--- /dev/null
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * *
+ * Author: The ALICE Off-line Project. *
+ * 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. *
+ **************************************************************************/
+
+//----------------------------------------------------------------------------
+// Implementation of the BtoJPSItoEle class
+// for pp and PbPb interactions
+// Note: the two decay tracks are labelled: 0 (positive electron)
+// 1 (negative electron)
+// Origin: G.E. Bruno giuseppe.bruno@ba.infn.it
+// based on Class for charm golden channel (D0->Kpi)
+//----------------------------------------------------------------------------
+
+// #include <Riostream.h> // for debugging
+
+#include <TH1.h>
+#include <TH2.h>
+#include <TCanvas.h>
+#include <TPaveLabel.h>
+#include <TVector3.h>
+
+#include "AliBtoJPSItoEle.h"
+
+ClassImp(AliBtoJPSItoEle)
+
+//----------------------------------------------------------------------------
+AliBtoJPSItoEle::AliBtoJPSItoEle() {
+ // Default constructor
+
+ fSignal = kFALSE;
+ fJpsiPrimary = kFALSE;
+
+ fEvent = 0;
+
+ fTrkNum[0] = 0;
+ fTrkNum[1] = 0;
+
+ fV1x = 0.;
+ fV1y = 0.;
+ fV1z = 0.;
+ fV2x = 0.;
+ fV2y = 0.;
+ fV2z = 0.;
+ fDCA = 0.;
+
+ fPx[0] = 0.;
+ fPy[0] = 0.;
+ fPz[0] = 0.;
+ fPx[1] = 0.;
+ fPy[1] = 0.;
+ fPz[1] = 0.;
+
+ fd0[0] = 0.;
+ fd0[1] = 0.;
+
+ fPdg[0] = 0;
+ fPdg[1] = 0;
+ fMum[0] = 0;
+ fMum[1] = 0;
+ fGMum[0] = 0;
+ fGMum[1] = 0;
+
+ fTagPi[0] = 0.;
+ fTagPi[1] = 0.;
+ fTagKa[0] = 0.;
+ fTagKa[1] = 0.;
+ fTagNid[0] = 0.;
+ fTagNid[1] = 0.;
+
+ fWgtJPsi=0;
+
+}
+//----------------------------------------------------------------------------
+AliBtoJPSItoEle::AliBtoJPSItoEle(Int_t ev,Int_t trkNum[2],
+ Double_t v1[3],Double_t v2[3],
+ Double_t dca,
+ Double_t mom[6],Double_t d0[2]) {
+ // Constructor
+
+ fSignal = kFALSE;
+ fJpsiPrimary = kFALSE;
+
+ fEvent = ev;
+ fTrkNum[0] = trkNum[0];
+ fTrkNum[1] = trkNum[1];
+
+ fV1x = v1[0];
+ fV1y = v1[1];
+ fV1z = v1[2];
+ fV2x = v2[0];
+ fV2y = v2[1];
+ fV2z = v2[2];
+ fDCA = dca;
+
+ fPx[0] = mom[0];
+ fPy[0] = mom[1];
+ fPz[0] = mom[2];
+ fPx[1] = mom[3];
+ fPy[1] = mom[4];
+ fPz[1] = mom[5];
+
+ fd0[0] = d0[0];
+ fd0[1] = d0[1];
+
+ fPdg[0] = 0;
+ fPdg[1] = 0;
+ fMum[0] = 0;
+ fMum[1] = 0;
+ fGMum[0] = 0;
+ fGMum[1] = 0;
+
+ fTagPi[0] = 0.;
+ fTagPi[1] = 0.;
+ fTagKa[0] = 0.;
+ fTagKa[1] = 0.;
+ fTagNid[0] = 0.;
+ fTagNid[1] = 0.;
+
+ fWgtJPsi=0;
+}
+//----------------------------------------------------------------------------
+AliBtoJPSItoEle::~AliBtoJPSItoEle() {}
+//____________________________________________________________________________
+AliBtoJPSItoEle::AliBtoJPSItoEle( const AliBtoJPSItoEle& btoJpsi):TObject(btoJpsi) {
+ // dummy copy constructor
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEle::ApplyPID(TString pidScheme) {
+ // Applies particle identification
+
+ if(!pidScheme.CompareTo("TRDTPCparam") && fPdg[0]==0) {
+ printf("AliBtoJPSItoEle::ApplyPID :\n Warning: TRD-TPC parameterized PID can be used only for simulation!\n");
+ return;
+ }
+
+ if(!pidScheme.CompareTo("TRDTPCparam")) {
+ // tagging of the positive track
+ if(TMath::Abs(fPdg[0])==11) { // electron
+ fTagEl[0] = 0.81;
+ fTagNid[0] = 1.-fTagEl[0];
+ }
+ else if(TMath::Abs(fPdg[0])==211) { // pion
+ fTagEl[0] = TRDTPCCombinedPIDParametrization(PChild(0));
+ fTagNid[0] = 1.-fTagEl[0];
+ }
+ else { // all the others
+ fTagEl[0] = 0.;
+ fTagNid[0] = 1.;
+ }
+ // tagging of the negative track
+ if(TMath::Abs(fPdg[1])==11) { // electron
+ fTagEl[1] = 0.81;
+ fTagNid[1] = 1.-fTagEl[1];
+ }
+ else if(TMath::Abs(fPdg[1])==211) { // pion
+ fTagEl[1] = TRDTPCCombinedPIDParametrization(PChild(1));
+ fTagNid[1] = 1.-fTagEl[1];
+ }
+ else { // all the others
+ fTagEl[1] = 0.;
+ fTagNid[1] = 1.;
+ }
+ }
+
+ if(!pidScheme.CompareTo("ESDCombinedPID")) {
+ fTagEl[0]=fPIDrespEl[0];
+ fTagEl[1]=fPIDrespEl[1];
+ fTagNid[0] = 1.-fTagEl[0];
+ fTagNid[1] = 1.-fTagEl[1];
+ }
+ return;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::ChildrenRelAngle() const {
+ // relative angle between K and pi
+
+ TVector3 mom0(fPx[0],fPy[0],fPz[0]);
+ TVector3 mom1(fPx[1],fPy[1],fPz[1]);
+
+ Double_t angle = mom0.Angle(mom1);
+
+ return angle;
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEle::ComputeWgts() {
+ // calculate the weights for PID
+
+
+ // assignement of the weights from PID
+ fWgtJPsi = fTagEl[0]*fTagEl[1]; // both assumed to be electrons
+
+
+ // if(fWgtJPsi<0.) cerr<<"AliBtoJPSItoEle::ComputeWgts() Negative weight!!!\n";
+
+
+ return;
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEle::CorrectWgt4BR(Double_t factor) {
+ // correct weights of background from charm
+
+ fWgtJPsi *= factor;
+
+ return;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::CosPointing() const {
+ // cosine of pointing angle in space
+
+ TVector3 mom(Px(),Py(),Pz());
+ TVector3 flight(fV2x-fV1x,fV2y-fV1y,fV2z-fV1z);
+
+ Double_t pta = mom.Angle(flight);
+
+ return TMath::Cos(pta);
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::CosPointingXY() const {
+ // cosine of pointing angle in transverse plane
+
+ TVector3 momXY(Px(),Py(),0.);
+ TVector3 flightXY(fV2x-fV1x,fV2y-fV1y,0.);
+
+ Double_t ptaXY = momXY.Angle(flightXY);
+
+ return TMath::Cos(ptaXY);
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEle::CosThetaStar(Double_t &ctsJPsi) const {
+ // cosine of decay angle in the J/Psi rest frame (of the negative electron)
+
+ Double_t pStar = TMath::Sqrt(TMath::Power(kMJPsi*kMJPsi-2.*kMe*kMe,2.)-4.*kMe*kMe*kMe*kMe)/(2.*kMJPsi);
+
+ Double_t beta = P()/Energy();
+ Double_t gamma = Energy()/kMJPsi;
+
+ ctsJPsi = (Ql(1)/gamma-beta*TMath::Sqrt(pStar*pStar+kMe*kMe))/pStar;
+ // if(ctsJPsi > 1.) { cerr<<"AliBtoJPSItoEle::CosThetaStar: > 1 "<<ctsJPsi<<"!\n"; }
+ // if(ctsJPsi < -1.) { cerr<<"AliBtoJPSItoEle::CosThetaStar: < -1 "<<ctsJPsi<<"!\n"; }
+
