move D0toKpi to PWG3 (Andrea)
authordainese <dainese@f7af4fe6-9843-0410-8265-dc069ae4e863>
Fri, 20 Apr 2007 07:46:41 +0000 (07:46 +0000)
committerdainese <dainese@f7af4fe6-9843-0410-8265-dc069ae4e863>
Fri, 20 Apr 2007 07:46:41 +0000 (07:46 +0000)
PWG3/AliD0toKpi.cxx [new file with mode: 0644]
PWG3/AliD0toKpi.h [new file with mode: 0644]
PWG3/AliD0toKpiAnalysis.cxx [new file with mode: 0644]
PWG3/AliD0toKpiAnalysis.h [new file with mode: 0644]
PWG3/AliD0toKpiPlots.C [new file with mode: 0644]
PWG3/AliD0toKpiTest.C

diff --git a/PWG3/AliD0toKpi.cxx b/PWG3/AliD0toKpi.cxx
new file mode 100644 (file)
index 0000000..31a4c94
--- /dev/null
@@ -0,0 +1,535 @@
+/**************************************************************************
+ * 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 D0toKpi class
+//                  for pp and PbPb interactions
+// Note: the two decay tracks are labelled: 0 (positive track)
+//                                          1 (negative track)
+//            Origin: A. Dainese    andrea.dainese@lnl.infn.it            
+//----------------------------------------------------------------------------
+
+#include <TH1.h>
+#include <TH2.h>
+#include <TCanvas.h>
+#include <TPaveLabel.h>
+#include <TVector3.h>
+
+#include "AliD0toKpi.h"
+
+ClassImp(AliD0toKpi)
+
+//----------------------------------------------------------------------------
+AliD0toKpi::AliD0toKpi() {
+  // Default constructor
+  
+  fSignal = 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;
+
+  fTagPi[0] = 0.;
+  fTagPi[1] = 0.;
+  fTagKa[0] = 0.;
+  fTagKa[1] = 0.;
+  fTagNid[0] = 0.;
+  fTagNid[1] = 0.;
+
+  fWgtAD0=fWgtAD0bar=fWgtBD0=fWgtBD0bar=fWgtCD0=fWgtCD0bar=fWgtDD0=fWgtDD0bar=0;
+
+}
+//----------------------------------------------------------------------------
+AliD0toKpi::AliD0toKpi(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;
+
+  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;
+
+  fTagPi[0]  = 0.;
+  fTagPi[1]  = 0.;
+  fTagKa[0]  = 0.;
+  fTagKa[1]  = 0.;
+  fTagNid[0] = 0.;
+  fTagNid[1] = 0.;
+
+  fWgtAD0=fWgtAD0bar=fWgtBD0=fWgtBD0bar=fWgtCD0=fWgtCD0bar=fWgtDD0=fWgtDD0bar=0;
+}
+//----------------------------------------------------------------------------
+AliD0toKpi::~AliD0toKpi() {}
+//____________________________________________________________________________
+AliD0toKpi::AliD0toKpi( const AliD0toKpi& d0toKpi):TObject(d0toKpi) {
+  // dummy copy constructor
+}
+//----------------------------------------------------------------------------
+void AliD0toKpi::ApplyPID(TString pidScheme) {
+  // Applies particle identification
+
+  if((!pidScheme.CompareTo("TOFparamPbPb") || !pidScheme.CompareTo("TOFparamPP")) && fPdg[0]==0) {
+    printf("AliD0toKpi::ApplyPID :\n Warning: TOF parameterized PID can be used only for simulation!\n"); 
+    return;
+  }
+
+  if(!pidScheme.CompareTo("TOFparamPbPb")) {
+    // tagging of the positive track
+    if(TMath::Abs(fPdg[0])==211 || TMath::Abs(fPdg[0])==13 
+       || TMath::Abs(fPdg[0])==11) { // pion,muon,electron
+      fTagPi[0]  = LinearInterpolation(PChild(0),kPiBinsPbPb,kPiBinWidthPbPb,kPiTagPiPbPb);
+      fTagNid[0] = 1.-fTagPi[0];
+      fTagKa[0]   = 0.;
+      fTagPr[0]   = 0.;
+    } 
+    if(TMath::Abs(fPdg[0])==321) { // kaon
+      fTagKa[0]   = LinearInterpolation(PChild(0),kKBinsPbPb,kKBinWidthPbPb,kKTagKPbPb);
+      fTagNid[0] = LinearInterpolation(PChild(0),kKBinsPbPb,kKBinWidthPbPb,kKTagNidPbPb);
+      if((fTagNid[0]+fTagKa[0])>1.) fTagNid[0] = 1.-fTagKa[0];
+      fTagPi[0] = 1.-fTagNid[0]-fTagKa[0];
+      fTagPr[0] = 0.;
+    } 
+    if(TMath::Abs(fPdg[0])==2212) { // proton
+      fTagPr[0]  = LinearInterpolation(PChild(0),kPBinsPbPb,kPBinWidthPbPb,kPTagPPbPb);
+      fTagNid[0] = LinearInterpolation(PChild(0),kPBinsPbPb,kPBinWidthPbPb,kPTagNidPbPb);
+      if((fTagNid[0]+fTagPr[0])>1.) fTagNid[0] = 1.-fTagPr[0];
+      fTagPi[0] = 1.-fTagNid[0]-fTagPr[0];
+      fTagKa[0]   = 0.;
+    } 
+    // tagging of the negative track
+    if(TMath::Abs(fPdg[1])==211 || TMath::Abs(fPdg[1])==13 
+       || TMath::Abs(fPdg[1])==11) { // pion,muon,electron
+      fTagPi[1]  = LinearInterpolation(PChild(1),kPiBinsPbPb,kPiBinWidthPbPb,kPiTagPiPbPb);
+      fTagNid[1] = 1.-fTagPi[1];
+      fTagKa[1]   = 0.;
+      fTagPr[1]   = 0.;
+    } 
+    if(TMath::Abs(fPdg[1])==321) { // kaon
+      fTagKa[1]   = LinearInterpolation(PChild(1),kKBinsPbPb,kKBinWidthPbPb,kKTagKPbPb);
+      fTagNid[1] = LinearInterpolation(PChild(1),kKBinsPbPb,kKBinWidthPbPb,kKTagNidPbPb);
+      if((fTagNid[1]+fTagKa[1])>1.) fTagNid[1] = 1.-fTagKa[1];
+      fTagPi[1] = 1.-fTagNid[1]-fTagKa[1];
+      fTagPr[1] = 0.;
+    } 
+    if(TMath::Abs(fPdg[1])==2212) { // proton
+      fTagPr[1]  = LinearInterpolation(PChild(1),kPBinsPbPb,kPBinWidthPbPb,kPTagPPbPb);
+      fTagNid[1] = LinearInterpolation(PChild(1),kPBinsPbPb,kPBinWidthPbPb,kPTagNidPbPb);
+      if((fTagNid[1]+fTagPr[1])>1.) fTagNid[1] = 1.-fTagPr[1];
+      fTagPi[1] = 1.-fTagNid[1]-fTagPr[1];
+      fTagKa[1]   = 0.;
+    } 
+  }
+
+
+  if(!pidScheme.CompareTo("TOFparamPP")) {
+    // tagging of the positive track
+    if(TMath::Abs(fPdg[0])==211 || TMath::Abs(fPdg[0])==13 
+       || TMath::Abs(fPdg[0])==11) { // pion,muon,electron
