//________________________________________________________________________
-void AliResonanceKinkLikeSign::UserCreateOutputObjects()
-{
- // Create histograms
- // Called once
-
- f1=new TF1("f1","((atan([0]*[1]*(1.0/(sqrt((x^2)*(1.0-([1]^2))-([0]^2)*([1]^2))))))*180.)/[2]",1.1,10.0);
- f1->SetParameter(0,0.493677);
- f1->SetParameter(1,0.9127037);
- f1->SetParameter(2,TMath::Pi());
-
- f2=new TF1("f2","((atan([0]*[1]*(1.0/(sqrt((x^2)*(1.0-([1]^2))-([0]^2)*([1]^2))))))*180.)/[2]",0.1,10.0);
- f2->SetParameter(0,0.13957018);
- f2->SetParameter(1,0.2731374);
- f2->SetParameter(2,TMath::Pi());
-
- fPosKaonLikeSign=new TH1D("fPosKaonLikeSign"," ", fnbins, fnlowx, fnhighx);
- fLikeSignInvmassPt=new TH2D("fLikeSignInvmassPt"," ", fnbins, fnlowx, fnhighx, fptbins, flowpt, fupperpt);
-
- fListOfHistos=new TList();
- fListOfHistos->Add(fPosKaonLikeSign);
- fListOfHistos->Add(fLikeSignInvmassPt);
-
-}
-
-//________________________________________________________________________
-void AliResonanceKinkLikeSign::UserExec(Option_t *)
-{
- // Main loop
- // Called for each event
-
- AliVEvent *event = InputEvent();
- if (!event) {
- Printf("ERROR: Could not retrieve event");
- return;
- }
-
- AliESDEvent* esd = dynamic_cast<AliESDEvent*>(event);
- if (!esd) {
- Printf("ERROR: Could not retrieve esd");
- return;
- }
-
- Double_t daughter1Mass, daughter2Mass;
-
- if (fdaughter1pdg==kKPlus) {
- daughter1Mass=TDatabasePDG::Instance()->GetParticle(fdaughter1pdg)->Mass();
- daughter2Mass=TDatabasePDG::Instance()->GetParticle(fdaughter2pdg)->Mass();
- }
-
- if (fdaughter1pdg!=kKPlus) {
- daughter1Mass=TDatabasePDG::Instance()->GetParticle(fdaughter2pdg)->Mass();
- daughter2Mass=TDatabasePDG::Instance()->GetParticle(fdaughter1pdg)->Mass();
- } // to ensure that daughter1Mass has always the kaon mass
-
- if (!esd) {
- Printf("ERROR: esd not available");
- return;
- }
-
- const AliESDVertex* vertex = GetEventVertex(esd);
- if(!vertex) return;
-
- Double_t ptrackpos[3], ptrackneg[3];
-
- TLorentzVector p4pos;
- TLorentzVector p4neg;
- TLorentzVector p4comb;
-
- for (Int_t iTracks = 0; iTracks < esd->GetNumberOfTracks(); iTracks++) {
-
- AliESDtrack* trackpos = esd->GetTrack(iTracks);
- if (!trackpos) {
- if (fDebug > 0) Printf("ERROR: Could not receive track %d", iTracks);
- continue;
- }
- if (trackpos->GetSign() < 0) continue;
-
- AliExternalTrackParam *tpcTrackpos = (AliExternalTrackParam *)trackpos->GetTPCInnerParam();
- if(!tpcTrackpos) continue;
- ptrackpos[0]=tpcTrackpos->Px();
- ptrackpos[1]=tpcTrackpos->Py();
- ptrackpos[2]=tpcTrackpos->Pz();
-
- Bool_t firstLevelAcceptPosTrack=IsAcceptedForKink(esd, vertex, trackpos);
- if(firstLevelAcceptPosTrack==kFALSE) continue;
-
- TVector3 posTrackMom(ptrackpos[0],ptrackpos[1],ptrackpos[2]);
-
- Int_t indexKinkPos=trackpos->GetKinkIndex(0);
- Bool_t posKaonKinkFlag=0;
- if(indexKinkPos<0) posKaonKinkFlag=IsKink(esd, indexKinkPos, posTrackMom);
- if(posKaonKinkFlag==0) continue;
- if(posKaonKinkFlag==1) p4pos.SetVectM(posTrackMom, daughter1Mass);
-
- for (Int_t j=0; j<esd->GetNumberOfTracks(); j++) {