+ return;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::Eta() const {
+ // pseudorapidity of the J/Psi
+
+ Double_t theta = TMath::Pi()/2.-TMath::ATan2(Pz(),Pt());
+ Double_t eta = -TMath::Log(TMath::Tan(theta/2.));
+ return eta;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::EtaChild(Int_t child) const {
+ // pseudorapidity of the decay tracks
+
+ Double_t theta = TMath::Pi()/2.-TMath::ATan2(fPz[child],PtChild(child));
+ Double_t eta = -TMath::Log(TMath::Tan(theta/2.));
+ return eta;
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEle::GetWgts(Double_t &WgtJPsi)
+ const {
+ // returns the weights for pid
+
+ WgtJPsi = fWgtJPsi;
+
+ return;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::ImpPar() const {
+ // J/Psi impact parameter in the bending plane
+
+ Double_t k = -(fV2x-fV1x)*Px()-(fV2y-fV1y)*Py();
+ k /= Pt()*Pt();
+ Double_t dx = fV2x-fV1x+k*Px();
+ Double_t dy = fV2y-fV1y+k*Py();
+ Double_t absDD = TMath::Sqrt(dx*dx+dy*dy);
+ TVector3 mom(Px(),Py(),Pz());
+ TVector3 flight(fV2x-fV1x,fV2y-fV1y,fV2z-fV1z);
+ TVector3 cross = mom.Cross(flight);
+ return (cross.Z()>0. ? absDD : -absDD);
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEle::InvMass(Double_t &mJPsi) const {
+ // invariant mass as J/Psi
+
+ Double_t energy[2];
+
+ // J/psi -> e- e+
+ energy[1] = TMath::Sqrt(kMe*kMe+PChild(1)*PChild(1));
+ energy[0] = TMath::Sqrt(kMe*kMe+PChild(0)*PChild(0));
+
+ mJPsi = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-P()*P());
+
+ return;
+
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::Ql(Int_t child) const {
+ // longitudinal momentum of decay tracks w.r.t. to J/Psi momentum
+
+ Double_t qL;
+ TVector3 mom(fPx[child],fPy[child],fPz[child]);
+ TVector3 momJPsi(Px(),Py(),Pz());
+
+ qL = mom.Dot(momJPsi)/momJPsi.Mag();
+
+ return qL ;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::Qt() const {
+ // transverse momentum of decay tracks w.r.t. to JPsi momentum
+
+ TVector3 mom0(fPx[0],fPy[0],fPz[0]);
+ TVector3 momJPsi(Px(),Py(),Pz());
+
+ return mom0.Perp(momJPsi);
+}
+//----------------------------------------------------------------------------
+Bool_t AliBtoJPSItoEle::Select(const Double_t* cuts,Int_t& okB)
+ const {
+//
+// This function compares the B candidates with a set of cuts:
+//
+// cuts[0] = inv. mass half width [GeV]
+// cuts[1] = dca [micron]
+// cuts[2] = cosThetaStar
+// cuts[3] = pTP [GeV/c]
+// cuts[4] = pTN [GeV/c]
+// cuts[5] = d0P [micron] upper limit!
+// cuts[6] = d0N [micron] upper limit!
+// cuts[7] = d0d0 [micron^2]
+// cuts[8] = cosThetaPoint
+//
+// If the candidate doesn't pass the cuts it sets the weight to 0
+// and return kFALSE
+//
+ Double_t mJPsi,ctsJPsi;
+ okB=1;
+
+ if(PtChild(1) < cuts[3] || PtChild(0) < cuts[4]) okB = 0;
+ if(!okB) return kFALSE;
+
+ if(TMath::Abs(Getd0Child(1)) > cuts[5] ||
+ TMath::Abs(Getd0Child(0)) > cuts[6]) okB = 0;
+ if(!okB) return kFALSE;
+
+ if(GetDCA() > cuts[1]) { okB = 0; return kFALSE; }
+
+ InvMass(mJPsi);
+ if(TMath::Abs(mJPsi-kMJPsi) > cuts[0]) okB = 0;
+ if(!okB) return kFALSE;
+
+ CosThetaStar(ctsJPsi);
+ if(TMath::Abs(ctsJPsi) > cuts[2]) okB = 0;
+ if(!okB) return kFALSE;
+
+ if(ProdImpParams() > cuts[7]) { okB = 0; return kFALSE; }
+
+ if(CosPointing() < cuts[8]) { okB = 0; return kFALSE; }
+
+ return kTRUE;
+}
+//-----------------------------------------------------------------------------
+void AliBtoJPSItoEle::SetPIDresponse(Double_t resp0[5],Double_t resp1[5]) {
+ // Set combined PID detector response probabilities
+
+ fPIDrespEl[0] = resp0[0];
+ fPIDrespEl[1] = resp1[0];
+ fPIDrespMu[0] = resp0[1];
+ fPIDrespMu[1] = resp1[1];
+ fPIDrespPi[0] = resp0[2];
+ fPIDrespPi[1] = resp1[2];
+ fPIDrespKa[0] = resp0[3];
+ fPIDrespKa[1] = resp1[3];
+ fPIDrespPr[0] = resp0[4];
+ fPIDrespPr[1] = resp1[4];
+
+ return;
+}
+//-----------------------------------------------------------------------------
+void AliBtoJPSItoEle::GetPIDresponse(Double_t resp0[5],Double_t resp1[5]) const {
+ // Get combined PID detector response probabilities
+
+ resp0[0] = fPIDrespEl[0];
+ resp1[0] = fPIDrespEl[1];
+ resp0[1] = fPIDrespMu[0];
+ resp1[1] = fPIDrespMu[1];
+ resp0[2] = fPIDrespPi[0];
+ resp1[2] = fPIDrespPi[1];
+ resp0[3] = fPIDrespKa[0];
+ resp1[3] = fPIDrespKa[1];
+ resp0[4] = fPIDrespPr[0];
+ resp1[4] = fPIDrespPr[1];
+
+ return;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEle::TRDTPCCombinedPIDParametrization(Double_t p) const {
+
+
+ // a first raw parametrization of the probability to misidentify a charged pion as electron as a
+ // function of the momentum, as given by the combined TPC and TRD response.
+ // PID cuts are set such that the probability for correct electron id is 90% in each of the two
+ // detectors
+
+// first estimate based on parameterization in the B-> single electron analysis
+ Double_t value=0;
+ Double_t p1 =11.;
+ Double_t p2=0.00007;
+ Double_t p3=0.007;
+ value=p2+p3*(1.-exp(-TMath::Power(p/p1,4.)));
+
+// Better estimation based on TRD test beam (as presented by Andrea at Munster)
+ value/=0.01; // here remove from TPC+TRD the TRD contribution estimated to be 0.01
+ if (p<10.) value*=(1.32-0.18*p+0.076*p*p-0.0037*p*p*p)/100.;
+ if (p>10.) value*=(0.48+0.287*p)/100.;
+
+ return value;
+}
+//----------------------------------------------------------------------------
+
+
+
+
+
--- /dev/null
+#ifndef AliBtoJPSItoEle_H
+#define AliBtoJPSItoEle_H
+/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * See cxx source for full Copyright notice */
+
+//-------------------------------------------------------------------------
+// Class AliBtoJPSItoEle
+// Reconstructed B -> J\PSI+X --> e+ e- *X class
+//
+// Note: the two decay tracks are labelled: 0 (positive electron)
+// 1 (negative electron)
+//
+// Origin: G.E. Bruno giuseppe.bruno@ba.infn.it
+// based on Class for charm golden channel (D0->Kpi) (thanks to Andrea Dainese!)
+//-------------------------------------------------------------------------
+
+#include <TObject.h>
+#include <TMath.h>
+
+//----------------------------------------------------------------------------
+// Some constants (masses)
+//
+// particle masses
+const Double_t kMJPsi = 3.096916; // J/Psi mass
+const Double_t kMe = 0.000510998902; // elec mass
+
+
+
+
+//-----------------------------------------------------------------------------
+class AliBtoJPSItoEle : public TObject {
+ public:
+ //
+ AliBtoJPSItoEle();
+ AliBtoJPSItoEle(Int_t ev,Int_t trkNum[2],
+ Double_t v1[3],Double_t v2[3],Double_t dca,
+ Double_t mom[6],Double_t d0[2]);
+ virtual ~AliBtoJPSItoEle();
+ AliBtoJPSItoEle(const AliBtoJPSItoEle& btoJpsi);
+
+ Double_t Alpha() const { return (Ql(0)-Ql(1))/(Ql(0)+Ql(1)); }
+ void ApplyPID(TString pidScheme="TRDTPCparam");
+ Double_t ChildrenRelAngle() const;
+ void ComputeWgts();
+ void CorrectWgt4BR(Double_t factor);
+ Double_t CosPointing() const;
+ Double_t CosPointingXY() const;
+ void CosThetaStar(Double_t &ctsJPSI) const;
+ Double_t Ct() const {return Length()*kMJPsi/P();}
+ Double_t Energy() const { return TMath::Sqrt(P()*P()+kMJPsi*kMJPsi); }
+ Double_t Eta() const;
+ Double_t EtaChild(Int_t child) const;
+ Int_t EventNo() const {return TMath::Abs(fEvent);}
+ Double_t GetDCA() const { return 10000.*fDCA; }
+ Int_t GetTrkNum(Int_t child) const { return fTrkNum[child]; }
+ Double_t Getd0Child(Int_t child) const { return fd0[child]; }
+ Int_t GetPdgChild(Int_t child) const { return fPdg[child]; }
+ Int_t GetPdgMum(Int_t child) const {return fMum[child]; }
+ Int_t GetPdgGMum(Int_t child) const {return fGMum[child]; }
+ void GetPIDresponse(Double_t resp0[5],Double_t resp1[5]) const;
+ void GetWgts(Double_t &WgtJPsi) const;
+ void GetPrimaryVtx(Double_t vtx[3]) const
+ { vtx[0]=fV1x; vtx[1]=fV1y; vtx[2]=fV1z; }
+ void GetSecondaryVtx(Double_t vtx[3]) const
+ { vtx[0]=fV2x; vtx[1]=fV2y; vtx[2]=fV2z; }
+
+ Double_t ImpPar() const;
+ void InvMass(Double_t &mJPsi) const;
+ Bool_t IsSignal() const { if(fSignal) return kTRUE; return kFALSE; }
+ Bool_t IsJpsiPrimary() const { if(fJpsiPrimary) return kTRUE; return kFALSE; }
+ Double_t Length() const
+ { return TMath::Sqrt((fV1x-fV2x)*(fV1x-fV2x)
+ +(fV1y-fV2y)*(fV1y-fV2y)+(fV1z-fV2z)*(fV1z-fV2z)); }
+ Double_t P() const { return TMath::Sqrt(Pt()*Pt()+Pz()*Pz()); }
+ Double_t PChild(Int_t child) const { return TMath::Sqrt(fPx[child]*fPx[child]+fPy[child]*fPy[child]+fPz[child]*fPz[child]); }
+ Double_t ProdImpParams() const { return fd0[0]*fd0[1]; }
+ Double_t Pt() const { return TMath::Sqrt(Px()*Px()+Py()*Py()); }
+ Double_t PtChild(Int_t child) const { return TMath::Sqrt(fPx[child]*fPx[child]+fPy[child]*fPy[child]); }
+ Double_t Px() const { return (fPx[0]+fPx[1]); }
+ Double_t Py() const { return (fPy[0]+fPy[1]); }
+ Double_t Pz() const { return (fPz[0]+fPz[1]); }
+ Double_t Ql(Int_t child) const;
+ Double_t Qt() const;
+ Double_t Rapidity() const { return 0.5*TMath::Log((Energy()+Pz())/(Energy()-Pz()+1.e-13)); }
+ Bool_t Select(const Double_t* cuts,Int_t& okB) const;
+ void SetPrimaryVtx(Double_t vtx[3])
+ { fV1x=vtx[0]; fV1y=vtx[1]; fV1z=vtx[2]; }
+ void SetSignal() { fSignal = kTRUE; }
+ void SetJpsiPrimary() { fJpsiPrimary = kTRUE; }
+ void SetTOFmasses(Double_t mass[2])
+ { fTOFmass[0]=mass[0]; fTOFmass[1]=mass[1]; }
+ void SetPIDresponse(Double_t resp0[5],Double_t resp1[5]);
+ void SetPdgCodes(Int_t pdg[2]) {fPdg[0]=pdg[0];fPdg[1]=pdg[1]; }
+ void SetMumPdgCodes(Int_t mum[2]) {fMum[0]=mum[0];fMum[1]=mum[1]; }
+ void SetGMumPdgCodes(Int_t gmum[2]) {fGMum[0]=gmum[0];fGMum[1]=gmum[1]; }
+ Double_t TRDTPCCombinedPIDParametrization(Double_t p) const;
+ //
+ private:
+ //
+ Bool_t fSignal; // TRUE if signal, FALSE if background (for simulation)
+ // (background are both combinatorial and primary J/psi)
+ Bool_t fJpsiPrimary; // TRUE if the current candidate is a primary J/psi, FALSE otherway (for simulation)
+ Int_t fEvent; // number of the event this B comes from
+ // -1 if the B comes from ev. mixing
+
+ Int_t fTrkNum[2]; // numbers of the two decay tracks
+
+ Double_t fV1x; // X-position of the primary vertex of the event
+ Double_t fV1y; // Y-position of the primary vertex of the event
+ Double_t fV1z; // Z-position of the primary vertex of the event
+ Double_t fV2x; // X-position of the reconstructed secondary vertex
+ Double_t fV2y; // Y-position of the reconstructed secondary vertex
+ Double_t fV2z; // Z-position of the reconstructed secondary vertex
+ Double_t fDCA; // DCA of the two tracks
+
+ Double_t fPx[2]; // X,Y,Z
+ Double_t fPy[2]; // momenta of the two tracks
+ Double_t fPz[2]; // at the reconstructed vertex
+
+ Double_t fd0[2]; // impact parameters in the bending plane
+
+ Int_t fPdg[2]; // PDG codes of the two tracks (for sim.)
+ Int_t fMum[2]; // PDG codes of the mothers (for sim.)
+ Int_t fGMum[2]; // PDG codes of the grand-mothers (for sim.)
+
+ Double_t fTagEl[2]; // probability to be tagged as electron
+ Double_t fTagPi[2]; // probability to be tagged as pion
+ Double_t fTagKa[2]; // probability to be tagged as kaon
+ Double_t fTagPr[2]; // probability to be tagged as proton
+ Double_t fTagNid[2]; // probability to be tagged as "non-identified"
+
+ Double_t fPIDrespEl[2]; // det. response to be electron
+ Double_t fPIDrespMu[2]; // det. response to be muon
+ Double_t fPIDrespPi[2]; // det. response to be pion
+ Double_t fPIDrespKa[2]; // det. response to be kaon
+ Double_t fPIDrespPr[2]; // det. response to be proton
+ Double_t fTOFmass[2]; // mass estimated by the TOF (-1000. if track not reached TOF)
+ Double_t fWgtJPsi; // weights for the pair
+
+ ClassDef(AliBtoJPSItoEle,1) // Reconstructed B candidate class
+};
+
+#endif
+
+
+
+
+
+
+
+
--- /dev/null
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * *
+ * Author: The ALICE Off-line Project. *
+ * 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. *
+ **************************************************************************/
+
+//----------------------------------------------------------------------------
+// Implementation of the BtoJPSItoEle reconstruction and analysis class
+// Note: the two decay tracks are labelled: 0 (positive track)
+// 1 (negative track)
+// An example of usage can be found in the macro AliBtoJPSItoEleTest.C
+// Origin: G.E. Bruno giuseppe.bruno@ba.infn.it
+// based on Class for charm golden channel (D0->Kpi)
+//----------------------------------------------------------------------------
+#include <TKey.h>
+#include <TFile.h>
+#include <TTree.h>
+#include <TString.h>
+#include <TSystem.h>
+#include <TParticle.h>
+#include "AliESD.h"
+#include "AliMC.h"
+#include "AliRun.h"
+#include "AliRunLoader.h"
+#include "AliVertexerTracks.h"
+#include "AliESDVertex.h"
+#include "AliESDv0.h"
+#include "AliBtoJPSItoEle.h"
+#include "AliBtoJPSItoEleAnalysis.h"
+#include "AliLog.h"
+
+typedef struct {
+ Int_t lab;
+ Int_t pdg;
+ Int_t mumlab;
+ Int_t mumpdg;
+ Int_t gmumlab;
+ Int_t gmumpdg;
+ Int_t mumprongs;
+ Float_t Vx,Vy,Vz;
+ Float_t Px,Py,Pz;
+} REFTRACK;
+
+ClassImp(AliBtoJPSItoEleAnalysis)
+
+//----------------------------------------------------------------------------
+AliBtoJPSItoEleAnalysis::AliBtoJPSItoEleAnalysis() {
+ // Default constructor
+
+ SetPtCut();
+ Setd0Cut();
+ SetPidCut();
+ SetMassCut();
+ SetBCuts();
+ SetVertex1();
+ SetPID();
+ fVertexOnTheFly = kFALSE;
+ fSim = kFALSE;
+ fOnlySignal = kFALSE;
+ fOnlyPrimaryJpsi = kFALSE;
+}
+//----------------------------------------------------------------------------
+AliBtoJPSItoEleAnalysis::~AliBtoJPSItoEleAnalysis() {}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::ApplySelection(const Char_t *inName,const Char_t *outName) const {
+ // select candidates that pass fBCuts and write them to a new file
+
+ TFile *inFile = TFile::Open(inName);
+
+ TTree *treeBin=(TTree*)inFile->Get("TreeB");
+ AliBtoJPSItoEleAnalysis *inAnalysis = (AliBtoJPSItoEleAnalysis*)inFile->Get("BtoJPSItoEleAnalysis");
+ printf("+++\n+++ I N P U T S T A T U S:\n+++\n");
+ inAnalysis->PrintStatus();
+
+
+ AliBtoJPSItoEle *d = 0;
+ treeBin->SetBranchAddress("BtoJPSItoEle",&d);
+ Int_t entries = (Int_t)treeBin->GetEntries();
+
+ printf("+++\n+++ Number of B candidates in input tree: %d\n+++\n",entries);
+
+ TTree *treeBout = new TTree("TreeB","Tree with selected B candidates");
+ treeBout->Branch("BtoJPSItoEle","AliBtoJPSItoEle",&d,200000,0);
+
+
+ Int_t okB=0;
+ Int_t nSel = 0;
+
+ for(Int_t i=0; i<entries; i++) {
+ // get event from tree
+ treeBin->GetEvent(i);
+
+ if(fSim && fOnlySignal && !d->IsSignal()) continue;
+
+ // check if candidate passes selection (as B or Bbar)
+ if(d->Select(fBCuts,okB)) {
+ nSel++;
+ treeBout->Fill();
+ }
+
+ }
+
+ AliBtoJPSItoEleAnalysis *outAnalysis = (AliBtoJPSItoEleAnalysis*)inAnalysis->Clone("BtoJPSItoEleAnalysis");
+ outAnalysis->SetBCuts(fBCuts);
+ printf("------------------------------------------\n");
+ printf("+++\n+++ O U T P U T S T A T U S:\n+++\n");
+ outAnalysis->PrintStatus();
+
+ printf("+++\n+++ Number of B mesons in output tree: %d\n+++\n",nSel);
+
+ TFile* outFile = new TFile(outName,"recreate");
+ treeBout->Write();
+ outAnalysis->Write();
+ outFile->Close();
+
+ return;
+}
+//----------------------------------------------------------------------------
+Double_t AliBtoJPSItoEleAnalysis::CalculateTOFmass(Double_t mom,Double_t length,
+ Double_t time) const {
+ // calculated the mass from momentum, track length from vertex to TOF
+ // and time measured by the TOF
+ if(length==0.) return -1000.;
+ Double_t a = time*time/length/length;
+ if(a > 1.) {
+ a = TMath::Sqrt(a-1.);
+ } else {
+ a = -TMath::Sqrt(1.-a);
+ }
+
+ return mom*a;
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::FindCandidates(Int_t evFirst,Int_t evLast,
+ const Char_t *outName) {
+ // Find candidates and calculate parameters
+
+
+ TString esdName="AliESDs.root";
+ if(gSystem->AccessPathName(esdName.Data(),kFileExists)) {
+ printf("AliBtoJPSItoEleAnalysis::FindCandidatesESD(): No ESDs file found!\n");
+ return;
+ }
+
+ TString outName1=outName;
+ TString outName2="nTotEvents.dat";
+
+ Int_t nTotEv=0,nBrec=0,nBrec1ev=0;
+ Double_t dca;
+ Double_t v2[3],mom[6],d0[2];
+ Int_t iTrkP,iTrkN,trkEntries;
+ Int_t nTrksP=0,nTrksN=0;
+ Int_t trkNum[2];
+ Double_t tofmass[2];
+ Int_t okB=0;
+ AliESDtrack *postrack = 0;
+ AliESDtrack *negtrack = 0;
+
+ // create the AliVertexerTracks object
+ // (it will be used only if fVertexOnTheFly=kTrue)
+ AliVertexerTracks *vertexer1 = new AliVertexerTracks;
+ if(fVertexOnTheFly) {
+ // open the mean vertex
+ TFile *invtx = new TFile("AliESDVertexMean.root");
+ AliESDVertex *initVertex = (AliESDVertex*)invtx->Get("vtxmean");
+ invtx->Close();
+ vertexer1->SetVtxStart(initVertex);
+ delete invtx;
+ }
+ Int_t skipped[2];
+ Bool_t goodVtx1;
+
+ // create tree for reconstructed decayes
+ AliBtoJPSItoEle *ioBtoJPSItoEle=0;
+ TTree *treeB = new TTree("TreeB","Tree with candidates");
+ treeB->Branch("BtoJPSItoEle","AliBtoJPSItoEle",&ioBtoJPSItoEle,200000,0);
+
+ // open file with tracks
+ TFile *esdFile = TFile::Open(esdName.Data());
+ AliESD* event = new AliESD;
+ TTree* tree = (TTree*) esdFile->Get("esdTree");
+ if(!tree) {
+ Error("FindCandidatesESD", "no ESD tree found");
+ return;
+ }
+ tree->SetBranchAddress("ESD",&event);
+
+ // loop on events in file
+ for(Int_t iEvent = evFirst; iEvent < tree->GetEntries(); iEvent++) {
+ if(iEvent > evLast) break;
+ tree->GetEvent(iEvent);
+ Int_t ev = (Int_t)event->GetEventNumberInFile();
+ printf("--- Finding B -> JPSI -> e+ e- in event %d\n",ev);
+ // count the total number of events
+ nTotEv++;
+
+ trkEntries = (Int_t)event->GetNumberOfTracks();
+ printf(" Number of tracks: %d\n",trkEntries);
+ if(trkEntries<2) continue;
+
+ // retrieve primary vertex from file
+ if(!event->GetPrimaryVertex()) {
+ printf(" No vertex\n");
+ continue;
+ }
+ event->GetPrimaryVertex()->GetXYZ(fV1);
+
+ // call function which applies sigle-track selection and
+ // separetes positives and negatives
+ TObjArray trksP(trkEntries/2);
+ Int_t *trkEntryP = new Int_t[trkEntries];
+ TObjArray trksN(trkEntries/2);
+ Int_t *trkEntryN = new Int_t[trkEntries];
+ TTree *trkTree = new TTree();
+ SelectTracks(event,trksP,trkEntryP,nTrksP,
+ trksN,trkEntryN,nTrksN);
+
+ printf(" pos. tracks: %d neg .tracks: %d\n",nTrksP,nTrksN);
+
+
+ nBrec1ev = 0;
+
+ // LOOP ON POSITIVE TRACKS
+ for(iTrkP=0; iTrkP<nTrksP; iTrkP++) {
+ if(iTrkP%1==0) printf(" Processing positive track number %d of %d\n",iTrkP,nTrksP);
+
+ // get track from track array
+ postrack = (AliESDtrack*)trksP.UncheckedAt(iTrkP);
+ trkNum[0] = trkEntryP[iTrkP];
+
+ // LOOP ON NEGATIVE TRACKS
+ for(iTrkN=0; iTrkN<nTrksN; iTrkN++) {
+
+ // get track from tracks array
+ negtrack = (AliESDtrack*)trksN.UncheckedAt(iTrkN);
+ trkNum[1] = trkEntryN[iTrkN];
+
+ //
+ // ----------- DCA MINIMIZATION ------------------
+ //
+ // find the DCA and propagate the tracks to the DCA
+ Double_t b=event->GetMagneticField();
+ AliESDtrack nt(*negtrack), pt(*postrack);
+ dca = nt.PropagateToDCA(&pt,b);
+
+ // define the AliESDv0 object
+ AliESDv0 vertex2(nt,trkNum[0],pt,trkNum[1]);
+
+ // get position of the secondary vertex
+ vertex2.GetXYZ(v2[0],v2[1],v2[2]);
+ vertex2.GetPPxPyPz(mom[0],mom[1],mom[2]);
+ vertex2.GetNPxPyPz(mom[3],mom[4],mom[5]);
+ // impact parameters of the tracks w.r.t. the primary vertex
+ // d0[0] = 10000.*pt.GetD(fV1[0],fV1[1],b);
+ // d0[1] = -10000.*nt.GetD(fV1[0],fV1[1],b);
+ goodVtx1 = kTRUE;
+
+ // no vertexing if DeltaMass > fMassCut
+ if(fVertexOnTheFly) {
+ goodVtx1 = kFALSE;
+ if(SelectInvMass(mom)) {
+ // primary vertex from *other* tracks in the event
+ skipped[0] = trkEntryP[iTrkP];
+ skipped[1] = trkEntryN[iTrkN];
+ vertexer1->SetSkipTracks(2,skipped);
+ AliESDVertex *vertex1onfly =
+ (AliESDVertex*)vertexer1->FindPrimaryVertex(event);
+ if(vertex1onfly->GetNContributors()>0) goodVtx1 = kTRUE;
+ vertex1onfly->GetXYZ(fV1);
+ //vertex1onfly->PrintStatus();
+ delete vertex1onfly;
+ }
+ }
+
+ // impact parameters of the tracks w.r.t. the primary vertex
+ d0[0] = 10000.*pt.GetD(fV1[0],fV1[1],b);
+ d0[1] = -10000.*nt.GetD(fV1[0],fV1[1],b);
+
+ // create the object AliBtoJPSItoEle
+ AliBtoJPSItoEle theB(ev,trkNum,fV1,v2,dca,mom,d0);
+ // select B's
+ if(goodVtx1 && theB.Select(fBCuts,okB)) {
+ // get PID info from ESD
+ AliESDtrack *t0 = (AliESDtrack*)event->GetTrack(trkNum[0]);
+ Double_t esdpid0[5];
+ t0->GetESDpid(esdpid0);
+ if(t0->GetStatus()&AliESDtrack::kTOFpid) {
+ tofmass[0] = CalculateTOFmass(t0->GetP(),
+ t0->GetIntegratedLength(),
+ t0->GetTOFsignal());
+ } else {
+ tofmass[0] = -1000.;
+ }
+ AliESDtrack *t1 = (AliESDtrack*)event->GetTrack(trkNum[1]);
+ Double_t esdpid1[5];
+ t1->GetESDpid(esdpid1);
+ if(t1->GetStatus()&AliESDtrack::kTOFpid) {
+ tofmass[1] = CalculateTOFmass(t1->GetP(),
+ t1->GetIntegratedLength(),
+ t1->GetTOFsignal());
+ } else {
+ tofmass[1] = -1000.;
+ }
+
+ theB.SetPIDresponse(esdpid0,esdpid1);
+ theB.SetTOFmasses(tofmass);
+
+ // fill the tree
+ ioBtoJPSItoEle=&theB;
+ treeB->Fill();
+
+ nBrec++; nBrec1ev++;
+ ioBtoJPSItoEle=0;
+ }
+
+ negtrack = 0;
+ } // loop on negative tracks
+ postrack = 0;
+ } // loop on positive tracks
+
+ delete [] trkEntryP;
+ delete [] trkEntryN;
+ delete trkTree;
+
+ printf(" Number of B candidates: %d\n",nBrec1ev);
+ } // loop on events in file
+
+
+ printf("\n+++\n+++ Total number of events: %d\n+++\n",nTotEv);
+ printf("\n+++\n+++ Total number of B candidates: %d\n+++\n",nBrec);
+
+ delete vertexer1;
+
+ esdFile->Close();
+
+ // create a copy of this class to be written to output file
+ AliBtoJPSItoEleAnalysis *copy = (AliBtoJPSItoEleAnalysis*)this->Clone("BtoJPSItoEleAnalysis");
+
+ // add PDG codes to decay tracks in found candidates (in simulation mode)
+ // and store tree in the output file
+ if(!fSim) {
+ TFile *outroot = new TFile(outName1.Data(),"recreate");
+ treeB->Write();
+ copy->Write();
+ outroot->Close();
+ delete outroot;
+ } else {
+ printf(" Now adding information from simulation (PDG codes) ...\n");
+ TTree *treeBsim = new TTree("TreeB","Tree with B candidates");
+ SimulationInfo(treeB,treeBsim);
+ delete treeB;
+ TFile *outroot = new TFile(outName1.Data(),"recreate");
+ treeBsim->Write();
+ copy->Write();
+ outroot->Close();
+ delete outroot;
+ }
+
+ // write to a file the total number of events
+ FILE *outdat = fopen(outName2.Data(),"w");
+ fprintf(outdat,"%d\n",nTotEv);
+ fclose(outdat);
+
+ return;
+}
+//-----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::PrintStatus() const {
+ // Print parameters being used
+
+ printf("Preselections:\n");
+ printf(" fPtCut = %f GeV\n",fPtCut);
+ printf(" fd0Cut = %f micron\n",fd0Cut);
+ printf(" fMassCut = %f GeV\n",fMassCut);
+ printf(" fPidCut > %f \n",fPidCut);
+ if(fVertexOnTheFly) printf("Primary vertex on the fly\n");
+ if(fSim) {
+ printf("Simulation mode\n");
+ if(fOnlySignal && !(fOnlyPrimaryJpsi)) printf(" Only signal goes to file\n");
+ if(fOnlyPrimaryJpsi && !(fOnlySignal)) printf(" Only primary Jpsi go to file\n");
+ if(fOnlyPrimaryJpsi && fOnlySignal) printf(" Both signal and primary Jpsi go to file\n");
+ }
+ printf("Cuts on candidates:\n");
+ printf(" |M-MJPsi| [GeV] < %f\n",fBCuts[0]);
+ printf(" dca [micron] < %f\n",fBCuts[1]);
+ printf(" cosThetaStar < %f\n",fBCuts[2]);
+ printf(" pTP [GeV] > %f\n",fBCuts[3]);
+ printf(" pTN [GeV] > %f\n",fBCuts[4]);
+ printf(" |d0P| [micron] < %f\n",fBCuts[5]);
+ printf(" |d0N| [micron] < %f\n",fBCuts[6]);
+ printf(" d0d0 [micron^2] < %f\n",fBCuts[7]);
+ printf(" cosThetaPoint > %f\n",fBCuts[8]);
+
+ return;
+}
+//-----------------------------------------------------------------------------
+Bool_t AliBtoJPSItoEleAnalysis::SelectInvMass(const Double_t p[6]) const {
+ // Apply preselection in the invariant mass of the pair
+
+ Double_t mJPsi = 3.096916;
+ Double_t mel = 0.00510998902;
+
+ Double_t energy[2];
+ Double_t mom2[2],momTot2;
+
+ mom2[0] = p[0]*p[0] + p[1]*p[1] + p[2]*p[2];
+ mom2[1] = p[3]*p[3] + p[4]*p[4] + p[5]*p[5];
+
+ momTot2 = (p[0]+p[3])*(p[0]+p[3])+
+ (p[1]+p[4])*(p[1]+p[4])+
+ (p[2]+p[5])*(p[2]+p[5]);
+
+ // J/Psi -> e+ e-
+ energy[1] = TMath::Sqrt(mel*mel+mom2[1]);
+ energy[0] = TMath::Sqrt(mel*mel+mom2[0]);
+
+ Double_t minvJPsi = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-momTot2);
+
+ if(TMath::Abs(minvJPsi-mJPsi) < fMassCut) return kTRUE;
+ return kFALSE;
+}
+//-----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::SelectTracks(AliESD *event,
+ TObjArray &trksP,Int_t *trkEntryP,Int_t &nTrksP,
+ TObjArray &trksN,Int_t *trkEntryN,Int_t &nTrksN) const {
+ // Create two TObjArrays with positive and negative tracks and
+ // apply single-track preselection
+
+ nTrksP=0,nTrksN=0;
+
+ Int_t entr = event->GetNumberOfTracks();
+
+ // transfer ITS tracks from ESD to arrays and to a tree
+ for(Int_t i=0; i<entr; i++) {
+
+ AliESDtrack *esdtrack = event->GetTrack(i);
+ UInt_t status = esdtrack->GetStatus();
+
+ if(!(status&AliESDtrack::kITSin)) continue;
+
+ // single track selection
+ if(!SingleTrkCuts(*esdtrack,event->GetMagneticField())) continue;
+
+ if(esdtrack->GetSign()<0) { // negative track
+ trksN.AddLast(esdtrack);
+ trkEntryN[nTrksN] = i;
+ nTrksN++;
+ } else { // positive track
+ trksP.AddLast(esdtrack);
+ trkEntryP[nTrksP] = i;
+ nTrksP++;
+ }
+
+ } // loop on ESD tracks
+
+ return;
+}
+//-----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::SetBCuts(Double_t cut0,Double_t cut1,
+ Double_t cut2,Double_t cut3,Double_t cut4,
+ Double_t cut5,Double_t cut6,
+ Double_t cut7,Double_t cut8) {
+ // Set the cuts for B selection
+ fBCuts[0] = cut0;
+ fBCuts[1] = cut1;
+ fBCuts[2] = cut2;
+ fBCuts[3] = cut3;
+ fBCuts[4] = cut4;
+ fBCuts[5] = cut5;
+ fBCuts[6] = cut6;
+ fBCuts[7] = cut7;
+ fBCuts[8] = cut8;
+
+ return;
+}
+//-----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::SetBCuts(const Double_t cuts[9]) {
+ // Set the cuts for B selection
+
+ for(Int_t i=0; i<9; i++) fBCuts[i] = cuts[i];
+
+ return;
+}
+//-----------------------------------------------------------------------------
+Bool_t
+AliBtoJPSItoEleAnalysis::SingleTrkCuts(const AliESDtrack& trk, Double_t b) const {
+ // Check if track passes some kinematical cuts
+ // Magnetic field "b" (kG)
+
+ if(TMath::Abs(1./trk.GetParameter()[4]) < fPtCut)
+ return kFALSE;
+ if(TMath::Abs(10000.*trk.GetD(fV1[0],fV1[1],b)) < fd0Cut)
+ return kFALSE;
+ //select only tracks with the "combined PID"
+ UInt_t status = trk.GetStatus();
+ if ((status&AliESDtrack::kESDpid)==0) return kTRUE;
+ Double_t r[5];
+ trk.GetESDpid(r);
+ if(r[0] < fPidCut) return kFALSE;
+
+ return kTRUE;
+}
+//----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::MakeTracksRefFile(AliRun *gAlice,
+ Int_t evFirst,Int_t evLast) const {
+ // Create a file with simulation info for the reconstructed tracks
+
+ TFile *outFile = TFile::Open("BTracksRefFile.root","recreate");
+ TFile *esdFile = TFile::Open("AliESDs.root");
+
+ AliMC *mc = gAlice->GetMCApp();
+
+ Int_t label;
+ TParticle *part;
+ TParticle *mumpart;
+ TParticle *gmumpart;
+ REFTRACK reftrk;
+
+ AliESD* event = new AliESD;
+ TTree* tree = (TTree*) esdFile->Get("esdTree");
+ tree->SetBranchAddress("ESD",&event);
+ // loop on events in file
+ for(Int_t iEvent=evFirst; iEvent<tree->GetEntries(); iEvent++) {
+ if(iEvent>evLast) break;
+ tree->GetEvent(iEvent);
+ Int_t ev = (Int_t)event->GetEventNumberInFile();
+
+ gAlice->GetEvent(ev);
+
+ Int_t nentr=(Int_t)event->GetNumberOfTracks();
+
+ // Tree for true track parameters
+ char ttname[100];
+ sprintf(ttname,"Tree_Ref_%d",ev);
+ TTree *reftree = new TTree(ttname,"Tree with true track params");
+ reftree->Branch("rectracks",&reftrk,"lab/I:pdg:mumlab:mumpdg:gmumlab:gmumpdg:mumprongs:Vx/F:Vy:Vz:Px:Py:Pz");
+// reftree->Branch("rectracks",&reftrk,"lab/I:pdg:mumlab:mumpdg:Vx/F:Vy:Vz:Px:Py:Pz");
+
+ for(Int_t i=0; i<nentr; i++) {
+ AliESDtrack *esdtrack = (AliESDtrack*)event->GetTrack(i);
+ label = TMath::Abs(esdtrack->GetLabel());
+
+ part = (TParticle*)mc->Particle(label);
+ reftrk.lab = label;
+ reftrk.pdg = part->GetPdgCode();
+ reftrk.mumlab = part->GetFirstMother();
+ if(part->GetFirstMother()>=0) {
+ mumpart = (TParticle*)gAlice->GetMCApp()->Particle(part->GetFirstMother());
+ reftrk.mumpdg = mumpart->GetPdgCode();
+ reftrk.mumprongs = mumpart->GetNDaughters();
+ reftrk.gmumlab = mumpart->GetFirstMother();
+ if(mumpart->GetFirstMother()>=0) {
+ gmumpart = (TParticle*)gAlice->GetMCApp()->Particle(mumpart->GetFirstMother());
+ reftrk.gmumpdg = gmumpart->GetPdgCode();
+ }
+ } else {
+ reftrk.mumpdg=-1;
+ reftrk.mumprongs=-1;
+ reftrk.gmumpdg=-1;
+ reftrk.gmumlab=part->GetFirstMother(); // If it hasn't any mother, then it has neither Gmother!
+ // reftrk.gmumlab=-1; // If it hasn't any mother, then it has neither Gmother!
+ }
+ reftrk.Vx = part->Vx();
+ reftrk.Vy = part->Vy();
+ reftrk.Vz = part->Vz();
+ reftrk.Px = part->Px();
+ reftrk.Py = part->Py();
+ reftrk.Pz = part->Pz();
+
+ reftree->Fill();
+
+ } // loop on tracks
+
+ outFile->cd();
+ reftree->Write();
+
+ delete reftree;
+ } // loop on events
+
+ esdFile->Close();
+ outFile->Close();
+
+ return;
+}
+//-----------------------------------------------------------------------------
+void AliBtoJPSItoEleAnalysis::SimulationInfo(TTree *treeBin,TTree *treeBout) const {
+ // add pdg codes to candidate decay tracks (for sim)
+
+ TString refFileName("BTracksRefFile.root");
+ if(fSim && gSystem->AccessPathName(refFileName.Data(),kFileExists)) {
+ printf("AliBtoJPSItoEleAnalysis::SimulationInfo: no reference file found!\n");
+ return;
+ }
+ TFile *refFile = TFile::Open(refFileName.Data());
+
+ Char_t refTreeName[100];
+ Int_t event;
+ Int_t pdg[2],mumpdg[2],mumlab[2],gmumpdg[2],gmumlab[2];
+ REFTRACK reftrk;
+
+ // read-in reference tree for event 0 (the only event for Pb-Pb)
+ sprintf(refTreeName,"Tree_Ref_%d",0);
+ TTree *refTree0 = (TTree*)refFile->Get(refTreeName);
+ refTree0->SetBranchAddress("rectracks",&reftrk);
+
+ AliBtoJPSItoEle *theB = 0;
+ treeBin->SetBranchAddress("BtoJPSItoEle",&theB);
+ treeBout->Branch("BtoJPSItoEle","AliBtoJPSItoEle",&theB,200000,0);
+
+ Int_t entries = (Int_t)treeBin->GetEntries();
+
+ for(Int_t i=0; i<entries; i++) {
+ if(i%100==0) printf(" done %d candidates of %d\n",i,entries);
+
+ treeBin->GetEvent(i);
+ event = theB->EventNo();
+
+ if(event==0) { // always true for Pb-Pb (avoid to read-in tree every time)
+ refTree0->GetEvent(theB->GetTrkNum(0));
+ pdg[0] = reftrk.pdg;
+ mumpdg[0] = reftrk.mumpdg;
+ mumlab[0] = reftrk.mumlab;
+ gmumpdg[0] = reftrk.gmumpdg;
+ gmumlab[0] = reftrk.gmumlab;
+ refTree0->GetEvent(theB->GetTrkNum(1));
+ pdg[1] = reftrk.pdg;
+ mumpdg[1] = reftrk.mumpdg;
+ mumlab[1] = reftrk.mumlab;
+ gmumpdg[1] = reftrk.gmumpdg;
+ gmumlab[1] = reftrk.gmumlab;
+ } else {
+ sprintf(refTreeName,"Tree_Ref_%d",event);
+ TTree *refTree = (TTree*)refFile->Get(refTreeName);
+ refTree->SetBranchAddress("rectracks",&reftrk);
+ refTree->GetEvent(theB->GetTrkNum(0));
+ pdg[0] = reftrk.pdg;
+ mumpdg[0] = reftrk.mumpdg;
+ mumlab[0] = reftrk.mumlab;
+ gmumpdg[0] = reftrk.gmumpdg;
+ gmumlab[0] = reftrk.gmumlab;
+ refTree->GetEvent(theB->GetTrkNum(1));
+ pdg[1] = reftrk.pdg;
+ mumpdg[1] = reftrk.mumpdg;
+ mumlab[1] = reftrk.mumlab;
+ gmumpdg[1] = reftrk.gmumpdg;
+ gmumlab[1] = reftrk.gmumlab;
+ delete refTree;
+ }
+
+ theB->SetPdgCodes(pdg);
+ theB->SetMumPdgCodes(mumpdg);
+ theB->SetGMumPdgCodes(gmumpdg);
+
+ if(gmumpdg[0]==gmumpdg[1] && // Both GrandMothers are of the same sign
+ (TMath::Abs(gmumpdg[0])==521 || TMath::Abs(gmumpdg[0])==511 || // GrandMother Bplus/Bminus or B0/B0bar
+ TMath::Abs(gmumpdg[0])==523 || TMath::Abs(gmumpdg[0])==513 || // B0s/B0sbar
+ TMath::Abs(gmumpdg[0])==515 || TMath::Abs(gmumpdg[0])==525 || //
+ TMath::Abs(gmumpdg[0])==531 || TMath::Abs(gmumpdg[0])==533 || //
+ TMath::Abs(gmumpdg[0])==535 || TMath::Abs(gmumpdg[0])==541 || //
+ TMath::Abs(gmumpdg[0])==543 || TMath::Abs(gmumpdg[0])==545 || //
+ TMath::Abs(gmumpdg[0])==10521 || TMath::Abs(gmumpdg[0])==10511 || // all possible
+ TMath::Abs(gmumpdg[0])==10523 || TMath::Abs(gmumpdg[0])==10513 || // B mesons
+ TMath::Abs(gmumpdg[0])==20523 || TMath::Abs(gmumpdg[0])==20513 || //
+ TMath::Abs(gmumpdg[0])==10531 || TMath::Abs(gmumpdg[0])==10533 || //
+ TMath::Abs(gmumpdg[0])==20533 || TMath::Abs(gmumpdg[0])==10541 || //
+ TMath::Abs(gmumpdg[0])==20543 || TMath::Abs(gmumpdg[0])==10543 || //
+ TMath::Abs(gmumpdg[0])==4122 || TMath::Abs(gmumpdg[0])==4222 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4212 || TMath::Abs(gmumpdg[0])==4112 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4224 || TMath::Abs(gmumpdg[0])==4214 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4114 || TMath::Abs(gmumpdg[0])==4232 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4132 || TMath::Abs(gmumpdg[0])==4322 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4312 || TMath::Abs(gmumpdg[0])==4324 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4314 || TMath::Abs(gmumpdg[0])==4332 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4334 || TMath::Abs(gmumpdg[0])==4412 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4422 || TMath::Abs(gmumpdg[0])==4414 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4424 || TMath::Abs(gmumpdg[0])==4432 || // All possible B baryons
+ TMath::Abs(gmumpdg[0])==4434 || TMath::Abs(gmumpdg[0])==4444 // All possible B baryons
+ ) &&
+ mumpdg[0]==443 && mumpdg[1]== 443 &&
+ mumlab[0]==mumlab[1] &&
+ reftrk.mumprongs==2 &&
+ pdg[0]==-11 && pdg[1]==11
+ ) theB->SetSignal();
+
+ else if ( // here consider the case of primary J/psi
+ gmumlab[0]<0 && gmumlab[1]<0 &&
+ mumpdg[0]==443 && mumpdg[1]== 443 &&
+ mumlab[0]==mumlab[1] &&
+ reftrk.mumprongs==2 &&
+ pdg[0]==-11 && pdg[1]==11
+ ) theB->SetJpsiPrimary();
+
+ // if(!fOnlySignal || theB->IsSignal()) treeBout->Fill();
+
+ // write it out 1) always if you have not asked for onlySignal or OnlyPrimaryJpsi (or both)
+ // or 2) if you have asked for Signal and it is Signal
+ // or 3) if you have asked for Primary Jpsi and it is a Primary Jpsi
+ if ( (!fOnlySignal && !fOnlyPrimaryJpsi) || (fOnlySignal && theB->IsSignal())
+ || (fOnlyPrimaryJpsi && theB->IsJpsiPrimary()) ) treeBout->Fill();
+ }
+
+ delete refTree0;
+
+ refFile->Close();
+
+ return;
+}
+
+
+
+
+
+
--- /dev/null
+#ifndef AliBtoJPSItoEleAnalysis_H
+#define AliBtoJPSItoEleAnalysis_H
+/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * See cxx source for full Copyright notice */
+
+//-------------------------------------------------------------------------
+// Class AliBtoJPSItoEleAnalysis
+// Reconstruction and analysis B -> J/\psi + X
+// |_> e+ e-
+//
+// Origin: G.E Bruno giuseppe.bruno@ba.infn.it
+// based on Class for charm golden channel (D0->Kpi)
+//-------------------------------------------------------------------------
+
+#include <TString.h>
+#include <TNamed.h>
+#include "AliESD.h"
+#include "AliRun.h"
+
+//-----------------------------------------------------------------------------
+class AliBtoJPSItoEleAnalysis : public TNamed {
+ public:
+ //
+ AliBtoJPSItoEleAnalysis();
+ virtual ~AliBtoJPSItoEleAnalysis();
+
+ void ApplySelection(const Char_t *inName="AliBtoJPSItoEle.root",
+ const Char_t *outName="AliBtoJPSItoEle_sele.root") const;
+ void FindCandidates(Int_t evFirst=0,Int_t evLast=0,
+ const Char_t *outName="AliBtoJPSItoEle.root");
+ void MakeTracksRefFile(AliRun *gAlice,Int_t evFirst=0,Int_t evLast=0) const;
+ void PrintStatus() const;
+ void SetVertexOnTheFly() { fVertexOnTheFly=kTRUE; }
+ void SetSimulation() { fSim=kTRUE; }
+ void SetOnlySignal() { fOnlySignal=kTRUE; }
+ void SetOnlyPrimaryJpsi() { fOnlyPrimaryJpsi=kTRUE; }
+ void SetOnlySignalAndPrimaryJpsi() { fOnlySignal=kTRUE; fOnlyPrimaryJpsi=kTRUE; }
+ void SetPtCut(Double_t pt=0.) { fPtCut=pt; }
+ void Setd0Cut(Double_t d0=0.) { fd0Cut=d0; }
+ void SetPidCut(Double_t pid=0.) { fPidCut=pid; }
+ void SetMassCut(Double_t deltaM=1000.) { fMassCut=deltaM; }
+ void SetBCuts(Double_t cut0=1000.,Double_t cut1=100000.,
+ Double_t cut2=1.1,Double_t cut3=0.,Double_t cut4=0.,
+ Double_t cut5=100000.,Double_t cut6=100000.,
+ Double_t cut7=100000000.,Double_t cut8=-1.1);
+ void SetBCuts(const Double_t cuts[9]);
+ void SetPID(const Char_t * pid="TRDTPCparam") { fPID=pid; }
+ //
+ private:
+ //
+ Bool_t fVertexOnTheFly; // flag for primary vertex reco on the fly
+ Bool_t fSim; // flag for the analysis of simulated events
+ Bool_t fOnlySignal; // write to file only signal candidates (for sim)
+ Bool_t fOnlyPrimaryJpsi;// write to file only primary Jpsi candidates (for sim)
+ TString fPID; // PID scheme
+
+ Double_t fV1[3]; // primary vertex position (in cm)
+ Double_t fPtCut; // minimum track pt (in GeV/c)
+ Double_t fd0Cut; // minimum track |rphi impact parameter| (in micron)
+ Double_t fMassCut; // maximum of |InvMass-M(J/Psi)| (in GeV)
+ Double_t fPidCut; // min. pid probability as an electron
+ Double_t fBCuts[9]; // cuts on b candidates (see SetBCuts())
+ // (to be passed to function AliBtoJPSItoEle::Select())
+ // 0 = inv. mass half width [GeV]
+ // 1 = dca [micron]
+ // 2 = cosThetaStar
+ // 3 = pTP [GeV/c] (positron)
+ // 4 = pTN [GeV/c] (electron)
+ // 5 = d0P [micron] upper limit!