+      fTagPi[0]  = LinearInterpolation(PChild(0),kPiBinsPP,kPiBinWidthPP,kPiTagPiPP);
+      fTagNid[0] = 1.-fTagPi[0];
+      fTagKa[0]   = 0.;
+      fTagPr[0]   = 0.;
+    } 
+    if(TMath::Abs(fPdg[0])==321) { // kaon
+      fTagKa[0]   = LinearInterpolation(PChild(0),kKBinsPP,kKBinWidthPP,kKTagKPP);
+      fTagNid[0] = LinearInterpolation(PChild(0),kKBinsPP,kKBinWidthPP,kKTagNidPP);
+      if((fTagNid[0]+fTagKa[0])>1.) fTagNid[0] = 1.-fTagKa[0];
+      fTagPi[0] = 1.-fTagNid[0]-fTagKa[0];
+      fTagPr[0] = 0.;
+    } 
+    if(TMath::Abs(fPdg[0])==2212) { // proton
+      fTagPr[0]  = LinearInterpolation(PChild(0),kPBinsPP,kPBinWidthPP,kPTagPPP);
+      fTagNid[0] = LinearInterpolation(PChild(0),kPBinsPP,kPBinWidthPP,kPTagNidPP);
+      if((fTagNid[0]+fTagPr[0])>1.) fTagNid[0] = 1.-fTagPr[0];
+      fTagPi[0] = 1.-fTagNid[0]-fTagPr[0];
+      fTagKa[0]   = 0.;
+    } 
+    // tagging of the negative track
+    if(TMath::Abs(fPdg[1])==211 || TMath::Abs(fPdg[1])==13 
+       || TMath::Abs(fPdg[1])==11) { // pion,muon,electron
+      fTagPi[1]  = LinearInterpolation(PChild(1),kPiBinsPP,kPiBinWidthPP,kPiTagPiPP);
+      fTagNid[1] = 1.-fTagPi[1];
+      fTagKa[1]   = 0.;
+      fTagPr[1]   = 0.;
+    } 
+    if(TMath::Abs(fPdg[1])==321) { // kaon
+      fTagKa[1]   = LinearInterpolation(PChild(1),kKBinsPP,kKBinWidthPP,kKTagKPP);
+      fTagNid[1] = LinearInterpolation(PChild(1),kKBinsPP,kKBinWidthPP,kKTagNidPP);
+      if((fTagNid[1]+fTagKa[1])>1.) fTagNid[1] = 1.-fTagKa[1];
+      fTagPi[1] = 1.-fTagNid[1]-fTagKa[1];
+      fTagPr[1] = 0.;
+    } 
+    if(TMath::Abs(fPdg[1])==2212) { // proton
+      fTagPr[1]  = LinearInterpolation(PChild(1),kPBinsPP,kPBinWidthPP,kPTagPPP);
+      fTagNid[1] = LinearInterpolation(PChild(1),kPBinsPP,kPBinWidthPP,kPTagNidPP);
+      if((fTagNid[1]+fTagPr[1])>1.) fTagNid[1] = 1.-fTagPr[1];
+      fTagPi[1] = 1.-fTagNid[1]-fTagPr[1];
+      fTagKa[1]   = 0.;
+    } 
+  }
+
+  return;
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::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 AliD0toKpi::ComputeWgts() {
+  // calculate the weights for PID
+
+
+  // assignement of the weights from PID
+  fWgtAD0    = fTagKa[1]*(fTagPi[0]+fTagNid[0]);
+  fWgtAD0bar = fTagKa[0]*(fTagPi[1]+fTagNid[1]);
+  fWgtBD0    = fTagPi[0]*fTagNid[1];
+  fWgtBD0bar = fTagPi[1]*fTagNid[0];
+  fWgtCD0    = fTagNid[0]*fTagNid[1];
+  fWgtCD0bar = fTagNid[0]*fTagNid[1];
+  fWgtDD0    = 1.-fWgtAD0-fWgtBD0-fWgtCD0;
+  fWgtDD0bar = 1.-fWgtAD0bar-fWgtBD0bar-fWgtCD0bar;
+
+  /*  
+  cerr<<fWgtAD0<<"  "<<fWgtAD0bar<<endl;
+  cerr<<fWgtBD0<<"  "<<fWgtBD0bar<<endl;
+  cerr<<fWgtCD0<<"  "<<fWgtCD0bar<<endl;
+  cerr<<fWgtDD0<<"  "<<fWgtDD0bar<<endl;
+  */
+  /*
+  if(fWgtAD0<0.) cerr<<"AliD0toKpi::ComputeWgts()  Negative weight!!!\n";
+  if(fWgtAD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts()  Negative weight!!!\n";
+  if(fWgtBD0<0.) cerr<<"AliD0toKpi::ComputeWgts()  Negative weight!!!\n";
+  if(fWgtBD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts()  Negative weight!!!\n";
+  if(fWgtCD0<0.) cerr<<"AliD0toKpi::ComputeWgts()  Negative weight!!!\n";
+  if(fWgtCD0bar<0.) cerr<<"AliD0toKpi::ComputeWgts()  Negative weight!!!\n";
+  */
+
+  return;
+}
+//----------------------------------------------------------------------------
+void AliD0toKpi::CorrectWgt4BR(Double_t factor) {
+  // correct weights of background from charm 
+
+  fWgtAD0    *= factor;
+  fWgtAD0bar *= factor;
+  fWgtBD0    *= factor;
+  fWgtBD0bar *= factor;
+  fWgtCD0    *= factor;
+  fWgtCD0bar *= factor;
+  fWgtDD0    *= factor;
+  fWgtDD0bar *= factor;
+
+  return;
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::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 AliD0toKpi::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 AliD0toKpi::CosThetaStar(Double_t &ctsD0,Double_t &ctsD0bar) const {
+  // cosine of decay angle in the D0 rest frame
+
+  Double_t pStar = TMath::Sqrt(TMath::Power(kMD0*kMD0-kMK*kMK-kMPi*kMPi,2.)-4.*kMK*kMK*kMPi*kMPi)/(2.*kMD0);
+
+  Double_t beta = P()/Energy();
+  Double_t gamma = Energy()/kMD0;
+
+  ctsD0 = (Ql(1)/gamma-beta*TMath::Sqrt(pStar*pStar+kMK*kMK))/pStar;
+  // if(ctsD0 > 1.)  { cerr<<"AliD0toKpi::CosThetaStar: > 1 "<<ctsD0<<"!\n"; }
+  // if(ctsD0 < -1.) { cerr<<"AliD0toKpi::CosThetaStar: < -1 "<<ctsD0<<"!\n"; }
+
+  ctsD0bar = (Ql(0)/gamma-beta*TMath::Sqrt(pStar*pStar+kMK*kMK))/pStar;
+  // if(ctsD0bar > 1.)  { cerr<<"AliD0toKpi::CosThetaStar: > 1 "<<ctsD0bar<<"!\n"; }
+  // if(ctsD0bar < -1.) { cerr<<"AliD0toKpi::CosThetaStar: < -1 "<<ctsD0bar<<"!\n";} 
+
+  return;
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::Eta() const {
+  // pseudorapidity of the D0
+
+  Double_t theta = TMath::Pi()/2.-TMath::ATan2(Pz(),Pt());
+  Double_t eta = -TMath::Log(TMath::Tan(theta/2.));
+  return eta;
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::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 AliD0toKpi::GetWgts(Double_t &WgtD0,Double_t &WgtD0bar,TString sample) 
+  const {
+  // returns the weights for pid
+
+  if(!sample.CompareTo("A")) { WgtD0 = fWgtAD0;  WgtD0bar = fWgtAD0bar; }
+  if(!sample.CompareTo("B")) { WgtD0 = fWgtBD0;  WgtD0bar = fWgtBD0bar; }
+  if(!sample.CompareTo("C")) { WgtD0 = fWgtCD0;  WgtD0bar = fWgtCD0bar; }
+  if(!sample.CompareTo("D")) { WgtD0 = fWgtDD0;  WgtD0bar = fWgtDD0bar; }
+  if(!sample.CompareTo("ABCD")) { 
+    WgtD0    = fWgtAD0+fWgtBD0+fWgtCD0+fWgtDD0; 
+    WgtD0bar = fWgtAD0bar+fWgtBD0bar+fWgtCD0bar+fWgtDD0bar; 
+  }
+  if(!sample.CompareTo("ABC")) { 
+    WgtD0    = fWgtAD0+fWgtBD0+fWgtCD0; 
+    WgtD0bar = fWgtAD0bar+fWgtBD0bar+fWgtCD0bar; 
+  }
+  if(!sample.CompareTo("BC")) { 
+    WgtD0    = fWgtBD0+fWgtCD0; 
+    WgtD0bar = fWgtBD0bar+fWgtCD0bar; 
+  }
+
+  return;
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::ImpPar() const {
+  // D0 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 AliD0toKpi::InvMass(Double_t &mD0,Double_t &mD0bar) const {
+  // invariant mass as D0 and as D0bar
+
+  Double_t energy[2];
+
+  // D0 -> K- Pi+
+  energy[1] = TMath::Sqrt(kMK*kMK+PChild(1)*PChild(1));
+  energy[0] = TMath::Sqrt(kMPi*kMPi+PChild(0)*PChild(0));
+
+  mD0 = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-P()*P());
+    
+
+  // D0bar -> K+ Pi-
+  energy[0] = TMath::Sqrt(kMK*kMK+PChild(0)*PChild(0));
+  energy[1] = TMath::Sqrt(kMPi*kMPi+PChild(1)*PChild(1));
+
+  mD0bar = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-P()*P());
+    
+  return;
+
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::Ql(Int_t child) const {
+  // longitudinal momentum of decay tracks w.r.t. to D0 momentum
+
+  Double_t qL;
+  TVector3 mom(fPx[child],fPy[child],fPz[child]);
+  TVector3 momD(Px(),Py(),Pz());
+
+  qL = mom.Dot(momD)/momD.Mag();
+
+  return qL ;
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::Qt() const {
+  // transverse momentum of decay tracks w.r.t. to D0 momentum  
+
+  TVector3 mom0(fPx[0],fPy[0],fPz[0]);
+  TVector3 momD(Px(),Py(),Pz());
+
+  return mom0.Perp(momD);
+}
+//----------------------------------------------------------------------------
+Bool_t AliD0toKpi::Select(const Double_t* cuts,Int_t& okD0,Int_t& okD0bar) 
+  const {
+//
+// This function compares the D0 with a set of cuts:
+//
+// cuts[0] = inv. mass half width [GeV]   
+// cuts[1] = dca [micron]
+// cuts[2] = cosThetaStar 
+// cuts[3] = pTK [GeV/c]
+// cuts[4] = pTPi [GeV/c]
+// cuts[5] = d0K [micron]   upper limit!
+// cuts[6] = d0Pi [micron]  upper limit!
+// cuts[7] = d0d0 [micron^2]
+// cuts[8] = cosThetaPoint
+//
+// If the D0/D0bar doesn't pass the cuts it sets the weights to 0
+// If neither D0 nor D0bar pass the cuts return kFALSE
+//
+  Double_t mD0,mD0bar,ctsD0,ctsD0bar;
+  okD0=1; okD0bar=1;
+
+  if(PtChild(1) < cuts[3] || PtChild(0) < cuts[4]) okD0 = 0;
+  if(PtChild(0) < cuts[3] || PtChild(1) < cuts[4]) okD0bar = 0;
+  if(!okD0 && !okD0bar) return kFALSE;
+
+  if(TMath::Abs(Getd0Child(1)) > cuts[5] || 
+     TMath::Abs(Getd0Child(0)) > cuts[6]) okD0 = 0;
+  if(TMath::Abs(Getd0Child(0)) > cuts[6] ||
+     TMath::Abs(Getd0Child(1)) > cuts[5]) okD0bar = 0;
+  if(!okD0 && !okD0bar) return kFALSE;
+
+  if(GetDCA() > cuts[1]) { okD0 = okD0bar = 0; return kFALSE; }
+
+  InvMass(mD0,mD0bar);
+  if(TMath::Abs(mD0-kMD0)    > cuts[0]) okD0 = 0;
+  if(TMath::Abs(mD0bar-kMD0) > cuts[0]) okD0bar = 0;
+  if(!okD0 && !okD0bar) return kFALSE;
+
+  CosThetaStar(ctsD0,ctsD0bar);
+  if(TMath::Abs(ctsD0)    > cuts[2]) okD0 = 0;
+  if(TMath::Abs(ctsD0bar) > cuts[2]) okD0bar = 0;
+  if(!okD0 && !okD0bar) return kFALSE;
+
+  if(ProdImpParams() > cuts[7]) { okD0 = okD0bar = 0; return kFALSE; }
+
+  if(CosPointing()   < cuts[8]) { okD0 = okD0bar = 0; return kFALSE; }
+
+  return kTRUE;
+}
+//-----------------------------------------------------------------------------
+void AliD0toKpi::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;
+} 
+//----------------------------------------------------------------------------
+Double_t AliD0toKpi::LinearInterpolation(Double_t p,Int_t nBins,Double_t Bin,
+                                        const Double_t *values) const {
+  // a linear interpolation method
+
+  Double_t value=0; 
+  Double_t slope;
+
+  if(p<0.5*Bin) {
+    value = values[0];
+  } else if(p>=(nBins-0.5)*Bin) {
+    slope = (2*values[nBins-1]-values[nBins-2]-values[nBins-3])/Bin/2;
+    value = values[nBins-2]+slope*(p-Bin*(nBins-1.5));
+  } else {
+    for(Int_t i=0; i<nBins; i++) {
+      if(p<(i+0.5)*Bin) {
+       slope = (values[i]-values[i-1])/Bin;
+       value = values[i-1]+slope*(p-Bin*(i-0.5));
+       break;
+      }
+    }
+  }
+
+  if(value<0.) value=0.;
+  if(value>1.) value=1.;
+
+  return value;
+}
+//----------------------------------------------------------------------------
+
+
+
+
+
+
+
+
+
diff --git a/PWG3/AliD0toKpi.h b/PWG3/AliD0toKpi.h
new file mode 100644 (file)
index 0000000..716dbb9
--- /dev/null
@@ -0,0 +1,195 @@
+#ifndef AliD0toKpi_H
+#define AliD0toKpi_H
+/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * See cxx source for full Copyright notice                               */
+
+//-------------------------------------------------------------------------
+//                          Class AliD0toKpi
+//                 Reconstructed D0 -> K^- pi^+ class
+//      
+// Note: the two decay tracks are labelled: 0 (positive track)
+//                                          1 (negative track)
+//
+//         Origin: A. Dainese    andrea.dainese@lnl.infn.it                  
+//-------------------------------------------------------------------------
+
+#include <TObject.h>
+#include <TMath.h>
+
+//----------------------------------------------------------------------------
+//     Some constants (masses + parameterized TOF PID)
+//
+// particle masses
+const Double_t kMD0 = 1.8645;  // D0  mass
+const Double_t kMK  = 0.49368; // K+  mass
+const Double_t kMPi = 0.13957; // pi+ mass
+
+//  --- TOF tagging probabilities --- 
+//  central HIJING
+//  B = 0.4 T
+//  tracking errors in TPC included
+//  With TRD
+//
+//  *** Pb-Pb dNch/dy=6000 *** 
+//
+//  PIONS
+const Int_t kPiBinsPbPb = 10;
+const Double_t kPiBinWidthPbPb = 0.250;
+const Double_t kPiTagPiPbPb[kPiBinsPbPb] = {0.211421,0.652184,0.624421,0.614727,0.610777,0.628015,0.631520,0.630324,0.637551,0.575235};
+const Double_t kPiTagNidPbPb[kPiBinsPbPb] = {0.788579,0.347816,0.375579,0.385273,0.389223,0.371985,0.368480,0.369676,0.362449,0.424765};
+//  KAONS
+const Int_t kKBinsPbPb = 10;
+const Double_t kKBinWidthPbPb = 0.250;
+const Double_t kKTagKPbPb[kKBinsPbPb] = {0.000000,0.101255,0.397662,0.467586,0.517008,0.555023,0.584185,0.519029,0.464117,0.247308};
+const Double_t kKTagPiPbPb[kKBinsPbPb] = {0.102049,0.289930,0.101930,0.057771,0.040286,0.028567,0.053108,0.094369,0.066302,0.247308};
+const Double_t kKTagNidPbPb[kKBinsPbPb] = {0.897951,0.608815,0.500408,0.474643,0.442705,0.416410,0.362707,0.386603,0.469580,0.505383};
+//  PROTONS
+const Int_t kPBinsPbPb = 9;
+const Double_t kPBinWidthPbPb = 0.500;
+const Double_t kPTagPPbPb[kPBinsPbPb] = {0.017940,0.350681,0.535286,0.583264,0.562935,0.560524,0.545992,0.598060,0.351245};
+const Double_t kPTagPiPbPb[kPBinsPbPb] = {0.195955,0.094949,0.039962,0.026039,0.007556,0.016986,0.030333,0.000000,0.000000};
+const Double_t kPTagNidPbPb[kPBinsPbPb] = {0.786105,0.554370,0.424751,0.390697,0.429508,0.422491,0.423675,0.401940,0.648755};
+//
+// pp PYTHIA 
+//
+// *** cuts for pp ***
+//
+//  PIONS
+const Int_t kPiBinsPP = 10;
+const Double_t kPiBinWidthPP = 0.250;
+const Double_t kPiTagPiPP[kPiBinsPP] = {0.194528,0.447097,0.603364,0.646413,0.647125,0.669157,0.688139,0.682564,0.689910,0.665710};
+const Double_t kPiTagNidPP[kPiBinsPP] = {0.805472,0.552903,0.396636,0.353587,0.352875,0.330843,0.311861,0.317436,0.310090,0.334290};
+//  KAONS
+const Int_t kKBinsPP = 10;
+const Double_t kKBinWidthPP = 0.250;
+const Double_t kKTagKPP[kKBinsPP] = {0.000000,0.173393,0.439690,0.519423,0.587025,0.605372,0.586021,0.650139,0.444444,0.299363};
+const Double_t kKTagPiPP[kKBinsPP] = {0.000000,0.001495,0.000000,-0.000000,-0.000000,0.000000,0.032258,0.060572,0.101449,0.242038};
+const Double_t kKTagNidPP[kKBinsPP] = {1.000000,0.825112,0.560310,0.480577,0.412975,0.394628,0.381720,0.289289,0.454106,0.458599};
+//  PROTONS
+const Int_t kPBinsPP = 9;
+const Double_t kPBinWidthPP = 0.500;
+const Double_t kPTagPPP[kPBinsPP] = {0.029404,0.438640,0.613710,0.665152,0.634961,0.657711,0.703704,0.685714,0.235294};
+const Double_t kPTagPiPP[kPBinsPP] = {0.000000,0.000000,0.000000,-0.000000,0.000000,0.000000,-0.000000,0.014286,-0.000000};
+const Double_t kPTagNidPP[kPBinsPP] = {0.970596,0.561360,0.386290,0.334848,0.365039,0.342289,0.296296,0.300000,0.764706};
+
+
+
+
+//-----------------------------------------------------------------------------
+class AliD0toKpi : public TObject {
+ public:
+  //
+  AliD0toKpi();
+  AliD0toKpi(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 ~AliD0toKpi();
+  AliD0toKpi(const AliD0toKpi& d0toKpi);
+
+  Double_t Alpha() const { return (Ql(0)-Ql(1))/(Ql(0)+Ql(1)); }
+  void     ApplyPID(TString pidScheme="TOFparamPbPb");
+  Double_t ChildrenRelAngle() const; 
+  void     ComputeWgts();
+  void     CorrectWgt4BR(Double_t factor);
+  Double_t CosPointing() const;
+  Double_t CosPointingXY() const;
+  void     CosThetaStar(Double_t &ctsD0,Double_t &ctsD0bar) const;
+  Double_t Ct() const {return Length()*kMD0/P();}
+  Double_t Energy() const { return TMath::Sqrt(P()*P()+kMD0*kMD0); }
+  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]; }
+  void     GetWgts(Double_t &WgtD0,Double_t &WgtD0bar,TString sample) 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 &mD0,Double_t &mD0bar) const;
+  Bool_t   IsSignal() const { if(fSignal) 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& okD0,Int_t& okD0bar) const;
+  void     SetPrimaryVtx(Double_t vtx[3]) 
+    { fV1x=vtx[0]; fV1y=vtx[1]; fV1z=vtx[2]; }
+  void     SetSignal() { fSignal =  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]; }
+  Double_t LinearInterpolation(Double_t p,Int_t nBins,Double_t Bin,
+                              const Double_t *values) const;
+  //
+ private:
+  //
+  Bool_t   fSignal; // TRUE if signal, FALSE if background (for simulation)
+  Int_t    fEvent;  // number of the event this D0 comes from
+                    // -1 if the D0 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.)
+
+  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 fWgtAD0,fWgtAD0bar; // weights for the 3 samples
+  Double_t fWgtBD0,fWgtBD0bar; // weights for the 3 samples 
+  Double_t fWgtCD0,fWgtCD0bar; // A: (K,Pi)+(K,?) B: (?,Pi) C: (?,?)
+  Double_t fWgtDD0,fWgtDD0bar; // D: all other pairs
+
+  ClassDef(AliD0toKpi,1)  // Reconstructed D0 candidate class
+};
+
+#endif
+
+
+
+
+
+
+
+
diff --git a/PWG3/AliD0toKpiAnalysis.cxx b/PWG3/AliD0toKpiAnalysis.cxx
new file mode 100644 (file)
index 0000000..e9294d2
--- /dev/null
@@ -0,0 +1,657 @@
+/**************************************************************************
+ * 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 D0toKpi 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 AliD0toKpiTest.C
+//            Origin: A. Dainese    andrea.dainese@lnl.infn.it            
+//----------------------------------------------------------------------------
+#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 "AliD0toKpi.h"
+#include "AliD0toKpiAnalysis.h"
+#include "AliLog.h"
+
+typedef struct {
+  Int_t lab;
+  Int_t pdg;
+  Int_t mumlab;
+  Int_t mumpdg;
+  Int_t mumprongs;
+  Float_t Vx,Vy,Vz;
+  Float_t Px,Py,Pz;
+} REFTRACK;
+
+ClassImp(AliD0toKpiAnalysis)
+
+//----------------------------------------------------------------------------
+AliD0toKpiAnalysis::AliD0toKpiAnalysis() {
+  // Default constructor
+
+  SetPtCut();
+  Setd0Cut();
+  SetMassCut();
+  SetD0Cuts();
+  SetVertex1();
+  SetPID();
+  fVertexOnTheFly = kFALSE;
+  fSim = kFALSE;
+  fOnlySignal = kFALSE;
+}
+//----------------------------------------------------------------------------
+AliD0toKpiAnalysis::~AliD0toKpiAnalysis() {}
+//----------------------------------------------------------------------------
+void AliD0toKpiAnalysis::ApplySelection(const Char_t *inName,const Char_t *outName) const {
+  // select candidates that pass fD0Cuts and write them to a new file
+
+  TFile *inFile = TFile::Open(inName);
+
+  TTree *treeD0in=(TTree*)inFile->Get("TreeD0");
+  AliD0toKpiAnalysis *inAnalysis = (AliD0toKpiAnalysis*)inFile->Get("D0toKpiAnalysis");
+  printf("+++\n+++  I N P U T   S T A T U S:\n+++\n");
+  inAnalysis->PrintStatus();
+
+
+  AliD0toKpi *d = 0; 
+  treeD0in->SetBranchAddress("D0toKpi",&d);
+  Int_t entries = (Int_t)treeD0in->GetEntries();
+
+  printf("+++\n+++ Number of D0 in input tree:  %d\n+++\n",entries);
+
+  TTree *treeD0out = new TTree("TreeD0","Tree with selected D0 candidates");
+  treeD0out->Branch("D0toKpi","AliD0toKpi",&d,200000,0);
+
+
+  Int_t okD0=0,okD0bar=0;
+  Int_t nSel = 0;
+
+  for(Int_t i=0; i<entries; i++) {
+    // get event from tree
+    treeD0in->GetEvent(i);
+
+    if(fSim && fOnlySignal && !d->IsSignal()) continue; 
+
+    // check if candidate passes selection (as D0 or D0bar)
+    if(d->Select(fD0Cuts,okD0,okD0bar)) {
+      nSel++;
+      treeD0out->Fill();
+    }
+
+  }
+
+  AliD0toKpiAnalysis *outAnalysis = (AliD0toKpiAnalysis*)inAnalysis->Clone("D0toKpiAnalysis");
+  outAnalysis->SetD0Cuts(fD0Cuts);
+  printf("------------------------------------------\n");
+  printf("+++\n+++  O U T P U T   S T A T U S:\n+++\n");
+  outAnalysis->PrintStatus();
+
+  printf("+++\n+++ Number of D0 in output tree:  %d\n+++\n",nSel);
+
+  TFile* outFile = new TFile(outName,"recreate");
+  treeD0out->Write();
+  outAnalysis->Write();
+  outFile->Close();
+
+  return;
+}
+//----------------------------------------------------------------------------
+Double_t AliD0toKpiAnalysis::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 AliD0toKpiAnalysis::FindCandidates(Int_t evFirst,Int_t evLast,
+                                       const Char_t *outName) {
+  // Find D0 candidates and calculate parameters
+
+
+  TString esdName="AliESDs.root";
+  if(gSystem->AccessPathName(esdName.Data(),kFileExists)) {
+    printf("AliD0toKpiAnalysis::FindCandidatesESD(): No ESDs file found!\n"); 
+    return;
+  }
+
+  TString outName1=outName;
+  TString outName2="nTotEvents.dat";
+
+  Int_t    nTotEv=0,nD0rec=0,nD0rec1ev=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    okD0=0,okD0bar=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 D0s
+  AliD0toKpi *ioD0toKpi=0;
+  TTree *treeD0 = new TTree("TreeD0","Tree with D0 candidates");
+  treeD0->Branch("D0toKpi","AliD0toKpi",&ioD0toKpi,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(); // This is most likely NOT the event number you'd like to use. It has nothing to do with the 'real' event number.
+    printf("--- Finding D0 -> Kpi 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);
+
+
+    nD0rec1ev = 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;        
+         }
+       }
+       
+
+       // create the object AliD0toKpi
+       AliD0toKpi theD0(ev,trkNum,fV1,v2,dca,mom,d0);
+       // select D0s
+       if(goodVtx1 && theD0.Select(fD0Cuts,okD0,okD0bar)) {
+         // 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.;
+         }
+
+         theD0.SetPIDresponse(esdpid0,esdpid1);
+         theD0.SetTOFmasses(tofmass);
+
+         // fill the tree
+         ioD0toKpi=&theD0;
+         treeD0->Fill();
+
+         nD0rec++; nD0rec1ev++;
+         ioD0toKpi=0;  
+       }
+       
+       negtrack = 0;
+      } // loop on negative tracks
+      postrack = 0;
+    }   // loop on positive tracks
+    
+    delete [] trkEntryP;
+    delete [] trkEntryN;
+    delete trkTree;
+
+    printf(" Number of D0 candidates: %d\n",nD0rec1ev);
+  }    // loop on events in file
+
+
+  printf("\n+++\n+++ Total number of events: %d\n+++\n",nTotEv);
+  printf("\n+++\n+++ Total number of D0 candidates: %d\n+++\n",nD0rec);
+
+  delete vertexer1;
+
+  esdFile->Close();
+
+  // create a copy of this class to be written to output file
+  AliD0toKpiAnalysis *copy = (AliD0toKpiAnalysis*)this->Clone("D0toKpiAnalysis");
+
+  // 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");
+    treeD0->Write();
+    copy->Write();
+    outroot->Close();
+    delete outroot;
+  } else {
+    printf(" Now adding information from simulation (PDG codes) ...\n");
+    TTree *treeD0sim = new TTree("TreeD0","Tree with D0 candidates");
+    SimulationInfo(treeD0,treeD0sim);
+    delete treeD0;
+    TFile *outroot = new TFile(outName1.Data(),"recreate");
+    treeD0sim->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 AliD0toKpiAnalysis::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);
+  if(fVertexOnTheFly) printf("Primary vertex on the fly\n");
+  if(fSim) { 
+    printf("Simulation mode\n");
+    if(fOnlySignal) printf("  Only signal goes to file\n");
+  }
+  printf("Cuts on candidates:\n");
+  printf("    |M-MD0| [GeV]    < %f\n",fD0Cuts[0]);
+  printf("    dca    [micron]  < %f\n",fD0Cuts[1]);
+  printf("    cosThetaStar     < %f\n",fD0Cuts[2]);
+  printf("    pTK     [GeV]    > %f\n",fD0Cuts[3]);
+  printf("    pTpi    [GeV]    > %f\n",fD0Cuts[4]);
+  printf("    |d0K|  [micron]  < %f\n",fD0Cuts[5]);
+  printf("    |d0pi| [micron]  < %f\n",fD0Cuts[6]);
+  printf("    d0d0  [micron^2] < %f\n",fD0Cuts[7]);
+  printf("    cosThetaPoint    > %f\n",fD0Cuts[8]);
+
+  return;
+}
+//-----------------------------------------------------------------------------
+Bool_t AliD0toKpiAnalysis::SelectInvMass(const Double_t p[6]) const {
+  // Apply preselection in the invariant mass of the pair
+
+  Double_t mD0 = 1.8645;
+  Double_t mPi = 0.13957;
+  Double_t mKa = 0.49368;
+
+  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]);
+
+  // D0 -> K- pi+
+  energy[1] = TMath::Sqrt(mKa*mKa+mom2[1]);
+  energy[0] = TMath::Sqrt(mPi*mPi+mom2[0]);
+
+  Double_t minvD0 = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-momTot2);
+    
+  // D0bar -> K+ pi-
+  energy[0] = TMath::Sqrt(mKa*mKa+mom2[0]);
+  energy[1] = TMath::Sqrt(mPi*mPi+mom2[1]);
+
+  Double_t minvD0bar = TMath::Sqrt((energy[0]+energy[1])*(energy[0]+energy[1])-momTot2);
+
+  if(TMath::Abs(minvD0-mD0)    < fMassCut) return kTRUE;
+  if(TMath::Abs(minvD0bar-mD0) < fMassCut) return kTRUE;
+  return kFALSE;
+}
+//-----------------------------------------------------------------------------
+void AliD0toKpiAnalysis::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 AliD0toKpiAnalysis::SetD0Cuts(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 D0 selection
+  fD0Cuts[0] = cut0;
+  fD0Cuts[1] = cut1;
+  fD0Cuts[2] = cut2;
+  fD0Cuts[3] = cut3;
+  fD0Cuts[4] = cut4;
+  fD0Cuts[5] = cut5;
+  fD0Cuts[6] = cut6;
+  fD0Cuts[7] = cut7;
+  fD0Cuts[8] = cut8;
+
+  return;
+}
+//-----------------------------------------------------------------------------
+void AliD0toKpiAnalysis::SetD0Cuts(const Double_t cuts[9]) {
+  // Set the cuts for D0 selection
+
+  for(Int_t i=0; i<9; i++) fD0Cuts[i] = cuts[i];
+
+  return;
+}
+//-----------------------------------------------------------------------------
+Bool_t 
+AliD0toKpiAnalysis::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;
+
+  return kTRUE;
+}
+//----------------------------------------------------------------------------
+void AliD0toKpiAnalysis::MakeTracksRefFile(AliRun *gAlice,
+                                          Int_t evFirst,Int_t evLast) const {
+  // Create a file with simulation info for the reconstructed tracks
+  
+  TFile *outFile = TFile::Open("D0TracksRefFile.root","recreate");
+  TFile *esdFile = TFile::Open("AliESDs.root");
+
+  AliMC *mc = gAlice->GetMCApp();
+  
+  Int_t      label;
+  TParticle *part;  
+  TParticle *mumpart;
+  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(); // This is most likely NOT the event number you'd like to use. It has nothing to do with the 'real' event number.
+
+    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: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();
+      } else {
+       reftrk.mumpdg=-1;
+       reftrk.mumprongs=-1;
+      }
+      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 AliD0toKpiAnalysis::SimulationInfo(TTree *treeD0in,TTree *treeD0out) const {
+  // add pdg codes to candidate decay tracks (for sim)
+
+  TString refFileName("D0TracksRefFile.root");
+  if(fSim && gSystem->AccessPathName(refFileName.Data(),kFileExists)) { 
+    printf("AliD0toKpiAnalysis::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];
+  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);
+
+  AliD0toKpi *theD0 = 0; 
+  treeD0in->SetBranchAddress("D0toKpi",&theD0);
+  treeD0out->Branch("D0toKpi","AliD0toKpi",&theD0,200000,0);
+
+  Int_t entries = (Int_t)treeD0in->GetEntries();
+
+  for(Int_t i=0; i<entries; i++) {
+    if(i%100==0) printf("  done %d candidates of %d\n",i,entries);    
+
+    treeD0in->GetEvent(i);
+    event = theD0->EventNo();
+
+    if(event==0) { // always true for Pb-Pb (avoid to read-in tree every time)
+      refTree0->GetEvent(theD0->GetTrkNum(0));
+      pdg[0]    = reftrk.pdg;
+      mumpdg[0] = reftrk.mumpdg;
+      mumlab[0] = reftrk.mumlab;
+      refTree0->GetEvent(theD0->GetTrkNum(1));
+      pdg[1]    = reftrk.pdg;
+      mumpdg[1] = reftrk.mumpdg;
+      mumlab[1] = reftrk.mumlab;
+    } else {
+      sprintf(refTreeName,"Tree_Ref_%d",event);
+      TTree *refTree = (TTree*)refFile->Get(refTreeName);
+      refTree->SetBranchAddress("rectracks",&reftrk);
+      refTree->GetEvent(theD0->GetTrkNum(0));
+      pdg[0]    = reftrk.pdg;
+      mumpdg[0] = reftrk.mumpdg;
+      mumlab[0] = reftrk.mumlab;
+      refTree->GetEvent(theD0->GetTrkNum(1));
+      pdg[1]    = reftrk.pdg;
+      mumpdg[1] = reftrk.mumpdg;
+      mumlab[1] = reftrk.mumlab;
+      delete refTree;
+    }
+    
+    theD0->SetPdgCodes(pdg);
+    theD0->SetMumPdgCodes(mumpdg);
+    
+    if(TMath::Abs(mumpdg[0])==421 && 
+       TMath::Abs(mumpdg[1])==421 && 
+       mumlab[0]==mumlab[1] &&
+       reftrk.mumprongs==2 && 
+       ((TMath::Abs(pdg[0])==211 && TMath::Abs(pdg[1])==321) ||  
+       (TMath::Abs(pdg[0])==321 && TMath::Abs(pdg[1])==211))
+       ) theD0->SetSignal();
+    
+    if(!fOnlySignal || theD0->IsSignal()) treeD0out->Fill();
+
+  }
+
+  delete refTree0;
+
+  refFile->Close();
+
+  return;
+}
+
+
+
+
+
+
diff --git a/PWG3/AliD0toKpiAnalysis.h b/PWG3/AliD0toKpiAnalysis.h
new file mode 100644 (file)
index 0000000..bc6ebcf
--- /dev/null
@@ -0,0 +1,90 @@
+#ifndef AliD0toKpiAnalysis_H
+#define AliD0toKpiAnalysis_H
+/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * See cxx source for full Copyright notice                               */
+
+//-------------------------------------------------------------------------
+//                      Class AliD0toKpiAnalysis
+//             Reconstruction and analysis D0 -> K^- pi^+
+//      
+//         Origin: A. Dainese    andrea.dainese@lnl.infn.it                  
+//-------------------------------------------------------------------------
+
+#include <TString.h>
+#include <TNamed.h>
+#include "AliESD.h"
+#include "AliRun.h"
+
+//-----------------------------------------------------------------------------
+class AliD0toKpiAnalysis : public TNamed {
+ public:
+  //
+  AliD0toKpiAnalysis();
+  virtual ~AliD0toKpiAnalysis();
+
+  void ApplySelection(const Char_t *inName="AliD0toKpi.root",
+                     const Char_t *outName="AliD0toKpi_sele.root") const;
+  void FindCandidates(Int_t evFirst=0,Int_t evLast=0,
+                     const Char_t *outName="AliD0toKpi.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 SetPtCut(Double_t pt=0.) { fPtCut=pt; }
+  void Setd0Cut(Double_t d0=0.) { fd0Cut=d0; } 
+  void SetMassCut(Double_t deltaM=1000.) { fMassCut=deltaM; }
+  void SetD0Cuts(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 SetD0Cuts(const Double_t cuts[9]); 
+  void SetPID(const Char_t * pid="TOFparam_PbPb") { 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)
+  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-MD0| (in GeV)
+  Double_t fD0Cuts[9]; // cuts on D0 candidates (see SetD0Cuts())
+                       // (to be passed to function AliD0toKpi::Select())
+                       // 0 = inv. mass half width [GeV]   
+                       // 1 = dca [micron]
+                       // 2 = cosThetaStar 
+                       // 3 = pTK [GeV/c]
+                       // 4 = pTPi [GeV/c]
+                       // 5 = d0K [micron]   upper limit!
+                       // 6 = d0Pi [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 *treeD0in,TTree *treeD0out) const;
+  Bool_t   SingleTrkCuts(const AliESDtrack& trk, Double_t b) const;
+  //
+  ClassDef(AliD0toKpiAnalysis,3)  // Reconstruction of D0 candidates class
+};
+
+
+#endif
+
+
+
+
+
+
+
+
diff --git a/PWG3/AliD0toKpiPlots.C b/PWG3/AliD0toKpiPlots.C
new file mode 100644 (file)
index 0000000..2096a59
--- /dev/null
@@ -0,0 +1,235 @@
+void AliD0toKpiPlots(const Char_t *inName="AliD0toKpi.root",
+                    const Char_t *outName="D0histograms.root") {
+  //--------------------------------------------------------------------------
+  // This macro histograms many variables of D0->Kpi candidates
+  //
+  //     Andrea Dainese, andrea.dainese@lnl.infn.it
+  //--------------------------------------------------------------------------
+
+  gSystem->Load("libAOD.so");
+  gSystem->Load("libPWG3base.so");
+
+  // set of cuts
+  Double_t D0Cuts[9] = {0.1,         // mass [GeV]
+                       1000000.,          // dca [micron]
+                       1.1,           // cosThetaStar
+                       0.,           // pT K [GeV/c]
+                       0.,           // pT Pi [GeV/c]    
+                       100000.,       // d0K upper [micron]
+                       100000.,       // d0Pi upper [micron]
+                       10000000000.,            // d0d0 [micron^2]
+                       -1.1};          // cosThetaPointing
+
+  // number of events (for normalization)
+  Bool_t normalize = kFALSE;
+  Double_t  events = 1.;
+
+
+
+  // define histograms
+  TH1F *hptK = new TH1F("hptK","\"K\" p_{t} distribution",50,0,10);
+  hptK->SetXTitle("p_{t} [GeV]");
+
+  TH1F *hptPi = new TH1F("hptPi","\"#pi\" p_{t} distribution",50,0,10);
+  hptPi->SetXTitle("p_{t} [GeV]");
+
+  TH1F *hDCA = new TH1F("hDCA","DCA",50,0,1000);
+  hDCA->SetXTitle("dca [#mu m]");
+
+  TH1F *hptD0 = new TH1F("hptD0","D^{0} p_{t} distribution",40,0,40);
+  hptD0->SetXTitle("p_{t} [GeV]");
+
+  TH1F *hyD0 = new TH1F("hyD0","D^{0} rapidity distribution",50,-2,2);
+  hyD0->SetXTitle("y");
+
+  TH1F *hCPtaD0 = new TH1F("hCPtaD0","cosine of pointing angle distribution",100,-1,1);
+  hCPtaD0->SetXTitle("cos #theta_{point}");
+
+  TH1F *hCPtaXY = new TH1F("hCPtaXY","cosine of pointing angle in (x,y) plane",100,-1,1);
+  hCPtaXY->SetXTitle("cos #theta_{point}");
+
+  TH1F *hCts = new TH1F("hCts","cosine of decay angle",50,-1.2,1.2);
+  hCts->SetXTitle("cos #theta^{*}");
+
+  TH2F *hCtsVsPtK = new TH2F("hCtsVsPtK","cosine of decay angle VS \"K\" p_{t}",50,0,5,50,-1,1);
+  hCtsVsPtK->SetYTitle("cos #theta^{*}");
+  hCtsVsPtK->SetXTitle("p_{t} [GeV]");
+
+  TH1F *hd0d0 = new TH1F("hd0d0","Product of the impact parameters",100,-100000,100000);
+  hd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
+
+  TH1F *hd0K = new TH1F("hd0K","Impact parameter of \"K\"",100,-5000,5000);
+  hd0K->SetXTitle("d_{0}^{K} [#mu m]");
+
+  TH1F *hd0Pi = new TH1F("hd0Pi","Impact parameter of \"#pi\"",100,-5000,5000);
+  hd0Pi->SetXTitle("d_{0}^{#pi} [#mu m]");
+
+  TH2F *hCPtaVsd0d0 = new TH2F("hCPtaVsd0d0","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,100000,100,-1,1);
+  hCPtaVsd0d0->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
+  hCPtaVsd0d0->SetYTitle("cos #theta_{point}");
+
+  TH2F *hCPtaVsd0d0zoom = new TH2F("hCPtaVsd0d0zoom","cos #theta_{point} vs d_{0}^{K} #times d_{0}^{#pi}",100,-100000,0,100,.9,1);
+  hCPtaVsd0d0zoom->SetXTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
+  hCPtaVsd0d0zoom->SetYTitle("cos #theta_{point}");
+
+  TH2F *hd0d0VSptD0 = new TH2F("hd0d0VSptD0","d_{0}^{K} #times d_{0}^{#pi} VS D^{0} p_{t}",50,0,25,100,-120000,120000);
+  hd0d0VSptD0->SetYTitle("d_{0}^{K} #times d_{0}^{#pi} [#mu m^{2}]");
+  hd0d0VSptD0->SetXTitle("D^{0} p_{t} [GeV]");
+
+  TH1F *hMass = new TH1F("hMass","Invariant mass distribution",50,1.765,1.965);
+  hMass->SetXTitle("M[K,#pi] [GeV]");
+
+  TH2F *hArm = new TH2F("hArm","Armenteros plot",50,-2,2,50,0,1);
+  hArm->SetXTitle("#alpha");
+  hArm->SetYTitle("q_{t}");
+
+  // open input file and get tree
+  TFile *inFile = TFile::Open(inName);
+
+  TTree *treeD0 = (TTree*)inFile->Get("TreeD0");
+  AliD0toKpi *D = 0; 
+  treeD0->SetBranchAddress("D0toKpi",&D);
+  Int_t entries = (Int_t)treeD0->GetEntries();
+
+  printf("+++\n+++ Number of D0 in tree:  %d\n+++\n",entries);
+
+  Double_t MD0,MD0bar,ctsD0,ctsD0bar,ctsPiD0,ctsPiD0bar;
+  Double_t WgtD0,WgtD0bar;
+  Double_t sampleABC=0.;
+  Int_t okD0=0,okD0bar=0;
+  Int_t nSel = 0;
+  Int_t ptbin;
+
+  // loop on D0
+  for(Int_t i=0; i<entries; i++) {
+    if(i%10000==0) printf(" candidate %d of %d\n",i,entries);
+
+    // get event from tree
+    treeD0->GetEvent(i);
+    //--- select the PID strategy & compute weights
+    //    D->ApplyPID("TOFparam_PbPb");
+    //    D->ComputeWgts();
+    // get weights for the three samples A+B+C 
+    //    D->GetWgts(WgtD0,WgtD0bar,"ABC");
+    WgtD0 = 1.; WgtD0bar = 1.;
+
+    // normalize to 1 event
+    if(normalize) { WgtD0 /= events; WgtD0bar /= events; }
+
+    // check if candidate passes selection (as D0 or D0bar)
+    D->Select(D0Cuts,okD0,okD0bar);
+
+    // set weights to 0 if the candidate doesn't pass selection
+    if(!okD0)    WgtD0=0.; 
+    if(!okD0bar) WgtD0bar=0.;
+    if(okD0 || okD0bar) nSel++;
+
+    // count selected candidates
+    sampleABC += WgtD0 + WgtD0bar;
+
+    // inv mass and cosThetaStar
+    D->InvMass(MD0,MD0bar);
+    D->CosThetaStar(ctsD0,ctsD0bar);
+    
+    // fill histograms
+    hptK->Fill(D->PtChild(1),WgtD0);
+    hptK->Fill(D->PtChild(0),WgtD0bar);
+    hptPi->Fill(D->PtChild(0),WgtD0);
+    hptPi->Fill(D->PtChild(1),WgtD0bar);
+    hd0K->Fill(D->Getd0Child(1),WgtD0);
+    hd0K->Fill(D->Getd0Child(0),WgtD0bar);
+    hd0Pi->Fill(D->Getd0Child(0),WgtD0);
+    hd0Pi->Fill(D->Getd0Child(1),WgtD0bar);   
+    hMass->Fill(MD0,WgtD0);
+    hMass->Fill(MD0bar,WgtD0bar);
+    hCts->Fill(ctsD0,WgtD0);
+    hCts->Fill(ctsD0bar,WgtD0bar);
+    hCtsVsPtK->Fill(D->PtChild(1),ctsD0,WgtD0);
+    hCtsVsPtK->Fill(D->PtChild(0),ctsD0bar,WgtD0bar);
+    hDCA->Fill(D->GetDCA(),WgtD0+WgtD0bar);
+    hptD0->Fill(D->Pt(),WgtD0+WgtD0bar);
+    hyD0->Fill(D->Rapidity(),WgtD0+WgtD0bar);
+    hd0d0->Fill(D->ProdImpParams(),WgtD0+WgtD0bar);
+    hCPtaD0->Fill(D->CosPointing(),WgtD0+WgtD0bar);
+    hCPtaXY->Fill(D->CosPointingXY(),WgtD0+WgtD0bar);
+    hCPtaVsd0d0->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
+    hd0d0VSptD0->Fill(D->Pt(),D->ProdImpParams(),WgtD0+WgtD0bar);
+    hCPtaVsd0d0zoom->Fill(D->ProdImpParams(),D->CosPointing(),WgtD0+WgtD0bar);
+    hArm->Fill(D->Alpha(),D->Qt(),WgtD0+WgtD0bar);
+    
+   
+  } // end loop on D0 candidates
+
+  inFile->Close();
+
+  printf("\n\n --- Total number of candidates passing selection: %d\n\n --- Sum of weights sample A+B+C: %f\n\n",nSel,sampleABC); 
+  
+  // draw histograms
+  TCanvas *c1 = new TCanvas("c1","pt K & pi",0,0,700,700);
+  c1->SetLogy(); 
+  hptK->Draw();
+  hptPi->Draw("same");
+
+  TCanvas *c2 = new TCanvas("c2","pt D0",0,0,700,700);
+  c2->SetLogy(); 
+  hptD0->Draw();
+
+  TCanvas *c3 = new TCanvas("c3","rapidity D0",0,0,700,700);
+  hyD0->Draw(); 
+
+  TCanvas *c4 = new TCanvas("c4","pointing angle",0,0,700,700);
+  hCPtaD0->Draw();
+
+  TCanvas *c5 = new TCanvas("c5","d0 x d0",0,0,700,700);
+  c5->SetLogy();
+  hd0d0->Draw();
+
+  TCanvas *c6 = new TCanvas("c6","pointing angle VS d0d0",0,0,700,700);
+  c6->SetLogz();
+  hCPtaVsd0d0->Draw("box");
+
+  TCanvas *c7 = new TCanvas("c7","mass",0,0,700,700);
+  hMass->Draw();
+
+  TCanvas *c8 = new TCanvas("c8","armenteros",0,0,700,700);
+  hArm->Draw("box");
+
+  TCanvas *c9 = new TCanvas("c9","decay angle",0,0,700,700); 
+  hCts->Draw();
+
+  TCanvas *c10 = new TCanvas("c10","dca",0,0,700,700);
+  c10->SetLogy();
+  hDCA->Draw();
+
+  TCanvas *c11 = new TCanvas("c11","d0 K & pi",0,0,700,700);
+  c11->SetLogy();
+  hd0K->Draw();
+  hd0Pi->Draw("same");
+
+  // write all histograms to file
+  TFile *outFile = new TFile(outName,"recreate");
+  hMass->Write();
+  hDCA->Write(); 
+  hCts->Write();
+  hCtsVsPtK->Write();
+  hArm->Write();
+  hCPtaVsd0d0->Write();
+  hd0d0VSptD0->Write();
+  hCPtaVsd0d0zoom->Write();
+  hd0d0->Write();
+  hCPtaD0->Write();
+  hCPtaXY->Write();
+  hptK->Write();
+  hptPi->Write();
+  hptD0->Write();
+  hyD0->Write();
+  hd0K->Write();
+  hd0Pi->Write();
+  outFile->Close();
+  
+  return;
+}
+
+
+
+
index 83a93f3..5ddb852 100644 (file)
@@ -6,7 +6,8 @@
 
 void AliD0toKpiReco() {
   
-  gSystem->Load("libANALYSIS.so");
+  gSystem->Load("libAOD.so");
+  gSystem->Load("libPWG3base.so");
 
   //==============  R E C O N S T R U C T I O N ==============================
 
@@ -67,7 +68,8 @@ void AliD0toKpiReco() {
 //==========================================================================
 void AliD0toKpiSele() {  
 
-  gSystem->Load("libANALYSIS.so");
+  gSystem->Load("libAOD.so");
+  gSystem->Load("libPWG3base.so");
 
   //========================  S E L E C T I O N ============================