- if(iTracks==j) continue;
- AliESDtrack* trackneg=esd->GetTrack(j);
- if (!trackneg) {
- if (fDebug > 0) Printf("ERROR: Could not receive track %d", j);
- continue;
- }
- if (trackneg->GetSign() < 0) continue;
-
- AliExternalTrackParam *tpcTrackneg = (AliExternalTrackParam *)trackneg->GetTPCInnerParam();
- if(!tpcTrackneg) continue;
- ptrackneg[0]=tpcTrackneg->Px();
- ptrackneg[1]=tpcTrackneg->Py();
- ptrackneg[2]=tpcTrackneg->Pz();
-
- Bool_t firstLevelAcceptNegTrack=IsAcceptedForKink(esd, vertex, trackneg);
- if(firstLevelAcceptNegTrack==kFALSE) continue;
-
- TVector3 negTrackMom(ptrackneg[0],ptrackneg[1],ptrackneg[2]);
-
- Bool_t secondLevelAcceptNegTrack=IsAcceptedForTrack(esd, vertex, trackneg);
- if(secondLevelAcceptNegTrack==kFALSE) continue;
-
- p4neg.SetVectM(negTrackMom, daughter2Mass);
-
- p4comb=p4pos;
- p4comb+=p4neg;
-
- if(p4comb.Vect().Pt()<=fMinPtTrackCut) continue;
-
- if((TMath::Abs(p4pos.Vect().Eta())<fmaxAbsEtaCut)&&(TMath::Abs(p4neg.Vect().Eta())<fmaxAbsEtaCut)&&(p4comb.Vect().Eta()<fmaxAbsEtaCut)) {
-
- fPosKaonLikeSign->Fill(p4comb.M());
- fLikeSignInvmassPt->Fill(p4comb.M(), p4comb.Vect().Pt());
-
- }
-
- } //inner track loop
-
- } //outer track loop
-
- PostData(1, fListOfHistos);
-}
-
-//________________________________________________________________________
-void AliResonanceKinkLikeSign::Terminate(Option_t *)
-{
-
-}
-
-//____________________________________________________________________//
-
-Float_t AliResonanceKinkLikeSign::GetSigmaToVertex(AliESDtrack* esdTrack) const {
- // Calculates the number of sigma to the vertex.
-
- Float_t b[2];
- Float_t bRes[2];
- Float_t bCov[3];
-
- esdTrack->GetImpactParameters(b,bCov);
-
- if (bCov[0]<=0 || bCov[2]<=0) {
- //AliDebug(1, "Estimated b resolution lower or equal zero!");
- bCov[0]=0; bCov[2]=0;
- }
- bRes[0] = TMath::Sqrt(bCov[0]);
- bRes[1] = TMath::Sqrt(bCov[2]);
-
- if (bRes[0] == 0 || bRes[1] ==0) return -1;
-
- Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));
-
- if (TMath::Exp(-d * d / 2) < 1e-10) return 1000;
-
- d = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
-
- return d;
-}
-
-//____________________________________________________________________//
-
-const AliESDVertex* AliResonanceKinkLikeSign::GetEventVertex(const AliESDEvent* esd) const
-
-{
- // Get the vertex
-
- const AliESDVertex* vertex = esd->GetPrimaryVertex();
-
- if((vertex->GetStatus()==kTRUE)&&(vertex->GetNContributors()>2)) return vertex;
- else
- {
- vertex = esd->GetPrimaryVertexSPD();
- if((vertex->GetStatus()==kTRUE)&&(vertex->GetNContributors()>2)) return vertex;
- else
- return 0;
- }
-}
-
-//________________________________________________________________________
-
- Bool_t AliResonanceKinkLikeSign::IsAcceptedForKink(AliESDEvent *localesd,
- const AliESDVertex *localvertex, AliESDtrack* localtrack) {
- // Apply the selections for each kink
-
- Double_t gPt = 0.0, gPx = 0.0, gPy = 0.0, gPz = 0.0;
- Double_t dca[2] = {0.0,0.0}, cov[3] = {0.0,0.0,0.0}; //The impact parameters and their covariance.