+ // 6 = d0N [micron] upper limit!
+ // 7 = d0d0 [micron^2]
+ // 8 = cosThetaPoint
+
+ //
+ Double_t CalculateTOFmass(Double_t mom,Double_t length,Double_t time) const;
+ Bool_t SelectInvMass(const Double_t p[6]) const;
+ void SelectTracks(AliESD *event,
+ TObjArray &trksP,Int_t *trkEntryP,Int_t &nTrksP,
+ TObjArray &trksN,Int_t *trkEntryN,Int_t &nTrksN) const;
+ void SetVertex1(Double_t x=0.,Double_t y=0.,Double_t z=0.)
+ { fV1[0]=x;fV1[1]=y;fV1[2]=z; }
+ void SimulationInfo(TTree *treeBin,TTree *treeBout) const;
+ Bool_t SingleTrkCuts(const AliESDtrack& trk, Double_t b) const;
+ //
+ ClassDef(AliBtoJPSItoEleAnalysis,1) // Reconstruction of B->JPSI-> e+e- candidates class
+};
+
+
+#endif
+
+
+
--- /dev/null
+//--------------------------------------------------------------------------
+// Test macro for reconstruction and analysis of B->J/psi*X
+// |_>e+e-
+//
+// Giuseppe Bruno, giuseppe.bruno@ba.infn.it
+// based on the for charm golden channel (D0->Kpi)
+//--------------------------------------------------------------------------
+
+void AliBtoJPSItoEleReco_all() {
+
+ gSystem->Load("libAOD.so");
+ gSystem->Load("libPWG3base.so");
+
+ //============== R E C O N S T R U C T I O N ==============================
+
+ Int_t evFirst = 0;
+ Int_t evLast = 99;
+
+ // Get field from galice.root
+ if (gAlice) {
+ delete gAlice->GetRunLoader();
+ delete gAlice;
+ gAlice=0;
+ }
+ AliRunLoader *rl = AliRunLoader::Open("galice.root");
+ if (rl == 0x0) {
+ cerr<<"Can not open session"<<endl;
+ return;
+ }
+ Int_t retval = rl->LoadgAlice();
+ if (retval) {
+ cerr<<"LoadgAlice returned error"<<endl;
+ delete rl;
+ return;
+ }
+ gAlice=rl->GetAliRun();
+ AliMagF *fiel = (AliMagF*)gAlice->Field();
+ // Set the conversion constant between curvature and Pt
+ AliTracker::SetFieldMap(fiel,kTRUE);
+
+ AliBtoJPSItoEleAnalysis *analysis = new AliBtoJPSItoEleAnalysis();
+ // set simulation to take info on PDG codes from kine tree
+ analysis->SetSimulation();
+ rl->LoadKinematics();
+ analysis->MakeTracksRefFile(gAlice,evFirst,evLast);
+ // cout << "ci arrivo 2" << endl;
+ //--- set this is you want only signal candidates in output file
+ analysis->SetOnlySignal();
+ //--- set this if you want to compute primary vertex candidate by candidate using
+ // other tracks in the event (for pp, broad interaction region);
+ // it is time-consuming procedure, so it can be done after a
+ // preselection on invariant mass
+ //analysis->SetVertexOnTheFly();
+ //analysis->SetMassCut(0.1); // GeV
+ //--- set single-track preselections
+ analysis->SetPtCut(0.); // GeV
+ analysis->Setd0Cut(0.); // micron
+ //--- set cuts on candidates to be written to file
+ // (see AliBtoJPSItoEleAnalysis.h for a description and for the defaults)
+ //analysis->SetBCuts(0.1,1000.,1.1,0.,0.,10000.,10000.,0.,.5);
+ analysis->SetBCuts();
+
+ //--- check the settings
+ analysis->PrintStatus();
+
+ analysis->FindCandidates(evFirst,evLast,"AliBtoJPSItoEle_all.root");
+ delete analysis;
+
+ return;
+}
+//==========================================================================
+void AliBtoJPSItoEleSele() {
+
+ gSystem->Load("libAOD.so");
+ gSystem->Load("libPWG3base.so");
+
+ //======================== S E L E C T I O N ============================
+
+ AliBtoJPSItoEleAnalysis *analysis = new AliBtoJPSItoEleAnalysis();
+ analysis->SetSimulation();
+ analysis->SetOnlySignal();
+ analysis->SetBCuts(0.1,1000.,1.1,0.,0.,10000.,10000.,0.,.5);
+ analysis->ApplySelection("AliBtoJPSItoEle.root","AliBtoJPSItoEle_sele.root");
+ delete analysis;
+
+ return;
+}
+//==========================================================================
+
+
+
+
+
+
--- /dev/null
+//--------------------------------------------------------------------------
+// Test macro for reconstruction and analysis of Primary J/psi into e+e-
+//
+// Giuseppe Bruno, giuseppe.bruno@ba.infn.it
+// based on the for charm golden channel (D0->Kpi)
+//--------------------------------------------------------------------------
+
+void AliPrimJPSItoEleReco_all() {
+
+ gSystem->Load("libAOD.so");
+ gSystem->Load("libPWG3base.so");
+
+ //============== R E C O N S T R U C T I O N ==============================
+
+ Int_t evFirst = 0;
+ Int_t evLast = 99;
+
+ // Get field from galice.root
+ if (gAlice) {
+ delete gAlice->GetRunLoader();
+ delete gAlice;
+ gAlice=0;
+ }
+ AliRunLoader *rl = AliRunLoader::Open("galice.root");
+ if (rl == 0x0) {
+ cerr<<"Can not open session"<<endl;
+ return;
+ }
+ Int_t retval = rl->LoadgAlice();
+ if (retval) {
+ cerr<<"LoadgAlice returned error"<<endl;
+ delete rl;
+ return;
+ }
+ gAlice=rl->GetAliRun();
+ AliMagF *fiel = (AliMagF*)gAlice->Field();
+ // Set the conversion constant between curvature and Pt
+ AliTracker::SetFieldMap(fiel,kTRUE);
+
+ AliBtoJPSItoEleAnalysis *analysis = new AliBtoJPSItoEleAnalysis();
+ // set simulation to take info on PDG codes from kine tree
+ analysis->SetSimulation();
+ rl->LoadKinematics();
+ analysis->MakeTracksRefFile(gAlice,evFirst,evLast);
+ // cout << "ci arrivo 2" << endl;
+ //--- set this is you want only signal candidates in output file
+ //analysis->SetOnlySignal();
+ analysis->SetOnlyPrimaryJpsi();
+ //analysis->SetOnlySignalAndPrimaryJpsi();
+ //--- set this if you want to compute primary vertex candidate by candidate using
+ // other tracks in the event (for pp, broad interaction region);
+ // it is time-consuming procedure, so it can be done after a
+ // preselection on invariant mass
+ //analysis->SetVertexOnTheFly();
+ //analysis->SetMassCut(0.1); // GeV
+ //--- set single-track preselections
+ analysis->SetPtCut(0.); // GeV
+ analysis->Setd0Cut(0.); // micron
+ //--- set cuts on candidates to be written to file
+ // (see AliBtoJPSItoEleAnalysis.h for a description and for the defaults)
+ //analysis->SetBCuts(0.1,1000.,1.1,0.,0.,10000.,10000.,0.,.5);
+ analysis->SetBCuts();
+
+ //--- check the settings
+ analysis->PrintStatus();
+
+ analysis->FindCandidates(evFirst,evLast,"AliJPSItoEle_all.root");
+ delete analysis;
+
+ return;
+}
+//==========================================================================
+void AliBtoJPSItoEleSele() {
+
+ gSystem->Load("libAOD.so");
+ gSystem->Load("libPWG3base.so");
+
+ //======================== S E L E C T I O N ============================
+
+ AliBtoJPSItoEleAnalysis *analysis = new AliBtoJPSItoEleAnalysis();
+ analysis->SetSimulation();
+ //analysis->SetOnlySignal();
+ analysis->SetOnlyPrimaryJpsi();
+ analysis->SetBCuts(0.1,1000.,1.1,0.,0.,10000.,10000.,0.,.5);
+ analysis->ApplySelection("AliBtoJPSItoEle.root","AliBtoJPSItoEle_sele.root");
+ delete analysis;
+
+ return;
+}
+//==========================================================================
+
+
+
+
+
+
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff