1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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8 * documentation strictly for non-commercial purposes is hereby granted *
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12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 /////////////////////////////////////////////////////////////
18 // Class for AOD reconstructed heavy-flavour cascades
20 // Author: X-M. Zhang, zhangxm@iopp.ccnu.edu.cn
21 /////////////////////////////////////////////////////////////
24 #include <TDatabasePDG.h>
25 #include <TClonesArray.h>
26 #include "AliAODMCParticle.h"
27 #include "AliAODRecoDecay.h"
28 #include "AliAODVertex.h"
29 #include "AliAODRecoDecayHF2Prong.h"
30 #include "AliAODRecoCascadeHF.h"
32 ClassImp(AliAODRecoCascadeHF)
33 //-----------------------------------------------------------------------------
35 AliAODRecoCascadeHF::AliAODRecoCascadeHF() :
36 AliAODRecoDecayHF2Prong()
39 // Default Constructor
42 //-----------------------------------------------------------------------------
43 AliAODRecoCascadeHF::AliAODRecoCascadeHF(AliAODVertex *vtx2, Short_t charge,
44 Double_t *px, Double_t *py, Double_t *pz,
45 Double_t *d0, Double_t *d0err, Double_t dca) :
46 AliAODRecoDecayHF2Prong(vtx2, px, py, pz, d0, d0err, dca)
49 // Constructor with AliAODVertex for decay vertex
53 //-----------------------------------------------------------------------------
54 AliAODRecoCascadeHF::AliAODRecoCascadeHF(AliAODVertex *vtx2, Short_t charge,
55 Double_t *d0, Double_t *d0err, Double_t dca) :
56 AliAODRecoDecayHF2Prong(vtx2, d0, d0err, dca)
59 // Constructor with decay vertex and without prongs momenta
63 //-----------------------------------------------------------------------------
64 AliAODRecoCascadeHF::AliAODRecoCascadeHF(const AliAODRecoCascadeHF &source) :
65 AliAODRecoDecayHF2Prong(source)
71 //-----------------------------------------------------------------------------
72 AliAODRecoCascadeHF &AliAODRecoCascadeHF::operator=(const AliAODRecoCascadeHF &source)
75 // assignment operator
77 if(&source == this) return *this;
79 AliAODRecoDecayHF2Prong::operator=(source);
83 //-----------------------------------------------------------------------------
84 AliAODRecoCascadeHF::~AliAODRecoCascadeHF()
90 //-----------------------------------------------------------------------------
91 Double_t AliAODRecoCascadeHF::InvMassDstarKpipi() const
94 // 3 prong invariant mass of the D0 daughters and the soft pion
97 Double_t px[3],py[3],pz[3];
98 UInt_t pdg[3]={321,211,211};
99 pdg[0] = (Charge()>0 ? 211 : 321); // positive daughter of D0
100 px[0] = Get2Prong()->PxProng(0);
101 py[0] = Get2Prong()->PyProng(0);
102 pz[0] = Get2Prong()->PzProng(0);
103 pdg[1] = (Charge()>0 ? 321 : 211); // negative daughter of D0
104 px[1] = Get2Prong()->PxProng(1);
105 py[1] = Get2Prong()->PyProng(1);
106 pz[1] = Get2Prong()->PzProng(1);
107 pdg[2] = 211; // soft pion
111 Short_t dummycharge=0;
112 Double_t dummyd0[3]={0,0,0};
113 AliAODRecoDecay *rd = new AliAODRecoDecay(0x0,3,dummycharge,px,py,pz,dummyd0);
115 Double_t minv = rd->InvMass(3,pdg);
121 //----------------------------------------------------------------------------
122 Int_t AliAODRecoCascadeHF::MatchToMC(Int_t pdgabs,Int_t pdgabs2prong,
123 Int_t *pdgDg,Int_t *pdgDg2prong,
124 TClonesArray *mcArray) const
127 // Check if this candidate is matched to a MC signal
129 // If yes, return label (>=0) of the AliAODMCParticle
132 Int_t ndg=GetNDaughters();
134 AliError("No daughters available");
138 AliAODRecoDecayHF2Prong *the2Prong = Get2Prong();
139 Int_t lab2Prong = the2Prong->MatchToMC(pdgabs2prong,mcArray,2,pdgDg2prong);
141 if(lab2Prong<0) return -1;
145 // loop on daughters and write labels
146 for(Int_t i=0; i<ndg; i++) {
147 AliVTrack *trk = (AliVTrack*)GetDaughter(i);
148 Int_t lab = trk->GetLabel();
149 if(lab==-1) { // this daughter is the 2prong
152 printf("daughter with negative label\n");
158 return AliAODRecoDecay::MatchToMC(pdgabs,mcArray,dgLabels,2,2,pdgDg);
160 //-----------------------------------------------------------------------------
161 Bool_t AliAODRecoCascadeHF::SelectDstar(const Double_t *cutsDstar,
162 const Double_t *cutsD0,
166 // cutsDstar[0] = inv. mass half width of D* [GeV]
167 // cutsDstar[1] = half width of (M_Kpipi-M_D0) [GeV]
168 // cutsDstar[2] = PtMin of pi_s [GeV/c]
169 // cutsDstar[3] = PtMax of pi_s [GeV/c]
170 // cutsDstar[4] = theta, angle between the pi_s and decay plane of the D0 [rad]
172 // cutsD0[0] = inv. mass half width [GeV]
173 // cutsD0[1] = dca [cm]
174 // cutsD0[2] = cosThetaStar
175 // cutsD0[3] = pTK [GeV/c]
176 // cutsD0[4] = pTPi [GeV/c]
177 // cutsD0[5] = d0K [cm] upper limit!
178 // cutsD0[6] = d0Pi [cm] upper limit!
179 // cutsD0[7] = d0d0 [cm^2]
180 // cutsD0[8] = cosThetaPoint
183 // check that the D0 passes the cuts
184 // (if we have a D*+, it has to pass as D0,
185 // if we have a D*-, it has to pass as D0bar)
188 Int_t okD0=0,okD0bar=0;
189 Get2Prong()->SelectD0(cutsD0,okD0,okD0bar);
190 if((Charge()==+1 && !okD0) || (Charge()==-1 && !okD0bar)) return kFALSE;
193 if( (PtProng(0)<cutsDstar[2]) || (PtProng(0)>cutsDstar[3]) ) return kFALSE;
195 Double_t mDstar = TDatabasePDG::Instance()->GetParticle(413)->Mass();
196 Double_t invmDstar = InvMassDstarKpipi();
197 if(TMath::Abs(mDstar-invmDstar)>cutsDstar[0]) return kFALSE;
199 Double_t mD0 = TDatabasePDG::Instance()->GetParticle(421)->Mass();
200 if(TMath::Abs((mDstar-mD0)-DeltaInvMass())>cutsDstar[1]) return kFALSE;
202 Double_t theta = AngleD0dkpPisoft();
203 if(theta>cutsDstar[4]) return kFALSE;
207 //-----------------------------------------------------------------------------
208 Bool_t AliAODRecoCascadeHF::SelectLctoV0(const Double_t *cutsLctoV0,
209 Bool_t okLck0sp, Bool_t okLcLpi) const
211 // cuts on Lambdac candidates to V0+bachelor
212 // (to be passed to AliAODRecoDecayHF3Prong::SelectLctoV0())
213 // 0 = inv. mass half width in K0s hypothesis [GeV]
214 // 1 = inv. mass half width in Lambda hypothesis [GeV]
215 // 2 = inv. mass V0 in K0s hypothesis half width [GeV]
216 // 3 = inv. mass V0 in Lambda hypothesis half width [GeV]
217 // 4 = pT min Bachelor track [GeV/c]
218 // 5 = pT min V0-Positive track [GeV/c]
219 // 6 = pT min V0-Negative track [GeV/c]
220 // 7 = dca cut on the V0 (cm)
221 // 8 = dca cut on the cascade (cm)
223 // if ( !Getv0() || !Getv0PositiveTrack() || !Getv0NegativeTrack() )
224 // { AliInfo(Form("Not adapted for ESDv0s, return true...")); return false; }
226 Double_t mLck0sp,mLcLpi;
227 okLck0sp=1; okLcLpi=1;
229 Double_t mLcPDG = TDatabasePDG::Instance()->GetParticle(4122)->Mass();
230 Double_t mk0sPDG = TDatabasePDG::Instance()->GetParticle(310)->Mass();
231 Double_t mLPDG = TDatabasePDG::Instance()->GetParticle(3122)->Mass();
234 double mk0s = Getv0()->MassK0Short();
235 mLck0sp = InvMassLctoK0sP();
238 double mlambda = Getv0()->MassLambda();
239 double malambda = Getv0()->MassAntiLambda();
240 mLcLpi = InvMassLctoLambdaPi();
243 // with k0s p hypothesis
244 if(TMath::Abs(mLck0sp-mLcPDG)>cutsLctoV0[0]) okLck0sp = 0;
245 // with Lambda pi hypothesis
246 if(TMath::Abs(mLcLpi-mLcPDG)>cutsLctoV0[1]) okLcLpi = 0;
248 // cuts on the v0 mass
249 if(TMath::Abs(mk0s-mk0sPDG)>cutsLctoV0[2]) okLck0sp = 0;
250 if( TMath::Abs(mlambda-mLPDG)>cutsLctoV0[3] &&
251 TMath::Abs(malambda-mLPDG)>cutsLctoV0[3] ) okLcLpi = 0;
253 if(!okLck0sp && !okLcLpi) return 0;
255 // cuts on the minimum pt of the tracks
256 if(TMath::Abs(GetBachelor()->Pt()) < cutsLctoV0[4]) return 0;
257 if(TMath::Abs(Getv0PositiveTrack()->Pt()) < cutsLctoV0[5]) return 0;
258 if(TMath::Abs(Getv0NegativeTrack()->Pt()) < cutsLctoV0[6]) return 0;
261 if(TMath::Abs(Getv0()->DcaV0Daughters()) > cutsLctoV0[7]) return 0;
263 // cut on the cascade dca
264 if( TMath::Abs(GetDCA(0))>cutsLctoV0[8] ||
265 TMath::Abs(Getv0()->DcaPosToPrimVertex())>cutsLctoV0[8] ||
266 TMath::Abs(Getv0()->DcaNegToPrimVertex())>cutsLctoV0[8] ) return 0;
271 //-----------------------------------------------------------------------------
272 Double_t AliAODRecoCascadeHF::AngleD0dkpPisoft() const {
274 // Angle of soft pion to D0 decay plane
277 TVector3 p3Trk0(Get2Prong()->PxProng(0),Get2Prong()->PyProng(0),Get2Prong()->PzProng(0)); // from D0
278 TVector3 p3Trk1(Get2Prong()->PxProng(1),Get2Prong()->PyProng(1),Get2Prong()->PzProng(1)); // from D0
279 TVector3 p3Trk2(PxProng(0),PyProng(0),PzProng(0)); // pi_s
281 TVector3 perp = p3Trk0.Cross(p3Trk1);
282 Double_t theta = p3Trk2.Angle(perp);
283 if(theta>(TMath::Pi()-theta)) theta = TMath::Pi() - theta;
284 theta = TMath::Pi()/2. - theta;