- Double_t dca3D = 0.0;
-
- AliExternalTrackParam *tpcTrack = (AliExternalTrackParam *)localtrack->GetTPCInnerParam();
- if(!tpcTrack) {
- gPt = 0.0; gPx = 0.0; gPy = 0.0; gPz = 0.0;
- dca[0] = -100.; dca[1] = -100.; dca3D = -100.;
- cov[0] = -100.; cov[1] = -100.; cov[2] = -100.;
- }
- else {
- gPt = tpcTrack->Pt();
- gPx = tpcTrack->Px();
- gPy = tpcTrack->Py();
- gPz = tpcTrack->Pz();
- tpcTrack->PropagateToDCA(localvertex,
- localesd->GetMagneticField(),100.,dca,cov);
- }
-
- if(GetSigmaToVertex(localtrack) > fMaxNSigmaToVertex) {
- if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a %lf sigmas to vertex TPC (max. requested: %lf)", GetSigmaToVertex(localtrack),fMaxNSigmaToVertex);
- return kFALSE;
- }
-
- if(TMath::Abs(dca[0]) > fMaxDCAxy) {
- if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a value of dca(xy) (TPC) of %lf (max. requested: %lf)", TMath::Abs(dca[0]), fMaxDCAxy);
- return kFALSE;
- }
-
- if(TMath::Abs(dca[1]) > fMaxDCAzaxis) {
- if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a value of dca(z) of %lf (max. requested: %lf)", TMath::Abs(dca[1]), fMaxDCAzaxis);
- return kFALSE;
- }
-
- if(gPt <= fMinPtTrackCut) {
- if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a min value of pt of %lf (min. requested: %lf)", gPt, fMinPtTrackCut);
- return kFALSE;
- }
-
- return kTRUE;
-}
-
-//________________________________________________________________________
-Bool_t AliResonanceKinkLikeSign::IsAcceptedForTrack(AliESDEvent *localesd, const AliESDVertex *localvertex, AliESDtrack *localtrack) {
- // Apply the selections for each track
-
- Double_t gPt = 0.0, gPx = 0.0, gPy = 0.0, gPz = 0.0;
- Double_t dca[2] = {0.0,0.0}, cov[3] = {0.0,0.0,0.0}; //The impact parameters and their covariance.
- Double_t dca3D = 0.0;
-
- AliExternalTrackParam *tpcTrack = (AliExternalTrackParam *)localtrack->GetTPCInnerParam();
- if(!tpcTrack) {
- gPt = 0.0; gPx = 0.0; gPy = 0.0; gPz = 0.0;
- dca[0] = -100.; dca[1] = -100.; dca3D = -100.;
- cov[0] = -100.; cov[1] = -100.; cov[2] = -100.;
- }
- else {
- gPt = tpcTrack->Pt();
- gPx = tpcTrack->Px();
- gPy = tpcTrack->Py();
- gPz = tpcTrack->Pz();
- tpcTrack->PropagateToDCA(localvertex,
- localesd->GetMagneticField(),100.,dca,cov);
- }
-
- Int_t fcls[200];
- Int_t nClustersTPC=localtrack->GetTPCclusters(fcls);
- Float_t chi2perTPCcluster=-1.0;
- if(nClustersTPC!=0) chi2perTPCcluster=(localtrack->GetTPCchi2())/Float_t(nClustersTPC);
-
- Double_t extCov[15];
- localtrack->GetExternalCovariance(extCov);
-
- if((localtrack->GetStatus() & AliESDtrack::kTPCrefit) == 0) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because of no refited in TPC");
- return kFALSE;
- }
-
- if(nClustersTPC < fMinTPCclusters) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of nclusters (TPC) of %d (min. requested: %d)", nClustersTPC, fMinTPCclusters);
- return kFALSE;
- }
-
- if(chi2perTPCcluster > fMaxChi2PerTPCcluster) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of chi2perTPCcluster of %lf (max. requested: %lf)", chi2perTPCcluster, fMaxChi2PerTPCcluster);
- return kFALSE;
- }
-
- if(extCov[0] > fMaxCov0) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[0] of %lf (max. requested: %lf)", extCov[0], fMaxCov0);
- return kFALSE;
- }
-
- if(extCov[2] > fMaxCov2) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[2] of %lf (max. requested: %lf)", extCov[2], fMaxCov2);
- return kFALSE;
- }
-
- if(extCov[5] > fMaxCov5) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[5] of %lf (max. requested: %lf)", extCov[5], fMaxCov5);
- return kFALSE;
- }
-
- if(extCov[9] > fMaxCov9) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[9] of %lf (max. requested: %lf)", extCov[9], fMaxCov9);
- return kFALSE;
- }
-
- if(extCov[14] > fMaxCov14) {
- if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[14] of %lf (max. requested: %lf)", extCov[14], fMaxCov14);
- return kFALSE;
- }
-
- return kTRUE;
-
-}
-
-//________________________________________________________________________
-Bool_t AliResonanceKinkLikeSign::IsKink(AliESDEvent *localesd, Int_t kinkIndex, TVector3 trackMom)
-{
- // Test some kinematical criteria for each kink
-
- AliESDkink *kink=localesd->GetKink(TMath::Abs(kinkIndex)-1);
- const TVector3 motherMfromKink(kink->GetMotherP());
- const TVector3 daughterMKink(kink->GetDaughterP());
- Float_t qt=kink->GetQt();
-
- Double_t maxDecAngKmu=f1->Eval(motherMfromKink.Mag(),0.,0.,0.);
- Double_t maxDecAngpimu=f2->Eval(motherMfromKink.Mag(),0.,0.,0.);
-
- Float_t kinkAngle=TMath::RadToDeg()*kink->GetAngle(2);
-
- Float_t energyDaughterMu=TMath::Sqrt(daughterMKink.Mag()*daughterMKink.Mag()+0.105658*0.105658);
- Float_t p1XM= motherMfromKink.Px();
- Float_t p1YM= motherMfromKink.Py();
- Float_t p1ZM= motherMfromKink.Pz();
- Float_t p2XM= daughterMKink.Px();
- Float_t p2YM= daughterMKink.Py();
- Float_t p2ZM= daughterMKink.Pz();
- Float_t p3Daughter=TMath::Sqrt(((p1XM-p2XM)*(p1XM-p2XM))+((p1YM-p2YM)*(p1YM-p2YM))+((p1ZM-p2ZM)*(p1ZM-p2ZM)));
- Double_t invariantMassKmu= TMath::Sqrt((energyDaughterMu+p3Daughter)*(energyDaughterMu+p3Daughter)-motherMfromKink.Mag()*motherMfromKink.Mag());
-
- if((kinkAngle>maxDecAngpimu)&&(qt>fminQt)&&(qt<fmaxQt)&&((kink->GetR()>fminKinkRadius)&&(kink->GetR()<fmaxKinkRadius))&&(TMath::Abs(trackMom.Eta())<fmaxAbsEtaCut)&&(invariantMassKmu<0.6)) {
-
- if(trackMom.Mag()<=1.1) {
- return kTRUE;
- }
- else
- if (kinkAngle<maxDecAngKmu) {
- return kTRUE;
- }
- }
- return kFALSE;
-}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff