PWG3/AliAODRecoDecayHF3Prong.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-2006, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
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  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /////////////////////////////////////////////////////////////
  17 //
  18 // Base class for AOD reconstructed heavy-flavour 3-prong decay
  19 //
  20 // Author: E.Bruna bruna@to.infn.it, F.Prino prino@to.infn.it
  21 /////////////////////////////////////////////////////////////
  22
  23 #include <TDatabasePDG.h>
  24 #include "AliAODRecoDecayHF.h"
  25 #include "AliAODRecoDecayHF3Prong.h"
  26
  27 ClassImp(AliAODRecoDecayHF3Prong)
  28
  29 //--------------------------------------------------------------------------
  30 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong() :
  31   AliAODRecoDecayHF(),
  32   fSigmaVert(0),
  33   fDist12toPrim(0),
  34   fDist23toPrim(0)
  35 {
  36   //
  37   // Default Constructor
  38   //
  39 }
  40 //--------------------------------------------------------------------------
  41 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(AliAODVertex *vtx2,
  42                                                  Double_t *px,Double_t *py,Double_t *pz,
  43                                                  Double_t *d0,Double_t *d0err,
  44                                                  Double_t *dca, Double_t sigvert,
  45                                                  Double_t dist12,Double_t dist23,Short_t charge) :
  46   AliAODRecoDecayHF(vtx2,3,charge,px,py,pz,d0,d0err),
  47   fSigmaVert(sigvert),
  48   fDist12toPrim(dist12),
  49   fDist23toPrim(dist23)
  50 {
  51   //
  52   // Constructor with AliAODVertex for decay vertex
  53   //
  54   Double_t dcafloat[3];
  55   for(Int_t i=0;i<3;i++)dcafloat[i]=dca[i];
  56   SetDCAs(3,dcafloat);
  57 }
  58 //--------------------------------------------------------------------------
  59 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(AliAODVertex *vtx2,
  60                                                  Double_t *d0,Double_t *d0err,
  61                                                  Double_t *dca, Double_t sigvert,
  62                                                  Double_t dist12,Double_t dist23, Short_t charge) :
  63   AliAODRecoDecayHF(vtx2,3,charge,d0,d0err),
  64   fSigmaVert(sigvert),
  65   fDist12toPrim(dist12),
  66   fDist23toPrim(dist23)
  67 {
  68   //
  69   // Constructor with AliAODVertex for decay vertex and without prongs momenta
  70   //
  71   Double_t dcafloat[3];
  72   for(Int_t i=0;i<3;i++)dcafloat[i]=dca[i];
  73   SetDCAs(3,dcafloat);
  74 }
  75 //--------------------------------------------------------------------------
  76 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(const AliAODRecoDecayHF3Prong &source) :
  77   AliAODRecoDecayHF(source),
  78   fSigmaVert(source.fSigmaVert),
  79   fDist12toPrim(source.fDist12toPrim),
  80   fDist23toPrim(source.fDist23toPrim)
  81 {
  82   //
  83   // Copy constructor
  84   //
  85 }
  86 //--------------------------------------------------------------------------
  87 AliAODRecoDecayHF3Prong &AliAODRecoDecayHF3Prong::operator=(const AliAODRecoDecayHF3Prong &source)
  88 {
  89   //
  90   // assignment operator
  91   //
  92   if(&source == this) return *this;
  93   fOwnPrimaryVtx = source.fOwnPrimaryVtx;
  94   fSecondaryVtx = source.fSecondaryVtx;
  95   fCharge = source.fCharge;
  96   fNProngs = source.fNProngs;
  97   fNDCA = source.fNDCA;
  98   fNPID = source.fNPID;
  99   fEventNumber = source.fEventNumber;
 100   fRunNumber = source.fRunNumber;
 101   fDist12toPrim= source.fDist12toPrim;
 102   fDist23toPrim= source.fDist23toPrim;
 103   fSigmaVert= source.fSigmaVert;
 104   if(source.GetNProngs()>0) {
 105     fd0 = new Double_t[GetNProngs()];
 106     fd0err = new Double_t[GetNProngs()];
 107     memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
 108     memcpy(fd0err,source.fd0err,GetNProngs()*sizeof(Double_t));
 109     if(source.fPx) {
 110       fPx = new Double_t[GetNProngs()];
 111       fPy = new Double_t[GetNProngs()];
 112       fPz = new Double_t[GetNProngs()];
 113       memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
 114       memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
 115       memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
 116     }
 117     if(source.fPID) {
 118       fPID = new Double_t[5*GetNProngs()];
 119       memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
 120     }
 121     if(source.fDCA) {
 122       fDCA = new Double32_t[GetNProngs()*(GetNProngs()-1)/2];
 123       memcpy(fDCA,source.fDCA,(GetNProngs()*(GetNProngs()-1)/2)*sizeof(Float_t));
 124     }
 125   }
 126   return *this;
 127 }
 128 //--------------------------------------------------------------------------
 129 Bool_t AliAODRecoDecayHF3Prong::SelectDplus(const Double_t *cuts)
 130   const {
 131 //
 132 // This function compares the Dplus with a set of cuts:
 133 //
 134 // cuts[0] = inv. mass half width [GeV]
 135 // cuts[1] = pTK [GeV/c]
 136 // cuts[2] = pTPi [GeV/c]
 137 // cuts[3] = d0K [cm]   lower limit!
 138 // cuts[4] = d0Pi [cm]  lower limit!
 139 // cuts[5] = dist12 (cm)
 140 // cuts[6] = sigmavert (cm)
 141 // cuts[7] = dist prim-sec (cm)
 142 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
 143 // cuts[9] = cosThetaPoint
 144 // cuts[10] = Sum d0^2 (cm^2)
 145 // cuts[11] = dca cut (cm)
 146 //
 147 // If candidate Dplus does not pass the cuts return kFALSE
 148 //
 149
 150   Double_t mDplusPDG = TDatabasePDG::Instance()->GetParticle(411)->Mass();
 151   Double_t mDplus=InvMassDplus();
 152   if(TMath::Abs(mDplus-mDplusPDG)>cuts[0])return kFALSE;
 153   //single track
 154   if(TMath::Abs(PtProng(1)) < cuts[1] || TMath::Abs(Getd0Prong(1))<cuts[3])return kFALSE;//Kaon
 155   if(TMath::Abs(PtProng(0)) < cuts[2] || TMath::Abs(Getd0Prong(0))<cuts[4])return kFALSE;//Pion1
 156   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion2
 157
 158   //DCA
 159   for(Int_t i=0;i<3;i++) if(cuts[11]>0 && GetDCA(i)>cuts[11])return kFALSE;
 160
 161   //2track cuts
 162   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
 163   if(Getd0Prong(0)*Getd0Prong(1)<0. && Getd0Prong(2)*Getd0Prong(1)<0.)return kFALSE;
 164
 165   //sec vert
 166   if(fSigmaVert>cuts[6])return kFALSE;
 167
 168   if(DecayLength()<cuts[7])return kFALSE;
 169
 170   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
 171   if(CosPointingAngle()   < cuts[9])return kFALSE;
 172   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
 173   if(sum2<cuts[10])return kFALSE;
 174   return kTRUE;
 175 }