1 /**************************************************************************
2 * Copyright(c) 1998-2006, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 /////////////////////////////////////////////////////////////
18 // Base class for AOD reconstructed heavy-flavour 2-prong decay
20 // Author: A.Dainese, andrea.dainese@lnl.infn.it
21 /////////////////////////////////////////////////////////////
23 #include <TDatabasePDG.h>
24 #include "AliAODRecoDecayHF.h"
25 #include "AliAODRecoDecayHF2Prong.h"
27 ClassImp(AliAODRecoDecayHF2Prong)
29 //--------------------------------------------------------------------------
30 AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong() :
34 // Default Constructor
37 //--------------------------------------------------------------------------
38 AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong(AliAODVertex *vtx2,
39 Double_t *px,Double_t *py,Double_t *pz,
40 Double_t *d0,Double_t *d0err,Float_t dca) :
41 AliAODRecoDecayHF(vtx2,2,0,px,py,pz,d0,d0err)
44 // Constructor with AliAODVertex for decay vertex
48 //--------------------------------------------------------------------------
49 AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong(AliAODVertex *vtx2,
50 Double_t *d0,Double_t *d0err,Float_t dca) :
51 AliAODRecoDecayHF(vtx2,2,0,d0,d0err)
54 // Constructor with AliAODVertex for decay vertex and without prongs momenta
58 //--------------------------------------------------------------------------
59 AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong(const AliAODRecoDecayHF2Prong &source) :
60 AliAODRecoDecayHF(source)
66 //--------------------------------------------------------------------------
67 AliAODRecoDecayHF2Prong &AliAODRecoDecayHF2Prong::operator=(const AliAODRecoDecayHF2Prong &source)
70 // assignment operator
72 if(&source == this) return *this;
73 fOwnPrimaryVtx = source.fOwnPrimaryVtx;
74 fSecondaryVtx = source.fSecondaryVtx;
75 fCharge = source.fCharge;
76 fNProngs = source.fNProngs;
79 fEventNumber = source.fEventNumber;
80 fRunNumber = source.fRunNumber;
81 if(source.GetNProngs()>0) {
82 fd0 = new Double_t[GetNProngs()];
83 fd0err = new Double_t[GetNProngs()];
84 memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
85 memcpy(fd0err,source.fd0err,GetNProngs()*sizeof(Double_t));
87 fPx = new Double_t[GetNProngs()];
88 fPy = new Double_t[GetNProngs()];
89 fPz = new Double_t[GetNProngs()];
90 memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
91 memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
92 memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
95 fPID = new Double_t[5*GetNProngs()];
96 memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
99 fDCA = new Float_t[GetNProngs()*(GetNProngs()-1)/2];
100 memcpy(fDCA,source.fDCA,(GetNProngs()*(GetNProngs()-1)/2)*sizeof(Float_t));
105 //--------------------------------------------------------------------------
106 Bool_t AliAODRecoDecayHF2Prong::SelectD0(const Double_t *cuts,Int_t &okD0,Int_t &okD0bar)
109 // This function compares the D0 with a set of cuts:
111 // cuts[0] = inv. mass half width [GeV]
112 // cuts[1] = dca [cm]
113 // cuts[2] = cosThetaStar
114 // cuts[3] = pTK [GeV/c]
115 // cuts[4] = pTPi [GeV/c]
116 // cuts[5] = d0K [cm] upper limit!
117 // cuts[6] = d0Pi [cm] upper limit!
118 // cuts[7] = d0d0 [cm^2]
119 // cuts[8] = cosThetaPoint
121 // If the D0/D0bar doesn't pass the cuts it sets the weights to 0
122 // If neither D0 nor D0bar pass the cuts return kFALSE
124 Double_t mD0,mD0bar,ctsD0,ctsD0bar;
127 Double_t mD0PDG = TDatabasePDG::Instance()->GetParticle(421)->Mass();
129 if(PtProng(1) < cuts[3] || PtProng(0) < cuts[4]) okD0 = 0;
130 if(PtProng(0) < cuts[3] || PtProng(1) < cuts[4]) okD0bar = 0;
131 if(!okD0 && !okD0bar) return kFALSE;
133 if(TMath::Abs(Getd0Prong(1)) > cuts[5] ||
134 TMath::Abs(Getd0Prong(0)) > cuts[6]) okD0 = 0;
135 if(TMath::Abs(Getd0Prong(0)) > cuts[6] ||
136 TMath::Abs(Getd0Prong(1)) > cuts[5]) okD0bar = 0;
137 if(!okD0 && !okD0bar) return kFALSE;
139 if(GetDCA() > cuts[1]) { okD0 = okD0bar = 0; return kFALSE; }
141 InvMassD0(mD0,mD0bar);
142 if(TMath::Abs(mD0-mD0PDG) > cuts[0]) okD0 = 0;
143 if(TMath::Abs(mD0bar-mD0PDG) > cuts[0]) okD0bar = 0;
144 if(!okD0 && !okD0bar) return kFALSE;
146 CosThetaStarD0(ctsD0,ctsD0bar);
147 if(TMath::Abs(ctsD0) > cuts[2]) okD0 = 0;
148 if(TMath::Abs(ctsD0bar) > cuts[2]) okD0bar = 0;
149 if(!okD0 && !okD0bar) return kFALSE;
151 if(Prodd0d0() > cuts[7]) { okD0 = okD0bar = 0; return kFALSE; }
153 if(CosPointingAngle() < cuts[8]) { okD0 = okD0bar = 0; return kFALSE; }
157 //-----------------------------------------------------------------------------
158 Bool_t AliAODRecoDecayHF2Prong::SelectBtoJPSI(const Double_t *cuts,Int_t &okB)
161 // This function compares the Secondary JPSI candidates with a set of cuts:
163 // cuts[0] = inv. mass half width [GeV]
164 // cuts[1] = dca [cm]
165 // cuts[2] = cosThetaStar (negative electron)
166 // cuts[3] = pTP [GeV/c]
167 // cuts[4] = pTN [GeV/c]
168 // cuts[5] = d0P [cm] upper limit!
169 // cuts[6] = d0N [cm] upper limit!
170 // cuts[7] = d0d0 [cm^2]
171 // cuts[8] = cosThetaPoint
173 // If the candidate doesn't pass the cuts it sets the weight to 0
176 Double_t mJPsi,ctsJPsi;
179 Double_t mJPSIPDG = TDatabasePDG::Instance()->GetParticle(443)->Mass();
181 if(PtProng(1) < cuts[3] || PtProng(0) < cuts[4]) okB = 0;
182 if(!okB) return kFALSE;
184 if(TMath::Abs(Getd0Prong(1)) > cuts[5] ||
185 TMath::Abs(Getd0Prong(0)) > cuts[6]) okB = 0;
186 if(!okB) return kFALSE;
188 if(GetDCA() > cuts[1]) { okB = 0; return kFALSE; }
190 mJPsi=InvMassJPSIee();
191 if(TMath::Abs(mJPsi-mJPSIPDG) > cuts[0]) okB = 0;
192 if(!okB) return kFALSE;
194 ctsJPsi=CosThetaStarJPSI();
195 if(TMath::Abs(ctsJPsi) > cuts[2]) okB = 0;
196 if(!okB) return kFALSE;
198 if(Prodd0d0() > cuts[7]) { okB = 0; return kFALSE; }
200 if(CosPointingAngle() < cuts[8]) { okB = 0; return kFALSE; }
204 //-----------------------------------------------------------------------------