PWG3/vertexingHF/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   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  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 /* $Id$ */
  17
  18 /////////////////////////////////////////////////////////////
  19 //
  20 // Base class for AOD reconstructed heavy-flavour 3-prong decay
  21 //
  22 // Author: E.Bruna bruna@to.infn.it, F.Prino prino@to.infn.it
  23 /////////////////////////////////////////////////////////////
  24
  25 #include <TDatabasePDG.h>
  26 #include "AliAODRecoDecayHF.h"
  27 #include "AliAODRecoDecayHF3Prong.h"
  28 #include "AliAODTrack.h"
  29
  30 ClassImp(AliAODRecoDecayHF3Prong)
  31
  32 //--------------------------------------------------------------------------
  33 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong() :
  34   AliAODRecoDecayHF(),
  35   fSigmaVert(0),
  36   fDist12toPrim(0),
  37   fDist23toPrim(0)
  38 {
  39   //
  40   // Default Constructor
  41   //
  42 }
  43 //--------------------------------------------------------------------------
  44 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(AliAODVertex *vtx2,
  45                                                  Double_t *px,Double_t *py,Double_t *pz,
  46                                                  Double_t *d0,Double_t *d0err,
  47                                                  Double_t *dca, Double_t sigvert,
  48                                                  Double_t dist12,Double_t dist23,Short_t charge) :
  49   AliAODRecoDecayHF(vtx2,3,charge,px,py,pz,d0,d0err),
  50   fSigmaVert(sigvert),
  51   fDist12toPrim(dist12),
  52   fDist23toPrim(dist23)
  53 {
  54   //
  55   // Constructor with AliAODVertex for decay vertex
  56   //
  57   SetDCAs(3,dca);
  58 }
  59 //--------------------------------------------------------------------------
  60 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(AliAODVertex *vtx2,
  61                                                  Double_t *d0,Double_t *d0err,
  62                                                  Double_t *dca, Double_t sigvert,
  63                                                  Double_t dist12,Double_t dist23, Short_t charge) :
  64   AliAODRecoDecayHF(vtx2,3,charge,d0,d0err),
  65   fSigmaVert(sigvert),
  66   fDist12toPrim(dist12),
  67   fDist23toPrim(dist23)
  68 {
  69   //
  70   // Constructor with AliAODVertex for decay vertex and without prongs momenta
  71   //
  72   SetDCAs(3,dca);
  73 }
  74 //--------------------------------------------------------------------------
  75 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(const AliAODRecoDecayHF3Prong &source) :
  76   AliAODRecoDecayHF(source),
  77   fSigmaVert(source.fSigmaVert),
  78   fDist12toPrim(source.fDist12toPrim),
  79   fDist23toPrim(source.fDist23toPrim)
  80 {
  81   //
  82   // Copy constructor
  83   //
  84 }
  85 //--------------------------------------------------------------------------
  86 AliAODRecoDecayHF3Prong &AliAODRecoDecayHF3Prong::operator=(const AliAODRecoDecayHF3Prong &source)
  87 {
  88   //
  89   // assignment operator
  90   //
  91   if(&source == this) return *this;
  92
  93   AliAODRecoDecayHF::operator=(source);
  94
  95   fDist12toPrim= source.fDist12toPrim;
  96   fDist23toPrim= source.fDist23toPrim;
  97   fSigmaVert= source.fSigmaVert;
  98
  99   return *this;
 100 }
 101 //-------------Temporary fix: overload AliAODRecoDecay::Charge()-----------
 102 Short_t AliAODRecoDecayHF3Prong::Charge() const {
 103   Short_t charge=0;
 104   for(Int_t daught=0;daught<=2;daught++)charge=charge+((AliAODTrack*)GetDaughter(daught))->Charge();
 105   return charge;
 106 }
 107 //--------------------------------------------------------------------------
 108 Bool_t AliAODRecoDecayHF3Prong::SelectDplus(const Double_t *cuts)
 109   const {
 110 //
 111 // This function compares the Dplus with a set of cuts:
 112 //
 113 // cuts[0] = inv. mass half width [GeV]
 114 // cuts[1] = pTK [GeV/c]
 115 // cuts[2] = pTPi [GeV/c]
 116 // cuts[3] = d0K [cm]   lower limit!
 117 // cuts[4] = d0Pi [cm]  lower limit!
 118 // cuts[5] = dist12 (cm)
 119 // cuts[6] = sigmavert (cm)
 120 // cuts[7] = dist prim-sec (cm)
 121 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
 122 // cuts[9] = cosThetaPoint
 123 // cuts[10] = Sum d0^2 (cm^2)
 124 // cuts[11] = dca cut (cm)
 125 //
 126 // If candidate Dplus does not pass the cuts return kFALSE
 127 //
 128
 129   Double_t mDplusPDG = TDatabasePDG::Instance()->GetParticle(411)->Mass();
 130   Double_t mDplus=InvMassDplus();
 131   if(TMath::Abs(mDplus-mDplusPDG)>cuts[0])return kFALSE;
 132   //single track
 133   if(TMath::Abs(PtProng(1)) < cuts[1] || TMath::Abs(Getd0Prong(1))<cuts[3])return kFALSE;//Kaon
 134   if(TMath::Abs(PtProng(0)) < cuts[2] || TMath::Abs(Getd0Prong(0))<cuts[4])return kFALSE;//Pion1
 135   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion2
 136
 137   //DCA
 138   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
 139
 140   //2track cuts
 141   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
 142   if(Getd0Prong(0)*Getd0Prong(1)<0. && Getd0Prong(2)*Getd0Prong(1)<0.)return kFALSE;
 143
 144   //sec vert
 145   if(fSigmaVert>cuts[6])return kFALSE;
 146
 147   if(DecayLength()<cuts[7])return kFALSE;
 148
 149   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
 150   if(CosPointingAngle()   < cuts[9])return kFALSE;
 151   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
 152   if(sum2<cuts[10])return kFALSE;
 153   return kTRUE;
 154 }
 155 //--------------------------------------------------------------------------
 156 Bool_t AliAODRecoDecayHF3Prong::SelectDs(const Double_t *cuts,Int_t &okDsKKpi,Int_t &okDspiKK, Int_t &okMassPhi, Int_t &okMassK0star)
 157   const {
 158 //
 159 // This function compares the Ds with a set of cuts
 160 // (same variables as D+, for now)
 161 //
 162 // cuts[0] = inv. mass half width [GeV]
 163 // cuts[1] = pTK [GeV/c]
 164 // cuts[2] = pTPi [GeV/c]
 165 // cuts[3] = d0K [cm]   lower limit!
 166 // cuts[4] = d0Pi [cm]  lower limit!
 167 // cuts[5] = dist12 (cm)
 168 // cuts[6] = sigmavert (cm)
 169 // cuts[7] = dist prim-sec (cm)
 170 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
 171 // cuts[9] = cosThetaPoint
 172 // cuts[10] = Sum d0^2 (cm^2)
 173 // cuts[11] = dca cut (cm)
 174 // cuts[12] = max. inv. mass difference(Mphi-MKK) [GeV]
 175 // cuts[13] = max. inv. mass difference(MK0*-MKpi) [GeV]
 176 //
 177 // If candidate Ds does not pass the cuts return kFALSE
 178 //
 179   Double_t mDsKKpi,mDspiKK;
 180   okDsKKpi=1; okDspiKK=1;
 181   okMassPhi=0; okMassK0star=0;
 182
 183   Double_t mDsPDG = TDatabasePDG::Instance()->GetParticle(431)->Mass();
 184
 185   mDsKKpi=InvMassDsKKpi();
 186   mDspiKK=InvMassDspiKK();
 187
 188   if(TMath::Abs(mDsKKpi-mDsPDG)>cuts[0]) okDsKKpi = 0;
 189   if(TMath::Abs(mDspiKK-mDsPDG)>cuts[0]) okDspiKK = 0;
 190   if(!okDsKKpi && !okDspiKK) return kFALSE;
 191
 192   //single track
 193   if(TMath::Abs(PtProng(0)) < cuts[1] || TMath::Abs(Getd0Prong(0))<cuts[3])return kFALSE;//Kaon1
 194   if(TMath::Abs(PtProng(1)) < cuts[1] || TMath::Abs(Getd0Prong(1))<cuts[3])return kFALSE;//Kaon2
 195   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion
 196
 197   // cuts on resonant decays (via Phi or K0*)
 198   Double_t mPhiPDG = TDatabasePDG::Instance()->GetParticle(333)->Mass();
 199   Double_t mK0starPDG = TDatabasePDG::Instance()->GetParticle(313)->Mass();
 200   if(okDsKKpi){
 201     Double_t mass01phi=InvMass2Prongs(0,1,321,321);
 202     Double_t mass12K0s=InvMass2Prongs(1,2,321,211);
 203     if(TMath::Abs(mass01phi-mPhiPDG)<cuts[12]) okMassPhi=1;
 204     if(TMath::Abs(mass12K0s-mK0starPDG)<cuts[13]) okMassK0star = 1;
 205     if(!okMassPhi && !okMassK0star) okDsKKpi=kFALSE;
 206   }
 207   if(okDspiKK){
 208     Double_t mass01K0s=InvMass2Prongs(0,1,211,321);
 209     Double_t mass12phi=InvMass2Prongs(1,2,321,321);
 210     if(TMath::Abs(mass01K0s-mK0starPDG)<cuts[13]) okMassK0star = 1;
 211     if(TMath::Abs(mass12phi-mPhiPDG)<cuts[12]) okMassPhi=1;
 212     if(!okMassPhi && !okMassK0star) okDspiKK=kFALSE;
 213   }
 214   if(!okDsKKpi && !okDspiKK) return kFALSE;
 215
 216
 217
 218
 219   //DCA
 220   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
 221
 222   //2track cuts
 223   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
 224
 225   //sec vert
 226   if(fSigmaVert>cuts[6])return kFALSE;
 227
 228   if(DecayLength()<cuts[7])return kFALSE;
 229
 230   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
 231   if(CosPointingAngle()   < cuts[9])return kFALSE;
 232   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
 233   if(sum2<cuts[10])return kFALSE;
 234
 235   return kTRUE;
 236 }
 237 //--------------------------------------------------------------------------
 238 Bool_t AliAODRecoDecayHF3Prong::SelectLc(const Double_t *cuts,Int_t &okLcpKpi,Int_t &okLcpiKp)
 239   const {
 240 //
 241 // This function compares the Lc with a set of cuts
 242 // (same variables as D+, for now)
 243 //
 244 // cuts[0] = inv. mass half width [GeV]
 245 // cuts[1] = pTP [GeV/c]
 246 // cuts[2] = pTPi and pTK [GeV/c]
 247 // cuts[3] = d0P [cm]   lower limit!
 248 // cuts[4] = d0Pi and d0K [cm]  lower limit!
 249 // cuts[5] = dist12 (cm)
 250 // cuts[6] = sigmavert (cm)
 251 // cuts[7] = dist prim-sec (cm)
 252 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
 253 // cuts[9] = cosThetaPoint
 254 // cuts[10] = Sum d0^2 (cm^2)
 255 // cuts[11] = dca cut (cm)
 256 //
 257 // If candidate Lc does not pass the cuts return kFALSE
 258 //
 259   Double_t mLcpKpi,mLcpiKp;
 260   okLcpKpi=1; okLcpiKp=1;
 261
 262   Double_t mLcPDG = TDatabasePDG::Instance()->GetParticle(4122)->Mass();
 263
 264   mLcpKpi=InvMassLcpKpi();
 265   mLcpiKp=InvMassLcpiKp();
 266
 267   if(TMath::Abs(mLcpKpi-mLcPDG)>cuts[0]) okLcpKpi = 0;
 268   if(TMath::Abs(mLcpiKp-mLcPDG)>cuts[0]) okLcpiKp = 0;
 269   if(!okLcpKpi && !okLcpiKp) return kFALSE;
 270
 271   //single track
 272   if(TMath::Abs(PtProng(0)) < cuts[1] || TMath::Abs(Getd0Prong(0))<cuts[3])return kFALSE;//Proton
 273   if(TMath::Abs(PtProng(1)) < cuts[2] || TMath::Abs(Getd0Prong(1))<cuts[4])return kFALSE;//Kaon
 274   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion
 275
 276   //DCA
 277   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
 278
 279   //2track cuts
 280   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
 281   if(Getd0Prong(0)*Getd0Prong(1)<0. && Getd0Prong(2)*Getd0Prong(1)<0.)return kFALSE;
 282
 283   //sec vert
 284   if(fSigmaVert>cuts[6])return kFALSE;
 285
 286   if(DecayLength()<cuts[7])return kFALSE;
 287
 288   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
 289   if(CosPointingAngle()   < cuts[9])return kFALSE;
 290   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
 291   if(sum2<cuts[10])return kFALSE;
 292
 293   return kTRUE;
 294 }