PWG3/vertexingHF/AliAODRecoDecayHF3Prong.cxx

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  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   SetDCAs(3,dca);
  55 }
  56 //--------------------------------------------------------------------------
  57 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(AliAODVertex *vtx2,
  58                                                  Double_t *d0,Double_t *d0err,
  59                                                  Double_t *dca, Double_t sigvert,
  60                                                  Double_t dist12,Double_t dist23, Short_t charge) :
  61   AliAODRecoDecayHF(vtx2,3,charge,d0,d0err),
  62   fSigmaVert(sigvert),
  63   fDist12toPrim(dist12),
  64   fDist23toPrim(dist23)
  65 {
  66   //
  67   // Constructor with AliAODVertex for decay vertex and without prongs momenta
  68   //
  69   SetDCAs(3,dca);
  70 }
  71 //--------------------------------------------------------------------------
  72 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(const AliAODRecoDecayHF3Prong &source) :
  73   AliAODRecoDecayHF(source),
  74   fSigmaVert(source.fSigmaVert),
  75   fDist12toPrim(source.fDist12toPrim),
  76   fDist23toPrim(source.fDist23toPrim)
  77 {
  78   //
  79   // Copy constructor
  80   //
  81 }
  82 //--------------------------------------------------------------------------
  83 AliAODRecoDecayHF3Prong &AliAODRecoDecayHF3Prong::operator=(const AliAODRecoDecayHF3Prong &source)
  84 {
  85   //
  86   // assignment operator
  87   //
  88   if(&source == this) return *this;
  89
  90   AliAODRecoDecayHF::operator=(source);
  91
  92   fDist12toPrim= source.fDist12toPrim;
  93   fDist23toPrim= source.fDist23toPrim;
  94   fSigmaVert= source.fSigmaVert;
  95
  96   return *this;
  97 }
  98 //--------------------------------------------------------------------------
  99 Bool_t AliAODRecoDecayHF3Prong::SelectDplus(const Double_t *cuts)
 100   const {
 101 //
 102 // This function compares the Dplus with a set of cuts:
 103 //
 104 // cuts[0] = inv. mass half width [GeV]
 105 // cuts[1] = pTK [GeV/c]
 106 // cuts[2] = pTPi [GeV/c]
 107 // cuts[3] = d0K [cm]   lower limit!
 108 // cuts[4] = d0Pi [cm]  lower limit!
 109 // cuts[5] = dist12 (cm)
 110 // cuts[6] = sigmavert (cm)
 111 // cuts[7] = dist prim-sec (cm)
 112 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
 113 // cuts[9] = cosThetaPoint
 114 // cuts[10] = Sum d0^2 (cm^2)
 115 // cuts[11] = dca cut (cm)
 116 //
 117 // If candidate Dplus does not pass the cuts return kFALSE
 118 //
 119
 120   Double_t mDplusPDG = TDatabasePDG::Instance()->GetParticle(411)->Mass();
 121   Double_t mDplus=InvMassDplus();
 122   if(TMath::Abs(mDplus-mDplusPDG)>cuts[0])return kFALSE;
 123   //single track
 124   if(TMath::Abs(PtProng(1)) < cuts[1] || TMath::Abs(Getd0Prong(1))<cuts[3])return kFALSE;//Kaon
 125   if(TMath::Abs(PtProng(0)) < cuts[2] || TMath::Abs(Getd0Prong(0))<cuts[4])return kFALSE;//Pion1
 126   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion2
 127
 128   //DCA
 129   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
 130
 131   //2track cuts
 132   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
 133   if(Getd0Prong(0)*Getd0Prong(1)<0. && Getd0Prong(2)*Getd0Prong(1)<0.)return kFALSE;
 134
 135   //sec vert
 136   if(fSigmaVert>cuts[6])return kFALSE;
 137
 138   if(DecayLength()<cuts[7])return kFALSE;
 139
 140   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
 141   if(CosPointingAngle()   < cuts[9])return kFALSE;
 142   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
 143   if(sum2<cuts[10])return kFALSE;
 144   return kTRUE;
 145 }
 146 //--------------------------------------------------------------------------
 147 Bool_t AliAODRecoDecayHF3Prong::SelectDs(const Double_t *cuts,Int_t &okDsKKpi,Int_t &okDspiKK, Int_t &okMassPhi, Int_t &okMassK0star)
 148   const {
 149 //
 150 // This function compares the Ds with a set of cuts
 151 // (same variables as D+, for now)
 152 //
 153 // cuts[0] = inv. mass half width [GeV]
 154 // cuts[1] = pTK [GeV/c]
 155 // cuts[2] = pTPi [GeV/c]
 156 // cuts[3] = d0K [cm]   lower limit!
 157 // cuts[4] = d0Pi [cm]  lower limit!
 158 // cuts[5] = dist12 (cm)
 159 // cuts[6] = sigmavert (cm)
 160 // cuts[7] = dist prim-sec (cm)
 161 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
 162 // cuts[9] = cosThetaPoint
 163 // cuts[10] = Sum d0^2 (cm^2)
 164 // cuts[11] = dca cut (cm)
 165 // cuts[12] = max. inv. mass difference(Mphi-MKK) [GeV]
 166 // cuts[13] = max. inv. mass difference(MK0*-MKpi) [GeV]
 167 //
 168 // If candidate Ds does not pass the cuts return kFALSE
 169 //
 170   Double_t mDsKKpi,mDspiKK;
 171   okDsKKpi=1; okDspiKK=1;
 172   okMassPhi=0; okMassK0star=0;
 173
 174   Double_t mDsPDG = TDatabasePDG::Instance()->GetParticle(431)->Mass();
 175
 176   mDsKKpi=InvMassDsKKpi();
 177   mDspiKK=InvMassDspiKK();
 178
 179   if(TMath::Abs(mDsKKpi-mDsPDG)>cuts[0]) okDsKKpi = 0;
 180   if(TMath::Abs(mDspiKK-mDsPDG)>cuts[0]) okDspiKK = 0;
 181   if(!okDsKKpi && !okDspiKK) return kFALSE;
 182
 183   //single track
 184   if(TMath::Abs(PtProng(0)) < cuts[1] || TMath::Abs(Getd0Prong(0))<cuts[3])return kFALSE;//Kaon1
 185   if(TMath::Abs(PtProng(1)) < cuts[1] || TMath::Abs(Getd0Prong(1))<cuts[3])return kFALSE;//Kaon2
 186   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion
 187
 188   // cuts on resonant decays (via Phi or K0*)
 189   Double_t mPhiPDG = TDatabasePDG::Instance()->GetParticle(333)->Mass();
 190   Double_t mK0starPDG = TDatabasePDG::Instance()->GetParticle(313)->Mass();
 191   if(okDsKKpi){
 192     Double_t mass01phi=InvMass2Prongs(0,1,321,321);
 193     Double_t mass12K0s=InvMass2Prongs(1,2,321,211);
 194     if(TMath::Abs(mass01phi-mPhiPDG)<cuts[12]) okMassPhi=1;
 195     if(TMath::Abs(mass12K0s-mK0starPDG)<cuts[13]) okMassK0star = 1;
 196     if(!okMassPhi && !okMassK0star) okDsKKpi=kFALSE;
 197   }
 198   if(okDspiKK){
 199     Double_t mass01K0s=InvMass2Prongs(0,1,211,321);
 200     Double_t mass12phi=InvMass2Prongs(1,2,321,321);
 201     if(TMath::Abs(mass01K0s-mK0starPDG)<cuts[13]) okMassK0star = 1;
 202     if(TMath::Abs(mass12phi-mPhiPDG)<cuts[12]) okMassPhi=1;
 203     if(!okMassPhi && !okMassK0star) okDspiKK=kFALSE;
 204   }
 205   if(!okDsKKpi && !okDspiKK) return kFALSE;
 206
 207
 208
 209
 210   //DCA
 211   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
 212
 213   //2track cuts
 214   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
 215
 216   //sec vert
 217   if(fSigmaVert>cuts[6])return kFALSE;
 218
 219   if(DecayLength()<cuts[7])return kFALSE;
 220
 221   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
 222   if(CosPointingAngle()   < cuts[9])return kFALSE;
 223   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
 224   if(sum2<cuts[10])return kFALSE;
 225
 226   return kTRUE;
 227 }
 228 //--------------------------------------------------------------------------
 229 Bool_t AliAODRecoDecayHF3Prong::SelectLc(const Double_t *cuts,Int_t &okLcpKpi,Int_t &okLcpiKp)
 230   const {
 231 //
 232 // This function compares the Lc with a set of cuts
 233 // (same variables as D+, for now)
 234 //
 235 // cuts[0] = inv. mass half width [GeV]
 236 // cuts[1] = pTP [GeV/c]
 237 // cuts[2] = pTPi and pTK [GeV/c]
 238 // cuts[3] = d0P [cm]   lower limit!
 239 // cuts[4] = d0Pi and d0K [cm]  lower limit!
 240 // cuts[5] = dist12 (cm)
 241 // cuts[6] = sigmavert (cm)
 242 // cuts[7] = dist prim-sec (cm)
 243 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
 244 // cuts[9] = cosThetaPoint
 245 // cuts[10] = Sum d0^2 (cm^2)
 246 // cuts[11] = dca cut (cm)
 247 //
 248 // If candidate Lc does not pass the cuts return kFALSE
 249 //
 250   Double_t mLcpKpi,mLcpiKp;
 251   okLcpKpi=1; okLcpiKp=1;
 252
 253   Double_t mLcPDG = TDatabasePDG::Instance()->GetParticle(4122)->Mass();
 254
 255   mLcpKpi=InvMassLcpKpi();
 256   mLcpiKp=InvMassLcpiKp();
 257
 258   if(TMath::Abs(mLcpKpi-mLcPDG)>cuts[0]) okLcpKpi = 0;
 259   if(TMath::Abs(mLcpiKp-mLcPDG)>cuts[0]) okLcpiKp = 0;
 260   if(!okLcpKpi && !okLcpiKp) return kFALSE;
 261
 262   //single track
 263   if(TMath::Abs(PtProng(0)) < cuts[1] || TMath::Abs(Getd0Prong(0))<cuts[3])return kFALSE;//Proton
 264   if(TMath::Abs(PtProng(1)) < cuts[2] || TMath::Abs(Getd0Prong(1))<cuts[4])return kFALSE;//Kaon
 265   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion
 266
 267   //DCA
 268   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
 269
 270   //2track cuts
 271   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
 272   if(Getd0Prong(0)*Getd0Prong(1)<0. && Getd0Prong(2)*Getd0Prong(1)<0.)return kFALSE;
 273
 274   //sec vert
 275   if(fSigmaVert>cuts[6])return kFALSE;
 276
 277   if(DecayLength()<cuts[7])return kFALSE;
 278
 279   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
 280   if(CosPointingAngle()   < cuts[9])return kFALSE;
 281   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
 282   if(sum2<cuts[10])return kFALSE;
 283
 284   return kTRUE;
 285 }